+++ /dev/null
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- <pre class="prettyprint lang-js">/*!
- * Ext JS Library 3.3.1
- * Copyright(c) 2006-2010 Sencha Inc.
- * licensing@sencha.com
- * http://www.sencha.com/license
- */
-<div id="cls-Ext.tree.TreeLoader"></div>/**
- * @class Ext.tree.TreeLoader
- * @extends Ext.util.Observable
- * A TreeLoader provides for lazy loading of an {@link Ext.tree.TreeNode}'s child
- * nodes from a specified URL. The response must be a JavaScript Array definition
- * whose elements are node definition objects. e.g.:
- * <pre><code>
- [{
- id: 1,
- text: 'A leaf Node',
- leaf: true
- },{
- id: 2,
- text: 'A folder Node',
- children: [{
- id: 3,
- text: 'A child Node',
- leaf: true
- }]
- }]
-</code></pre>
- * <br><br>
- * A server request is sent, and child nodes are loaded only when a node is expanded.
- * The loading node's id is passed to the server under the parameter name "node" to
- * enable the server to produce the correct child nodes.
- * <br><br>
- * To pass extra parameters, an event handler may be attached to the "beforeload"
- * event, and the parameters specified in the TreeLoader's baseParams property:
- * <pre><code>
- myTreeLoader.on("beforeload", function(treeLoader, node) {
- this.baseParams.category = node.attributes.category;
- }, this);
-</code></pre>
- * This would pass an HTTP parameter called "category" to the server containing
- * the value of the Node's "category" attribute.
- * @constructor
- * Creates a new Treeloader.
- * @param {Object} config A config object containing config properties.
- */
-Ext.tree.TreeLoader = function(config){
- this.baseParams = {};
- Ext.apply(this, config);
-
- this.addEvents(
- <div id="event-Ext.tree.TreeLoader-beforeload"></div>/**
- * @event beforeload
- * Fires before a network request is made to retrieve the Json text which specifies a node's children.
- * @param {Object} This TreeLoader object.
- * @param {Object} node The {@link Ext.tree.TreeNode} object being loaded.
- * @param {Object} callback The callback function specified in the {@link #load} call.
- */
- "beforeload",
- <div id="event-Ext.tree.TreeLoader-load"></div>/**
- * @event load
- * Fires when the node has been successfuly loaded.
- * @param {Object} This TreeLoader object.
- * @param {Object} node The {@link Ext.tree.TreeNode} object being loaded.
- * @param {Object} response The response object containing the data from the server.
- */
- "load",
- <div id="event-Ext.tree.TreeLoader-loadexception"></div>/**
- * @event loadexception
- * Fires if the network request failed.
- * @param {Object} This TreeLoader object.
- * @param {Object} node The {@link Ext.tree.TreeNode} object being loaded.
- * @param {Object} response The response object containing the data from the server.
- */
- "loadexception"
- );
- Ext.tree.TreeLoader.superclass.constructor.call(this);
- if(Ext.isString(this.paramOrder)){
- this.paramOrder = this.paramOrder.split(/[\s,|]/);
- }
-};
-
-Ext.extend(Ext.tree.TreeLoader, Ext.util.Observable, {
- <div id="cfg-Ext.tree.TreeLoader-dataUrl"></div>/**
- * @cfg {String} dataUrl The URL from which to request a Json string which
- * specifies an array of node definition objects representing the child nodes
- * to be loaded.
- */
- <div id="cfg-Ext.tree.TreeLoader-requestMethod"></div>/**
- * @cfg {String} requestMethod The HTTP request method for loading data (defaults to the value of {@link Ext.Ajax#method}).
- */
- <div id="cfg-Ext.tree.TreeLoader-url"></div>/**
- * @cfg {String} url Equivalent to {@link #dataUrl}.
- */
- <div id="cfg-Ext.tree.TreeLoader-preloadChildren"></div>/**
- * @cfg {Boolean} preloadChildren If set to true, the loader recursively loads "children" attributes when doing the first load on nodes.
- */
- <div id="cfg-Ext.tree.TreeLoader-baseParams"></div>/**
- * @cfg {Object} baseParams (optional) An object containing properties which
- * specify HTTP parameters to be passed to each request for child nodes.
