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• Hiding and Showing Elements with JavaScript

  - by user1658756

  I have an arrow on my site that I'd like if onclick, it hides one element, and shows another. Hitting it again, will hide the element that was shown and show the element that was hidden. Is that possible to do without jQuery? For example, I have <div id="arrow"><a href="#">?</a></div> <div id="ad"></div> <div id="description">Hidden</div> <div id="nav">Also Hidden</div> So at first, the ad is showing, and then one you've clicked the arrow, I'd like the ad to hide, and then unhide the description and nav.

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• Inserting a newline into a pre tag (IE, Javascript)

  - by Itay

  In IE when I insert text into a <pre> tag the newlines are ignored: <pre id="putItHere"></pre> <script> function putText() { document.getElementById("putItHere").innerHTML = "first line\nsecond line"; } </script> Using \r\n instead of a plain \n does not work. <br/> does work but inserts an extra blank line in FF, which is not acceptable for my purposes.

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• IE incompatibility with JavaScript (surprised?)

  - by Midevil Chaos

  I am coding my website, and a friend of mine was helping me. This code does not work on IE 10 (Windows 7). I even tried the legacy modes and to no avail. Upon clicking on "services" for example, this code would work on FF or Chrome. But, not on IE. Can someone help me fix this code so it would also work on IE? $('#services-fr-2').on('click',function(){ $( ".clientsFr" ).hide(); $('.servicesFr').fadeToggle(); $('#green-pouch-fr').animate({ 'top':'450px'//, //'height':'450' })

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• This process does not work in JavaScript: createElement() -> setAttribute('id') -> getElementById()

  - by kristovaher

  I was so sure that this question has been answered a thousand times before, but I've been unable to find an answer in StackOverflow. If there is already an answer and I was unable to find it then I apologize. I create hidden form elements dynamically like this: submitForm=document.getElementById('my-form'); var element=document.createElement('input'); element.id='hidden-form-data'; // or setAttribute('id','hidden-form-data'); element.name='my-hidden-form-data'; element.type='hidden'; element.value='my-data'; submitForm.appendChild(element); This works and the input field is created and it is taken into account when submitting the form. But I want to remove it after I have dynamically created it. I was sure that creating a new node this way would be 'correct' for browser and DOM, but apparently it is not. This returns null: element=document.getElementById('hidden-form-data'); if(element!=null){ element.parentNode.removeChild(element); } But it never gets removed and is always null. Is there any way I can remove a dynamically created node with an ID? Thank you! Please do not suggest jQuery, it's not possible to use jQuery for this, footprint is too heavy for such a small task I could not get a working answer from here, which was the closest thread I could find.

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• Collision Handling in Javascript - Particles Get Stuck

  - by Conner Ruhl

  I am trying to recreate this, and I have been fairly successful. I am having issues with the collision handling though. Although the collision handling seems to work, it has very strange behavior. Here is what I have so far. This is the code that handles collisions: var dx = particle2.getX() - particle1.getX(); var dy = particle2.getY() - particle1.getY(); var angle = Math.atan2(dy, dx); var newP2X = particle1.getX() + (particle1.getRadius() + particle2.getRadius()) * Math.cos(angle); var newP2Y = particle1.getY() + (particle1.getRadius() + particle2.getRadius()) * Math.sin(angle); particle2.setX(newP2X); particle2.setY(newP2Y); var p1Vxi = particle1.getVx(); var p1Vyi = particle1.getVy(); var p1Mass = particle1.getMass(); var p2Vxi = particle2.getVx(); var p2Vyi = particle2.getVy(); var p2Mass = particle2.getMass(); var vxf = (p1Mass * p1Vxi + p2Mass * p2Vxi) / (p1Mass + p2Mass); var vyf = (p1Mass * p1Vyi + p2Mass * p2Vyi) / (p1Mass + p2Mass); particle1.setVx(vxf); particle1.setVy(vyf); particle2.setVx(vxf); particle2.setVy(vyf); EDIT: I have tried to change it to inelastic collisions like suggested, but for some reason the balls collide erratically. Check it out here. Any help is much appreciated!

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• JavaScript/jQuery - onhashchange event workaround

  - by MJLefevre

  Until all browsers support the onhashchange event what is the best workaround for this? Is there something for this in jQuery? or as a plug-in?

