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  • jQuery/JavaScript Date form validation

    - by Victor Jackson
    I am using the jQuery date picker calendar in a form. Once submitted the form passes params along via the url to a third party site. Everything works fine, except for one thing. If the value inserted into the date field by the datepicker calendar is subsequently deleted, or if the default date, that is in the form on page load, is deleted and the form is submitted I get the following error: "Conversion from string "" to type 'Date' is not valid." The solution to my problem is really simple, I want to validate the text field where the date is submitted and send out a default date (current date) if the field is empty for any reason. The problem is I am terrible at Javascript and cannot figure out how to do this. Here is the form code for my date field. [var('default_date' = date)] <input type="text" id="datepicker" name="txtdate" value="[$default_date]" onfocus="if (this.value == '[$default_date]') this.value = '';" onchange="form.BeginDate.value = this.value; form.EndDate.value = this.value;" /> <input type="hidden" name="BeginDate" value="[$default_date]"/> <input type="hidden" name="EndDate" value="[$default_date]"/>

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  • How to get all Div within a table using javascript

    - by Rajesh Rolen- DotNet Developer
    please tell me how can i get array of all Those DIV of specific table whose LANG="1" using javascript table structure is like this: < table > < tr > < td > < div id=1 lang="1" > some metter < /div > < /td >< /tr > < tr > < td > < div id=2 lang="2" > some metter < /div > < /td >< /tr > < tr > < td > < div id=3 lang="1" > some metter < /div > < /td >< /tr > < tr > < td > < div id=4 lang="1" > some metter < /div > < /td >< /tr > < /table >

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  • javascript to select text from web page

    - by phil swenson
    I'm trying to write a bookmarklet that grabs any selected text on a web page and sends it to my website. It should (hopefully) work in Chrome, FFX, Safari, and IE. I did a search and found a function, but it doesn't appear to work. Here is the code: <html> <body> <div onClick=getSelText()>Click</div> <div>please select me</div> </body> <script language=javascript> function getSelText(){ var txt = 'nothing'; if (window.getSelection){ txt = "1" + window.getSelection(); } else if (document.getSelection) { txt = "2" + document.getSelection(); } else if (document.selection) { txt = "3" + document.selection.createRange().text; } else return; alert("selected text = " + txt); } </script> </html> when I select the text in the div "please select me" and hit the click div, I just get "selected text = 1" thanks

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  • http authentication fails in cucumber when adding @javascript tag

    - by JESii
    I have a feature in my Rials app that works just fine with the message "Responds to browser_basic_authorize" from the Background Given step. However, if I add a @javascript tag before the scenario, then my Background Given fails with "I don't know how to login". What's going wrong and how do I go about testing javascrpt interactions on my app? Background: Given I perform HTTP authentication as "<id>/<password>" When I go to the homepage Then I should see "Text-that-you-should-see-on-your-home-page" Scenario: Displaying injury causative factors Given I am on the new_incident_report page When I choose "incident_report_employee_following_procedures_true" Then I should see "Equipment failure?" Then I should not see "Lack of training" When /^I perform HTTP authentication as "([^\"]*)\/([^\"]*)"$/ do |username, password| puts "id/pswd: #{username}/#{password}" ### Following works ONLY if performed first before even going to a page!!! if page.driver.respond_to?(:basic_auth) puts 'Responds to basic_auth' page.driver.basic_auth(username, password) elsif page.driver.respond_to?(:basic_authorize) puts 'Responds to basic_authorize' page.driver.basic_authorize(username, password) elsif page.driver.respond_to?(:browser) && page.driver.browser.respond_to?(:basic_authorize) puts 'Responds to browser_basic_authorize' page.driver.browser.basic_authorize(username, password) else raise "I don't know how to log in!" end end Rails 3.0.9, current gems, other tests passing.

