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Change image onclick with div toggle

I have some code I'm working on that toggles a div of information depending on the user clicking an image. What I'm looking for is assistance in getting the image to swap when the user clicks, then to swap back when it's clicked again. The image should be changing to: https://casetest.blackboard.com/bbcswebdav/users/kas200/collapse.gif
I'm a newbie when it comes to coding with JS, so any help provided would be much appreciated!
<script type="text/javascript">
function toggleMe(a){
var e=document.getElementById(a);
if(!e)return true;
if(e.style.display=="none"){
e.style.display="block";
}
else{
e.style.display="none";
}
return true;
}
</script>
<input type="image" src="https://casetest.blackboard.com/bbcswebdav/users/kas200/expand.gif" onclick="return toggleMe('para1')" value="Toggle"><br>
<div id="para1" style="display:none">
This is my text for section 1!
</div>
<br>
<input type="image" src="https://casetest.blackboard.com/bbcswebdav/users/kas200/expand.gif" onclick="return toggleMe('para2')" value="Toggle"><br>
<div id="para2" style="display:none">
This is my text for section 2!
</div>
<br>
<input type="image" src="https://casetest.blackboard.com/bbcswebdav/users/kas200/expand.gif" onclick="return toggleMe('para3')" value="Toggle"><br>
<span id="para3" style="display:none">
This is my text for section 3!
</span>

You've got the right idea. What I did for this case was add an id to each image with the name of the div + _img -- grabbed that element the same way, then updated the src:
javascript
function toggleMe(a){
var e=document.getElementById(a);
var i=document.getElementById(a+'_img');
if(!e)return true;
if(e.style.display=="none"){
i.src="https://casetest.blackboard.com/bbcswebdav/users/kas200/collapse.gif"
e.style.display="block"
}
else{
i.src="https://casetest.blackboard.com/bbcswebdav/users/kas200/expand.gif"
e.style.display="none"
}
return true;
}
html
<input type="image" src="https://casetest.blackboard.com/bbcswebdav/users/kas200/expand.gif" onclick="return toggleMe('para1')" value="Toggle" id="para1_img"><br>
<div id="para1" style="display:none">
This is my text for section 1!
</div>
<br>
<input type="image" src="https://casetest.blackboard.com/bbcswebdav/users/kas200/expand.gif" onclick="return toggleMe('para2')" value="Toggle" id="para2_img"><br>
<div id="para2" style="display:none">
This is my text for section 2!
</div>
<br>
<input type="image" src="https://casetest.blackboard.com/bbcswebdav/users/kas200/expand.gif" onclick="return toggleMe('para3')" value="Toggle" id="para3_img"><br>
<span id="para3" style="display:none">
This is my text for section 3!
</span>
here's a working example: http://jsfiddle.net/8h4T7/1/

PURE CSS
There's no need to use JS.
Here you go with a simple HTML / CSS solution:
LIVE DEMO
<input id="_1" class="toggler" type="checkbox">
<label for="_1"></label>
<div>This is my text for section 1!</div>
CSS:
.toggler,
.toggler + label + div{
display:none;
}
.toggler + label{
background: url(https://casetest.blackboard.com/bbcswebdav/users/kas200/expand.gif);
position:relative;
display:inline-block;
width:11px;
height:11px;
}
.toggler:checked + label{
background: url(https://casetest.blackboard.com/bbcswebdav/users/kas200/collapse.gif);
}
.toggler:checked + label + div{
display: block;
}
The good part is that both your images are loaded in the browser so there won't happen an useless image request to the server (creating a time-gap) with no image visible (while it's loading).
As you can see the trick is to hide the checkbox and the div,
than using the :checked state you can do your tricks.
PURE JS
If you really want to play with JS than here's some changes to simplify the HTML markup:
<input type="image" src="https://casetest.blackboard.com/bbcswebdav/users/kas200/expand.gif" value="para1"><br>
<div id="para1" style="display:none">This is my text for section 1!</div>
Note that I've changed the useless value to something useful, and removed the unnecessary ID from your inputs. Also, I've removed the messy HTML inline onclick callers. They're hard to maintain in production.
The input value will now help us to target your ID containers.
var imgSRC = "//casetest.blackboard.com/bbcswebdav/users/kas200/";
function toggleFn(){
var tog = this.tog = !this.tog;
var targetEl = document.getElementById(this.value);
targetEl.style.display = tog ? "block" : "none";
this.src = imgSRC + (tog?"collapse":"expand") + ".gif";
}
var $para = document.querySelectorAll("[value^=para]");
for(var i=0; i<$para.length; i++) $para[i].addEventListener('click', toggleFn, false);
LIVE DEMO 1
Another JS version:
var imgSRC = "//casetest.blackboard.com/bbcswebdav/users/kas200/";
function toggleFn(){
var el = document.getElementById(this.value);
el.style.display = el.style.display=='none' ? "block" : "none";
this.src = imgSRC +(this.src.match('expand') ? "collapse" : "expand")+ ".gif";
}
var $para = document.querySelectorAll("[value^=para]");
for(var i=0; i<$para.length; i++) $para[i].addEventListener('click', toggleFn, false);
LIVE DEMO 2
jQuery VERSION
Having the exact same as above HTML this is the needed jQuery code:
var imgSRC = "//casetest.blackboard.com/bbcswebdav/users/kas200/";
$(':image[value^="para"]').click(function(){
var tog = this.tog = !this.tog;
$('#'+ this.value).fadeToggle(); // or use .slideToggle();
this.src = imgSRC + (tog?"collapse":"expand") + ".gif";
});
LIVE DEMO
The interesting part of the code above is the way we store the current state directly into the this element reference Object:
var tog = thistog = !this.tog;
and using a set negation we create the toggle state.
Instead, if you're familiar with the bitwise XOR operator you can use it (to achieve the same) like:
var tog = this.t ^= 1;
XOR DEMO

