How do you add an onload event to an element?
Can I use:
<div onload="oQuickReply.swap();" ></div>
for this?
No, you can't. The easiest way to make it work would be to put the function call directly after the element
Example:
...
<div id="somid">Some content</div>
<script type="text/javascript">
oQuickReply.swap('somid');
</script>
...
or - even better - just in front of </body>:
...
<script type="text/javascript">
oQuickReply.swap('somid');
</script>
</body>
...so it doesn't block the following content from loading.
You can trigger some js automatically on an IMG element using onerror, and no src.
<img src onerror='alert()'>
The onload event can only be used on the document(body) itself, frames, images, and scripts. In other words, it can be attached to only body and/or each external resource. The div is not an external resource and it's loaded as part of the body, so the onload event doesn't apply there.
onload event it only supports with few tags like listed below.
<body>, <frame>, <iframe>, <img>, <input type="image">, <link>, <script>, <style>
Here the reference for onload event
Try this! And never use trigger twice on div!
You can define function to call before the div tag.
$(function(){
$('div[onload]').trigger('onload');
});
DEMO: jsfiddle
I just want to add here that if any one want to call a function on load event of div & you don't want to use jQuery(due to conflict as in my case) then simply call a function after all the html code or any other code you have written including the function code and
simply call a function .
/* All Other Code*/
-----
------
/* ----At the end ---- */
<script type="text/javascript">
function_name();
</script>
OR
/* All Other Code*/
-----
------
/* ----At the end ---- */
<script type="text/javascript">
function my_func(){
function definition;
}
my_func();
</script>
I needed to have some initialization code run after a chunk of html (template instance) was inserted, and of course I didn't have access to the code that manipulates the template and modifies the DOM. The same idea holds for any partial modification of the DOM by insertion of an html element, usually a <div>.
Some time ago, I did a hack with the onload event of a nearly invisible <img> contained in a <div>, but discovered that a scoped, empty style will also do:
<div .... >
<style scoped="scoped" onload="dosomethingto(this.parentElement);" > </style>
.....
</div>
Update(Jul 15 2017) -
The <style> onload is not supported in last version of IE. Edge does support it, but some users see this as a different browser and stick with IE. The <img> element seems to work better across all browsers.
<div...>
<img onLoad="dosomthing(this.parentElement);" src="data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACH5BAEAAAAALAAAAAABAAEAAAICRAEAOw==" />
...
</div>
To minimize the visual impact and resource usage of the image, use an inline src that keeps it small and transparent.
One comment I feel I need to make about using a <script>is how much harder it is to determine which <div> the script is near, especially in templating where you can't have an identical id in each instance that the template generates. I thought the answer might be document.currentScript, but this is not universally supported. A <script> element cannot determine its own DOM location reliably; a reference to 'this' points to the main window, and is of no help.
I believe it is necessary to settle for using an <img> element, despite being goofy. This might be a hole in the DOM/javascript framework that could use plugging.
Avoid using any interval-based methods (as they are not performant and accurate) and use MutationObserver targeting a parent div of dynamically loaded div for better efficiency.
Update: Here's a handy function I wrote. Use it like this:
onElementLoaded("div.some_class").then(()=>{}).catch(()=>{});
/**
*
* Wait for an HTML element to be loaded like `div`, `span`, `img`, etc.
