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252 lines
7.5 KiB
JavaScript
252 lines
7.5 KiB
JavaScript
/*
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Copyright (c) 2004-2011, The Dojo Foundation All Rights Reserved.
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Available via Academic Free License >= 2.1 OR the modified BSD license.
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see: http://dojotoolkit.org/license for details
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*/
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if(!dojo._hasResource["dojo.behavior"]){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
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dojo._hasResource["dojo.behavior"] = true;
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dojo.provide("dojo.behavior");
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dojo.behavior = new function(){
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// summary:
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// Utility for unobtrusive/progressive event binding, DOM traversal,
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// and manipulation.
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//
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// description:
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//
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// A very simple, lightweight mechanism for applying code to
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// existing documents, based around `dojo.query` (CSS3 selectors) for node selection,
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// and a simple two-command API: `dojo.behavior.add()` and `dojo.behavior.apply()`;
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//
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// Behaviors apply to a given page, and are registered following the syntax
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// options described by `dojo.behavior.add` to match nodes to actions, or "behaviors".
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//
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// Added behaviors are applied to the current DOM when .apply() is called,
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// matching only new nodes found since .apply() was last called.
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//
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function arrIn(obj, name){
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if(!obj[name]){ obj[name] = []; }
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return obj[name];
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}
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var _inc = 0;
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function forIn(obj, scope, func){
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var tmpObj = {};
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for(var x in obj){
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if(typeof tmpObj[x] == "undefined"){
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if(!func){
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scope(obj[x], x);
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}else{
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func.call(scope, obj[x], x);
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}
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}
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}
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}
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// FIXME: need a better test so we don't exclude nightly Safari's!
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this._behaviors = {};
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this.add = function(/* Object */behaviorObj){
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// summary:
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// Add the specified behavior to the list of behaviors, ignoring existing
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// matches.
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//
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// description:
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// Add the specified behavior to the list of behaviors which will
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// be applied the next time apply() is called. Calls to add() for
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// an already existing behavior do not replace the previous rules,
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// but are instead additive. New nodes which match the rule will
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// have all add()-ed behaviors applied to them when matched.
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//
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// The "found" method is a generalized handler that's called as soon
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// as the node matches the selector. Rules for values that follow also
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// apply to the "found" key.
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//
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// The "on*" handlers are attached with `dojo.connect()`, using the
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// matching node
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//
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// If the value corresponding to the ID key is a function and not a
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// list, it's treated as though it was the value of "found".
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//
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// dojo.behavior.add() can be called any number of times before
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// the DOM is ready. `dojo.behavior.apply()` is called automatically
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// by `dojo.addOnLoad`, though can be called to re-apply previously added
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// behaviors anytime the DOM changes.
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//
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// There are a variety of formats permitted in the behaviorObject
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//
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// example:
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// Simple list of properties. "found" is special. "Found" is assumed if
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// no property object for a given selector, and property is a function.
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//
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// | dojo.behavior.add({
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// | "#id": {
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// | "found": function(element){
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// | // node match found
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// | },
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// | "onclick": function(evt){
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// | // register onclick handler for found node
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// | }
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// | },
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// | "#otherid": function(element){
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// | // assumes "found" with this syntax
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// | }
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// | });
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//
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// example:
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// If property is a string, a dojo.publish will be issued on the channel:
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//
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// | dojo.behavior.add({
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// | // dojo.publish() whenever class="noclick" found on anchors
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// | "a.noclick": "/got/newAnchor",
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// | "div.wrapper": {
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// | "onclick": "/node/wasClicked"
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// | }
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// | });
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// | dojo.subscribe("/got/newAnchor", function(node){
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// | // handle node finding when dojo.behavior.apply() is called,
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// | // provided a newly matched node is found.
