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JavaScript - Getelementbyid.addeventlistener Loop Help
I have created this statement and it does its job but not very efficient.
How can I put this in a loop and populate the information that I want anonymously? I do not want to copy and paste this for every (id) there is on this page. Locate id get value and use same value to change the bgColor of the page Code: <input id="red" value="red">red
<input id="green" value="green">green
<script>
document.getElementById('red').addEventListener('click', function (e) {
inputColor = e.target.getAttribute('value'); document.bgColor = inputColor; }, true);
<script>
Your help will be much appreciated! Thanks! Similar TutorialsHello, I need to do this. I have 36 Divs called "contenido1, contenido2, contenido3 etc.) And I want that "onclick" change a property of the css of all of them except 1. I know I can do this manually but its a lot of code lines so I think it would be another option to do ir in a loop. Right now i am using this: Code: div = document.getElementById('contenido1');
div.style.display='block';
div = document.getElementById('contenido2');
div.style.display='none';
div = document.getElementById('contenido3');
div.style.display='none';
div = document.getElementById('contenido4');
div.style.display='none';
....
So in that case I want for example that all the DIVS called "contenido 2 to contenido 36" display: none and only contenido 1 display block. In the next cases would be the same: All the divs called "contenido 1 to contenido 36" display: none except "contenido 2" that i want to display: block. So I can do it like this but are thousands of lines of code... and I am sure there are other more efficient option. Anybody knows how to do that? Probably is a simple question. Thank you!! I have the following code...the getelementbyId works fine it changes the value in the textfield aswell....but only in the first retrieved record...It is not working in any of the other records that are showed. Code is he <?php include("../connection/conn.php"); ?> <script type="text/javascript"> function notEmpty(){ var myTextField = document.getElementById('myText'); document.getElementById('myText').innerHTML = myTextField; if(myTextField.value != "") alert("You entered: " + myTextField.value) else alert("Would you please enter some text?") } </script> </head> <body> <?php $sql=mysql_query("select * from menuscript"); while($row=mysql_fetch_array($sql)) { ?> <div class="mine"> <?php echo $row['author'];?> <form> <input type='text' id='myText' /> <input type='button' onclick="notEmpty();" value='Form Checker' /> </form> </div> <?php }?> I'm trying to add an event handler for to my body, and for some reason which I can't figure out, it only works on Google Chrome. I wouldn't expect it to work in IE, but am wondering why it's not working in Firefox. Here's the relevant parts of the code: Javascript (in an external file) Code: var body = document.body;
body.addEventListener("load", Foo(), false);
function Foo(){
addEventListener(document.getElementsByName("start"),"click", alert("hello"), false);
}
HTML Code: <html> <head> <title>BREAKOUT!</title> <script src="breakout.js" type="text/Javascript" > </script> <LINK REL="stylesheet" HREF="breakout.css" TYPE="text/css"> </head> <body id="body"> <!-- etc.... --> Okay, I'm really am not getting this. So I came here hopefully for some help. I'm just trying to register a simple click event onto a input element with addEventListener and attachEvent... My code: Code: function addEvent(type, func, elem) {
var netscape = document.getElementById && !document.all;
var ie = document.all;
if(netscape) {
elem.addEventListener(type, func, true);
}
else if(ie) {
elem.attachEvent('on'+type, func);
}
}
//Which is then call by
addEvent('click', someFunction, theElementObject);
So say I had the following code like so: Code:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html lang="en">
<head>
<title>Example</title>
<link rel="stylesheet" type="text/css" href="./css/global.css" />
<script type="text/javascript">
function addEvent(type, func, elem) {
var netscape = document.getElementById && !document.all;
var ie = document.all;
if(netscape) {
elem.addEventListener(type, func, true);
}
else if(ie) {
elem.attachEvent('on'+type, func);
}
}
function clearTxt() {
var username = document.getElementById('username');
if(username.value == 'Screen Name') {
username.value = '';
}
}
addEvent('click', clearTxt, document.getElementById('username'));
</script>
</head>
<body>
<label for="username">Username:</label> <input name="username" type="text" value="Screen Name" id="username" maxlength="20" />
</body>
</html>
From what I can see and what I understand it should just on event of a click on the username input it should clear the username field. But instead I get a error message from IE saying, "null is null or not a object"???? Like that was any help. So could someone please help me figure out my misunderstanding of this method? Thanks, Jon W I'm trying to understand how a custom object can call a function within itself. Say I have something like this: Code: function functiontest()
{
this.prop1 = '',
this.prop2 = '',
this.options = {initiallevels:0},
this.prop3 = '/blah',
this.prop4 = true,
this.function4 = function(x)
{
console.log(x)
},
this.init = function(options)
{
this.uid=options.uid
this.t=options.target
document.getElementById(this.t).addEventListener('click',function(){this.uid.function4(this.t)},false)
}
}
myfun1=new functiontest
myfun1.init({uid:'myfun1',target:'target1'})
myfun2=new functiontest
myfun2.init({uid:'myfun2',target:'target2'})
And the html: Code: <html> <head></head> <body> <div id="target1">T1</div> <br> <div id="target2">T2</div> </body> </html> I don't know what to put in the part in bold to set the click event listener and have it call function4 within the functiontest object. I've tried a bunch of different things and nothing worked. Please help, thanks! Is it possible to add events using addEventListener to multiple radio buttons with same id ? <input id="radId" type="radio" value="0" name="radioname">No <input id="radId" type="radio" value="1" name="radioname">Yes I tried to attach event using document.getelementByID BUT it always picks the first radio button. Is there a way around this, any help would be highly appreciated. Thanks Hi folks, I'm having problem setting up event handling using member functions. Consider the following code snippet: Code: function Widget()
{
...