* ex: `onElementLoaded("div.some_class").then(()=>{}).catch(()=>{})`
* #param {*} elementToObserve wait for this element to load
* #param {*} parentStaticElement (optional) if parent element is not passed then `document` is used
* #return {*} Promise - return promise when `elementToObserve` is loaded
*/
function onElementLoaded(elementToObserve, parentStaticElement) {
const promise = new Promise((resolve, reject) => {
try {
if (document.querySelector(elementToObserve)) {
console.log(`element already present: ${elementToObserve}`);
resolve(true);
return;
}
const parentElement = parentStaticElement
? document.querySelector(parentStaticElement)
: document;
const observer = new MutationObserver((mutationList, obsrvr) => {
const divToCheck = document.querySelector(elementToObserve);
if (divToCheck) {
console.log(`element loaded: ${elementToObserve}`);
obsrvr.disconnect(); // stop observing
resolve(true);
}
});
// start observing for dynamic div
observer.observe(parentElement, {
childList: true,
subtree: true,
});
} catch (e) {
console.log(e);
reject(Error("some issue... promise rejected"));
}
});
return promise;
}
Implementation details:
HTML:
<div class="parent-static-div">
<div class="dynamic-loaded-div">
this div is loaded after DOM ready event
</div>
</div>
JS:
var observer = new MutationObserver(function (mutationList, obsrvr) {
var div_to_check = document.querySelector(".dynamic-loaded-div"); //get div by class
// var div_to_check = document.getElementById('div-id'); //get div by id
console.log("checking for div...");
if (div_to_check) {
console.log("div is loaded now"); // DO YOUR STUFF!
obsrvr.disconnect(); // stop observing
return;
}
});
var parentElement = document.querySelector("parent-static-div"); // use parent div which is already present in DOM to maximise efficiency
// var parentElement = document // if not sure about parent div then just use whole 'document'
// start observing for dynamic div
observer.observe(parentElement, {
// for properties details: https://developer.mozilla.org/en-US/docs/Web/API/MutationObserverInit
childList: true,
subtree: true,
});
we can use MutationObserver to solve the problem in efficient way adding a sample code below
<!DOCTYPE html>
<html>
<head>
<title></title>
<style>
#second{
position: absolute;
width: 100px;
height: 100px;
background-color: #a1a1a1;
}
</style>
</head>
<body>
<div id="first"></div>
<script>
var callthis = function(element){
element.setAttribute("tabIndex",0);
element.focus();
element.onkeydown = handler;
function handler(){
alert("called")
}
}
var observer = new WebKitMutationObserver(function(mutations) {
mutations.forEach(function(mutation) {
for (var i = 0; i < mutation.addedNodes.length; i++)
if(mutation.addedNodes[i].id === "second"){
callthis(mutation.addedNodes[i]);
}
})
});
observer.observe(document.getElementById("first"), { childList: true });
var ele = document.createElement('div');
ele.id = "second"
document.getElementById("first").appendChild(ele);
</script>
</body>
</html>
In November 2019, I am seeking a way to create a (hypothetical) onparse EventListener for <elements> which don't take onload.
The (hypothetical) onparse EventListener must be able to listen for when an element is parsed.
Third Attempt (and Definitive Solution)
I was pretty happy with the Second Attempt below, but it just struck me that I can make the code shorter and simpler, by creating a tailor-made event:
let parseEvent = new Event('parse');
This is the best solution yet.
The example below:
Creates a tailor-made parse Event
Declares a function (which can be run at window.onload or any time) which:
Finds any elements in the document which include the attribute data-onparse
Attaches the parse EventListener to each of those elements
Dispatches the parse Event to each of those elements to execute the Callback
Working Example:
// Create (homemade) parse event
let parseEvent = new Event('parse');
// Create Initialising Function which can be run at any time
const initialiseParseableElements = () => {
// Get all the elements which need to respond to an onparse event
let elementsWithParseEventListener = document.querySelectorAll('[data-onparse]');
// Attach Event Listeners and Dispatch Events
elementsWithParseEventListener.forEach((elementWithParseEventListener) => {
elementWithParseEventListener.addEventListener('parse', updateParseEventTarget, false);
elementWithParseEventListener.dataset.onparsed = elementWithParseEventListener.dataset.onparse;
elementWithParseEventListener.removeAttribute('data-onparse');
elementWithParseEventListener.dispatchEvent(parseEvent);
});
}
// Callback function for the Parse Event Listener
const updateParseEventTarget = (e) => {
switch (e.target.dataset.onparsed) {
case ('update-1') : e.target.textContent = 'My First Updated Heading'; break;
case ('update-2') : e.target.textContent = 'My Second Updated Heading'; break;
case ('update-3') : e.target.textContent = 'My Third Updated Heading'; break;
case ('run-oQuickReply.swap()') : e.target.innerHTML = 'This <code><div></code> is now loaded and the function <code>oQuickReply.swap()</code> will run...'; break;
}
}
// Run Initialising Function
initialiseParseableElements();
let dynamicHeading = document.createElement('h3');
dynamicHeading.textContent = 'Heading Text';
dynamicHeading.dataset.onparse = 'update-3';
setTimeout(() => {
// Add new element to page after time delay
document.body.appendChild(dynamicHeading);
// Re-run Initialising Function
initialiseParseableElements();
}, 3000);
div {
width: 300px;
height: 40px;
padding: 12px;
border: 1px solid rgb(191, 191, 191);
}
h3 {
position: absolute;
top: 0;
right: 0;
}
<h2 data-onparse="update-1">My Heading</h2>
<h2 data-onparse="update-2">My Heading</h2>
<div data-onparse="run-oQuickReply.swap()">
This div hasn't yet loaded and nothing will happen.