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  • read xml in javascript problem

    - by Najmi
    hai all, i have a problem with my code to read the xml.I have use ajax to read xml data and populate it in combobox. My problem is it only read the first data.Here is my code my xml like this <area> <code>1</code> <name>area1</name> </area> <area> <code>2</code> <name>area2</name> </area> and my javascript if(http.readyState == 4 && http.status == 200) { //get select elements var item = document.ProblemMaintenanceForm.elements["probArea"]; //empty combobox item.options.length = 0; //read xml data from action file var test = http.responseXML.getElementsByTagName("area"); alert(test.length); for ( var i=0; i < test.length; i++ ){ var tests = test[i]; item.options[item.options.length] = new Option(tests.getElementsByTagName("name")[i].childNodes[i].nodeValue,tests.getElementsByTagName("code")[i].childNodes[i].nodeValue); } }

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  • Can I get the IE debugger to break into long-running javascript

    - by Brian Deacon
    I have a page that has a byzantine amount of javascript running. In IE only, and only version 8, I get a long-script warning that I can reliably reproduce. I suspect it is event handlers triggering themselves in an infinite loop. The Developer Tools are limping horribly under the weight of the script running, but I do seem to be able to get the log to tell me what line of script it was executing when I aborted, but it is inevitably some of the deep plumbing of the ExtJS code we use, and I can't tell where it is in my stack of code. A way of seeing the call stack would work, but preferably I'd like to be able to just break into the debugger when I get the long script warning so I can just step through the stack. There is a similar question posted, but the answers given were for a not-the-right-tool, or the not terribly helpful advice to eliminate half my code at a time on a binary hunt for the infinite loop. If my code were simple enough that I could do that, it probably wouldn't have gotten the infinite loop in the first place. If I could reproduce the problem in firebug, I'd probably be a lot happier too.

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  • Passing javascript object to webservice via Jquery ajax

    - by kralco626
    I have a webservice that returns an object [WebMethod] public List<User> ContractorApprovals() I also have a webservice that accepcts an object [WebMethod] public bool SaveContractor(Object u) When I make my webservice calls via Jquery: function ServiceCall(method, parameters, onSucess, onFailure) { var parms = "{" + (($.isArray(parameters)) ? parameters.join(',') : parameters) + "}"; // to json $.ajax({ type: "POST", url: "services/"+method, data: parms, contentType: "application/json; charset=utf-8", dataType: "json", success: function(msg) { if (typeof onSucess == 'function' || typeof onSucess == 'object') onSucess(msg.d); }, error: function(msg, err) { $("#dialog-error").dialog('open');} }); I can call the first one just fine. My onSucess function gets passed a javascript object exactly structured like my User object on the service. However, I am now having trouble getting the object back to the server. I'm accepting Object as a parameter on the server side so I can't inagine there is an issue there. So I'm thinking something is wrong with the parms on the client side but i'm not sure what... I am doing something to the effect ServiceCall("AuthorizationManagerWorkManagement.asmx/ContractorApprovals", "", function(data,args){$("#div").data('user',data[0])}, null) then ServiceCall("AuthorizationManagerWorkManagement.asmx/SaveContractor", $("#div").data('user'), //These also do not work: "{'u': ' + $("#div").data("user") + '}", NOR JSON.stringify({u: userObject}) function(data,args){(alert(data)}, null) I know the first service call works, I can get the data. The second one is causing the "onFailure" method to execute rather then "OnSuccess". Any ideas?

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  • Javascript: Change li class if checkbox is selected (on load)

    - by BoDiE2003
    I have this code on javascript side: function changeSelectionStyle(id) { if(document.getElementById(id).className != 'yes'){ document.getElementById(id).className = 'yes'; } else{document.getElementById(id).className = '';} } And this on html: <ul> <li id="selectedAuthorities-4_1li" class=""> <input type="checkbox" id="selectedAuthorities-4_1" name="selectedAuthorities" value="ROLE_ADD_COMMENT_TO_CV" checked="checked" onload="changeSelectionStyle(this.id + 'li');" onclick="changeSelectionStyle(this.id + 'li'); checkFatherSelection(this.id);"> <a href="#" onclick="document.getElementById('selectedAuthorities-4_1').click(); return false;"> Agregar comentario <samp><b></b>Permite agregar comentario en el detalle.</samp> </a> </li> </ul> Well what I cant get work is when the checkbox is selected, on load, the JS should check it, and assign class="yes" to the li, here: <li id="selectedAuthorities-4_1li" class=""> Any suggestions? Thank you

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  • javascript read a text file

