How to check whether an image is present or not in a webpage using JavaScript

[parupudi]

can somebody help me in writing a code that checks a website for the presence of an image.

For example, If an image A.jpeg is used in a web page, then the java script file should check for the presence of the image. If not, it must return error message.

I wrote the code like this:

<SCRIPT language="JavaScript">
 
    if (A.gif)
    {
 
        window.location="http://www.google.com";
    }
 
}
else
    alert("There is no match");
 
</SCRIPT>

Can some experts guide me in solving this?

Thanks in advance..

Waiting for replies...

[ashsa]

Due to cross site scripting restrictions, I believe that this is achievable only if the page is in the same domain as that of your javascript file.

You can use the ajax object XmlHttpRequest to open a connection to the target url and get the response text to see if such an image is there in the source HTML. However, I am afraid this will not check if the image is physically present on the server as it gets only the html source of the page.

Hope that helps.