this.register = function()
{
...
document.getElementById(this.id).addEventListener('click', this.default_click_handler, false);
}
this.default_click_handler = function(event)
{
this.do_something_useful(); //<--???
}
this.do_something_useful = function()
{...}
}
However I don't manage to call do_something_useful(), I get a this.do_something_useful() is not a function error. What am I doing wrong? Any help is appreciated, Thanks, A. Code: function offPar(){
alert(this.offsetParent.id);
}
function init(){
var mine = document.getElementById("mid");
var other = document.getElementById("inner");
mine.addEventListener("click", offPar, false);
other.addEventlistener("click", offPar, false);
}
window.addEventListener('load', init, false);
HTML :
<div id = "content">
<div id = "mid">
<div id = "inner">
<p class = "par">
</p>
</div>
</div>
</div>
I can add an event listener to the #mid div but I can't to the #inner div. Anyone now why this is? Sorry I can't provide more info. That's all I Know! TTFN John Hi, I have the following code: Code: function addHandlers()
{
var elementList = new Array();
elementList.push(new Element("newhomesdiv", "images/newhomes.png", "images/newhomes-over.png"));
elementList.push(new Element("additionsdiv", "images/additions.png", "images/additions-over.png"));
elementList.push(new Element("homeimprovdiv", "images/homeimprove.png", "images/homeimprove-over.png"));
elementList.push(new Element("aboutusdiv", "images/aboutus1.png", "images/aboutus-over1.png"));
for(var i = 0; i < elementList.length; i++)
{
var curNode = document.getElementById(elementList[i].parentId).firstChild;
var item = elementList[i];
if(curNode)
{
/*if(curNode.addEventListener)
{
curNode.addEventListener("mouseover", function(){makeCallback(item.parentId, item.hoverImage)}, false);
curNode.addEventListener("mouseout", function(){makeCallback(item.parentId, item.regImage)}, false);
}
else if(curNode.attchEvent)
{
curNode.attachEvent("onmouseover", function(){makeCallback(item.parentId, item.hoverImage)});
curNode.attachEvent("onmouseout", function(){makeCallback(item.parentId, item.regImage)});
}
else
{
curNode["onmouseover"] = makeCallback(item.parentId, item.hoverImage);
curNode["onmouseout"] = makeCallback(item.parentId, item.regImage);
}*/
curNode.onmouseover = makeCallback(item.parentId, item.hoverImage);
curNode.onmouseout = makeCallback(item.parentId, item.regImage);
}
}
}
function makeCallback(parId, image)
{
return function() {
changeImage(parId, image);
};
}
function changeImage(parId, image)
{
document.getElementById(parId).firstChild.src = image;
}
The curNode.onmouseover = makeCallback(item.parentId, item.hoverImage); works, but I want to use addEventListener and fallback to the other methods. I don't understand why the addEventListener and attachEvent parts doesn't work. Any ideas? Every time i click on one of the said elements, it puts "undefined" into the textbox each time i click on an element. it seems to me that the Key_Table[x] is not getting passed correctly. How do i make sure that this is getting passed correctly? Here's my Code: Code: <script type='text/javascript'>
// Startup Script
if (document.addEventListener) {
document.addEventListener("DOMContentLoaded", LoadEventListeners, false);
}
function LoadEventListeners()
{
var Key_Table = ["q", "w", "e", "r", "t", "y", "u", "i", "o", "p"];
// Create event Listeners for the alphabetic keys
for(var x = 0; x < Key_Table.length; x++)
{
Key_Table[x] = document.getElementById(Key_Table[x]);
Key_Table[x].addEventListener("click",
function(){
InsertChar(Key_Table[x]);
},
false);
}
}
function InsertChar(Char)
{
alert("Char is:" + Char);
// Textbox data
document.getElementById('TextData').value = document.getElementById('TextData').value + Char;
}
</script>