    - by Cyprus106
    I have looked everywhere and surprisingly can't find a good solution to this! I've got the following code that is supposed to read a text file and display it's contents. But it's not reading, for some reason. Am I doing something wrong? FTR, I can't use PHP for this. It's gotta be Javascript. var txtFile = new XMLHttpRequest(); txtFile.open("GET", "http://www.mysite.com/todaysTrivia.txt", true); txtFile.send(null); txtFile.onreadystatechange = function() { if (txtFile.readyState == 4) { // Makes sure the document is ready to parse. alert(txtFile.responseText+" - "+txtFile.status); //if (txtFile.status === 200) { // Makes sure it's found the file. var doc = document.getElementById("Trivia-Widget"); if (doc) { doc.innerHTML = txtFile.responseText ; } //} } txtFile.send(null); } Any good ideas what I'm doing wrong? It just keeps givimg me a zero status.

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  • Why doesn't this external JavaScript load?

    - by Ben Herila
    I've been futzing with this for hours trying to figure out why codemirror.js won't load in any browser other than Firefox. Any ideas? index.html <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en"> <head> <title></title> <script src="CodeMirror/js/codemirror.js"></script> <link href="Styles/Style.css" rel="stylesheet" type="text/css" /> <link href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/themes/base/jquery-ui.css" rel="stylesheet" type="text/css" /> <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4/jquery.min.js"></script> <script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/jquery-ui.min.js"></script> <script type="text/javascript"> $(document).ready(function () { $('#container-1').tabs(); }); </script> <style type="text/css"> /* (some css) */ </style> </head><body> <!-- (some stuff) --> </body></html> CodeMirror/js/codemirror.js alert("LOL");

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  • javascript countdown timer with cookies

    - by jwesonga
    I have a countdown timer that will show a target amount to be fundraised like USD1000000 and slowly count backwards to zero over a period of days. I got this snippet: $(function() { var cnt = 75000000; var count = setInterval(function() { if (cnt > 0) { $('#target').html("<span>KSHS</span><strong>" + cnt + " Target </strong>"); cnt--; } else { clearInterval(count); $('#target').html("<strong> Target Achieved! </strong>"); } }, 4000); }); The only problem is that everytime you refresh the page the counter starts again which essentially means it will never end. I'd like it that a when a user revisits/refreshes the page the counter persists and continues. I've read that javascript cookies can be used for this, just don't know how to implement them, any help?

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  • How does scope in Javascript work?

    - by Jim
    I can not understand how scoping works in Javascript. E.g. <html> <head> <script>var userName = "George"; </script> </head> <body> ...... <script> document.write('Name = ' + userName); </script> </body> </html> The variable userName is declared in another "section" of a script. As I understand it the browser renders html and executes code in the order it finds it. So how does userName in the second script tag gets resolved? Does it go to a global setting? Anything I declare earlier is global? I noticed the same happens if I do something like: <html> <head> <script> do { var userName = "George"; //bla } while (someCondition); </script> </head> <body> ...... <script> document.write('Name = ' + userName); </script> </body> </html> Even when userName is declared inside {} it is still resolved in the second script. How is that possible?

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  • Creating a dynamic two-column iOS spinning wheel with HTML/Javascript

    - by JSW189
    I am trying to create a dynamic two-column spinning wheel for iOS Safari using this HTML/Javascript wheel. However, I am having trouble getting the value of the first column to change the results of the second column. I have tried using an if statement to get the value of the first variable (var beverage) and add the value of the second column correspondingly. Does anybody know what I am doing wrong/if there is a better approach? function openBirthDate() { var beverage = { 1:'Coffee', 2:'Soda' }; //THIS IS WHERE I'M HAVING TROUBLE var results = SpinningWheel.getSelectedValues(); if (results.values === 1) { var company = { 1:'Starbucks', 2:'Dunkin Donuts' }; } else { var company = { 1:'Coke', 2:'Pepsi' }; } var size = { 1:'Tall', 2:'Grande', 3:'Venti' }; SpinningWheel.addSlot(type, '', 1); SpinningWheel.addSlot(company, '', 1); SpinningWheel.addSlot(size, '', 1); SpinningWheel.setCancelAction(cancel); SpinningWheel.setDoneAction(done); SpinningWheel.open(); } function done() { var results = SpinningWheel.getSelectedValues(); document.getElementById('result').innerHTML = 'values: ' + results.values.join(' ') + '<br />keys: ' + results.keys.join(', '); } function cancel() { document.getElementById('result').innerHTML = 'cancelled!'; } window.addEventListener('load', function(){ setTimeout(function(){ window.scrollTo(0,0); }, 100); }, true);

