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Landing the new expando management code. Completely overhauls how data is associated with elements.

Browse Source 
Plugins will be most interested in:
- jQuery.data(elem) -> Unique ID for the element
- jQuery.data(elem, name) -> Named data store for the element
- jQuery.data(elem, name, value) -> Saves a value to the named data store
- jQuery.removeData(elem) -> Remove the expando and the complete data store
- jQuery.removeData(elem, name) -> Removes just this one named data store

jQuery's .remove() and .empty() automatically clean up after themselves. Once an element leaves a DOM document their events are no longer intact. Thus, statements like so:
{{{
  $("#foo").remove().appendTo("#bar");
}}}
should be written like so:
{{{
  $("#foo").appendTo("#bar");
}}}
in order to avoid losing the bound events.
This commit is contained in:
John Resig
2007-09-08 23:31:23 +00:00
parent 15a78f8fea
commit 3a4e1233aa
5 changed files with 108 additions and 47 deletions
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54
src/event.js
View File

@@ -41,36 +41,34 @@ jQuery.event = {
handler.type = parts[1];
// Init the element's event structure
if (!element.$events)
element.$events = {};
var events = jQuery.data(element, "events") || jQuery.data(element, "events", {});
if (!element.$handle)
element.$handle = function() {
// returned undefined or false
var val;
var handle = jQuery.data(element, "handle", function(){
// returned undefined or false
var val;
// Handle the second event of a trigger and when
// an event is called after a page has unloaded
if ( typeof jQuery == "undefined" || jQuery.event.triggered )
return val;
val = jQuery.event.handle.apply(element, arguments);
// Handle the second event of a trigger and when
// an event is called after a page has unloaded
if ( typeof jQuery == "undefined" || jQuery.event.triggered )
return val;
};
val = jQuery.event.handle.apply(element, arguments);
return val;
});
// Get the current list of functions bound to this event
var handlers = element.$events[type];
var handlers = events[type];
// Init the event handler queue
if (!handlers) {
handlers = element.$events[type] = {};
handlers = events[type] = {};
// And bind the global event handler to the element
if (element.addEventListener)
element.addEventListener(type, element.$handle, false);
element.addEventListener(type, handle, false);
else
element.attachEvent("on" + type, element.$handle);
element.attachEvent("on" + type, handle);
}
// Add the function to the element's handler list
@@ -85,7 +83,7 @@ jQuery.event = {
// Detach an event or set of events from an element
remove: function(element, type, handler) {
var events = element.$events, ret, index;
var events = jQuery.data(element, "events"), ret, index;
// Namespaced event handlers
if ( typeof type == "string" ) {
@@ -111,7 +109,7 @@ jQuery.event = {
// remove all handlers for the given type
else
for ( handler in element.$events[type] )
for ( handler in events[type] )
// Handle the removal of namespaced events
if ( !parts[1] || events[type][handler].type == parts[1] )
delete events[type][handler];
@@ -120,9 +118,9 @@ jQuery.event = {
for ( ret in events[type] ) break;
if ( !ret ) {
if (element.removeEventListener)
element.removeEventListener(type, element.$handle, false);
element.removeEventListener(type, jQuery.data(element, "handle"), false);
else
element.detachEvent("on" + type, element.$handle);
element.detachEvent("on" + type, jQuery.data(element, "handle"));
ret = null;
delete events[type];
}
@@ -130,8 +128,10 @@ jQuery.event = {
// Remove the expando if it's no longer used
for ( ret in events ) break;
if ( !ret )
element.$handle = element.$events = null;
if ( !ret ) {
jQuery.removeData( element, "events" );
jQuery.removeData( element, "handle" );
}
}
},
@@ -156,8 +156,8 @@ jQuery.event = {
data.unshift( this.fix({ type: type, target: element }) );
// Trigger the event
if ( jQuery.isFunction( element.$handle ) )
val = element.$handle.apply( element, data );
if ( jQuery.isFunction( jQuery.data(element, "handle") ) )
val = jQuery.data(element, "handle").apply( element, data );
// Handle triggering native .onfoo handlers
if ( !fn && element["on"+type] && element["on"+type].apply( element, data ) === false )
@@ -194,7 +194,7 @@ jQuery.event = {
var parts = event.type.split(".");
event.type = parts[0];
var c = this.$events && this.$events[event.type], args = Array.prototype.slice.call( arguments, 1 );
var c = jQuery.data(this, "events") && jQuery.data(this, "events")[event.type], args = Array.prototype.slice.call( arguments, 1 );
args.unshift( event );
for ( var j in c ) {