</div>
Second Attempt
The First Attempt below (based on #JohnWilliams' brilliant Empty Image Hack) used a hardcoded <img /> and worked.
I thought it ought to be possible to remove the hardcoded <img /> entirely and only dynamically insert it after detecting, in an element which needed to fire an onparse event, an attribute like:
data-onparse="run-oQuickReply.swap()"
It turns out, this works very well indeed.
The example below:
Finds any elements in the document which include the attribute data-onparse
Dynamically generates an <img src /> and appends it to the document, immediately after each of those elements
Fires the onerror EventListener when the rendering engine parses each <img src />
Executes the Callback and removes that dynamically generated <img src /> from the document
Working Example:
// Get all the elements which need to respond to an onparse event
let elementsWithParseEventListener = document.querySelectorAll('[data-onparse]');
// Dynamically create and position an empty <img> after each of those elements
elementsWithParseEventListener.forEach((elementWithParseEventListener) => {
let emptyImage = document.createElement('img');
emptyImage.src = '';
elementWithParseEventListener.parentNode.insertBefore(emptyImage, elementWithParseEventListener.nextElementSibling);
});
// Get all the empty images
let parseEventTriggers = document.querySelectorAll('img[src=""]');
// Callback function for the EventListener below
const updateParseEventTarget = (e) => {
let parseEventTarget = e.target.previousElementSibling;
switch (parseEventTarget.dataset.onparse) {
case ('update-1') : parseEventTarget.textContent = 'My First Updated Heading'; break;
case ('update-2') : parseEventTarget.textContent = 'My Second Updated Heading'; break;
case ('run-oQuickReply.swap()') : parseEventTarget.innerHTML = 'This <code><div></code> is now loaded and the function <code>oQuickReply.swap()</code> will run...'; break;
}
// Remove empty image
e.target.remove();
}
// Add onerror EventListener to all the empty images
parseEventTriggers.forEach((parseEventTrigger) => {
parseEventTrigger.addEventListener('error', updateParseEventTarget, false);
});
div {
width: 300px;
height: 40px;
padding: 12px;
border: 1px solid rgb(191, 191, 191);
}
<h2 data-onparse="update-1">My Heading</h2>
<h2 data-onparse="update-2">My Heading</h2>
<div data-onparse="run-oQuickReply.swap()">
This div hasn't yet loaded and nothing will happen.
</div>
First Attempt
I can build on #JohnWilliams' <img src> hack (on this page, from 2017) - which is, so far, the best approach I have come across.