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// | });
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//
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// example:
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// Scoping can be accomplished by passing an object as a property to
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// a connection handle (on*):
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//
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// | dojo.behavior.add({
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// | "#id": {
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// | // like calling dojo.hitch(foo,"bar"). execute foo.bar() in scope of foo
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// | "onmouseenter": { targetObj: foo, targetFunc: "bar" },
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// | "onmouseleave": { targetObj: foo, targetFunc: "baz" }
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// | }
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// | });
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//
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// example:
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// Bahaviors match on CSS3 Selectors, powered by dojo.query. Example selectors:
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//
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// | dojo.behavior.add({
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// | // match all direct descendants
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// | "#id4 > *": function(element){
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// | // ...
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// | },
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// |
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// | // match the first child node that's an element
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// | "#id4 > :first-child": { ... },
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// |
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// | // match the last child node that's an element
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// | "#id4 > :last-child": { ... },
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// |
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// | // all elements of type tagname
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// | "tagname": {
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// | // ...
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// | },
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// |
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// | "tagname1 tagname2 tagname3": {
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// | // ...
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// | },
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// |
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// | ".classname": {
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// | // ...
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// | },
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// |
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// | "tagname.classname": {
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// | // ...
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// | }
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// | });
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//
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var tmpObj = {};
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forIn(behaviorObj, this, function(behavior, name){
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var tBehavior = arrIn(this._behaviors, name);
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if(typeof tBehavior["id"] != "number"){
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tBehavior.id = _inc++;
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}
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var cversion = [];
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tBehavior.push(cversion);
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if((dojo.isString(behavior))||(dojo.isFunction(behavior))){
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behavior = { found: behavior };
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}
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forIn(behavior, function(rule, ruleName){
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arrIn(cversion, ruleName).push(rule);
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});
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});
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};
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var _applyToNode = function(node, action, ruleSetName){
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if(dojo.isString(action)){
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if(ruleSetName == "found"){
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dojo.publish(action, [ node ]);
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}else{
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dojo.connect(node, ruleSetName, function(){
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dojo.publish(action, arguments);
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});
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}
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}else if(dojo.isFunction(action)){
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if(ruleSetName == "found"){
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action(node);
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}else{
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dojo.connect(node, ruleSetName, action);
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}
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}
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};
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this.apply = function(){
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// summary:
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// Applies all currently registered behaviors to the document.
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//
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// description:
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// Applies all currently registered behaviors to the document,
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// taking care to ensure that only incremental updates are made
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// since the last time add() or apply() were called.
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//
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// If new matching nodes have been added, all rules in a behavior will be
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// applied to that node. For previously matched nodes, only
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// behaviors which have been added since the last call to apply()
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// will be added to the nodes.
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//
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// apply() is called once automatically by `dojo.addOnLoad`, so
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// registering behaviors with `dojo.behavior.add` before the DOM is
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// ready is acceptable, provided the dojo.behavior module is ready.
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//
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// Calling appy() manually after manipulating the DOM is required
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// to rescan the DOM and apply newly .add()ed behaviors, or to match
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// nodes that match existing behaviors when those nodes are added to
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// the DOM.
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//
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forIn(this._behaviors, function(tBehavior, id){
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dojo.query(id).forEach(
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function(elem){
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var runFrom = 0;
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var bid = "_dj_behavior_"+tBehavior.id;
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if(typeof elem[bid] == "number"){
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runFrom = elem[bid];
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if(runFrom == (tBehavior.length)){
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return;
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}
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}
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// run through the versions, applying newer rules at each step
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for(var x=runFrom, tver; tver = tBehavior[x]; x++){
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forIn(tver, function(ruleSet, ruleSetName){
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if(dojo.isArray(ruleSet)){
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dojo.forEach(ruleSet, function(action){
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_applyToNode(elem, action, ruleSetName);
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});
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}
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});
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}
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// ensure that re-application only adds new rules to the node
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elem[bid] = tBehavior.length;
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}
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);
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});
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};
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};
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dojo.addOnLoad(dojo.behavior, "apply");
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}
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