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• Javascript: regular expression

  - by Dmitry Nesteruk

  I need to replace a substring from some string. I've already created corrected code for doing it. But I amn't sure is it best way. Please, see code below: var str = 'test ruby,ruby on rails,ruby,' var substr = 'ruby'; var reg = new RegExp(',' + substr + ',|^' + substr + ',', 'gi'); str.replace(reg, ','); //returns "test ruby,ruby on rails,"

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• Split a sting array into a number array in javascript

  - by Wesley Skeen

  I am reading a value from a dropdown list depending on what option is selected. I am using jqPlot to graph the values. jqPlot expects an array of values like [91, 6, 2, 57, 29, 40, 95] but when I read the value in from the dropdown box it is coming in as a whole string "[91, 6, 2, 57, 29, 40, 95]" I tried splitting it but I got ["91", "6", "2", "57", "29", "40", "95"] which wont display the graph correctly. Is there anybody that has encountered something like this before and what can I do to make my values convert into a number array. Thanks for any help

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• Skipping arguments in JavaScript

  - by hekevintran

  function my_func(a, b){ if(typeof(a) !== 'undefined'){ // do stuff } return b; } How can I call this function will only the second argument? In other words, I want a to be undefined.

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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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• JavaScript: If clause partially executed !!!

  - by arwa

  Hi everyone My problem is that when the condition is true it will close the window but not execute the php part ! here goes my code.. function onClose() { var r=confirm("Is the meeting Over!"); if (r==true) { window.close(); } else { } } </blink> this is the php part.. $sql="UPDATE previousmeetings SET Live='0' WHERE MeetingID='34'"; //$meeting_id $sql2="UPDATE previousmeetings SET Live='1' WHERE MeetingID='34'";

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• How to make this JavaScript much faster?

  - by Ralph

  Still trying to answer this question, and I think I finally found a solution, but it runs too slow. var $div = $('<div>') .css({ 'border': '1px solid red', 'position': 'absolute', 'z-index': '65535' }) .appendTo('body'); $('body *').live('mousemove', function(e) { var topElement = null; $('body *').each(function() { if(this == $div[0]) return true; var $elem = $(this); var pos = $elem.offset(); var width = $elem.width(); var height = $elem.height(); if(e.pageX > pos.left && e.pageY > pos.top && e.pageX < (pos.left + width) && e.pageY < (pos.top + height)) { var zIndex = document.defaultView.getComputedStyle(this, null).getPropertyValue('z-index'); if(zIndex == 'auto') zIndex = $elem.parents().length; if(topElement == null || zIndex > topElement.zIndex) { topElement = { 'node': $elem, 'zIndex': zIndex }; } } }); if(topElement != null ) { var $elem = topElement.node; $div.offset($elem.offset()).width($elem.width()).height($elem.height()); } }); It basically loops through all the elements on the page and finds the top-most element beneath the cursor. Is there maybe some way I could use a quad-tree or something and segment the page so the loop runs faster?

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• jquery javascript error using $(...) selector

  - by waitinforatrain

  Hi, I'm migrating some old code to jquery: xmlHttp.onreadystatechange = function() { if (xmlHttp.readyState == 4) { $("#" + ajaxArea).html (xmlHttp.responseText); $("#" + ajaxArea).attr('title', 'Login'); $("#" + ajaxArea).dialog({ height : 140, modal : true }); } }; where ajaxArea is the ID of a DIV in the HTML. The dialog bit is basically adapted from the jQuery example here: http://jqueryui.com/demos/dialog/#modal All of it works fine up until the last line. Firefox throws an error that simply says "$(" for that line. Anyone know what might be causing this?

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• Javascript object encapsulation that tracks changes

  - by Raynos

  Is it possible to create an object container where changes can be tracked Said object is a complex nested object of data. (compliant with JSON). The wrapper allows you to get the object, and save changes, without specifically stating what the changes are Does there exist a design pattern for this kind of encapsulation Deep cloning is not an option since I'm trying to write a wrapper like this to avoid doing just that. The solution of serialization should only be considered if there are no other solutions. An example of use would be var foo = state.get(); // change state state.update(); // or state.save(); client.tell(state.recentChange()); A jsfiddle snippet might help : http://jsfiddle.net/Raynos/kzKEp/ It seems like implementing an internal hash to keep track of changes is the best option. [Edit] To clarify this is actaully done on node.js on the server. The only thing that changes is that the solution can be specific to the V8 implementation.

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• Javascript/Jquery - Reset text box view area after tab

  - by JK

  I don't know what this is called so its hard to google for it. If you have a plain html input type=text with a small width eg 20 and then type more characters than can be displayed, it shows the last characters you type. And the first ones are scrolled out of view: This is my long text // this is the whole string my long string // this is what is actually visible in the input box How do I make it so that when you hit tab, the view area resets so that the start of the string is visible and the end is hidden? my long string // this is what is visible in the input box when typing This is my // this is what is I want to be visible in the input box after you hit tab What do you call this, and how do you do it?