- */
- <div id="cfg-Ext.tree.TreeLoader-baseAttrs"></div>/**
- * @cfg {Object} baseAttrs (optional) An object containing attributes to be added to all nodes
- * created by this loader. If the attributes sent by the server have an attribute in this object,
- * they take priority.
- */
- <div id="cfg-Ext.tree.TreeLoader-uiProviders"></div>/**
- * @cfg {Object} uiProviders (optional) An object containing properties which
- * specify custom {@link Ext.tree.TreeNodeUI} implementations. If the optional
- * <i>uiProvider</i> attribute of a returned child node is a string rather
- * than a reference to a TreeNodeUI implementation, then that string value
- * is used as a property name in the uiProviders object.
- */
- uiProviders : {},
-
- <div id="cfg-Ext.tree.TreeLoader-clearOnLoad"></div>/**
- * @cfg {Boolean} clearOnLoad (optional) Default to true. Remove previously existing
- * child nodes before loading.
- */
- clearOnLoad : true,
-
- <div id="cfg-Ext.tree.TreeLoader-paramOrder"></div>/**
- * @cfg {Array/String} paramOrder Defaults to <tt>undefined</tt>. Only used when using directFn.
- * Specifies the params in the order in which they must be passed to the server-side Direct method
- * as either (1) an Array of String values, or (2) a String of params delimited by either whitespace,
- * comma, or pipe. For example,
- * any of the following would be acceptable:<pre><code>
-nodeParameter: 'node',
-paramOrder: ['param1','param2','param3']
-paramOrder: 'node param1 param2 param3'
-paramOrder: 'param1,node,param2,param3'
-paramOrder: 'param1|param2|param|node'
- </code></pre>
- */
- paramOrder: undefined,
-
- <div id="cfg-Ext.tree.TreeLoader-paramsAsHash"></div>/**
- * @cfg {Boolean} paramsAsHash Only used when using directFn.
- * Send parameters as a collection of named arguments (defaults to <tt>false</tt>). Providing a
- * <tt>{@link #paramOrder}</tt> nullifies this configuration.
- */
- paramsAsHash: false,
-
- <div id="cfg-Ext.tree.TreeLoader-nodeParameter"></div>/**
- * @cfg {String} nodeParameter The name of the parameter sent to the server which contains
- * the identifier of the node. Defaults to <tt>'node'</tt>.
- */
- nodeParameter: 'node',
-
- <div id="cfg-Ext.tree.TreeLoader-directFn"></div>/**
- * @cfg {Function} directFn
- * Function to call when executing a request.
- */
- directFn : undefined,
-
- <div id="method-Ext.tree.TreeLoader-load"></div>/**
- * Load an {@link Ext.tree.TreeNode} from the URL specified in the constructor.
- * This is called automatically when a node is expanded, but may be used to reload
- * a node (or append new children if the {@link #clearOnLoad} option is false.)
- * @param {Ext.tree.TreeNode} node
- * @param {Function} callback Function to call after the node has been loaded. The
- * function is passed the TreeNode which was requested to be loaded.
- * @param {Object} scope The scope (<code>this</code> reference) in which the callback is executed.
- * defaults to the loaded TreeNode.
- */
- load : function(node, callback, scope){
- if(this.clearOnLoad){
- while(node.firstChild){
- node.removeChild(node.firstChild);
- }
- }
- if(this.doPreload(node)){ // preloaded json children
- this.runCallback(callback, scope || node, [node]);
- }else if(this.directFn || this.dataUrl || this.url){
- this.requestData(node, callback, scope || node);
- }
- },
-
- doPreload : function(node){
- if(node.attributes.children){
- if(node.childNodes.length < 1){ // preloaded?