The example below:
Fires the onerror EventListener when the rendering engine parses <img src />
Executes the Callback and removes the <img src /> from the document
Working Example:
let myHeadingLoadEventTrigger = document.getElementById('my-heading-load-event-trigger');
const updateHeading = (e) => {
let myHeading = e.target.previousElementSibling;
if (true) { // <= CONDITION HERE
myHeading.textContent = 'My Updated Heading';
}
// Modern alternative to document.body.removeChild(e.target);
e.target.remove();
}
myHeadingLoadEventTrigger.addEventListener('error', updateHeading, false);
<h2>My Heading</h2>
<img id="my-heading-load-event-trigger" src />
use an iframe and hide it iframe works like a body tag
<!DOCTYPE html>
<html>
<body>
<iframe style="display:none" onload="myFunction()" src="http://www.w3schools.com"></iframe>
<p id="demo"></p>
<script>
function myFunction() {
document.getElementById("demo").innerHTML = "Iframe is loaded.";
}
</script>
</body>
</html>
Since the onload event is only supported on a few elements, you have to use an alternate method.
You can use a MutationObserver for this:
const trackElement = element => {
let present = false;
const checkIfPresent = () => {
if (document.body.contains(element)) {
if (!present) {
console.log('in DOM:', element);
}
present = true;
} else if (present) {
present = false;
console.log('Not in DOM');
}
};
const observer = new MutationObserver(checkIfPresent);
observer.observe(document.body, { childList: true });
checkIfPresent();
return observer;
};
const element = document.querySelector('#element');
const add = () => document.body.appendChild(element);
const remove = () => element.remove();
trackElement(element);
<button onclick="add()">Add</button>
<button onclick="remove()">Remove</button>
<div id="element">Element</div>
we can use all these tags with onload
<body>, <frame>, <frameset>, <iframe>, <img>, <input type="image">, <link>, <script> and <style>
eg:
function loadImage() {
alert("Image is loaded");
}
<img src="https://www.w3schools.com/tags/w3html.gif" onload="loadImage()" width="100" height="132">
I really like the YUI3 library for this sort of thing.
<div id="mydiv"> ... </div>
<script>
YUI().use('node-base', function(Y) {
Y.on("available", someFunction, '#mydiv')
})
See: http://developer.yahoo.com/yui/3/event/#onavailable
This is very simple solution and 100% working.
Just load an <img> tag inside the div or at last line of div, if you think you want to execute javascript, after loading all data in div.
As <img> tag supports onload event, so you can easily call javascript here like below:
<div>
<img onLoad="alert('Problem Solved');" src="data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACH5BAEAAAAALAAAAAABAAEAAAICRAEAOw==" />
</div>
This above image will show only a single Dot(.), which you even cant see normally.
Try it.
First to answer your question: No, you can't, not directly like you wanted to do so.
May be a bit late to answer, but this is my solution, without jQuery, pure javascript.
It was originally written to apply a resize function to textareas after DOM is loaded and on keyup.
Same way you could use it to do something with (all) divs or only one, if specified, like so:
document.addEventListener("DOMContentLoaded", function() {
var divs = document.querySelectorAll('div'); // all divs
var mydiv = document.getElementById('myDiv'); // only div#myDiv
divs.forEach( div => {
do_something_with_all_divs(div);
});
do_something_with_mydiv(mydiv);
});
If you really need to do something with a div, loaded after the DOM is loaded, e.g. after an ajax call, you could use a very helpful hack, which is easy to understand an you'll find it ...working-with-elements-before-the-dom-is-ready.... It says "before the DOM is ready" but it works brillant the same way, after an ajax insertion or js-appendChild-whatever of a div. Here's the code, with some tiny changes to my needs.
css
.loaded { // I use only class loaded instead of a nodename
animation-name: nodeReady;
animation-duration: 0.001s;
}
#keyframes nodeReady {
from { clip: rect(1px, auto, auto, auto); }
to { clip: rect(0px, auto, auto, auto); }
}
javascript
document.addEventListener("animationstart", function(event) {
var e = event || window.event;
if (e.animationName == "nodeReady") {
e.target.classList.remove('loaded');
do_something_else();
}
}, false);
I am learning javascript and jquery and was going through all the answer,
i faced same issue when calling javascript function for loading div element.
