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  • how does an object knows about its parent in javascript

    - by alter
    Lets suppose I made a class called Person. var Person = function(fname){this.fname = fname;}; pObj is the object I made from this class. var pObj = new Person('top'); now I add one property to Person class, say lname. Person.prototype.lname = "Thomsom"; now pObj.lname gets me "Thomson". My question is that, when pObj didn't find the property lname in it, how does it know where to look for.

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  • Javascript: parseInt() with trailing characters

    - by chris_l
    parseInt("7em", 10); returns 7 in all browsers I tested [*]. But can I rely on this? The reason I ask is, that I want to perform some calculations based on em, like /* elem1.style.top uses em units */ elem2.style.top = parseInt(elem1.style.top, 10) + 1 + "em"; I could do this with regular expressions, but parseInt is easier to use, and probably a bit faster. Or is there another solution (maybe using jQuery)? [*] Tested so far on: IE 6, IE 8, Safari 4, Firefox 3.6, Opera 10.5

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  • Creating a Drop-Down Menu with Javascript

    - by iceteea
    Question about logics here: What's the most elegant way to make the menu appear/disappear onmouseover/onmouseout? See the following JsBin: http://jsbin.com/owayeb/edit#source The Menu is hidden by default. If the user moves his cursor above the Link the showme() function gets called. When the user moves his cursor away the hideme() functions gets called. How would I get the Menu to persist while the user moves his mouse away from the Link to above the Menu? Or is this all the wrong school of thought?

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  • Javascript - undefined cookie value?

    - by Computeras
    Try running the code, I know the problem is in the 1. part. Thanks in advance, P.S. I'm a newbie in JS. <html> <head> <script> { //1. part var Cookies = ""; function createCookie(name,value,days) { if (days) { var date = new Date(); date.setTime(date.getTime()+(days*24*60*60*1000)); var expires = "; expires="+date.toGMTString(); } else var expires = ""; document.cookie = name+"="+value+expires+"; path=/"; } function readCookie(name) { var nameEQ = name + "="; var ca = document.cookie.split(';'); for(var i=0;i < ca.length;i++) { var c = ca[i]; while (c.charAt(0)==' ') c = c.substring(1,c.length); if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length); } return null; } function eraseCookie(name) { createCookie(name,"",-1); } //2. part function saveIt(name) { var x = document.forms['cookieform'].cookievalue.value; if (!x) alert('Please fill in a value in the input box.'); else { Cookies.create(name,x,7); alert('Cookie created'); } } function readIt(name) { alert('The value of the cookie is ' + Cookies[name]); } function eraseIt(name) { Cookies.erase(name); alert('Cookie erased'); } function init() { for (var i=1;i<3;i++) { var x = Cookies['ppkcookie' + i]; if (x) alert('Cookie ppkcookie' + i + '\nthat you set on a previous visit, is still active.\nIts value is ' + x); } } } </script> <body> <form name = "forma"> <input type = "text" name = "cookievalue"> <input type = "button" value = "Spremi" onClick = "saveIt('ppkcookie1')"> <input type = "button" value = "Ispisi" onClick = "readIt('ppkcookie1')"> </form> </body> </html>

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  • Update someones birthday with javascript

    - by user2768038
    So far the only mathematical way I can think of doing it is this: var age = 18 var today = new Date(); var myDate = new Date(); myDate.setFullYear(2013,3,13); /* My birthday is april 13th */ var y = (today - myDate); var days = ( y / (1000*60*60*24)); if(days >= 360){ var age = age +1; } if(days >= 720){ var age = age +1; } //etc...... document.write(age); Is there a better way of doing the if statements? so that I don't have to write one out for every year? I can't think!

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  • Javascript simple regexp doesn't work

    - by bah
    Hi, I have this code, it looks alright and is really basic, but i can't make it work: function checkValid(elem){ var abc = elem.value; var re = "/[0-9]/"; var match = re.test(abc); alert(match); } It matches 0 and 9, but not 1 to 8, what's wrong here? Thanks.

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  • Asign Id's dynamically to DOM elements with javascript.

    - by jnkrois
    Hello everybody, I just have a quick question about how to generate id's on-the-fly for HTML elements. So far I've tried a few things, I started with a "for" loop, I already know how many elements I have to generate Id's for, in this case I have an "ul" with 6 "li". My "for" loop is as follows: var items = $("ul li").length; for(var i = 0; i <= items; i++){ $("ul li").attr("id", "number" + i); } "number" would be the new id concatenated with "i", so I get a different Id for each "li". As you can probably tell, this does not work, because I end up with the same Id for each "li": in this case I get <li id="number6">... </li> for all the "li" elments in the "ul". I tried a "while" loop and ".each()" with jQuery but I get the exact same thing. Any help would be appreciated.

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  • Document width calculated via Javascript is different in Firefox compared to other browsers

    - by Scarpelius
    I have a problem with retrieving the current page document width from Mozilla Firefox. While the rest of the browsers report the correct width of the document, Firefox reports a smaller one (example: at screen resolution of 1920x1080 IE, Chrome and Safari reports 1920 while Firefox reports 1903). I use document width in $(document).ready(function() { ... }); to reposition a div element. Funny this is that after using alert() inside this function, the element reposition correctly, though the document size is still smaller than other browsers.

