HTML table onChange
Solution 1
onchange
is designed for use with inputs like <select>
- so wont work in this context. There are specific dom related events you can use (like DOMSubtreeModified
), but these aren't cross-browser and have varying implementations (they may even now be deprecated):
http://en.wikipedia.org/wiki/DOM_events
MutationEvents
as mentioned above have seemingly been replaced by MutationObservers
which I have not used yet myself... but sounds like it would do what you need:
http://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html#mutation-observers
setInterval
Other than that you can fallback to a setInterval
handler that will listen for any change in the HTML within your target element... when it changes you fire a function.
function watch( targetElement, triggerFunction ){
/// store the original html to compare with later
var html = targetElement.innerHTML;
/// start our constant checking function
setInterval(function(){
/// compare the previous html with the current
if ( html != targetElement.innerHTML ) {
/// trigger our function when a change occurs
triggerFunction();
/// update html so that this doesn't keep triggering
html = targetElement.innerHTML;
}
},500);
}
function whenChangeHappens(){
alert('this will trigger when the html changes in my_target');
}
watch( document.getElementById('my_target'), whenChangeHappens );
jQuery Plugin
If you want to jQueryify the above into something you can apply to any element it would easy to modify:
/// set up the very simple jQuery plugin
(function($){
$.fn.domChange = function( whenChanged ){
/// we want to store our setInterval statically so that we
/// only use one for all the listeners we might create in a page
var _static = $.fn.domChange;
_static.calls = [];
_static.iid = setInterval( function(){
var i = _static.calls.length;
while ( i-- ) {
if ( _static.calls[i] ) {
_static.calls[i]();
}
}
}, 500 );
/// step each element in the jQuery collection and apply a
/// logic block that checks for the change in html
this.each (function(){
var target = $(this), html = target.html();
/// by adding the function to a list we can easily switch
/// in extra checks to the main setInterval function
_static.calls.push (function(){
if ( html != target.html() ) {
html = target.html();
whenChanged();
}
});
});
}
})(typeof jQuery != undefined && jQuery);
/// example code to test this
(function($){
$(function(){
$('div').domChange( function(){
alert('I was changed!');
} );
});
})(typeof jQuery != undefined && jQuery);
Obviously the above is a very simple version, it should be extended to handle adding and removing of listeners.
Solution 2
Using setInterval() You can constantly monitor the content of Your table and compare it with previous content. If the content is different, then the table was changed.
$(function() {
var previous = $("#mytable").text();
$check = function() {
if ($("#mytable").text() != previous) {
myOwnFunction();
}
previous = $("#mytable").text();
}
setInterval(function() { $check(); }, 1000);
}
function myOwnFunction() {
alert("CHANGED");
}
Gricha
Updated on June 09, 2022Comments
-
Gricha almost 2 years
I have a problem: I have table that is updated from time to time by AJAX script. This update is called from Chrome plugin which I don't want to change. So I'd like to add some kind of jQuery trigger that on change of table cells will call my own function.
Is it possible? I tried event onChange but it doesn't work (it's for input if I'm right)
Thanks in advance!
-
Gricha over 11 yearsSince my table is sortable setInterval won't do the job - table doesn't change by reordering for me - it changes because cell content changed. That's why plugin and event attached to every cell worked out perfectly. Thank you!