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  • Javascript storing properties and functions in variables

    - by richard
    Hello, I'm having trouble with my programming style and I hope to get some feedback here. I recently bought Javascript: The Good Parts and while I find this a big help, I'm still having trouble designing this application. Especially when it comes to writing function and methods. Example: I have a function that let's the user switches games in my app. This function updates game-specific information in the current view. var games = { active: Titanium.App.Properties.getString('active_game'), gameswitcher_positions: { 'Game 1': 0, 'Game 2': 1, 'Game 3': 2, 'Game 4': 3, 'Game 5': 4 }, change: function(game) { if (active_game !== game) { gameswitcher.children[this.gameswitcher_positions[this.active]].backgroundImage = gameswitcher.children[this.gameswitcher_positions[this.active]].backgroundImage.replace('_selected', ''); gameswitcher.children[this.gameswitcher_positions[game]].backgroundImage = gameswitcher.children[this.gameswitcher_positions[game]].backgroundImage.replace('.png', '_selected.png'); events.update(game); this.active = game; } }, init: function() { gameswitcher.children[this.gameswitcher_positions[this.active]].backgroundImage = gameswitcher.children[this.gameswitcher_positions[this.active]].backgroundImage.replace('.png', '_selected.png'); events.update(this.active); } }; gameswitcher is a container view which contains buttons to switch games. I am not satisfied with this approach but I cannot think of a better one. Should I place the gameswitcher_positions outside of the variable in a seperate variable instead of as a property? And what about the active game? Please give me feedback, what am I doing wrong?

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  • Control Javascript > CSS through Flash

    - by Jason b.
    Hi All, Ideal situation/setup: A page containing 1 Flash movie and a separate div containing a few hyperlinks. These hyperlinks each have a unique class name like so: Copy code <ul> <li><a href="" class="randomname1"></a></li> <li><a href="" class="randomname2"></a></li> <li><a href="" class="randomname3"></a></li> <li><a href="" class="randomname4"></a></li> </ul> The Flash movie itself will contain 4 buttons. Clicking on one of these buttons should make the Flash communicate with Jquery/JS and tell it to highlight the specific classname. Ideas so far For the javascript, it would look like $(function() { function setClass(className) {$("."+className).css("background","red");} }); And in specific keyframes within Flash 1. button 1 ExternalInterface.call("setClass","randomname1"); 1. button 2 ExternalInterface.call("setClass","randomname2"); 1. button 3 ExternalInterface.call("setClass","randomname3"); 1. button 4 ExternalInterface.call("setClass","randomname4"); The problem is that it is not really working well and i am not sure if i am making Flash communicate with JS properly. Any ideas or hints to steer me in the right direction again? Thank you in advance J.

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  • Reading JSON with Javascript/jQuery

    - by Josephine
    I'm building a game in javascript/html5 and I'm trying to build a database of locked doors in a maze that can be loaded from and overwritten to throughout gameplay. I've found a large number of tutorials online, but nothing is working. I was wondering if someone could look at what I'm trying and let me know what I'm doing wrong. My JSON file looks like this: { "doors": [ {"left":true, "right":false, "bottom":false}, {"left":false, "right":false, "bottom":false}, {"right":false, "bottom":false, "top":false}, {"left":false, "right":false, "top":false} ] } I want to build the HTML page so that when a player collides with a door it checks if its locked or not like: if (player.x < leftDoor.x + leftDoor.width && player.x + player.width > leftDoor.x && player.y < leftDoor.y + leftDoor.height && player.y + player.height > leftDoor.y) { if(doors[0].left == true) alert("door is locked"); else window.location = ( "2.html?p1="); } However I'm having trouble reading from the JSON file itself. I've tried things like: function loadJson() { $(document).ready(function() { $.getJSON('info.json', function(doors) { alert(doors[0].left); }); }); } But nothing happens, and I need to be able to access the information in the HTML as well. I'd rather use jQuery, but I'm not opposed to straight JS if it works. I've been trying to do this for ages and I'm getting absolutely no where. If someone could help that would be amazing. Thanks!

