javascript ExtJS 4 在创建时将数据加载到表单面板中。要捕捉哪个事件？
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ExtJS 4 Loading data into form panel on creation. Which event to catch?
提问by kurochenko
I'm stuck with populating Ext.form.Panelwith data in my MVC project. In Controller I want to load data from store into form. But I cannot access basic form via form panel.
我坚持Ext.form.Panel在我的 MVC 项目中填充数据。在控制器中，我想将存储中的数据加载到表单中。但我无法通过表单面板访问基本表单。
Form view
表单视图
Ext.define('Example.view.webitem.Form', {
extend: 'Ext.form.Panel',
alias: 'widget.webitemform',
renderTo: 'webstructure-form',
items: [{
xtype: 'fieldset',
title: 'Metadata',
items: [{
xtype: 'displayfield',
name: 'id',
fieldLabel: 'ID'
},
{
xtype: 'textfield',
name: 'name',
fieldLabel: 'Name'
}]
}],
buttons: [{
text: 'Load',
action: 'loaditem'
}]
});
Controller
控制器
Ext.define('Example.controller.WebItemsForm', {
extend: 'Ext.app.Controller',
stores: ['WebItemsForm'],
models: ['WebItem'],
views: ['webitem.Form'],
init: function() {
// This does not work. Data aren't loaded in store
this.control({
'webitemform': {
render: this.loadItem
}
});
// This works, but isn't userfriendly
this.control({
'webitemform button[action=loaditem]': {
click: this.loadItem
}
});
},
loadItem: function() {
var form = this.getWebItemForm().getForm();
var data = this.getStore('WebItemsForm').getAt(0);
form.loadRecord(data);
}
});
After clicking on Loadbutton, data are correctly loaded into form. But when I'm trying to catch Ext.form.Panel renderevent, store doesn't have data loaded.
单击Load按钮后，数据将正确加载到表单中。但是当我试图捕捉Ext.form.Panel render事件时，商店没有加载数据。
Uncaught TypeError: Cannot read property 'data' of undefined.
If I understand correctly, this is caused because load operation is asynchronous? How to load data on render event? Is there more suitable event?
如果我理解正确，这是因为加载操作是异步的吗？如何在渲染事件上加载数据？有没有更合适的活动？
采纳答案by Mchl
Afer the panel is rendered (afterrenderevent) check if store is is loaded yet (usally it will not be, unless panel's render has been deferred because it's in an inactive tab for example). If the test fails in the same event add loadlistener to the store, that will push data back to panel once it's ready.
渲染面板后（afterrender事件）检查商店是否已加载（通常不会加载，除非面板的渲染已被推迟，例如因为它位于非活动选项卡中）。如果测试在同一个事件中失败，将load侦听器添加到商店，一旦准备好，它将把数据推回面板。