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  • jquery/javascript to disable button within a table cell

    - by user1831612
    I have a table cell with 2 buttons in it. <td align="left" > <input type="button" value="edit"/> <input type="button" value="save" disabled="disabled"/> </td> By default save button is disabled. On the click of edit button, save button button must be enabled. The problem is i cannot assign id's to buttons since the table is dynamically generated using struts2 s:iterator tag. If i do there will be 2 or more cells with the same id How can I achieve this?

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  • Set hidden form field values with JavaScript but request still empty

    - by tigerstyle
    HI volks, I try to set some hidden form field values with an onclick event. Ok, after I did something like this: document.getElementById('hidden_field').value = 123; I can output the value with the firebug console by entering this: alert(document.getElementById('hidden_field').value); So the values are definitely set. But now when I submit the form, the hidden field values are still empty. Do you have any idea whats going wrong? Thx for your answers.

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  • Javascript: find array by name

    - by Kin
    Hi, I have some js arrays and I want to find the arrays by name. for example: arr1 = [1,2,3]; arr2 = [3,4,5]; And access them like this: var intNum = 2; var arrName = 'arr' + intNum; arrName[0]; // equals 3 Is this possible? Thanks, Kevin

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  • Why is this NaN to javascript?

    - by MJB
    I have this object printed with console.log Array[1] 0: Object address: "blablabalbala" datatype: "Location" icon: "cafetaria" id: "/mensa/wo_mensa1_turm.std.php" kind: "Mensa" lat: 50.777016 lon: 6.080348 sortkey: "zeltmensa, forum cafete" stationId: "/mensa/wo_mensa1_turm.std.php" title: "Zeltmensa, Forum Cafete" type: "Mensa" But console.log("nav to: "+data[0].lat+" "+data[0].lon); gives me undefined undefined, and at another point NaN NaN.. I don't understand this. It also doesn't let me use any other attributes like data[0].addresse, which returns undefined aswell. Thanks for help.

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  • reset selectOneMenu javascript

    - by user234194
    The following code resets one selectOneMenu through particular id. How to make it dynamic for more selectOneMenus to reset at the top value. var test= document.getElementById('form1:text3'); test.options.selectedIndex=0; This resets to top value of menu, but how to make it dynamic. ANy help is appreciated.

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  • Create an object with javascript reflection?

    - by acidzombie24
    I am doing something wrong. At the end of this o is empty. I want to pass in a string such as a=3&zz=5 and do o.a and o.zz to retrieve 3 and 5. How do i generate this object? function MakeIntoFields_sz(sz) { var kvLs = sz.split('&'); var o = new Array(); for (var kv in kvLs) { var kvA = kvLs[kv].split('='); var k = ''; var v = ''; if (kvA.length > 0) { k = kvA[0]; if (kvA.length > 1) v = kvA[1]; o[k] = v; } } return o; };

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  • Javascript ( jQuery ) Error: SyntaxError: missing ) after argument list

    - by Obmerk Kronen
    I have the simplest function : jQuery(document).ajaxSuccess(function(e, xhr, settings) { var widget_id_base = '099_cf_samurai_widget'; if(settings.data.search('action=save-widget') != -1 && settings.data.search('id_base=' + widget_id_base) != -1) { // alert(\'yay!'\); my_function_chosen_099(); } }); function my_function_chosen_099(){ jQuery(".chzn-select").chosen(); } which works just fine , but When I add the width Parameter like so : function my_function_chosen_k99(){ jQuery(".chzn-select").chosen(width:'95%'); } it gives me an error of: Error: SyntaxError: missing ) after argument list Source File: http://localhost/my-path/js/o99.chosen.init.js?ver=k99 Line: 20, Column: 41 Source Code: jQuery(".chzn-select").chosen(width:"95%"); .............................................| I have tried escaping: jQuery(".chzn-select").chosen(width:\"95%"\); and even double jQuery(".chzn-select").chosen(width:\\"95%"\\); and in my desperation, even jQuery(".chzn-select").chosen( width:"95%" ); I checked and rechecked the closing of brackets , and also tried with single quotes ' - but nothing . There appear to be a lot of similar questions here , but all I saw was escaping problems, ANd I have tried all that I know .. What is wrong here ?? I assume it is not a simple syntax error - or is it ? ( one which I can not find .. )

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  • Simple nested setTimeout() only runs once (JavaScript)

    - by danielfaraday
    For some reason my galleryScroll() function only runs once, even though the function calls itself using setTimeout(). I'm thinking the issue may be related to scope, but I'm not sure: http://jsfiddle.net/CYEBC/2/ $(document).ready(function() { var x = $('#box').offset().left; var y = $('#box').offset().top; galleryScroll(); function galleryScroll() { x = x + 1; y = y + 1; $('#box').offset({ left: x, top: y }); setTimeout('galleryScroll()', 100); } });? The HTML: <html> <head> </head> <body> <div id="box"> </div> </body> </html>

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