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  • Splitting data from MySQL using PHP & Javascript works in IE but not in FF

    - by MTSzabo
    I have the following JavaScript function on a page: function setFields(){ var menu = document.getElementById('EditLocation'); var itemDataArray = menu[menu.selectedIndex].value.split('|'); form.LocationShortName.value = itemDataArray[0]; form.LocationLongName.value = itemDataArray[1]; form.Phone.value = itemDataArray[2]; form.Address1.value = itemDataArray[3]; form.CityStateZip.value = itemDataArray[4]; form.MapLink.value = itemDataArray[5]; } Down on the Form, I have the following: <select class="input2" name="EditLocation" id="EditLocation" onchange = "setFields();"> <option value="-Add New-"<?php if($editlocation=='-Add New-'){echo(' selected="selected"');} ?>>-Add New-</option> <?php require_once('connection.php'); $connection = mysql_connect($hostname,$username,$password) or die (mysql_errno().": ".mysql_error()."<BR />"); mysql_select_db($database); $sql = "SELECT * FROM directions ORDER BY dirshortname"; $query = mysql_query($sql); while ($row = mysql_fetch_array($query)) { echo('<option value="'.stripslashes($row['dirshortname']).'|'.stripslashes($row['dirlongname']).'|'.stripslashes($row['dirphone']).'|'.stripslashes($row['dirstreet']).'|'.stripslashes($row['dircsz']).'|'.stripslashes($row['dirmaplink']).'"'); if ($editlocation==stripslashes($row['dirshortname'])) { echo(' selected="selected"'); } echo('>'.stripslashes($row['dirshortname']).'</option>'); } ?> In essence, the PHP is supposed to pack the data elements pulled from MySQL into the OPTION VALUE portion of the SELECT box. Once the user selects a record, the JavaScript pulls the packed data apart and populates the other data elements on the FORM. It all works wonderfully in IE, but in FF the fields do not populate with data. The form is somewhat long, but I'll include it anyway for the sake of completeness. <form action="admin-dirs.php" method="post" enctype="multipart/form-data" style="margin:0px; padding:0px " id="form"> <table width="587" border="0" cellspacing="0" cellpadding="0"> <tr> <td width="60">&nbsp;</td> <td width="185">Select Location to Edit: </td> <td width="342"><select class="input2" name="EditLocation" id="EditLocation" onchange = "setFields();"> <option value="-Add New-"<?php if($editlocation=='-Add New-'){echo(' selected="selected"');} ?>>-Add New-</option> <?php require_once('connection.php'); $connection = mysql_connect($hostname,$username,$password) or die (mysql_errno().": ".mysql_error()."<BR />"); mysql_select_db($database); $sql = "SELECT * FROM directions ORDER BY dirshortname"; $query = mysql_query($sql); while ($row = mysql_fetch_array($query)) { echo('<option value="'.stripslashes($row['dirshortname']).'|'.stripslashes($row['dirlongname']).'|'.stripslashes($row['dirphone']).'|'.stripslashes($row['dirstreet']).'|'.stripslashes($row['dircsz']).'|'.stripslashes($row['dirmaplink']).'"'); if ($editlocation==stripslashes($row['dirshortname'])) { echo(' selected="selected"'); } echo('>'.stripslashes($row['dirshortname']).'</option>'); } ?> </select></td> </tr> <tr> <td width="60">&nbsp;</td> <td colspan="2"><span class="main" style=" padding-left:12px; padding-right:12px; padding-top:6px"><br /> (Note: Leaving the Long Name blank will duplicate the Short Name.)