On my site we have image galleries that pop up over top of the page in a higher z-index and position:fixed, and another div between the gallery and background with opacity set to about 85%. The image gallery div has a close button, and I was asked to make the gallery also close by pressing ESC, so I added this: igevt=function(evt){checkclosegal(evt)} window.addEventListener('keypress',igevt, false) and checkclosegal: function checkclosegal(evt) { if(evt.keyCode==27) { closebgeagal() window.removeEventListener('keypress',igevt, false) } } This works perfectly in Firefox and Opera, but Chrome and Safari don't fire the event (not worried about ie right now - I know it uses attachEvent). Could it have something to do with the gallery being in a higher z-index? Please help, thanks! Good day! Here is the problem, setting the slider to the site, here's an example: http://wowslider.com/best-jquery-sli...near-demo.html and do not connect different effects on this slider, such as buttons on the sides and smooth shifting slides. When you see the code generates this error: Uncaught TypeError: Cannot read property addEventListener' of undefined I do not know what this error, help, error on this site: http://uh219381.ukrdomen.com/ Or here's the code: http://uh219381.ukrdomen.com/themes/...1/wowslider.js sorry for my English Hi there Im trying to create a function where i pass two element id's and my script populates it with events and anything else it may need to run but what i am finding is that i cant use this so that the instance of the object is kept what ends up happening is nothing at all what i would like to have happen is the code to work somthing like this... Code: <div id="iAmTheTargetId">
</div>
<div id="iWillHoverOverYouId">
</div>
<script type="text/javascript">
var element = new hoverBox('iAmTheTargetId','iWillHoverOverYouId');
</script>
and simply running that would then create the equivalent of doing Code: <div id="iAmTheTargetId" onmouseover="element.activate()" onmouseout="element.deactivate()" onmousemove="element.update(event)>
</div>
<div id="iWillHoverOverYouId">
</div>
<script type="text/javascript">
var element = new hoverBox('iAmTheTargetId','iWillHoverOverYouId');
</script>
But of course the code above won't actual add onmouseover and etc it just so you can see what i'm trying to achieve Code: /*
* triggerId
* the element in which the attributes will be applied to
*
* hoverBoxid
* the element in which will hover around the triggerId
*/
function hoverBox(triggerId,hoverBoxid){
this.triggerElement = document.getElementById(triggerId);
this.hoverBoxElement = document.getElementById(hoverBoxid);
if(this.triggerElement == null || this.hoverBoxElement){
return null;
}
self = this;
alert(this.triggerElement);
this.triggerElement.addEventListener('mouseover',function(){self.activate();},false);
this.triggerElement.addEventListener('mouseout',function(){self.deactivate();},false);
this.triggerElement.addEventListener('mousemove',function(){self.update(event);},false);
}
hoverBox.prototype = {
triggerElement : null,
hoverBoxElement : null,
state : false
};
hoverBox.prototype.activate = function(){
this.state = true;
};
hoverBox.prototype.deactivate = function(){
if(this.state != false){
this.hoverBoxElement.style.display = "none";
this.state = false;
}
};
hoverBox.prototype.update = function(evt){
if(this.state != false){
this.hoverBoxElement.style.display = "block";
this.hoverBoxElement.style.position = "absolute";
this.hoverBoxElement.style.top = (evt.clientY + 5)+ "px";
this.hoverBoxElement.style.left = (evt.clientX + 10)+ "px";
}
};
A quick note theses function will work by them selfs if you just do Code: <div id="target" onmouseover="aHoverBox.activate()" onmouseout="aHoverBox.deactivate()" onmousemove="aHoverBox.update(event)">
</div>
<div id="hover">
</div>
<script type="text/javascript">
var aHoverBox = new hoverBox('iAmTheTargetId','iWillHoverOverYouId');
</script>
But not quite what I'm after i would like not to have to enter in Code: onmouseover="aHoverBox.activate()" onmouseout="aHoverBox.deactivate()" onmousemove="aHoverBox.update(event)" and have that done by the JavaScript Well i hope every thing makes scene sorry if i repeated my self just making sure you understand me Hopefully some of you guys can help. I'm self taught in Javascript so only know little bits here and there (and don't even know if the thread title is labelled right for what I'm doing!) so help would be greatly appreciated. I'm trying to create 4 buttons on a page (buttons shown by "click here to view c1, c2" etc.) however after I've clicked one button and the content is showing below, the content from the next button clicked does not show (almost as if it is hidden underneath). I'm looking for a way of showing the content when the button is clicked, but hiding it once another button is clicked so other content is shown. Hopefully this is clear enough. All help, tips or advice will be appreciated. Thankyou. Code: <script type="text/javascript" language="JavaScript"><!--