I tried $('<divid>').ready(function(){alert('test'}) and it worked for me. I want to know is this good way to perform onload call on div element in the way i did using jquery selector.
thanks
As all said, you cannot use onLoad event on a DIV instead but it before body tag.
but in case you have one footer file and include it in many pages. it's better to check first if the div you want is on that page displayed, so the code doesn't executed in the pages that doesn't contain that DIV to make it load faster and save some time for your application.
so you will need to give that DIV an ID and do:
var myElem = document.getElementById('myElementId');
if (myElem !== null){ put your code here}
I had the same question and was trying to get a Div to load a scroll script, using onload or load. The problem I found was that it would always work before the Div could open, not during or after, so it wouldn't really work.
Then I came up with this as a work around.
<body>
<span onmouseover="window.scrollTo(0, document.body.scrollHeight);"
onmouseout="window.scrollTo(0, document.body.scrollHeight);">
<div id="">
</div>
Link to open Div
</span>
</body>
I placed the Div inside a Span and gave the Span two events, a mouseover and a mouseout. Then below that Div, I placed a link to open the Div, and gave that link an event for onclick. All events the exact same, to make the page scroll down to bottom of page. Now when the button to open the Div is clicked, the page will jump down part way, and the Div will open above the button, causing the mouseover and mouseout events to help push the scroll down script. Then any movement of the mouse at that point will push the script one last time.
You could use an interval to check for it until it loads like this:
https://codepen.io/pager/pen/MBgGGM
let checkonloadDoSomething = setInterval(() => {
let onloadDoSomething = document.getElementById("onloadDoSomething");
if (onloadDoSomething) {
onloadDoSomething.innerHTML="Loaded"
clearInterval(checkonloadDoSomething);
} else {`enter code here`
console.log("Waiting for onloadDoSomething to load");
}
}, 100);
When you load some html from server and insert it into DOM tree you can use DOMSubtreeModified however it is deprecated - so you can use MutationObserver or just detect new content inside loadElement function directly so you will don't need to wait for DOM events
var ignoreFirst=0;
var observer = (new MutationObserver((m, ob)=>
{
if(ignoreFirst++>0) {
console.log('Element add on', new Date());
}
}
)).observe(content, {childList: true, subtree:true });
// simulate element loading
var tmp=1;
function loadElement(name) {
setTimeout(()=>{
console.log(`Element ${name} loaded`)
content.innerHTML += `<div>My name is ${name}</div>`;
},1500*tmp++)
};
loadElement('Michael');
loadElement('Madonna');
loadElement('Shakira');
<div id="content"><div>
You can attach an event listener as below. It will trigger whenever the div having selector #my-id loads completely to DOM.
$(document).on('EventName', '#my-id', function() {
// do something
});
Inthis case EventName may be 'load' or 'click'
https://api.jquery.com/on/#on-events-selector-data-handler
Here is a trick that worked for me,
you just need to put your div inside a body element
<body>
<!-- Some code here -->
<body onload="alert('Hello World')">
<div ></div>
</body>
<!-- other lines of code -->
</body>
Use the body.onload event instead, either via attribute (<body onload="myFn()"> ...) or by binding an event in Javascript. This is extremely common with jQuery:
$(document).ready(function() {
doSomething($('#myDiv'));
});
You cannot add event onload on div, but you can add onkeydown and trigger onkeydown event on document load
$(function ()
{
$(".ccsdvCotentPS").trigger("onkeydown");
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.2.3/jquery.min.js"></script>
<div onkeydown="setCss( );"> </div>`
Try this.
document.getElementById("div").onload = alert("This is a div.");
<div id="div">Hello World</div>
Try this one too. You need to remove . from oQuickReply.swap() to make the function working.
document.getElementById("div").onload = oQuickReplyswap();
function oQuickReplyswap() {
alert("Hello World");
}
<div id="div"></div>
I have a script on my website that translates the text contained within a span when the user mouses over an anchor, and it works just fine. However, browsers that do auto-translation seem to be grabbing the titles that get generated onmouseover and translating them as well, which defeats the purpose of the script. I have tried adding the property translate="no" to the generated text using JS (as seen below in Line 10) but I must be missing something, because it doesn't seem to be having an effect.
Please help?
