3

My ExtJS button's handler is not invoked after clicking. Now the code looks like this.

Ext.define('EDS.view.selector.Container', {
    extend: 'Ext.form.Panel',
    alias : 'widget.selectorcontainer',

    title: 'Selector_V2',
    renderTo: 'input-div',
    layout: 'fit',
    height: '100%',

    items: [
            {
                xtype: 'tabpanel',
                defaults: {
                    bodyPadding: 10
                },
            }
    ],
    buttons: [
        {
            text: 'Reset',
            handler: function(){
                console.log("Reset");
                this.up('form').getForm().reset();
            }
        },
        {
            text: 'Add to constrain',
            handler: this.addConstrain,
        }
    ],

    /*
     * Logic for button "Add to constrain"
     * 
     * Adds an entry into the constrain list describing a person, cost center or an application
     */
    addConstrain: function(button, event){
        console.log('Add_to_constrain clicked');
    }
});

Originally this 'selectorcontainer' was put diretly in my app.js. But I extracted it into a stand-alone view. Before the extraction, it works perfect but now it is not working.

BTW, I've two buttons and the first "reset" works fine. So I'm wondering if there's anything wrong with "this.addConstrain" related to scoping.

4

2 回答 2

5

你是对的，这是一个范围问题—— this不是你定义的类；它Ext.define是调用函数时的范围（可能window）。有几种方法可以处理这个问题。最简单的（在我看来）是将您的处理程序更改为与您的重置处理程序类似的工作：

{
    text: 'Add to constrain',
    handler: function(btn, e) {
       //'this' is now the button
       this.up('selectorcontainer').addConstrain(btn, e);
    }
}

您还可以将按钮添加为initComponent函数的一部分，而不是将它们定义为Ext.define配置的一部分。

initComponent: function() {
    //'this' is now the selector container
    this.buttons = [{
        text: 'Reset',
        handler: function(){
            console.log("Reset");
            this.up('form').getForm().reset();
        }
    }, {
        text: 'Add to constrain',
        handler: this.addConstrain
    }];

    this.callParent();
}
于 2013-08-20T02:17:30.307 回答
4

设计课程的正确方法是这样的。在执行 callParent 之前将配置设置应用于对象。

Ext.define('EDS.view.selector.Container', {
    extend: 'Ext.form.Panel',
    alias : 'widget.selectorcontainer',

    title: 'Selector_V2',
    renderTo: 'input-div',
    layout: 'fit',
    height: '100%',

    initComponent: function() {

        Ext.applyIf(this, {

           items: [
               {
                   xtype: 'tabpanel',
                   defaults: {
                      bodyPadding: 10
                   }
               }
           ],
           buttons: [
               {
                  text: 'Reset',
                  scope: this,                 // <--- scope to form panel
                  handler: function(){
                     console.log("Reset");
                     this.getForm().reset();
                  }
               },
               {
                   text: 'Add to constrain',
                   scope : this,               // <--- scope to form panel
                   handler: this.addConstrain
               }
           ]
       });

       this.callParent(arguments);

  }
  /*
   * Logic for button "Add to constrain"
   * 
   * Adds an entry into the constrain list describing a person, cost center or an      application
   */
   addConstrain: function(button, event){
      console.log('Add_to_constrain clicked');
   }
});
于 2014-01-22T00:15:59.830 回答