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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
Show stats Download patch file Download diff file Expand all files Collapse all files

75
src/core.js
View file

@ -238,7 +238,7 @@ jQuery.fn = jQuery.prototype = {
var clone = ret.find("*").andSelf();
this.find("*").andSelf().each(function(i) {
var events = this.$events;
var events = jQuery.data(this, "events");
for ( var type in events )
for ( var handler in events[type] )
jQuery.event.add(clone[i], type, events[type][handler], events[type][handler].data);
@ -411,6 +411,8 @@ jQuery.extend = jQuery.fn.extend = function() {
return target;
};
var expando = "jQuery" + (new Date()).getTime(), uuid = 0;
jQuery.extend({
noConflict: function(deep) {
window.$ = _$;
@ -451,6 +453,58 @@ jQuery.extend({
return elem.nodeName && elem.nodeName.toUpperCase() == name.toUpperCase();
},
cache: {},
data: function( elem, name, data ) {
var id = elem[ expando ];
// Compute a unique ID for the element
if ( !id )
id = elem[ expando ] = ++uuid;
// Only generate the data cache if we're
// trying to access or manipulate it
if ( name && !jQuery.cache[ id ] )
jQuery.cache[ id ] = {};
// Prevent overriding the named cache with undefined values
if ( data != undefined )
jQuery.cache[ id ][ name ] = data;
// Return the named cache data, or the ID for the element
return name ? jQuery.cache[ id ][ name ] : id;
},
removeData: function( elem, name ) {
var id = elem[ expando ];
// If we want to remove a specific section of the element's data
if ( name ) {
// Remove the section of cache data
delete jQuery.cache[ id ][ name ];
// If we've removed all the data, remove the element's cache
name = "";
for ( name in jQuery.cache[ id ] ) break;
if ( !name )
jQuery.removeData( elem );
// Otherwise, we want to remove all of the element's data
} else {
// Clean up the element expando
try {
delete elem[ expando ];
} catch(e){
// IE has trouble directly removing the expando
// but it's ok with using removeAttribute
elem.removeAttribute( expando );
}
// Completely remove the data cache
delete jQuery.cache[ id ];
}
},
// args is for internal usage only
each: function( obj, fn, args ) {
if ( args ) {
@ -836,14 +890,16 @@ jQuery.extend({
},
unique: function(first) {
var r = [], num = jQuery.mergeNum++;
var r = [], done = {};
try {
for ( var i = 0, fl = first.length; i < fl; i++ )
if ( num != first[i].mergeNum ) {
first[i].mergeNum = num;
for ( var i = 0, fl = first.length; i < fl; i++ ) {
var id = jQuery.data(first[i]);
if ( !done[id] ) {
done[id] = true;
r.push(first[i]);
}
}
} catch(e) {
r = first;
}
@ -851,8 +907,6 @@ jQuery.extend({
return r;
},
mergeNum: 0,
grep: function(elems, fn, inv) {
// If a string is passed in for the function, make a function
// for it (a handy shortcut)
@ -977,10 +1031,15 @@ jQuery.each( {
jQuery.className[ jQuery.className.has(this,c) ? "remove" : "add" ](this, c);
},
remove: function(a){
if ( !a || jQuery.filter( a, [this] ).r.length )
if ( !a || jQuery.filter( a, [this] ).r.length ) {
jQuery.removeData( this );
this.parentNode.removeChild( this );
}
},
empty: function() {
// Clean up the cache
jQuery("*", this).each(function(){ jQuery.removeData(this); });
while ( this.firstChild )
this.removeChild( this.firstChild );
}

36
src/event.js
View file

@ -41,11 +41,9 @@ 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() {
var handle = jQuery.data(element, "handle", function(){
// returned undefined or false
var val;
@ -57,20 +55,20 @@ jQuery.event = {
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 ) {

16
src/selector.js
View file

@ -140,17 +140,19 @@ jQuery.extend({
if ( (m = re.exec(t)) != null ) {
r = [];
var nodeName = m[2], mergeNum = jQuery.mergeNum++;
var nodeName = m[2], merge = {};
m = m[1];
for ( var j = 0, rl = ret.length; j < rl; j++ ) {
var n = m == "~" || m == "+" ? ret[j].nextSibling : ret[j].firstChild;
for ( ; n; n = n.nextSibling )
if ( n.nodeType == 1 ) {
if ( m == "~" && n.mergeNum == mergeNum ) break;
var id = jQuery.data(n);
if ( m == "~" && merge[id] ) break;
if (!nodeName || n.nodeName.toUpperCase() == nodeName.toUpperCase() ) {
if ( m == "~" ) n.mergeNum = mergeNum;
if ( m == "~" ) merge[id] = true;
r.push( n );
}
@ -346,23 +348,23 @@ jQuery.extend({
// We can get a speed boost by handling nth-child here
} else if ( m[1] == ":" && m[2] == "nth-child" ) {
var num = jQuery.mergeNum++, tmp = [],
var merge = {}, tmp = [],
test = /(\d*)n\+?(\d*)/.exec(
m[3] == "even" && "2n" || m[3] == "odd" && "2n+1" ||
!/\D/.test(m[3]) && "n+" + m[3] || m[3]),
first = (test[1] || 1) - 0, last = test[2] - 0;
for ( var i = 0, rl = r.length; i < rl; i++ ) {
var node = r[i], parentNode = node.parentNode;
var node = r[i], parentNode = node.parentNode, id = jQuery.data(parentNode);
if ( num != parentNode.mergeNum ) {
if ( !merge[id] ) {
var c = 1;
for ( var n = parentNode.firstChild; n; n = n.nextSibling )
if ( n.nodeType == 1 )
n.nodeIndex = c++;
parentNode.mergeNum = num;
merge[id] = true;
}
var add = false;

2
test/data/testrunner.js
View file

@ -161,7 +161,7 @@ function expect(asserts) {
* Resets the test setup. Useful for tests that modify the DOM.
*/
function reset() {
document.getElementById('main').innerHTML = _config.fixture;
$("#main").html( _config.fixture );
}
/**

6
test/unit/event.js
View file

@ -9,7 +9,7 @@ test("bind()", function() {
};
$("#firstp").bind("click", {foo: "bar"}, handler).click().unbind("click", handler);
ok( !$("#firstp").get(0).$events, "Event handler unbound when using data." );
ok( !jQuery.data($("#firstp")[0], "events"), "Event handler unbound when using data." );
reset();
var handler = function(event, data) {
@ -108,11 +108,11 @@ test("unbind(event)", function() {
el.click(function() { return; });
el.unbind('change',function(){ return; });
for (var ret in el[0].$events['click']) break;
for (var ret in jQuery.data(el[0], "events")['click']) break;
ok( ret, "Extra handlers weren't accidentally removed." );
el.unbind('click');
ok( !el[0].$events, "Removed the events expando after all handlers are unbound." );
ok( !jQuery.data(el[0], "events"), "Removed the events expando after all handlers are unbound." );
});
test("trigger(event, [data], [fn])", function() {