how to get the caller element in href javascript f

问题:

I have an anchor tag element coming in the html like:

<a href="javascript:handleEvent(this, 'abc')"></a>

Now in the javascript function, I have written:

function handleEvent(sourceElement, txt) {
    console.log(sourceElement);
}

the consoled element is coming as the window in this case. I tried sourceElement.document.activeElement but it doesnt seem to work in chrome, where it is coming as body element.

I cannot change the structure of the anchor tag to 'onClick' function as this is coming from some other source. Is there some way to find the calling element in this scenario?

回答1:

The real answer here is to change the HTML, which you've said you can't do. I'd push back on that if you can. If you're writing the function, and the function name is in the HTML, how is it you can't change the HTML??

But if you really, really can't, you can update the DOM once it's loaded:

var list = document.querySelectorAll('a[href^="javascript:"]');
var x, link;
for (x = 0; x < list.length; ++x) {
    link = list[x];
    link.onclick = new Function(link.href.substring(11));
    link.href = "javascript:;";
}

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This is fairly naughty, as it uses the Function constructor (which is very much like eval), but if you trust the source of the HTML, that should be okay.

Or of course, if you don't have to use whatever was in the href to start with, just hook up your event handler in the code above and don't use new Function.

回答2:

try something like this, use jQuery

just select the link tag with your selector

        $(function(){
            var href = $('a').attr('href');
            href = href.replace('javascript:','');
            $('a').attr('href','#');
            $('a').attr('onclick',href);
        })

This is just workaround solution.

回答3:

If you have access to the js, you could do something like this:

document.addEventListener('DOMContentLoaded', function(){
    var link = document.querySelectorAll('a');
    link[0].addEventListener('click', function(e){
        console.log(e.target);
    });
});

With this, you would be just not be doing anything with the inline href event and just be appending your own handler.

回答4:

And if no other answer here works for you because you can't update the DOM after it's loaded (try doing any of them if you want to modify a squarespace lightbox - not saying it's impossible, but...), here's an out of the box thinking:

Sometimes there will be something hinting where the a href is. So you could use it.

<div class="hint current">
    <a href="javascript:handleEvent('.hint')">

In my case, I even knew the hint without needing a parameter, which made things even simpler:

function handleEvent (hint) {
    if(!hint) {
        hint = $("div.current");
    }
    hrefElement = $(hint).find('a[href^=javascript]');
}

This of course will make sense if your DOM is constantly being changed by a script you have no access to.

But even if there is nothing hinting on the a href, you still could do something like this:

<a href="javascript:var x=1;handleEvent(1)">

function handleEvent (uniqueId) {
    hrefElement = $('a[href^=javascript:var x='+uniqueId);
}