急、急、急--extjs动态创建控件--在线等！！

Question

小弟因项目需要，急要动态创建ext中的控件。
具体要求是：
在FormPanel中有一个textfield a，当在a中输入一个数字时，则在FormPanel中动态的创建a中对应数字个数的combobox控件。另外当a中数字大于1时，这时候该怎么样在FormPanel中进行布局。（注:原有的form是两列布局 ）
还请大虾帮个忙。万分感谢！！！

Answer 1

简单的说下思路吧 代码还是楼主自己动动手吧 这样受益的是自己监听textfield的keyup事件 当输入数字n时 调用panel的add方法 for循环创建n个combo add到panel中关于布局也好做 双列布局 我们可以把每一列都做一个panel layout是form 然后把combo分别往这两个panel中加
奇数的加左边panel 偶数的加右边panel  

Answer 2

大虾，现在我已经能够动态创建了。就是布局还有些问题。我现在的布局文件是这个样子的：
    var form = new Ext.FormPanel
    (
        {
            title: "合班处理",
            frame: true,
            layout: "form",     //ID nvcuserCode nvcpwd nvcisValid
            items: [                 //总体划分 上下两个部分
                                        {
                                        layout: "column",
                                        items: [
                                                    {         // 第一列
                                                        columnWidth: .5,
                                                        layout: "form",
                                                        xtype: "panel",
                                                        name:"leftform",
                                                        items: [
                                                                    KCMCTextField,
                                                                    APARTTextField
//                                                                    XKJSGHCmb,
//                                                                    SYJSGHCmb,
//                                                                    SJJSGHCmb
                                                                ]
                                                    },                                                    {         //第二列
                                                        columnWidth: .5,
                                                        layout: "form",
                                                        xtype:"panel",
                                                        name:"rightform",
                                                        items: [
                                                                    BJTextField
//                                                                    QTSKJSTextField,
//                                                                    FZZDGHCmb
                                                                ]
                                                    } //结束第二列                                                  ]
                                    }, SKDDBZTextArea, SKSJBZTextArea
                                      ],现在还不太布局一直有问题，还请指教啊

Answer 3

function createComBox(id,name) {
var c = new Ext.form.ComboBox({
mode : 'local',
forceSelection : true,
triggerAction : 'all',
displayField : 'name',
fieldLabel: name,
valueField : 'code',
idProperty : 'code',
fields : ['code', 'name'],
store : [],
id : id
})
return c;
} var form = new Ext.FormPanel({
title : "合班处理",
frame : true,
autoHeight : true,
applyTo : Ext.getBody(),
layout : "column",
items : [{
columnWidth : .5,
layout : "form",
id : 'left',
xtype : "panel",
name : "leftform",
items : [createComBox('dd','name1')] }, {
columnWidth : .5,
layout : "form",
xtype : "panel",
id : 'right',
name : "rightform",
items : [createComBox('ddd','name1')]
}] })
给你简单的写了点  在keyup事件中  调用那个createCombox方法（里边的东西你自己整整哈） 把id和name传进去 奇数的Ext.getCmp('left').add(新建的combox) 偶数的加右边