function InsertContent(tid) {
if(document.getElementById(tid).style.display == "none") {
document.getElementById(tid).style.display = "";
}
else {
document.getElementById(tid).style.display = "none";
}
}
//--></script>
<table width="100%" cellspacing="4" cellpadding="4" border="0" align="center">
<tbody>
<tr>
<td width="25%"><a href="javascript:InsertContent('c1');"> Click to see C1</a></td>
<td width="25%"><a href="javascript:InsertContent('c2');"> Click to see C2</a></td>
<td width="25%"><a href="javascript:InsertContent('c3');"> Click to see C3</a></td>
<td width="25%"><a href="javascript:InsertContent('c4');"> Click to see C4</a></td>
</tr>
</tbody>
</table>
<hr />
<div style="display: none; border: 0px dashed black; background-color: white; color: black; font-weight: bold; padding: 5px; margin: 5px;" id="c1">CONTENT C1
</div>
<div style="display: none; border: 0px dashed black; background-color: white; color: black; font-weight: bold; padding: 5px; margin: 5px;" id="c2">CONTENT C2
</div>
<div style="display: none; border: 0px dashed black; background-color: white; color: black; font-weight: bold; padding: 5px; margin: 5px;" id="c3">CONTENT C3
</div>
<div style="display: none; border: 0px dashed black; background-color: white; color: black; font-weight: bold; padding: 5px; margin: 5px;" id="c4">CONTENT C3
</div>
hi quick question, i have 640 hidden html inputs like this but with different names. <input type="hidden" name="b1r1c1" value"some value"> now i want to use document.getElementById('b1r1c1).value = "whatever"; will that work eventhough there is no id on my hidden value. it will be in a hta by the way. thanks hi, In my code below, I cannot get the setting_id value as it falls outside of the loop. I have just tried to put in the getElementById function but it's not working?! I get the error: missing ) after formal parameters JavaScript from this: Code: function confirmqualification(ID) {
to this: Code: function confirmqualification(document.getElementById('setting_id')) {
HTML from this: Code: <input type="button" name="remove" id="remove" value="Remove" onClick="javascript:confirmqualification('<?php echo $row1['setting_id']?>')" />
to this: Code: <input type="button" name="remove" id="remove" value="Remove" onClick="javascript:confirmqualification()" /> Hello smart people... perhaps someone can figure this one out. I hope it's not a PHP question. I have a form and need to populate FIELD2 with the result of FIELD1. Field one is a dynamic list from a database, where the value is an ID#, but the list shows the name. I want to populat FIELD2 with the name that is chosen, not the id (I can't get anything to work) Here is the code from the 2 fields: FIELD 1: Code: <select name = "" realname = "{#role#}" required="1" exclude = "-1" id = "roleselect">
<option value="-1" selected="selected">Choose</option>
<option value = "{$roles[role].ID}" id="role{$roles[role].ID}">{$roles[role].name}</option>
FIELD 2: Code: <input type="hidden" name="rolename" id="rolename" required="0" realname="rolename" /> Here is the javascript I tried to populate field 2 with the selected option of field 2: Code: function updaterole(){
document.getElementById("rolename").value =document.getElementById("role").value;
I tried using name instead of value for field 1, but that didn't work either. The db just shows empty. thanks for any help! Ok, I'm nearly pulling my hair out with this one. I have been looking at this code for two evenings now, and rewrote it 4 times already. It started out as jQuery code and now it's just concatenating strings together. What I'm trying to do: Build a menu/outline using unordered lists from a multidimensional array. What is happening: Inside the buildMenuHTML function, if I call buildMenuHTML, the for loop only happens once (i.e. only for 'i' having a value of '0'.) If I comment out the call to itself, it goes through the for loop all 3 times, but obviously the submenus are not created. Here is the test object: Code: test = [