JS:
$.each($("li"), function(i, elements) {
var links = elements.getElementsByTagName("a");
var article_title = elements.getElementsByClassName("article-title")[0];
$.each(links, function(j, link) {
var previous_title = article_title.innerHTML;
if (!$(link).is('.newspaper, .doi')) {
link.addEventListener("mouseover", function() {
$(article_title).fadeTo(150, 0.5, function() {
article_title.innerHTML = link.title;
$(article_title).prop('translate', 'no');
$(article_title).fadeTo(150, 1, function() {});
});
});
link.addEventListener("mouseout", function() {
$(article_title).fadeTo(150, 0.5, function() {
article_title.innerHTML = previous_title;
$(article_title).fadeTo(150, 1, function() {});
});
});
}
});
});
});
HTML:
<li>
[EN]
[ES]
<span class="article-title">This is an example</span>
</li>
First, are you sure that the script interprets
translate="no"
Property correctly? As in, it figures that this should not be translated? Maybe the code logic appears to be the culprit.
Second, try using .attr instead of .prop?
So I'm trying to make a code that allows me to change the image once I hover over it.
The initial code works. But I have 72 other images to go through with this feature. I'm trying to call each one individually so I don't have to repeat so much code.
I want a simple html code like
<img id="seal" src="img/seal/dantalion.png" onmouseover="rollover(dantalion)"
onmouseout="rollaway(dantalion)" />
<img id="seal" src="img/seal/vassago.png" onmouseover="rollover(vassago)"
onmouseout="rollaway(vassago)" />
Here is the code that works.
function rollover(img) {img.src = "img/seal/hover/vassago.png";}
function rollaway(img) {img.src = "img/seal/vassago.png";}
Here is what I want to do. Keep in mind please, I'm new to this sort of thing.
function rollover() {
dantalion.src = "img/seal/hover/dantalion.png";
vassago.src = "img/seal/hover/vassago.png";
}
function rollaway() {
dantalion.src = "img/seal/dantalion.png";
vassago.src = "img/seal/vassago.png";
}
How do I individually call the object in the HTML code?
This is a simple solution to your problem. On mouseover of the wrapper div #images we check if you are hovering an image and if so, update the image src with the hover url.
On mouseout or if you hover on a different image the images are reset back to the original src
var images = document.getElementById('images');
var prevEl;
function resetImages() {
if (prevEl) {
prevEl.src = prevEl.src.replace('/hover', '');
prevEl = null;
}
}
images.addEventListener('mouseover', function(e) {
resetImages();
if (e.target && e.target.nodeName == "IMG") {
prevEl = e.target;
e.target.src = e.target.src.replace('/seal', '/seal/hover');
}
});
images.addEventListener('mouseout', resetImages);
<div id="images">
<img src="img/seal/dantalion.png">
<img src="img/seal/vassago.png">
</div>
Here's an example using event delegation. I've tried to use only core JS APIs because you didn't mention any libraries but if you were using a library there's a good chance it would be able to do some of this for you.
document.body.addEventListener('mouseover', function(ev) {
var target = ev.target,
cls = target.classList;
if (!cls.contains('seal')) {
return;
}
cls.add('seal-over');
target.innerHTML = target.innerHTML.replace('/seal/', '/seal/hover/');
});
document.body.addEventListener('mouseout', function(ev) {
var target = ev.target,
cls = target.classList;
if (!cls.contains('seal')) {
return;
}
cls.remove('seal-over');
target.innerHTML = target.innerHTML.replace('/hover', '');
});
.seal {
border: 1px dotted #777;
height: 70px;
margin: 10px;
width: 200px;
}
.seal-over {
background: #eee;
}
<div class="seal">img/seal/dantalion.png</div>
<div class="seal">img/seal/vassago.png</div>
While my example changes the innerHTML you would change the src instead - I didn't have your images so I couldn't easily use img tags. The id attribute has to be unique so I've changed it to using a class instead. Adding the seal-over class isn't required, I just thought it made the example more interesting: you'd probably use a CSS :hover pseudo-class for that if this were real code.