Using jQuery
You can also use jQuery. It's a tool designed to help young coders. It allows manipulation of JavaScript through minimal functions.
Adding <script src="http://code.jquery.com/jquery-1.11.0.min.js"></script> to the head of your document will allow you to use jQuery. Then you can add some style to your collapsibles like this method based on pennstatephil's code.
function toggleMe(a){
var e=$('#'+a);
var i=$(a+'_img');
if(!e) return false;
if(e.css('display') == "none" ) {
i.attr('src', 'https://casetest.blackboard.com/bbcswebdav/users/kas200/collapse.gif');
e.fadeIn('slow');
}
else {
i.attr('src', 'https://casetest.blackboard.com/bbcswebdav/users/kas200/expand.gif');
e.fadeOut('fast');
}
return true;
}
And an example can be seen here
jQuery API Documentation can be found here

Javascript Hide/Show div not working

im having trouble running javascript hide/show div using CSS classes, when i click on the trigger nothing happens. The relevant codes are the following:
HTML
Click
<div id="test" class="hidden">
test
</div>
CSS
.hidden{
display:none;
}
JS
function toggleClass(eid, myclass) {
var theEle = document.getElementById(eid);
var eClass = theEle.className;
if (eClass.indexOf(myclass) >= 0) {
theEle.className = eClass.replace(myclass, "");
} else{
theEle.className += "" +myclass;
}
}

two issues: you missed a "#" for the href + ' for the test and hidden (must be strings):
Click
<div id="test" class="hidden">
test
</div>

im not 100% certain, but im pretty sure you need to enclose the arguments in quotation marks
Click
<div id="test" class="hidden">
test
</div>

get the size of label text inside the div?

I am trying to get the size of label text inside the div and chech of the size is 0 hide this div
Update the text is in dnn_ctr2802_View_lblHelp class dnnHelpText
javascript
$('.dnnTooltip').dnnTooltip();
//get the size of the hiden label
var labelTextSize = $(".dnnHelpText").val().length;
console.log("labelTextSize");
if(labelTextSize == 0)
{
$('.dnnTooltip').hide()
}
html
<div class="pull-right eyeball">
<img id="img_type" src="/ideaPark/DesktopModules/ExplorationTypeSaftyAlert/img/3.png" />
<img id="img_safety_alert" class="eyeball-warning" src="/ideaPark/DesktopModules/ExplorationTypeSaftyAlert/img/exploration-warning.png" />
</div>
<div class="dnnTooltip">
<label id="dnn_ctr2802_View_label">
<a id="dnn_ctr2802_View_cmdHelp" tabindex="-1" href="javascript:__doPostBack('dnn$ctr2802$View$cmdHelp','')"><span id="lblLabel"></span></a>
</label>
<div id="dnn_ctr2802_View_pnlHelp" class="dnnFormHelpContent dnnClear" style="display:none;">
<span id="dnn_ctr2802_View_lblHelp" class="dnnHelpText"> bnmbnmbnmbnmtfgjnfvyg</span>
</div>

try this & BTW try to use jquery UI function .remove()
var labelTextSize = $('.dnnHelpText').text().length;
console.log("text:" + labelTextSize.length);
if (labelTextSize == 1) {
$('.dnnTooltip').remove();
}

Try this:
var labelTextSize = $("#lblLabel").width();
And to test, try this:
console.log(labelTextSize);
UPDATE:
As anything worked I have search for other way to achieve this. I have found this question and maybe it works for you.
Try this:
$(".dnnHelpText").bind("DOMSubtreeModified", function(){
var labelTextSize = $(this).width();
if(labelTextSize == 0)
{
$('.dnnTooltip').hide()
}
});
That snipet add an event listener when the content of the label is been changed. So then, inside the event you may have access to it's properties to do your routine.