{
"name" : "Menu 1",
"url" : "menu1.html",
"submenu" : [
{
"name" : "menu 1 subitem 1",
"url" : "menu1subitem1.html"
},
{
"name" : "menu 1 subitem 2",
"url" : "menu1subitem2.html"
} ]
},
{
"name" : "Menu 2",
"url" : "menu2.html",
"submenu" : [
{
"name" : "menu 2subitem 1",
"url" : "menu2subitem1.html"
},
{
"name" : "menu 2subitem 1",
"url" : "menu2subitem1.html"
} ]
},
{
"name" : "Menu 3",
"url" : "menu3.html",
"submenu" : [
{
"name" : "menu 3 subitem 1",
"url" : "menu3subitem1.html"
},
{
"name" : "menu 3 subitem 1",
"url" : "menu3subitem1.html"
} ]
}
];
Here is the recursive function: Code: function buildMenuHTML(menuData,level) {
var ul;
if (level == 1) {
ul = "<ul id='menu'>";
} else {
ul = "<ul class='level" + level + "'>";
}
for (i = 0; i < menuData.length; i++) {
menuItemData = menuData[i];
ul += "<li>";
ul += "<a href='" + menuItemData.url + "'>" + menuItemData.name + "</a>";
if (typeof menuItemData.submenu != 'undefined') {
ul += buildMenuHTML(menuItemData.submenu,level + 1);
}
ul += "</li>";
}
ul += "</ul>";
return ul;
}
Here is how the function is called initially: Code: buildMenuHTML(test,1); This is it's return value (with indentation added for readability): Code: <ul id='menu'>
<li><a href='menu1.html'>Menu 1</a>
<ul class='level2'>
<li><a href='menu1subitem1.html'>menu 1 subitem 1</a></li>
<li><a href='menu1subitem2.html'>menu 1 subitem 2</a></li>
</ul>
</li>
</ul>
'Menu 2' and 'Menu 3' don't show up! I'm sure it's something small that I'm overlooking, but any help would be appreciated. Hello, I am retrieving xml - that works well. It is when I use "getElementByID" that things go weird. I can scoop up the elements, but it gives me 4 copies of each. When I try to run thru the first one, it doesn't recognize it as an array. hmm. In otherwords.. lets say I do this. var test = somevars.getElementByID('shoes'); test then looks like this: [shoes shoes shoes shoes] If I click on each "object" (shoes) - then I get the FULL xml in each... so I figure, ok - I'll just grab the first and reiterate thru that. ie.. for y=1 etc.. test[0].length but that doesn't work. Do I have to then reach into the childNodes of this and grab the "shoes" elements? Not sure if I am explaining this correctly. this is what I have: Code:
function fireAjax(){
new Ajax.Request( flashconfig.genXML, {
method: 'get',
contentType: "application/xml",
onSuccess: function( transport ) {
var shoeTags = transport.responseXML.getElementsByTagName( 'shoes' );
var spotlightView = $H();
for( var b = 0; b < shoeTags.length; b++ ) {
$w('title description link linkName image').each( function(cs){
spotlightView[cs] = getNodeValue(shoeTags[b],cs);
});
builddisplay(displayModule, spotlightView);
}
so shoeTags does get an array, but each element/object actually has ALL the shoe items in it - but then repeats... for the other array positions. I tried just grabbing the ".first" or [0] like so, but that didn't work. var shoeTags = transport.responseXML.getElementsByTagName( 'shoes' ).first; or var shoeTags = transport.responseXML.getElementsByTagName( 'shoes' )[0] None of my getElementById (or other) references produce anything but "undefined." This occurs in the latest versions of Fx, IE, Chrome, and Safari, so it must be something I am doing but not not seeing here. I have boiled it down to the following without success, and wonder whether there is some add on interaction. Fx 3.6.12 has the problem with this code: <code> <html> <head> <title>This is a test of getElementById</title> </head> <body> <div id="area" name="area_name">xxx</div> <script type="text/javascript"> var divs = document.getElementsByTagName('div'); var msg = ''; msg = 'Divs[0] contains ' + divs[0] + ' with width = ' + divs[0].width + "\n"; msg +='Test area width by id = ' + document.getElementById('area').width + "\n"; msg +='Test area width by name = ' + document.getElementsByName('area_name').width; alert(msg); </script> </body> </html> </code> |
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