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<div id="hello">This is text!</div>​

<script>
jQuery(document).ready(function() {

    jQuery('#hello').bind('html-change-pre', function() {
        console.log('html-change-pre triggered', this, arguments);
    });
    
    jQuery('#hello').bind('html-change-post', function() {
        console.log('html-change-post triggered', this, arguments);
    });
    
    console.log('Calling html with 1 arg:');
    jQuery('#hello').html('This is text (that has been changed)!');
    console.log('Calling html with no args:');
    console.log(jQuery('#hello').html());
});​
</script>

// Redefines jQuery.fn.html() to add custom events that are triggered before and after a DOM element's innerHtml is changed
// html-change-pre is triggered before the innerHtml is changed
// html-change-post is triggered after the innerHtml is changed
;
(function($) {
    var eventName = 'html-change';
    // Save a reference to the original html function
    jQuery.fn.originalHtml = jQuery.fn.html;
    // Let's redefine the html function to include a custom event
    jQuery.fn.html = function() {
        var currentHtml = this.originalHtml();
        if(arguments.length) {
            this.trigger(eventName + '-pre', jQuery.merge([currentHtml], arguments));
            jQuery.fn.originalHtml.apply(this, arguments);
            this.trigger(eventName + '-post', jQuery.merge([currentHtml], arguments));
            return this;
        } else {
            return currentHtml;
        }
    }
})(jQuery);