How can I go through all external links in a div with javascript, adding (or appending) a class and alt-text?
I guess I need to fetch all objects inside the div element, then check if each object is a , and check if the href attributen starts with http(s):// (should then be an external link), then add content to the alt and class attribute (if they don't exist create them, if they do exists; append the wanted values).
But, how do I do this in code?
I think something like this could be a starting point:
var links = document.getElementsByTagName("a"); //use div object here instead of document
for (var i=0; i<links.length; i++)
{
if (links[i].href.substring(0, 5) == 'https')
{
links[i].setAttribute('title', 'abc');
links[i].setAttribute('class', 'abc');
links[i].setAttribute('className', 'abc');
}
}
you could also loop through all the A elements in the document, and check the parent to see if the div is the one you are looking for
This one is tested:
<style type="text/css">
.AddedClass
{
background-color: #88FF99;
}
</style>
<script type="text/javascript">
window.onload = function ()
{
var re = /^(https?:\/\/[^\/]+).*$/;
var currentHref = window.location.href.replace(re, '$1');
var reLocal = new RegExp('^' + currentHref.replace(/\./, '\\.'));
var linksDiv = document.getElementById("Links");
if (linksDiv == null) return;
var links = linksDiv.getElementsByTagName("a");
for (var i = 0; i < links.length; i++)
{
var href = links[i].href;
if (href == '' || reLocal.test(href) || !/^http/.test(href))
continue;
if (links[i].className != undefined)
{
links[i].className += ' AddedClass';
}
else
{
links[i].className = 'AddedClass';
}
if (links[i].title != undefined && links[i].title != '')
{
links[i].title += ' (outside link)';
}
else
{
links[i].title = 'Outside link';
}
}
}
</script>
<div id="Links">
<a name="_Links"></a>
<a href="/foo.asp">FOO</a>
<a href="ftp://FTP.org/FILE.zip">FILE</a>
<a href="http://example.com/somewhere.html">SomeWhere</a>
<a href="http://example.com/somewhere2.html" class="Gah">SomeWhere 2</a>
<a href="http://example.com/somewhere3.html" title="It goes somewhere">SomeWhere 3</a>
<a href="https://another-example.com/elsewhere.php?foo=bar">ElseWhere 1</a>
<a href="https://another-example.com/elsewhere.php?foo=boz" class="Doh">ElseWhere 2</a>
<a href="https://another-example.com/elsewhere.php?foo=rad" title="It goes elsewhere">ElseWhere 3</a>
<a href="deep/below/bar.asp">BAR</a>
<a href="javascript:ShowHideElement('me');">Show/Hide</a>
</div>
If you are on an account on a shared server, like http://big-server.com/~UserName/ , you might want to hard-code the URL to go beyond the top level. On the other hand, you might want to alter the RE if you want http://foo.my-server.com and http://bar.my-server.com marked as local.
[UPDATE] Improved robustness after good remarks...
I don't highlight FTP or other protocols, they probably deserve a distinct routine.
This can be accomplished pretty easily with Jquery . You would add this to the onload:
$("div a[href^='http']").each(function() {
$(this).attr("alt",altText);
var oldClassAttributeValue = $(this).attr("class");
if(!oldClassAttributeValue) {
$(this).attr("class",newClassAttributeValue);
}
});
You could modify this to add text. Class can also be modified using the css function.
My (non-framework) approach would be something along the lines of:
window.onload = function(){
targetDiv = document.getElementById("divName");
linksArray = targetDiv.getElementsByTagName("a");
for(i=0;i=linksArray.length;i++){
thisLink = linksArray[i].href;
if(thisLink.substring(4,0) = "http"){
linksArray[i].className += "yourcontent"; //you said append so +=
linksArray[i].alt += "yourcontent";
}
}
}
This is not tested but I would start like this and debug it from here.
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