One of many guides to delegation, you can find others with a quick search online:
https://davidwalsh.name/event-delegate
The idea is to add a single listener on an element higher up the tree. Events propagate up so you can react to events on descendent elements. The event target refers to the element on which the actual event occurred. The code checks whether this element is one of the elements we care about and then makes the changes accordingly.
I am dynamically loading content into part of a page using jQuery .load().
It is working well, but I am having trouble building a way for the user to navigate back to the original content after the new content has been loaded.
I have created a 'close' icon with css which exists on the new page which is loaded, but I am not sure how to set up the jQuery / JavaScript in order for it to navigate the user back to the original state of that part of the page.
This is the relevant js:
// pages to load
var loadLudwig = "lw.html";
$("#work a:first-child").click(function() {
$("#work").fadeTo('slow', 0, function() {
$("#work").load(loadLudwig, function(){
$("#work").fadeTo('slow', 1);
});
});
});
// (& this part is working fine)
The relevant HTML (on the original page) is like this (its a grid of images embedded within anchor tags):
<section id="work">
...img and svg stuff
</section>
I tried many variations of:
$("#close-button").click(function() {
$("#work").fadeTo('slow', 0, function () {
$("#work").load('home.html #work', function() {
$("#work").fadeTo('slow', 1);
});
});
});
but this loads the content very strangely / some of the original functionality of #work is lost.
How do I get my close button to navigate back to the original state of #work?
In the jquery documentation for .load() is stated that:
Script Execution
When calling .load() using a URL without a suffixed selector
expression, the content is passed to .html() prior to scripts being
removed. This executes the script blocks before they are discarded. If
.load() is called with a selector expression appended to the URL,
however, the scripts are stripped out prior to the DOM being updated,
and thus are not executed. An example of both cases can be seen below:
Here, any JavaScript loaded into #a as a part of the document will
successfully execute.
1. $( "#a" ).load( "article.html" );
However, in the following case, script blocks in the document being
loaded into #b are stripped out and not executed:
1. $( "#b" ).load( "article.html #target" );
This is a probable cause for lack of functionality.
I'd also look into event binding. In your code examples you're using .click but if you are loading content or you are creating elements on-the-fly you should be favoring .on(). This method delegates events instead of just binding them to a DOM node.
I'd recommend you reading the whole article.
EDIT:
Here is a quick n'dirty way of achieving the effect
// pages to load
var loadLudwig = "lw.html",
$ludwig,
$work = $('#work'),
$workContent = $work.children(),
$closeButton = $("#close-button");
$work.find('a:first-child').click(function() {
$work.fadeTo('slow', 0, function() {
//Here is the tricky part
//Detaching keeps all the jQuery data on the elements
$workContent.detach();
//The first time, load the content,
//if the content is already loaded
//append it to the container
if(!$ludwig){
$work.load(loadLudwig, function(){
//Save the content in a var
//so you can reuse it later
$ludwig = $work.children();
$work.fadeTo('slow', 1);
});
} else {
$ludwig.appendTo($work);
$work.fadeTo('slow', 1);
}
});
});
$closeButton.click(function() {
$work.fadeTo('slow', 0, function () {
//Remove the old content, don't worry
//because is stored in $ludwig
$work.children().detach();
//Instead of reloading the content, just
//attach the fragment again
$workContent.appentTo($work);
$work.fadeTo('slow', 1);
});
});
You probably need to save the html somewhere. For example:
// Top of file
var oldHTML = "";
// Lots of stuff...
$("#work a:first-child").click(function() {
$("#work").fadeTo('slow', 0, function() {
// Store the old html
oldHTML = $("#work").html();
$("#work").load(loadLudwig, function(){
$("#work").fadeTo('slow', 1);
});
});
});
// Code for the close button
$("#close-button").click(function() {
$("#work").fadeTo('slow', 0, function () {
$("#work").html(oldHTML).fadeIn("slow");
});
});
Alternatively, instead of replacing the html, you could create another child. Of course, you might have to slightly change your markup.
