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Editorial Team
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Asked: 2026-05-20T14:47:11+00:00

lets say you set var $this = jQuery(this); how can you search the dom

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lets say you set var $this = jQuery(this); how can you search the dom for that element. $this.size() Does not work because it’s not searching the dom for that element. I need to basically detect if $this has been removed from the dom and stop an interval.

Update code requested:


    jQuery(document).find('div.ctalk').each(function(){
        var delay;
        var $this = this;

        activateLive = function($this) {


            clearInterval(delay);
            delay = setInterval(function(){

                if(jQuery($this).size() != '0') {

                    fn.actJSON('0', $this, 'update=1&');

                }else {
                    alert('kill it');
                    clearInterval(delay);
                }

            }, 10000 ); 

        }


        if(!jQuery(this).data('init')) {

            jQuery(this).data('init', '1'); 
            fn.activateBinds($this);
            activateLive($this);
        }

    });
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1 Answer

  1. Editorial Team

    This would probably be the first time I’ve advocated the use of .is() for anything, but it does make this quite a simple task:

    if (!$(this).parents().is("body")) {
    // Node has been disconnected
}

    You can swap "body" for "html" if you want to check nodes anywhere in the document.

    IE also has a proprietary sourceIndex property that would do the job with slightly better performance:

    if (this.sourceIndex == -1 || !$(this).parents().is("body")) {
    // Node has been disconnected
}

    Extra Update: I knew there was a couple of other methods for this, they were scratching at the back of my mind but I couldn’t quite remember. Modern browsers have the DOM Level 3 method .compareDocumentPosition(), so you can do the whole thing without jQuery if anyone ever needs to. 

    if (this.sourceIndex == -1 || document.compareDocumentPosition(this) & 0x01) {
    // Node has been disconnected
}

    The other method I was thinking of is IE’s .contains() method, which also works. However, using that would require a check that the function is defined first so it’s easier to just stick with sourceIndex.

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