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  • Is there a way to jail in Javascript, so that the DOM isn't visible

    - by TiansHUo
    I would really like to provide the user some scripting capabilities, while not giving it access to the more powerful features, like altering the DOM. That is, all input/output is tunneled thru a given interface. Like a kind of restricted javacsript. Example: If the interface is checkanswer(func) this are allowed: checkanswer( function (x,y)={ return x+y; } but these are not allowed: alert(1) document.write("hello world") eval("alert()")

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  • Javascript date comparison

    - by Art
    Why does equality operator return false in the first case? var a = new Date(2010, 10, 10); var b = new Date(2010, 10, 10); alert(a == b); // <- returns false alert(a.getTime() == b.getTime()); // returns true Why?

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  • having problems with javascript null

    - by user165242
    I have tried rectifying the code below. But I am not able to find a solution. After executing the code, firebug says "document.getElementById(haystack.value) is null". I tried if(document.getElementById(haystack).value ==null) but it was of no use. Please help me out. var haystack=document.getElementById('city1').value; if(!document.getElementById(haystack).value) { alert("null"); } else { alert("not null"); }

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  • What is wrong with this javascript?

    - by bala3569
    i use this javascript syntax for validating a checkbox... alert(document.getElementById("ctl00_ContentPlaceHolder1_Chkreg").checked); if (document.getElementById("ctl00_ContentPlaceHolder1_Chkreg").checked == false) { document.getElementById("ctl00_ContentPlaceHolder1_ErrorMsg").innerHTML = "please select the checkbox"; document.getElementById("ctl00_ContentPlaceHolder1_Chkreg").focus(); return false; } My alert showed me false but my if loop is not working... Any suggestion...

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  • JavaScript Coding for Finding Shipping Total

    - by user2913279
    I am having a very hard time with this code. I have been working on it for days and cannot seem to figure it out. Please help!! Here are the specific I need for the code: Many companies normally charge a shipping and handling charge for purchases. Create a Web page that allows a user to enter a purchase price into a text box and includes a JavaScript function that calculates shipping and handling. Add functionality to the script that adds a minimum shipping and handling charge of $1.50 for any purchase that is less than or equal to $25.00. For any orders over $25.00, add 10% to the total purchase price for shipping and handling, but do not include the $1.50 minimum shipping and handling charge. The formula for calculating a percentage is price * percent / 100. For example, the formula for calculating 10% of a $50.00 purchase price is 50 * 10 / 100, which results in a shipping and handling charge of $5.00. After you determine the total cost of the order (purchase plus shipping and handling), display it in an alert dialog box. Here is the code I have: <!DOCTYPE> <head> <title>Calculate Shipping</title> <script type="text/javascript"> function parseInt() { var salesPrice = document.salesForm.Price.value; var minCharge = salesPrice + 1.50; var shipping = salesPrice * 10/100; if (salesPrice <= 25) window.alert('Your sales total including shipping is $' + minCharge); else window.alert('Your sales total including shipping is $' + salesPrice + shipping); } </script> </head> <body> <form name="salesForm"> <div > <p>Enter Your Purchase Price</p> <input type="text" name="Price" /><br /><br /> <input type="button" name="Calculate" value="Calculate Shipping" onclick="parseInt ()" /> </div> </form> </body> </html> Everything works except for the math in the alert box. It will show an incorrect total...

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  • Javascript setFullYear

    - by user187870
    var currentDate=new Date(); currentDate.setFullYear(2011); alert(currentDate); == this works, it sets the year to 2011 as expected. alert((new Date()).setFullYear(2011)); == this one doesn't work. Any idea why? Am I misunderstanding the syntax?

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  • Make get function Sycronous / Javascript

    - by DDL449
    I'm experiencing a problem of $.get function. The url contains JSON this is my code: xyz = null $.get('http://www.someurl.com/123=json', function(data) { var xyz = data.positions[0].latitude; }); alert(xyz); //some more code using xyz variable I know that xyz will alert a null result because the $.get is asychronous. So is there any way I can use the xyz outside this get function? Thank you

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  • VB6: assign javascript function to a dom element

    - by Fuxi
    hi, i'm using the mshtml library for parsing out html via MSHTML.HTMLDocument. my question: is there a way to assign a javascript function to a dom element? i've tried something like: div.onmouseover = "function(){alert('mouseover')}" and div.setattribute "onmouseover" , "function(){alert('mouseover')}" without success (no error but no effect either). anyone knows if its possible? thx

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  • Loop through Javascript array, print with string.

