隐藏和显示项目

Question

我这次的问题是让一个项目出现并消失.我知道它完成了hide(),show()但我不知道怎么做？这是我的代码.当我选择"selectfield"中的"约会"时,我想让xtype出现:"datepickerfield"

App.views.Bankingrendezvous = Ext.extend(Ext.Panel, {

items: [{
xtype: 'formpanel',
id: 'form',
fullscreen: true,
scroll: 'vertical',
items: [{

       xtype: 'fieldset',
       title: 'Information & Appointment',
    },
    {
        xtype: 'selectfield',
        id: 'request',
        label: 'You need',
        options: [ 
        {   
            text: 'Appointment',
            value: 'Appointment'
        },
        {   
            text: 'Information',
            value: 'Information',

        }]



    },
    {
xtype: "datepickerfield",
id: "startDate",
label: "when",
picker: { yearFrom: 2012, yearTo: 2020} 

    },}]
     }]
     });
    Ext.reg('Bankingrendezvous', App.views.Bankingrendezvous);

---

谢谢.我试着说:

  {
xtype: "datepickerfield",
id: "startDate",
label: "when",
picker: { yearFrom: 2012, yearTo: 2020}
    this.items.getAt().hide();
 },

但它不起作用.

---

items: [{
xtype: 'formpanel',
 id: 'form',
fullscreen: true,
scroll: 'vertical',
items: [{

       xtype: 'fieldset',
       title: 'Information & Appointment',
    },
    {
        xtype: 'selectfield',
        id: 'request',
        label: 'You need',
        options: [ 
        {   
            text: 'Appointment',
            value: 'Appointment'
        },
        {   
            text: 'Information',
            value: 'Information',
        }],
     listeners: {
         function()
                  {
                    if (Ext.getCmp('request').getValue() == 'Information')
                      {
                        Ext.getCmp('startDate').hide();
                      }
                  }
               },


    },
     {
 xtype: "datepickerfield",
 id: 'startDate',
 label: "when",
 picker: { yearFrom: 2012, yearTo: 2020},        
      },

我试过这个,但它不起作用

Answer 1

您可以使用以下两种方法之一:hide()/show()或setVisible(true/false).

如果要访问对象内的项(例如,在initComponent()事件内),请使用以下子句:

this.items.getAt(<index of item>).hide();
this.items.getAt(<index of item>).show();

为了设置对类外的元素的访问,你可以使用getCmp()方法:

var el = Ext.getCmp("elementID");

然后访问该项目并设置其可见性.

el.items.getAt(<index of item>).setVisible(false); // hide
el.items.getAt(<index of item>).setVisible(true); // show