How do I toggle/collapse a javascript element (I want to collapse the html by default)

Hi I need help with my code to make the below html collapse because it does not collapse currently
This is the javascript function code
function(event, ui) {
html='';
var show = "Yes";
html += "<h5 id='collapsible'>"+ show +"</h5>";
};
$('#history').html(html);
Here is the html text code to show the Yes on the html page
<div id="history"></div>
Please help me Toggle/Collapse the <div id="history"></div>

If you're already using jQuery, you can simply use toggle():
$("#history").toggle();

You can use javascript method for this:
function toggle() {
var target = document.getElementById("history");
if(target.style.display == 'block'){
target.style.display = 'none';
}
else {
target.style.display = 'block';
}
To collapse the HTML by default, set the attribute:
<div id="history" style="display:none;"></div>

Javascript:
$('#collapseHistory').on('click', function(){
$("#history").toggle();
});
HTML:
<div id="history" style="display: none;"></div>
<div id="collapseHistory">Show/Hide</div>
This should work

jQuery Version:
http://www.codepen.io/anon/pen/xBdkl
<div id="temp" onClick="javascript:func()">Show/Hide</div>
<p/>
<div id="history"></div>
<script>
var html='';
var show = "Yes";
html += "<h5 id='collapsible'>"+ show +"</h5>";
$('#history').html(html);
var func = function(){
if($("#history").is(":visible")){
$('#history').hide();
}else{
$('#history').show();
}
}
</script>

click on image and change a text

U have 2 images on a page and a textbox (php)
When u click on the image i want to change the text.
I am a starter, please sent a code that isn't to hard to understand.
<body>
<img src="bier1.jpg" alt="u mad" onclick= "">
<img src="bier2.jpg" alt="u mad" onclick= ""><br>
<form>
<input type="text" name="Example"/>
</form>
</body>

Are I'm right that you want to change the text of the Textbox? If yes here's the code:
<body>
<img src="bier1.jpg" alt="u mad" onclick= "document.forms[0].elements['Example'].value = 'Image 1'">
<img src="bier2.jpg" alt="u mad" onclick= "document.forms[0].elements['Example'].value = 'Image 2'"><br>
<form>
<input type="text" name="Example"/>
</form>
</body>

You'll need to use Javascript, I prefer to give javascript code using jQuery, so please do a quick Google search on jQuery.
<script type="text/javascript">
$(function(){
//You need to bind click events to your images and probably
$("img.has-message").click(function(){
var msg = $(this).attr("data-msg");
//get the message from that particular image
$("#text_box_id").attr("value",msg);
//changes the value of the text box to display the message
return false;
});
});
</script>
So you place this code in the <head></head> tag of your page
This code will work perfectly assuming you could change your HTML to look like so:
<body>
<img src="bier1.jpg" alt="u mad" class="has-message" data-msg="message to be displayed when the image is clicked">
<img src="bier2.jpg" alt="u mad" class="has-message" data-msg="message to be displayed when the image is clicked"><br>
<form>
<input type="text" id="text_box_id" name="Example"/>
</form>
</body>
Please remember that jQuery needs to have been included on your page for the above to work.

You need to first add id to the text field:
<input type="text" name="Example" id="myTextBox" />
Then you can do such thing:
<img src="bier1.jpg" alt="u mad" onclick="document.getElementById('myTextBox').value = this.alt;" />
<img src="bier2.jpg" alt="u mad" onclick="document.getElementById('myTextBox').value = this.alt;" />
This is not very elegant though, you have it applied to all images without having to change the markup, have such JavaScript:
window.onload = function() {
var oTextbox = document.getElementById('myTextBox');
for (var i = 0; i < document.images.length; i++) {
document.images[i].onclick = function() {
oTextbox.value = this.alt;
};
}
};
Live test case of above code.
You can also have the above code work only for certain images by applying a class to those images you want "clickable", for example:
<img src="bier1.jpg" alt="u mad" />
<img class="clickable" src="bier2.jpg" alt="u mad 2" />
To have only the second cause the textbox to change, have such code:
window.onload = function() {
var oTextbox = document.getElementById('myTextBox');
for (var i = 0; i < document.images.length; i++) {
var image = document.images[i];
if (image.className === "clickable" || image.className.indexOf("clickable ") >= 0 || image.className.indexOf(" clickable") >= 0) {
image.onclick = function() {
oTextbox.value = this.alt;
};
}
}
};​
Updated fiddle to demonstrate.

I am guessing they mean the page is served as a php page. I would do this purely in javascript. In pseudo code I would do the following.
Create function in javascript
Function looks up input using name
Function sets the text of the input to whatever you like (this could be based on which image was clicked
Id deffinately suggest looking at w3schools website which will give you lots of simple examples to get you started.
Also start basic and work your way up, if you cant get it all working at once, do it bit by bit, get your onclick to alert when you click it, then try setting the text once you knwo your onclicks are working.