- var cs = node.attributes.children;
- node.beginUpdate();
- for(var i = 0, len = cs.length; i < len; i++){
- var cn = node.appendChild(this.createNode(cs[i]));
- if(this.preloadChildren){
- this.doPreload(cn);
- }
- }
- node.endUpdate();
- }
- return true;
- }
- return false;
- },
-
- getParams: function(node){
- var bp = Ext.apply({}, this.baseParams),
- np = this.nodeParameter,
- po = this.paramOrder;
-
- np && (bp[ np ] = node.id);
-
- if(this.directFn){
- var buf = [node.id];
- if(po){
- // reset 'buf' if the nodeParameter was included in paramOrder
- if(np && po.indexOf(np) > -1){
- buf = [];
- }
-
- for(var i = 0, len = po.length; i < len; i++){
- buf.push(bp[ po[i] ]);
- }
- }else if(this.paramsAsHash){
- buf = [bp];
- }
- return buf;
- }else{
- return bp;
- }
- },
-
- requestData : function(node, callback, scope){
- if(this.fireEvent("beforeload", this, node, callback) !== false){
- if(this.directFn){
- var args = this.getParams(node);
- args.push(this.processDirectResponse.createDelegate(this, [{callback: callback, node: node, scope: scope}], true));
- this.directFn.apply(window, args);
- }else{
- this.transId = Ext.Ajax.request({
- method:this.requestMethod,
- url: this.dataUrl||this.url,
- success: this.handleResponse,
- failure: this.handleFailure,
- scope: this,
- argument: {callback: callback, node: node, scope: scope},
- params: this.getParams(node)
- });
- }
- }else{
- // if the load is cancelled, make sure we notify
- // the node that we are done
- this.runCallback(callback, scope || node, []);
- }
- },
-
- processDirectResponse: function(result, response, args){
- if(response.status){
- this.handleResponse({
- responseData: Ext.isArray(result) ? result : null,
- responseText: result,
- argument: args
- });
- }else{
- this.handleFailure({
- argument: args
- });
- }
- },
-
- // private
- runCallback: function(cb, scope, args){
- if(Ext.isFunction(cb)){
- cb.apply(scope, args);
- }
- },
-
- isLoading : function(){
- return !!this.transId;
- },
-
- abort : function(){
- if(this.isLoading()){
- Ext.Ajax.abort(this.transId);
- }
- },
-
- <div id="method-Ext.tree.TreeLoader-createNode"></div>/**
- * <p>Override this function for custom TreeNode node implementation, or to
- * modify the attributes at creation time.</p>
- * Example:<pre><code>
-new Ext.tree.TreePanel({
- ...
- loader: new Ext.tree.TreeLoader({
- url: 'dataUrl',
- createNode: function(attr) {
-// Allow consolidation consignments to have
-// consignments dropped into them.
- if (attr.isConsolidation) {
- attr.iconCls = 'x-consol',
- attr.allowDrop = true;
- }
- return Ext.tree.TreeLoader.prototype.createNode.call(this, attr);
- }
- }),
- ...
-});
-</code></pre>
- * @param attr {Object} The attributes from which to create the new node.
- */
- createNode : function(attr){
- // apply baseAttrs, nice idea Corey!
- if(this.baseAttrs){
- Ext.applyIf(attr, this.baseAttrs);
- }
- if(this.applyLoader !== false && !attr.loader){
- attr.loader = this;
- }
- if(Ext.isString(attr.uiProvider)){
- attr.uiProvider = this.uiProviders[attr.uiProvider] || eval(attr.uiProvider);
- }
- if(attr.nodeType){
- return new Ext.tree.TreePanel.nodeTypes[attr.nodeType](attr);
- }else{
- return attr.leaf ?
- new Ext.tree.TreeNode(attr) :
- new Ext.tree.AsyncTreeNode(attr);
- }
- },
-
- processResponse : function(response, node, callback, scope){
- var json = response.responseText;
- try {
- var o = response.responseData || Ext.decode(json);
- node.beginUpdate();
- for(var i = 0, len = o.length; i < len; i++){
- var n = this.createNode(o[i]);
- if(n){
- node.appendChild(n);
- }
- }
- node.endUpdate();
- this.runCallback(callback, scope || node, [node]);
- }catch(e){
- this.handleFailure(response);
- }
- },
-
- handleResponse : function(response){
- this.transId = false;
- var a = response.argument;
- this.processResponse(response, a.node, a.callback, a.scope);
- this.fireEvent("load", this, a.node, response);
- },
-
- handleFailure : function(response){
- this.transId = false;
- var a = response.argument;
- this.fireEvent("loadexception", this, a.node, response);
- this.runCallback(a.callback, a.scope || a.node, [a.node]);
- },
-
- destroy : function(){
- this.abort();
- this.purgeListeners();
- }
-});</pre>
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git.ithinksw.org / extjs.git / blobdiff