<section id="work">
<div id="oldHTML">
...img and svg stuff
</div>
<div id="newSection" style="display:none;">
</div>
</section>
Then replace $("#work") with $("#oldHTML") in your first piece of code like so:
$("#oldHTML a:first-child").click(function() {
$("#oldHTML").fadeTo('slow', 0, function() {
$("#oldHTML").hide();
$("#newSection").load(loadLudwig, function(){
$("#newSection").show().fadeTo('slow', 1);
});
});
});
// Code for the close button
$("#close-button").click(function() {
$("#newSection").fadeTo('slow', 0, function () {
$("#newSection").hide();
$("#work").fadeIn("slow");
});
});
i am trying to make a colour change when a button is clicked and i managed to do this however i want to change the colour of not just the main content container but more containers how do i do this?
function changeblackandwhite(objDivID) {
if(document.getElementById(objDivID).style.color=='black'){
document.getElementById(objDivID).style.color='white';
document.getElementById(objDivID).style.backgroundColor='black';
}
else if(document.getElementById(objDivID).style.color=='white'){
document.getElementById(objDivID).style.color='black';
document.getElementById(objDivID).style.backgroundColor = 'white';
}
else{
document.getElementById(objDivID).style.color='black';
document.getElementById(objDivID).style.backgroundColor='white';
}
}
<img src="images/colour.jpg" title="Change Text/Backgroud Colors">
There are dozens of ways you can accomplish this.
You could change the argument of your function to be an array of strings. You could also reduce the complexity of your function as well
<script type="text/javascript">
changeblackandwhite = function() {
for( var idx=0; idx < arguments.length; idx++) {
var tgtDiv= document.getElementById(arguments[i]);
if(tgtDiv.style.color=='black'){
tgtDiv.style.color='white';
tgtDiv.style.backgroundColor='black';
}
else{
tgtDiv.style.color='black';
tgtDiv.style.backgroundColor='white';
}
}
};
</script>
<img src="images/colour.jpg" title="Change Text/Backgroud Colors">
As another reader questioned - you can do this with jQuery in a single line.
With jQuery, you can declare the elements in question to have a class attribute.
Using jQuery, you can then do something like:
$('div.someClass').css({'color': 'black', 'background-color': 'white'});
The argument to jQuery can be a class based selector, an id based selector, or any other selector you choose.
If you are open to jquery and you assign 1 class in common with these two divs you can do the following:
This should get you started (see this jsfiddle): I changed the fiddle to include a neater solution where clicking on the button adds and removes classes on the containers which allows you to set multiple attributes including the text color in one quick call.
<div class='container'>
</div>
<div class='container'>
</div>
<button id="changeColor" type="button">Change Color </button>
<script type="text/javascript">
$(document).ready( function() {
$('#changeColor').click( function() {
if ($('.container').hasClass("blackContainer")){
$('.container').addClass("whiteContainer");
$('.container').removeClass("blackContainer");
} else {
$('.container').removeClass("whiteContainer");
$('.container').addClass("blackContainer");
}
});
});
</script>
//CSS
.blackContainer {
background-color: black;
color: white;
}
.whiteContainer {
background-color: white;
color: black;
}
I made a jsfiddle for you to play around with jsfiddle
I also did the javascript/jQuery in a similar way as the OP since it usually helps them understand.
As stated above, there are several different ways to do this, I've done but one.
The document.ready function sets up an event listener for the object to be clicked, most of the time this is how you'll see events coded. So when the link is clicked, it calls the function with the string name of the object the listener is for.
$(document).ready(function() {
$("#changeit").click(function(){
changeblackandwhite("Maincontainer");
})
});
After the event listener is assigned, it will call the function below when the link is clicked on.
// Here's your function, put the current color in a var, check if it's black
// if black, change colors, else make it black.
function changeblackandwhite(objDivID) {
var curColor = $("#" + objDivID).css("color");
if( curColor == 'rgb(0, 0, 0)'){
$("#"+objDivID).css({'color':'white','background-color':'black'});
} else {
$("#"+objDivID).css({'color':'black','background-color':'ghostwhite'});
}
}