108 lines
3.3 KiB
JavaScript
108 lines
3.3 KiB
JavaScript
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YAHOO.ext.tree.TreeLoader = function(config){
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this.baseParams = {};
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this.requestMethod = 'POST';
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YAHOO.ext.util.Config.apply(this, config);
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this.events = {
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'beforeload' : true,
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'load' : true,
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'loadexception' : true
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};
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};
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YAHOO.extendX(YAHOO.ext.tree.TreeLoader, YAHOO.ext.util.Observable, {
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load : function(node, callback){
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if(node.attributes.children){ // preloaded json children
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var cs = node.attributes.children;
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for(var i = 0, len = cs.length; i < len; i++){
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node.appendChild(this.createNode(cs[i]));
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}
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if(typeof callback == 'function'){
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callback();
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}
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}else if(this.dataUrl){
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this.requestData(node, callback);
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}
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},
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getParams: function(node){
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var buf = [], bp = this.baseParams;
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for(var key in bp){
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if(typeof bp[key] != 'function'){
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buf.push(encodeURIComponent(key), '=', encodeURIComponent(bp[key]), '&');
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}
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}
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buf.push('node=', encodeURIComponent(node.id));
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return buf.join('');
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},
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requestData : function(node, callback){
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if(this.fireEvent('beforeload', this, node, callback) !== false){
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var params = this.getParams(node);
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var cb = {
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success: this.handleResponse,
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failure: this.handleFailure,
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scope: this,
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argument: {callback: callback, node: node}
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};
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this.transId = YAHOO.util.Connect.asyncRequest(this.requestMethod, this.dataUrl, cb, params);
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}else{
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// if the load is cancelled, make sure we notify
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// the node that we are done
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if(typeof callback == 'function'){
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callback();
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}
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}
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},
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isLoading : function(){
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return this.transId ? true : false;
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},
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abort : function(){
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if(this.isLoading()){
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YAHOO.util.Connect.abort(this.transId);
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}
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},
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createNode : function(attr){
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if(this.applyLoader !== false){
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attr.loader = this;
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}
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return(attr.leaf ?
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new YAHOO.ext.tree.TreeNode(attr) :
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new YAHOO.ext.tree.AsyncTreeNode(attr));
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},
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processResponse : function(response, node, callback){
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var json = response.responseText;
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try {
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var o = eval('('+json+')');
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for(var i = 0, len = o.length; i < len; i++){
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node.appendChild(this.createNode(o[i]));
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}
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if(typeof callback == 'function'){
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callback();
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}
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}catch(e){
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this.handleFailure(response);
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}
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},
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handleResponse : function(response){
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this.transId = false;
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var a = response.argument;
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this.processResponse(response, a.node, a.callback);
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this.fireEvent('load', this, a.node, response);
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},
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handleFailure : function(response){
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this.transId = false;
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var a = response.argument;
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this.fireEvent('loadexception', this, a.node, response);
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if(typeof a.callback == 'function'){
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a.callback();
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}
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}
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});
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