Question

How to change IMG SRC from javascript

Asked by: mamuscia

I have the javascript code attached below in snippet section.  For some reason, this code will not change the image that is displayed.  I checked using firebug breakpoints and the IMG SRC is changed to the right value.  When the script ends, the image doesn't show at all in FF, and in IE it just shows the image placeholder with an X inside it.  Do I need to use a full qualified name for source?  My images are stored in the root directory in subdirectory IMAGES/xxxx.gif.  As you can see from my code, I've tried lots of different ways of changing the SRC attribute.  They all work and the attribute contains the new value.  I;m puzzled.  thanks

function showForumResp(id) {
    var plusImg = "images/dhtlmgoodies_plus.gif";
    var minusImg = "images/dhtlmgoodies_minus.gif";
    var myRdiv = eval("document.getElementById('respdiv"+id+"')");
    var myAlnk = eval("document.getElementById('resplnk"+id+"')");
    var myImg = eval("document.getElementById('respimg"+id+"')");
    alert("id: "+id+" objclass: "+myRdiv.className+" imgsrc: "+myImg.src);
    if (myRdiv.className == "showtext") {
         //eval("document.respimg"+id+".src = '"+plusImg+"'");
        //myImg.setAttribute("src", "images/"+ plusImg);
        myImg.src = plusImg;
        //myImg.src.replace(minusImg, plusImg);
        myRdiv.className="hidetext";
    }else{
        //eval("document.respimg"+id+".src = '"+minusImg+"'");
        //myImg.setAttribute("src", "images/"+ minusImg);
        myImg.src = minusImg;
        //myImg.src.replace(plusImg, minusImg);
        myRdiv.className="showtext";
    }
    alert("id: "+id+" objclass: "+myRdiv.className+" imgsrc: "+myImg.src);
}

                                  
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Asked On
2008-03-28 at 20:16:03ID23278990
Tags

javascript

,

IE, FF

Topic

JavaScript

Participating Experts
2
Points
500
Comments
4

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Answers

 

by: hieloPosted on 2008-03-28 at 20:21:11ID: 21235407

>>and in IE it just shows the image placeholder
That means you are not specifying the right path.

>>Do I need to use a full qualified name for source
No, but you need to specify the correct PATH to the image. Most likely the path to your images is:
http://yousite.com/images/someimage.gif

in which case the correct path would be:
    var plusImg = "/images/dhtlmgoodies_plus.gif";
    var minusImg = "/images/dhtlmgoodies_minus.gif";

which basically boils down to the full path minus the domain

 

by: ruscompPosted on 2008-03-28 at 20:47:36ID: 21235453

Is the javascript file within a different directory than your site and/or images? Even though the webpage may be on the root level, if the javascript is within a folder, the relative path would start from there.
Ex:
Your Javascript file: "mysite.com/js/something.js"
Your image file: "mysite.com/img/someimage.bmp"
If you want to reference the image within the javascript using a relative path, it should be something like "../img/someimage.bmp", where the "../" should tell it to go back one root level. Otherwise, "img/someimage.bmp" would be interpreted as "mysite.com/js/img/someimage.bmp"

 

by: mamusciaPosted on 2008-03-30 at 09:52:42ID: 21241236

My root directory that I'm running the PHP file from is HTTP://Localhost/index.php
My javascript runs from HTTP://Localhost/javascript
My images are in HTTP://Localhost/images
I changed this to use "./images", "../images", "images/", and "/images".  When I put together a test page and used the same javascript code, but a simple HTML page, it works.  Any other ideas?  I'm baffled.

 

by: hieloPosted on 2008-03-30 at 12:20:24ID: 21241625

This:
"/images/plus.gif"

is the "safe" way to code the path to the images. Put this somewhere on your page
<img src="/images/plus.gif"> and if the permissions on the image are correct it will work. Based on this:
eval("document.getElementById('respimg"+id+"')");

perhaps the problem is due to javascript. BTW: you don't need eval. You can just use:
var myImg = document.getElementById('respimg'+id);

20120131-EE-VQP-002

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