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• Resizing iframe height using javascript issue

  - by Camran

  I have an iframe which content is a php-file, and that php-file displays some mysql records. The more records, the larger the iframe height should get, otherwise it wont show all of the information in the iframe. Here is a code I have for dynamically setting the iframe height, from the iframes content (the php file): var x = document.body.scrollHeight; x = x + 20 + 'px'; window.parent.document.getElementById("iframe001").style.height=x; iframe001 is the iframe I am referring to above. I am adding 20px of height extra because of borders etc... Now, sometimes this resizing works, sometimes it doesn't. Does anybody know why it works sometimes. If I alert the 'x' variable, it shows different values sometimes, but most times it works. Any other ways you know of setting the iframes height from the content of the iframe? Thanks

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• Accessing HTML DOM elements from javascript using `.childNodes`

  - by Martin

  I'm wondering about the .childNodes property, I have the code below, and for some reason I get 18 children, while 6 are HTMLInputElements as expected, and the rest are undefined. What is this about? Is there an efficient way to iterate over the input elements? <html> <head> <script> window.onload = function(e){ form = document.getElementById('myForm'); alert(form.childNodes.length); for(i=0; i<form.childNodes.length; i++){ alert(form[i]); } } </script> </head> <body> <form id='myForm' action="haha" method="post"> Name: <input type="text" id="fnameAdd" name="name" /><br /> Phone1: <input type="text" id="phone1Add" name="phone1" /><br /> Phone2: <input type="text" id="phone2Add" name="phone2" /><br /> E-Mail: <input type="text" id="emailAdd" name="email" /><br /> Address: <input type="text" id="addressAdd" name="address" /><br /> <input type="submit" value="Save" /> </body> </html>

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• to call a javascript function periodically

  - by shinod

  I want to call function with arguement periodically. I tried setTimeout("fnName()",timeinseconds); and it is working. But when I add an arguement it won't work. eg: setTimeout("fnName('arg')",timeinseconds);

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• JavaScript array random index insertion and deletion

  - by Tomi

  I'm inserting some items into array with randomly created indexes, for example like this: var myArray = new Array(); myArray[123] = "foo"; myArray[456] = "bar"; myArray[789] = "baz"; ... In other words array indexes do not start with zero and there will be "numeric gaps" between them. My questions are: Will these numeric gaps be somehow allocated (and therefore take some memory) even when they do not have assigned values? When I delete myArray[456] from upper example, would items below this item be relocated? EDIT: Regarding my question/concern about relocation of items after insertion/deletion - I want to know what happens with the memory and not indexes. More information from wikipedia article: Linked lists have several advantages over dynamic arrays. Insertion of an element at a specific point of a list is a constant-time operation, whereas insertion in a dynamic array at random locations will require moving half of the elements on average, and all the elements in the worst case. While one can "delete" an element from an array in constant time by somehow marking its slot as "vacant", this causes fragmentation that impedes the performance of iteration.

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• Javascript for loop efficiency

  - by Misha Moroshko

  Is for (var i=0, cols=columns.length; i<cols; i++) { ... } more efficient than for (var i=0; i<columns.length; i++) { ... } ? In the second variant, is columns.length calculated each time the condition i<columns.length is checked ?

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• how replace a character in a string in javascript

  - by nana

  i have a string : var s="here_we_go"; how can i replace all occurrence of '_' by '$' so the string will become: s="here$we$go";

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• minifying patched javascript files

  - by Stacia

  I'm writing a Rails app and I've partially integrated in this nice little patch to the in line ajax editor: http://inplacericheditor.box.re/ The problem is, on that page I have tinymce, prototype and scriptaculous included. In Firefox at least there's a big lag when all this stuff is loading. I was hoping to fix it by compressing the files so I checked out a plugin for rails called Smurf. It seemed to do what it was supposed to do nicely, but it choked on the little patch files that are included with the Ajax editor thing. THe patch files look like this: Object.extend(Ajax.InPlaceEditor.prototype, { handleAJAXFailure: function(transport) Alternatively, should I just be catching them instead of worrying about minfying them? I know I'm running on development and that Apache would maybe be handling serving the js files differently..It just seems like a lot of things to serve on one page.

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• JavaScript: how to use data but to hide it so as it cannot be reused

  - by loukote

  Hi all. I've some data that i'd like to publish just on one website, ie. it should not be reused on other websites. The data is a set of numbers that change every day, our journalists work to get hard gather it. Is there any way to hide, crypt, etc. the data in a way that it cannot be reused by others? But to show it in a graph in the same time? I found the ASCII to HEX tool that could be used for (http://utenti.multimania.it/ascii2hex/). I wonder if you can suggest other ways. (Even if I have to completely change the strategy.) Many thanks!

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• equivalent of javascript class using JSON

  - by brz dot net

  See following class: function availItem(xs, s, m, l, xl) { this.xs = xs; this.s = s; this.m = m; this.l = l; this.xl = xl; } How can I declare the above class using JSON? I think It should be in following manner but problem is to pass argument. var availItem = { xs : xs, s : s, m : m, l : l, xl : xl }

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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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