javascript - Most efficient method of detecting/monitoring DOM changes? -


i need efficient mechanism detecting changes dom. preferably cross-browser, if there's efficient means not cross browser, can implement these fail-safe cross browser method.

in particular, need detect changes affect text on page, new, removed or modified elements, or changes inner text (innerhtml) required.

i don't have control on changes being made (they due 3rd party javascript includes, etc), can't approached angle - need "monitor" changes somehow.

currently i've implemented "quick'n'dirty" method checks body.innerhtml.length @ intervals. won't of course detect changes result in same length being returned, in case "good enough" - chances of happening extremely slim, , in project, failing detect change won't result in lost data.

the problem body.innerhtml.length it's expensive. can take between 1 , 5 milliseconds on fast browser, , can bog things down lot - i'm dealing large-ish number of iframes , adds up. i'm pretty sure expensiveness of doing because innerhtml text not stored statically browsers, , needs calculated dom every time read.

the types of answers looking "precise" (for example event) "good enough" - perhaps "quick'n'dirty" innerhtml.length method, executes faster.

edit: should point out whilst "nice" detect precise element has been modified, not absolute necessity - fact there has been any change enough. broadens people's responses. i'm going investigate mutation events, still need fallback ie support, whacky, creative, outside-of-the-square ideas welcome.

http://www.quirksmode.org/js/events/domtree.html

jquery supports way attach events existing , future elements corresponding selector: http://docs.jquery.com/events/live#typefn

another interesting find - http://james.padolsey.com/javascript/monitoring-dom-properties/


Comments

Post a Comment

Popular posts from this blog

javascript - AngularJS custom datepicker directive -

i make custom datepicker directive custom template. but have no idea how start building it... how include date data directive? i appreciate guide or give me advice work on more precisely. it might you! follow below steps html code sample: <label>birth date</label> <input type="text" ng-model="birthdate" date-options="dateoptions" custom-datepicker/> <hr/> <pre>birthdate = {{birthdate}}</pre> <script type="text/ng-template" id="custom-datepicker.html"> <div class="enhanced-datepicker"> <div class="proxied-field-wrap"> <input type="text" ui-date-format="yy-mm-dd" ng-model="ngmodel" ui-date="dateoptions"/> </div> <label> <button class="btn" type="button"><i class="icon-calendar"></i>
Read more

javascript - jQuery date picker - Disable dates after the selection from the first date picker -

<!doctype html> <html lang="en"> <head> <meta charset="utf-8"> <title>jquery ui datepicker - default functionality</title> <link rel="stylesheet" href="//code.jquery.com/ui/1.11.4/themes/smoothness/jquery-ui.css"> <script src="//code.jquery.com/jquery-1.10.2.js"></script> <script src="//code.jquery.com/ui/1.11.4/jquery-ui.js"></script> <link rel="stylesheet" href="/resources/demos/style.css"> <script> $(function () { $("#datepicker1").datepicker(); }); </script> <script> $(function () { $("#datepicker2").datepicker(); }); </script> </head> <body> <p>date 1: <input type="text" id="datepicker1"></p> <p>date 2: <input type="t
Read more