329 lines
8.9 KiB
JavaScript
329 lines
8.9 KiB
JavaScript
(function( jQuery ) {
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var rbrace = /^(?:\{.*\}|\[.*\])$/,
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rmultiDash = /([a-z])([A-Z])/g;
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jQuery.extend({
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cache: {},
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// Please use with caution
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uuid: 0,
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// Unique for each copy of jQuery on the page
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// Non-digits removed to match rinlinejQuery
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expando: "jQuery" + ( jQuery.fn.jquery + Math.random() ).replace( /\D/g, "" ),
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// The following elements throw uncatchable exceptions if you
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// attempt to add expando properties to them.
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noData: {
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"embed": true,
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// Ban all objects except for Flash (which handle expandos)
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"object": "clsid:D27CDB6E-AE6D-11cf-96B8-444553540000",
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"applet": true
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},
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hasData: function( elem ) {
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elem = elem.nodeType ? jQuery.cache[ elem[jQuery.expando] ] : elem[ jQuery.expando ];
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return !!elem && !isEmptyDataObject( elem );
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},
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data: function( elem, name, data, pvt /* Internal Use Only */ ) {
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if ( !jQuery.acceptData( elem ) ) {
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return;
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}
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var internalKey = jQuery.expando, getByName = typeof name === "string", thisCache,
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// We have to handle DOM nodes and JS objects differently because IE6-7
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// can't GC object references properly across the DOM-JS boundary
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isNode = elem.nodeType,
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// Only DOM nodes need the global jQuery cache; JS object data is
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// attached directly to the object so GC can occur automatically
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cache = isNode ? jQuery.cache : elem,
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// Only defining an ID for JS objects if its cache already exists allows
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// the code to shortcut on the same path as a DOM node with no cache
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id = isNode ? elem[ jQuery.expando ] : elem[ jQuery.expando ] && jQuery.expando;
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// Avoid doing any more work than we need to when trying to get data on an
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// object that has no data at all
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if ( (!id || (pvt && id && !cache[ id ][ internalKey ])) && getByName && data === undefined ) {
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return;
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}
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if ( !id ) {
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// Only DOM nodes need a new unique ID for each element since their data
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// ends up in the global cache
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if ( isNode ) {
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elem[ jQuery.expando ] = id = ++jQuery.uuid;
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} else {
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id = jQuery.expando;
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}
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}
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if ( !cache[ id ] ) {
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cache[ id ] = {};
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// TODO: This is a hack for 1.5 ONLY. Avoids exposing jQuery
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// metadata on plain JS objects when the object is serialized using
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// JSON.stringify
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if ( !isNode ) {
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cache[ id ].toJSON = jQuery.noop;
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}
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}
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// An object can be passed to jQuery.data instead of a key/value pair; this gets
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// shallow copied over onto the existing cache
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if ( typeof name === "object" || typeof name === "function" ) {
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if ( pvt ) {
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cache[ id ][ internalKey ] = jQuery.extend(cache[ id ][ internalKey ], name);
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} else {
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cache[ id ] = jQuery.extend(cache[ id ], name);
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}
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}
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thisCache = cache[ id ];
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// Internal jQuery data is stored in a separate object inside the object's data
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// cache in order to avoid key collisions between internal data and user-defined
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// data
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if ( pvt ) {
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if ( !thisCache[ internalKey ] ) {
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thisCache[ internalKey ] = {};
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}
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thisCache = thisCache[ internalKey ];
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}
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if ( data !== undefined ) {
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thisCache[ jQuery.camelCase( name ) ] = data;
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}
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// TODO: This is a hack for 1.5 ONLY. It will be removed in 1.6. Users should
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// not attempt to inspect the internal events object using jQuery.data, as this
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// internal data object is undocumented and subject to change.
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if ( name === "events" && !thisCache[name] ) {
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return thisCache[ internalKey ] && thisCache[ internalKey ].events;
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}
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return getByName ?
