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Wednesday, September 19, 2012

Change image onclick with jQuery

Learn how to change image when onclick event occurs (with help of jQuery). My previous article was about how to change image with onclick event with common javascript. This article is focused on doing the same thing but with jQuery.

First there will be one simple demonstration of changing image with onclick event with two buttons. Each button change image when clicked.

Second demonstration is how to change image when onclick event is happened on that image. So, image is changed every time user click on it.

Changing image after onclick event on button with jQuery

changing image when onclick event occurs

  

When "Show Undo" button is clicked arrow is pointed to left, when "Show Redo" is clicked image is changed to arrow pointed to left.

Let's take a look at code:


<p><img alt="" src="http://www.userinterfaceicons.com/80x80/redo.png" style="height: 85px; width: 198px" id="ChangeImage" />
</p>
     
<p><input id="Undo" type="button" value="Show undo" />&nbsp;&nbsp; <input id="Redo" type="button" value="Show Redo"  />
</p>


    <script src="http://jqueryjs.googlecode.com/files/jquery-1.3.2.min.js" type="text/javascript"></script>

    <script type="text/javascript">
        $(document).ready(function () {
            $("#Undo").click(function () {
                $('#ChangeImage').attr('src', 'http://www.userinterfaceicons.com/80x80/undo.png');
            });
            $("#Redo").click(function () {
                $('#ChangeImage').attr('src', 'http://www.userinterfaceicons.com/80x80/redo.png');
            });
        });
    </script>

Explanation of code for alternating image:

  • on the top there are HTML code for image and two buttons
    
    <p><img alt="" src="http://www.userinterfaceicons.com/80x80/redo.png" style="height: 85px; width: 198px" id="ChangeImage" />
    </p>
         
    <p><input id="Undo" type="button" value="Show undo" />&nbsp;&nbsp; <input id="Redo" type="button" value="Show Redo"  />
    </p>

  • to use jQuery we need to have a call to jQuery library
    
       <script src="http://jqueryjs.googlecode.com/files/jquery-1.3.2.min.js" type="text/javascript"></script>

  • the main part of jQuery code, two onclick events, when input Undo is clicked image with id "ChangeImage" is changed to Undo image.

  • when input Redo is clicked image with id "ChangeImage" is changed to Redo image
    
     <script type="text/javascript">
            $(document).ready(function () {
                $("#Undo").click(function () {
                    $('#ChangeImage').attr('src', 'http://www.userinterfaceicons.com/80x80/undo.png');
                });
                $("#Redo").click(function () {
                    $('#ChangeImage').attr('src', 'http://www.userinterfaceicons.com/80x80/redo.png');
                });
            });
        </script>
    

Alternate image when image is clicked with jQuery

When image below is clicked, image is changed.

Check code how to accomplish change image when onclick event is raised:


  <img src="http://www.userinterfaceicons.com/80x80/undo.png" class="img-swap" />

 <script src="http://jqueryjs.googlecode.com/files/jquery-1.3.2.min.js" type="text/javascript"></script>
    <script>
        $(function () {
            $(".img-swap").live("click", function () {
                if ($(this).attr("class") == "img-swap") {
                    this.src = this.src.replace("undo", "redo");
                } else {
                    this.src = this.src.replace("redo", "undo");
                }
                $(this).toggleClass("on");
            });
        });
     </script>

How this code is working?

  • first line is image with class "img-swap"

  • then there is a function which occurs when object with class "img-swap" is clicked

  • if clicked class is "img-swap" then "undo" is replaced with "redo" for src attribute, so the other image is showed

  • if clicked class is not "img-swap" then "redo" is replaced with "undo" for src attribute, so the other image is showed

  • at the end we have - $(this).toggleClass("on") - this code add "on" to class "img-swap" so we get class "img-swap on", on the second click with - $(this).toggleClass("on") - we get only "img-swap"

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