    - by Adam
    I have a simple array like: var myArr=["one","two","three"]; an I have a counting loop, which increases the value of var "i" by one. What I want to do is print the next value from the array each time the loop runs, next to a text string, like so: alert('value number '+myArr[i]+); But for some reason I can't get this to work. The following code works, so I'm assuming I'm not calling the counter right: alert('value number '+myArr[0]+);

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  • javascript htmlDivElement problem

    - by Fearghal
    Hi guys, I have a htmlDivElement (with no id) - and I'm trying to access and change the style of it.. Problem is everything I try returns 'Undefined' when i try to alert it Eg: alert (htmldivelementobject.className) I've also tried getAttribute but it returns the same thing... Where am I going wrong? F

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  • Any way to pass parameters programmatically to an onclick function?

    - by RenderIn
    I have an onclick function which performs several tasks. In another javascript function I do not have access to the context variables needed to perform these tasks. To get around this I have been simply calling the onclick function directly. The problem I have now is that I'd like to perform a task after an Ajax action in the onclick completes. Is there any way for me to pass a function to the onclick method of a link? What would the onclick attribute look like? e.g. something like this: <a id="link3" href="javascript:void(0);" onclick="function(callback) { X(a); Y(b); Z(c, callback); };">click me</a> Clicking on this would pass "undefined" as the callback, while I could also call it explicitly like this: document.getElementById("link3").onclick(function() { alert("Completed all tasks"); } ); Is something like this possible? Basically I want to be able to pass an optional parameter to the onclick method, but if it's absent I want it to behave as if there were just procedural code in the onclick.

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  • Observing events on injected elements using prototype

    - by snaken
    I asked a question previously, it was answered correctly in the form i asked it but realised now why it wasnt working for me. i have this code to observe multiple select menus: $('product_options').select('select').invoke("observe","change",optchange); This does work - as pointed out - with static layout like this: <html> <head> <title>optchange</title> <script type="text/javascript" src="prototype.js"></script> </head> <body> <div id="product_options"> <select id="o0"> <option>1</option> <option>2</option> </select> <select id="o1"> <option>1</option> <option>2</option> </select> <select id="o3"> <option>1</option> <option>2</option> </select> </div> <script type="text/javascript"> function optchange(e) { alert("optchanged"); } $('product_options').select('select').invoke("observe","change", optchange); </script> </body> </html> But in my context, making a selection in the first select menu fires of an Ajax.Updater that completely replaces the content of Select 2 - this is killing the event observer. Is there a way to fix this without having to apply a new event observer each time? Thanks.

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  • Is there any reason not to go directly from client-side Javascript to a database?

    - by Chris Smith
    So, let's say I'm going to build a Stack Exchange clone and I decide to use something like CouchDB as my backend store. If I use their built-in authentication and database-level authorization, is there any reason not to allow the client-side Javascript to write directly to the publicly available CouchDB server? Since this is basically a CRUD application and the business logic consists of "Only the author can edit their post" I don't see much of a need to have a layer between the client-side stuff and the database. I would simply use validation on the CouchDB side to make sure someone isn't putting in garbage data and make sure that permissions are set properly so that users can only read their own _user data. The rendering would be done client-side by something like AngularJS. In essence you could just have a CouchDB server and a bunch of "static" pages and you're good to go. You wouldn't need any kind of server-side processing, just something that could serve up the HTML pages. Opening my database up to the world seems wrong, but in this scenario I can't think of why as long as permissions are set properly. It goes against my instinct as a web developer, but I can't think of a good reason. So, why is this a bad idea? EDIT: Looks like there is a similar discussion here: Writing Web "server less" applications EDIT: Awesome discussion so far, and I appreciate everyone's feedback! I feel like I should add a few generic assumptions instead of calling out CouchDB and AngularJS specifically. So let's assume that: The database can authenticate users directly from its hidden store All database communication would happen over SSL Data validation can (but maybe shouldn't?) be handled by the database The only authorization we care about other than admin functions is someone only being allowed to edit their own post We're perfectly fine with everyone being able to read all data (EXCEPT user records which may contain password hashes) Administrative functions would be restricted by database authorization No one can add themselves to an administrator role The database is relatively easy to scale There is little to no true business logic; this is a basic CRUD app