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// Check for both converted-to-camel and non-converted data property names
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thisCache[ jQuery.camelCase( name ) ] || thisCache[ name ] :
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thisCache;
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},
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removeData: function( elem, name, pvt /* Internal Use Only */ ) {
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if ( !jQuery.acceptData( elem ) ) {
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return;
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}
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var internalKey = jQuery.expando, isNode = elem.nodeType,
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// See jQuery.data for more information
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cache = isNode ? jQuery.cache : elem,
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// See jQuery.data for more information
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id = isNode ? elem[ jQuery.expando ] : jQuery.expando;
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// If there is already no cache entry for this object, there is no
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// purpose in continuing
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if ( !cache[ id ] ) {
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return;
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}
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if ( name ) {
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var thisCache = pvt ? cache[ id ][ internalKey ] : cache[ id ];
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if ( thisCache ) {
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delete thisCache[ name ];
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// If there is no data left in the cache, we want to continue
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// and let the cache object itself get destroyed
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if ( !isEmptyDataObject(thisCache) ) {
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return;
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}
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}
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}
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// See jQuery.data for more information
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if ( pvt ) {
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delete cache[ id ][ internalKey ];
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// Don't destroy the parent cache unless the internal data object
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// had been the only thing left in it
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if ( !isEmptyDataObject(cache[ id ]) ) {
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return;
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}
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}
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var internalCache = cache[ id ][ internalKey ];
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// Browsers that fail expando deletion also refuse to delete expandos on
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// the window, but it will allow it on all other JS objects; other browsers
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// don't care
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if ( jQuery.support.deleteExpando || cache != window ) {
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delete cache[ id ];
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} else {
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cache[ id ] = null;
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}
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// We destroyed the entire user cache at once because it's faster than
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// iterating through each key, but we need to continue to persist internal
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// data if it existed
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if ( internalCache ) {
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cache[ id ] = {};
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// TODO: This is a hack for 1.5 ONLY. Avoids exposing jQuery
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// metadata on plain JS objects when the object is serialized using
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// JSON.stringify
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if ( !isNode ) {
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cache[ id ].toJSON = jQuery.noop;
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}
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cache[ id ][ internalKey ] = internalCache;
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// Otherwise, we need to eliminate the expando on the node to avoid
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// false lookups in the cache for entries that no longer exist
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} else if ( isNode ) {
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// IE does not allow us to delete expando properties from nodes,
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// nor does it have a removeAttribute function on Document nodes;
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// we must handle all of these cases
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if ( jQuery.support.deleteExpando ) {
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delete elem[ jQuery.expando ];
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} else if ( elem.removeAttribute ) {
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elem.removeAttribute( jQuery.expando );
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} else {
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elem[ jQuery.expando ] = null;
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}
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}
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},
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// For internal use only.
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_data: function( elem, name, data ) {
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return jQuery.data( elem, name, data, true );
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},
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// A method for determining if a DOM node can handle the data expando
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acceptData: function( elem ) {
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if ( elem.nodeName ) {
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var match = jQuery.noData[ elem.nodeName.toLowerCase() ];
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if ( match ) {
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return !(match === true || elem.getAttribute("classid") !== match);
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}
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}
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return true;
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}
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});
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jQuery.fn.extend({
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data: function( key, value ) {
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var data = null;
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if ( typeof key === "undefined" ) {
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if ( this.length ) {
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data = jQuery.data( this[0] );
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if ( this[0].nodeType === 1 ) {
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var attr = this[0].attributes, name;
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for ( var i = 0, l = attr.length; i < l; i++ ) {
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name = attr[i].name;
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if ( name.indexOf( "data-" ) === 0 ) {
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name = jQuery.camelCase( name.substring(5) );
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dataAttr( this[0], name, data[ name ] );
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}
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}
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}
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}
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return data;
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} else if ( typeof key === "object" ) {
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return this.each(function() {
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jQuery.data( this, key );
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});
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}
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var parts = key.split(".");
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parts[1] = parts[1] ? "." + parts[1] : "";
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if ( value === undefined ) {
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data = this.triggerHandler("getData" + parts[1] + "!", [parts[0]]);
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// Try to fetch any internally stored data first
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if ( data === undefined && this.length ) {
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data = jQuery.data( this[0], key );
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data = dataAttr( this[0], key, data );
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}
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return data === undefined && parts[1] ?
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this.data( parts[0] ) :
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data;
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} else {
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return this.each(function() {
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var $this = jQuery( this ),
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args = [ parts[0], value ];
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$this.triggerHandler( "setData" + parts[1] + "!", args );
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jQuery.data( this, key, value );
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$this.triggerHandler( "changeData" + parts[1] + "!", args );
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});
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}
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},
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removeData: function( key ) {
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return this.each(function() {
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jQuery.removeData( this, key );
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});
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}
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});
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function dataAttr( elem, key, data ) {
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// If nothing was found internally, try to fetch any
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// data from the HTML5 data-* attribute
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if ( data === undefined && elem.nodeType === 1 ) {
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var name = "data-" + key.replace( rmultiDash, "$1-$2" ).toLowerCase();
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data = elem.getAttribute( name );
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if ( typeof data === "string" ) {
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try {
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data = data === "true" ? true :
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data === "false" ? false :
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data === "null" ? null :
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!jQuery.isNaN( data ) ? parseFloat( data ) :
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rbrace.test( data ) ? jQuery.parseJSON( data ) :
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data;
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} catch( e ) {}
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// Make sure we set the data so it isn't changed later
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jQuery.data( elem, key, data );
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} else {
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data = undefined;
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}
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}
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return data;
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}
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// TODO: This is a hack for 1.5 ONLY to allow objects with a single toJSON
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// property to be considered empty objects; this property always exists in
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// order to make sure JSON.stringify does not expose internal metadata
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function isEmptyDataObject( obj ) {
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for ( var name in obj ) {
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if ( name !== "toJSON" ) {
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return false;
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}
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}
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return true;
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}
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})( jQuery );
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