</span></td> </tr> <?php if(!$errlocationshortname=='' ){echo(' <tr> <td width="60">&nbsp;</td> <td width="185">&nbsp;</td> <td width="342"><span class="redtxterror">'.$errlocationshortname.'</span></td> </tr>');} ?> <tr> <td>&nbsp;</td> <td>Location Short Name: <span class="red_star">*</span> </td> <td><input name="LocationShortName" id="LocationShortName" type="text" class="input2<?php if(!$errlocationshortname==''){echo('r');} ?>" value="<?php echo($locationshortname); ?>" maxlength="50"></td> </tr> <?php if(!$errlocationlongname=='' ){echo(' <tr> <td width="60">&nbsp;</td> <td width="185">&nbsp;</td> <td width="342"><span class="redtxterror">'.$errlocationlongname.'</span></td> </tr>');} ?> <tr> <td>&nbsp;</td> <td>Location Long Name: <span class="red_star">*</span> </td> <td><input name="LocationLongName" id="LocationLongName" type="text" class="input2<?php if(!$errlocationlongname==''){echo('r');} ?>" value="<?php echo($locationlongname); ?>" maxlength="50"></td> </tr> <?php if(!$erraddress=='' ){echo(' <tr> <td width="60">&nbsp;</td> <td width="185">&nbsp;</td> <td width="342"><span class="redtxterror">'.$erraddress.'</span></td> </tr>');} ?> <tr> <td>&nbsp;</td> <td>Street Address: <span class="red_star">*</span> </td> <td><input name="Address1" id="Address1" type="text" class="input2<?php if(!$erraddress==''){echo('r');} ?>" value="<?php echo($address); ?>"></td> </tr> <?php if(!$errcsz=='' ){echo(' <tr> <td width="60">&nbsp;</td> <td width="185">&nbsp;</td> <td width="342"><span class="redtxterror">'.$errcsz.'</span></td> </tr>');} ?> <tr> <td>&nbsp;</td> <td>City, State, Zip: <span class="red_star">*</span> </td> <td><input name="CityStateZip" id="CityStateZip" type="text" class="input2<?php if(!$errcsz==''){echo('r');} ?>" value="<?php echo($csz); ?>"></td> </tr> <?php if(!$errphone=='' ){echo(' <tr> <td width="60">&nbsp;</td> <td width="185">&nbsp;</td> <td width="342"><span class="redtxterror">'.$errphone.'</span></td> </tr>');} ?> <tr> <td>&nbsp;</td> <td>Location Phone Number: <span class="red_star">*</span> </td> <td><input name="Phone" id="Phone" type="text" class="input2<?php if(!$errphone==''){echo('r');} ?>" value="<?php echo($phone); ?>" maxlength="20"></td> </tr> <?php if(!$errmaplink=='' ){echo(' <tr> <td width="60">&nbsp;</td> <td width="185">&nbsp;</td> <td width="342"><span class="redtxterror">'.$errmaplink.'</span></td> </tr>');} ?> <tr> <td>&nbsp;</td> <td>Paste Link to Map: <span class="red_star">*</span> </td> <td><input name="MapLink" id="MapLink" type="text" class="input2<?php if(!$errmaplink==''){echo('r');} ?>" value="<?php echo($maplink); ?>" maxlength="125"></td> </tr> <tr> <td>&nbsp;</td> <td>&nbsp;</td> <td><div align="right" style="padding-right:25px"> <input type="hidden" id="action" name="action" value="submitform" /> <input type="submit" id="savenew" name="savenew" value="Save & New" /> <input type="submit" id="submit" name="submit" value="Save & Close" /> <?php if(!isset($_POST['action'])) {?> <input type="reset" id="reset" name="reset" value="Reset" /> <?php } ?> </div></td> </tr><tr> <td>&nbsp;</td> <td>&nbsp;</td> <td class="main_d"><div align="right" style="padding-right:25px">Your IP Address is Logged as: <?php echo($ip); ?></div></td> </tr> </table> </form>