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  • log4js ConsoleAppender initialization

    - by perrierism
    I'm wondering if anyone happens to have some experience using Log4js? It seems its normal ConsoleAppender isn't always ready to use immediately after it's added to a logger object... If I have two sequential script tags in a document like: //Initialize logger <script type="text/javascript"> var logger = new Log4js.getLogger("JSLOG"); logger.addAppender(new Log4js.ConsoleAppender(logger, false)); logger.setLevel(Log4js.Level.INFO); </script> //Use logger <script type="text/javascript"> logger.info('Test test'); </script> ... It causes the console pop-up (pop-up window) to appear with an error message on page load: 12:58:23 PM WARN Log4js - Could not run the listener function () { return fn.apply(object, arguments); }. TypeError: this.outputElement is null The console is still initialised, it's there afterward, but for just that first logger call it doesn't seem to be there fully. If I make the first logger call setTimeout("logger.info('test test')", 1000), it doesn't have the error. So it's like it's not ready immediately. Anyone see this before or know what a workaround might be? Cheers

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  • Restful Java based web services in json + html5 and javascript no templates (jsp/jsf/freemarker) aka fat/thick client

    - by Ismail Marmoush
    I have this idea of building a website which service JSON data through restful services framework. And will not use any template engines like jsp/jsf/freemarker. Just pure html5 and Javascript libs. What do you think of the pros and cons of such design ? Just for elaboration and brain storming a friend of mine argued with the following concerns: sounds like gwt this way you won't have any control over you service api for example say you wanna charge the user per request how will you handle it? how will you control your design and themes? what about the 1st request the browser make? not easy with this all of the user's requests will come with "Accept" header "application/json" how will you separate browser from abuser? this way all of your public apis will be used by third party apps abusively and you won't be able to lock it since you won't be able to block the normal user browser We won't use compiled html anyway but may be something like freemarker and in that case you won't expose any of your json resources to the unauthorized user but you will expose all the html since any browser can access them all the well known 1st class services do this can you send me links to what you've read? keep in mind the DOM based XSS it will be a nightmare ofc, if what you say is applicable.

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  • Change button's enabled property via checkbox

    - by Ivan Stoyanov
    I tried this javascript but it doesn't work - here I need to change the button's enabled property to true when the checkbox is checked and to false when it isn't. This is my code. <tr> <td colspan="2" align="center"> <asp:CheckBox ID="cbAcceptAgreement" runat="server" OnClientClick="acceptAgreement(this)" /> <asp:Label ID="lblUserAgreement" runat="server" Text="I accept the " /> <asp:HyperLink ID="hlUserAgreement" runat="server" Text="User Agreement" NavigateUrl="Help/UserAgreement.aspx" /> </td> </tr> <tr> <td colspan="2" align="center"> <asp:Button ID="btnRegister" runat="server" Text="Register" /> </td> </tr> <script type="text/javascript"> function acceptAgreement(Obj) { document.getElementById('<%=btnRegister.ClientID%>').disabled = !obj.checked; } </script> Can you help me solve this problem?

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  • Optimize website for touch devices

    - by gregers
    On a touch device like iPhone/iPad/Android it can be difficult to hit a small button with your finger. There is no cross-browser way to detect touch devices with CSS media queries that I know of. So I check if the browser has support for javascript touch events. Until now, other browsers haven't supported them, but the latest Google Chrome on dev channel enabled touch events (even for non touch devices). And I suspect other browser makers will follow, since laptops with touch screens are comming. This is the test I use: function isTouchDevice() { try { document.createEvent("TouchEvent"); return true; } catch (e) { return false; } } The problem is that this only tests if the browser has support for touch events, not the device. Does anyone know of The Correct[tm] way of giving touch devices better user experience? Other than sniffing user agent. Mozilla has a media query for touch devices. But I haven't seen anything like it in any other browser: https://developer.mozilla.org/En/CSS/Media_queries#-moz-touch-enabled Update: I want to avoid using a separate page/site for mobile/touch devices. The solution has to detect touch devices with object detection or similar from JavaScript, or include a custom touch-CSS without user agent sniffing! The main reason I asked, was to make sure it's not possible today, before I contact the css3 working group.

