How do I store static content of a web page in a javascript variable?

This is what I am trying to accomplish: Get the static content of an开发者_开发技巧 'external' url and check it for certain keywords for example, "User Guide" or "page not found".

I tried to use Ajax, dojo.xhr etc., but they don't support cross domain. In my case it is an external url. Also, I cannot use jQuery.

I also looked at dojo.io.iframe but I couldn't find useful example to accomplish this.

A dojo.io.iframe example would be really helpful. Please help.

Thanks!

Modern browsers restrict the use of cross-domain scripting. If you're the maintainer of the server, read Access-Control-Allow-Origin to get knowledge on how to enable cross-site scripting on your website.

EDIT: To check whether an external site is down or not, you could use this method. That external site is required to have an image file. Most sites have a file called favicon.ico at their root directory.

Example, testing whether http://www.google.com/ is online or not.

var test = new Image();

//If you're sure that the element is not a JavaScript file
//var test = document.createElement("script");

//If you're sure that the external website is reliable, you can use:
//var test = document.createElement("iframe");

function rmtmp(){if(tmp.parentNode)tmp.parentNode.removeChild(tmp);}
function online(){
    //The website is likely to be up and running.
    rmtmp();
}
function offline(){
    //The file is not a valid image file, or the website is down.
    rmtmp();
    alert("Something bad happened.");
}
if (window.addEventListener){
    test.addEventListener("load", online, true);
    test.addEventListener("error", offline, true);
} else if(window.attachEvent){
    test.attachEvent("onload", online);
    test.attachEvent("onerror", offline);
} else {
    test.onload = online;
    test.onerror = offline;
}

test.src = "http://www.google.com/favicon.ico?"+(new Date).getTime();
 /* "+ (new Date).getTime()" is needed to ensure that every new attempt
    doesn't get a cached version of the image */
if(/^iframe|script$/i.test(test.tagName)){
    test.style.display = "none";
    document.body.appendChild(test);
}

This will only work with image resources. Read the comments to see how to use other sources.

Try this:

<script src="https://ajax.googleapis.com/ajax/libs/dojo/1.6.1/dojo/dojo.xd.js.uncompressed.js" type="text/javascript" djConfig="parseOnLoad:true"></script>

<script>
    dojo.require("dojo.io.script");
</script>

<script>
dojo.addOnLoad(function(){

  dojo.io.script.get({

    url: "http://badlink.google.com/",
    //url: "http://www.google.com/",

    load: function(response, ioArgs) {
        //if no (http) error, it means the link works
        alert("yes, the url works!")
    }

  });
});
</script>