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  • JavaScript: why `null == 0` is false?

    - by lemonedo
    I had to write a routine that increments the value of a variable by 1 if it is a number, or assigns 0 to the variable if it is not a number. The variable can be incremented by the expression, or be assigned null. No other write access to the variable is allowed. So, the variable can be in three states: it is 0, a positive integer, or null. My first implementation was: v >= 0 ? v += 1 : v = 0 (Yes, I admit that v === null ? v = 0 : v += 1 is the exact solution, but I wanted to be concise then.) It failed since null >= 0 is true. I was confused, since if a value is not a number, an numeric expression involving it must be false always. Then I found that null is like 0, since null + 1 == 1, 1 / null == Infinity, Math.pow(2.718281828, null) == 1, ... Strangely enough, however, null == 0 is evaluated to false. I guess null is the only value that makes the following expression false: (v == 0) === (v >= 0 && v <= 0) So why null is so special in JavaScript?

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  • Why use object.prototype.constructor in OOP javascript?

    - by Matt
    I've recently started reading up on OOP javascript and one thing that authors seem to skip over is when an object A has been declared and suddenly I see "A.prototype.constructor =A; For example, var A = function(){}; // This is the constructor of "A" A.prototype.constructor = A; A.prototype.value = 1; A.prototype.test = function() { alert(this.value); } var a = new A(); // create an instance of A alert(a.value); // => 1 So I run the command in firebug "var A = function(){};" and then "A.Constructor" Which reveals it's a function. I understand this. I run the code "A.prototype.constructor = A;" and I thought this changes the A constructor from Function to A. The constructor property of A has been changed right? Instead when I run "A.constructor" it gives me function () still. What's the point? I also see A.constructor.prototype.constructor.prototype.. what is going on?

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  • new Date() In javascript :: need Help

    - by gskoli
    Dear all, i am creating a digital clock using images & javascript but i want to pass a server time that time ... How to do that ... I am getting time from server and passing it to Date Following i have given snippet . var time_str = document.clock_form.time_str.value ; //alert (time_str); function dotime(){ theTime=setTimeout('dotime();',1000); //d = new Date(Date.parse(time_str)); d= new Date(time_str); hr= d.getHours()+100; mn= d.getMinutes()+100; se= d.getSeconds()+100; var time_str = document.clock_form.time_str.value ; //alert (time_str); alert(' TIME ---> '+hr+' :: '+mn+' :: '+ se); if(hr==100){ hr=112;am_pm='am'; } else if(hr<112){ am_pm='am'; } else if(hr==112){ am_pm='pm'; } else if(hr>112){ am_pm='pm';hr=(hr-12); } tot=''+hr+mn+se; document.hr1.src = '/flash_files/digits/dg'+tot.substring(1,2)+'.gif'; document.hr2.src = '/flash_files/digits/dg'+tot.substring(2,3)+'.gif'; document.mn1.src = '/flash_files/digits/dg'+tot.substring(4,5)+'.gif'; document.mn2.src = '/flash_files/digits/dg'+tot.substring(5,6)+'.gif'; document.se1.src = '/flash_files/digits/dg'+tot.substring(7,8)+'.gif'; document.se2.src = '/flash_files/digits/dg'+tot.substring(8,9)+'.gif'; document.ampm.src= '/flash_files/digits/dg'+am_pm+'.gif'; } dotime(); But it is not working Help me out Thanks in advance.

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  • Getting "prompt aborted by user" javascript exception

    - by Bhagwat
    I am getting "Components.Exception("prompt aborted by user", Cr.NS_ERROR_NOT_AVAILABLE)" exception when I am using "windows.location.href" in javasacript. My Code is: function checkCookie(){ var value = null; var cookieName='UserDetailsCookie'; value=ReadCookie(cookieName); if(value != null){ var url='<%=request.getContextPath()%>/jsp/admin.jsp'; window.location.href = url; } document.loginForm.userName.focus(); } function ReadCookie(name) { name += '='; var parts = document.cookie.split(/;\s*/); for (var i = 0; i < parts.length; i++) { var part = parts[i]; if (part.indexOf(name) == 0) return part.substring(name.length); } return null; } and I am calling this method on onLoad event of body <body onLoad="javascript:checkCookie();"> In anyone knows why this exception throws please?