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  • Checking whether images loaded after page load

    - by johkar
    Determining whether an image has loaded reliably seems to be one of the great JavaScript mysteries. I have tried various scripts/script libraries which check the onload and onerror events but I have had mixed and unreliable results. Can I reliably just check the complete property (IE 6-8 and Firefox) as I have done in the script below? I simply have a page wich lists out servers and I link to an on.gif on each server. If it doesn't load I just want to load an off.gif instead. This is just for internal use...I just need it to be reliable in showing the status!!! <script type="text/javascript"> var allimgs = document.getElementsByTagName('img'); function checkImages(){ for (i = 0; i < allimgs.length; i++){ var result = Math.random(); allimgs[i].src = allimgs[i].src + '?' + result; } serverDown(); setInterval('serverDown()',5000); } window.onload=checkImages; function serverDown(){ for (i = 0; i < allimgs.length; i++){ var imgholder=new Image(); imgholder.src=allimgs[i].src; if(!allimgs[i].complete){ allimgs[i].src='off.gif'; } } } </script>

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  • Youtube video on load through Jquery/JS

    - by jonthecoder2346
    My goal is to display a youtube video through a javascript function that will read the embedded code and load the video automatically in the div assigned. But I am not getting anything shown in the div assigned for the video. Is it because it has to be triggered by a button click? <script type="text/javascript"> var last_cnad_text_1 = ''; var options_cnad_text_1 = { embedMethod:'fill', maxWidth:320, maxHeight: 320 }; function loadVideo() { val = $('#cnad_text_1').val(); if ( val != '' && val != last_cnad_text_1 ) { last_cnad_text_1 = val; $("#embed_cnad_text_1").oembed(val,options_cnad_text_1); } } $(function(){ $('#cnad_text_1').keydown(loadVideo()); $('#cnad_text_1').click(loadVideo()); $('#cnad_text_1').change(loadVideo()); }); </script> <body> <input id="cnad_text_1" type="text" value="" size="60" name="cnad[text_1]"> <div id="embed_cnad_text_1"></div> </body> </html>

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  • Are super methods in JavaScript limited to functional inheritance, as per Crockford's book?

    - by kindohm
    In Douglas Crockford's "JavaScript: The Good Parts", he walks through three types of inheritance: classical, prototypal, and functional. In the part on functional inheritance he writes: "The functional pattern also gives us a way to deal with super methods." He then goes on to implement a method named "superior" on all Objects. However, in the way he uses the superior method, it just looks like he is copying the method on the super object for later use: // crockford's code: var coolcat = function(spec) { var that = cat(spec), super_get_name = that.superior('get_name'); that.get_name = function (n) { return 'like ' + super_get_name() + ' baby'; }; return that; }; The original get_name method is copied to super_get_name. I don't get what's so special about functional inheritance that makes this possible. Can't you do this with classical or prototypal inheritance? What's the difference between the code above and the code below: var CoolCat = function(name) { this.name = name; } CoolCat.prototype = new Cat(); CoolCat.prototype.super_get_name = CoolCat.prototype.get_name; CoolCat.prototype.get_name = function (n) { return 'like ' + this.super_get_name() + ' baby'; }; Doesn't this second example provide access to "super methods" too?

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  • Asynchronously get user data in facebook tab?

    - by Kristoffer Nolgren
    Using the php sdk, I check if a user inside a tab likes the corresponding page. If i put the following code inside index.php and use that page as my page-tab-url, <?php require_once("facebook/facebook.php"); // Create our application instance // (replace this with your appId and secret). $facebook = new Facebook(array( 'appId' => '1399475990283166', 'secret' => 'mysercret', 'cookie' => true )); $signed_request = $facebook->getSignedRequest(); echo $signed_request['page']['liked']; ?> it outputs '1'. I would like to achieve this asynchronously instead, so I put the php in a separate file and try to access it using ajax instead $http.post('/facebook/likes.php'). success(function(data){ console.log(data); }).error(function(data){ console.log(data); } ); This sample is using angular, but what javascript library i'm using probably doesn't matter. When I access the info with javascript Facebook doesn't seem to get the info that I liked the page. Adding a print_r($facebook); on the page I'm retreiving the same values as if i'm not in a facebook-tab: ( [sharedSessionID:protected] => [appId:protected] => 1399475990283166 [appSecret:protected] => 679fb0ab947c2b98e818f9240bc793da [user:protected] => [signedRequest:protected] => [state:protected] => [accessToken:protected] => [fileUploadSupport:protected] => [trustForwarded:protected] => ) Can I access theese values asynchronosly somehow?

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