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  • JavaScript onClick() Display

    - by junaidkaps
    I have an array consisting of several objects containing Strings. I am successfully able to display the array by using: <td><p onclick="theMiddle(this)">The Middle</td> As you see from the td tag this is part of a table. Issue is that the browser opens up a new page to display my text. I have been trying to display the array above my table in a p tag. //JavaScript var arrayTheMiddle = new Array (showName.theMiddle, beginingTime.theMiddle, network.abc, duration.thirty, rating.general, description.theMiddle, showImage.theMiddle); function theMiddle(obj){ for(i=0; i < arrayTheMiddle.length; i++) { document.write(arrayTheMiddle[i] + "<br>"); } } //HTML File <p>Would like the array/function displayed here while the user clicks within the table below (entire table has not been listed)</p> <td><p onclick="theMiddle(this)">The Middle</td> Unfortunately I am constantly failing at utilizing get element by id to call my function which consists of an array. I have searched for all sorts of stuff, yet frankly I'm lost. Not even sure if my approach is correct at this point. I'm sure this is one of those simple things that are blowing over my head!

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  • Div's visibility with javascript - problem

    - by sammville
    I am trying to use div's to display content on my page. This is controlled with an onchange element in a select menu. It works perfectly but the problem is I want one div to close when another one is opened. The div's open fine but it does not close the others. An example code is below. What am I doing wrong? JavaScript: if(document.getElementById('catgry').value == '01'){ document.getElementById('post04').style.visibility = "visible"; document.getElementById('post04').style.display = ""; document.getElementById('post07').style.visibility = "hidden"; document.getElementById('post07').style.display = "none"; }else if(document.getElementById('catgry').value == '02'){ document.getElementById('post02').style.visibility = "visible"; document.getElementById('post02').style.display = ""; document.getElementById('post04').style.visibility = "hidden"; document.getElementById('post04').style.display = "none"; document.getElementById('post07').style.visibility = "hidden"; document.getElementById('post07').style.display = "none"; } HTML: <div id="post04" style="visibility:hidden; display:none;"> <table class="posttb"><tr> <td width="30%">Author</td> <td><input type="text" name="author" size="30" class="postfd"></td> </tr> </table> </div>

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  • Javascript Instance Variable Syntax (AJAX page refresh)

    - by Rosarch
    I'm having difficulty with Javascript instance variables. I'm trying to make an easy way to refresh the chat page, looking for new messages. The AJAX call supplies a mid, or the lowest message id to be returned. This allows the call to only ask for the most recent messages, instead of all of them. MessageRefresher.prototype._latest_mid; function MessageRefresher(latest_mid) { this._latest_mid = latest_mid; // it thinks `this` refers to the MessageRefresher object } MessageRefresher.prototype.refresh = function () { refreshMessages(this._latest_mid); // it thinks `this` refers to the window this._latest_mid++; } function refreshMessages(latest_mid) { $.getJSON('API/read_messages', { room_id: $.getUrlVar('key'), mid: latest_mid }, function (messages) { for (var i = 0; i < messages[0].length; i++) { var newChild = sprintf("<li>%s: %s</li>", messages[1][i], messages[0][i]); $("#messages").append(newChild); } }); var messageRefresher = new MessageRefresher(0); setInterval(messageRefresher.refresh, 1000); This results in all the messages being printed out, over and over again. I know it has other bugs, but the main issue I'm trying to work out right now is the use of the instance variable. Or is there another way I should be going about doing this?

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  • Strange behavior with ajax call complete in JavaScript modules

    - by user2598794
    I have 3 simple modules with JavaScript code and JQuery ajax call. First module lots.js: var Lots = (function ($) { var self = this; var processIsRunning; return { getLots: function (lotsUrl) { var items = []; self.processIsRunning = true; var request = $.ajax({ url: lotsUrl, type: 'POST', success: function (data) { //some code } }); $.when(request).done(function() { //some code self.processIsRunning = false; }); }, isComplete: function () { return !self.processIsRunning; } }; }(jQuery)); Module bids.js: var Bids = (function ($) { return { makeBids: function (bidUrl) { //some code } }; }(jQuery)); Module app.js which bundles all together: var App = (function () { var lots_url = null; var bid_url = null; var self = this; return { if (!self.lots_url) { self.lots_url = lotsUrl; } GetLots: function (lotsUrl) { Lots.getLots(self.lots_url); }, MakeBids: function makeBid(bidUrl) { //some code var isComp = Lots.isComplete(); while (!isComp) { isComp = Lots.isComplete(); } Bids.makeBids(self.bid_url); } }; }()); But in the 'while' loop I always get 'isComplete=false'. In debug I see that 'processIsRunning' in Lots module is always true. What's the problem?

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