Ext实现简单计算器

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使用Ext实现简单计算器，网页版实现
1、页面部分calculator.jsp
 
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
 
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>基于ExtJS的计算器</title>
    
    <link rel="stylesheet" type="text/css" href="<%=basePath%>js/resources/css/ext-all.css">
    <script type="text/javascript" src="<%=basePath%>js/ext-debug.js"></script>
    <script type="text/javascript" src="<%=basePath%>js/ext-all-debug.js"></script>
    <script type="text/javascript" src="<%=basePath%>js/jquery-1.9.0.js"></script>
    <script type="text/javascript">
    $(document).ready(function(){
    //$("#block").hide();
        $("#btn").click(function(){
            $("#block").toggle();
        });
    });
    Ext.onReady( function () {
    
        Ext.create("Ext.Button", {
            renderTo: Ext.get("btn"),
            text: "计算器",
            allowDepress: true,     //是否允许按钮被按下的状态
            enableToggle: true,     //是否允许按钮在弹起和按下两种状态中切换
            id: "bt1"
        });
      
         new Ext.dd.DDProxy('block');//定义面板可以任意拖动
             //Ext.Msg.alert('提示', '执行方法 Ext.onReady()');//测试ext能否使用
             var  calPanel =  new  Ext.panel.Panel({ //定义面板
                title: '计算器' , //标题
                renderTo:'block', //将显示指向页面的body
                bodyPadding:5, //设置间隔
                width:270, //面板宽度
                closable:true,//定义面板的关闭按钮，默认是false
                layout:{
                    type: 'table' ,
                    columns:5 //设置表格布局默认列数为4列
                },
                frame: true ,
                tbar:[
                     '公式：' ,
                     new  Ext.form.field.Text({
                        id: 'expression' ,
                        readOnly: true ,
                        style: 'text-align:right'
                    }),
                     '=' ,
                     new  Ext.form.field.Text({
                        id: 'result' ,
                        width:60
                    })
                ],
                defaultType: 'button' ,
                defaults:{
                    minWidth:50,
                    handler:btnClick
                },
                items:[  //定义按钮
                    {text: '1' ,symbol: '1' },
                    {text: '2' ,symbol: '2' },
                    {text: '3' ,symbol: '3' },
                    {text: '(' ,symbol: '(' },
                    {text: ')' ,symbol: ')' },
                    {text: '4' ,symbol: '4' },
                    {text: '5' ,symbol: '5' },
                    {text: '6' ,symbol: '6' },
                    {text: '+' ,symbol: '+' },
                    {text: '-' ,symbol: '-' },
                    {text: '7' ,symbol: '7' },
                    {text: '8' ,symbol: '8' },
                    {text: '9' ,symbol: '9' },
                    {text: '*' ,symbol: '*' },
                    {text: '/' ,symbol: '/' },
                    {text: '0' ,symbol: '0' },
                    {text: '.' ,symbol: '.' },
                    {text: '=' ,symbol: '=' },
                    {text: 'C' ,symbol: 'clear' },
                    {text: 'back' ,symbol: 'back' }
                ]
            })
             var  expression = Ext.getCmp( 'expression' ); //取得id为expression的组件
             var  result = Ext.getCmp( 'result' ); //取得id为result的组件
             function  btnClick(btn){  //定义按钮事件
                 var  oldValue = expression.getValue();  //得到输入的值
                 if (btn.symbol ==  'back' ){  //如果选择后退键
                    oldValue = oldValue.subString(0,oldValue.length - 1);
                } else   if (btn.symbol ==  'clear' ){ //如果选择呢清除键
                    oldValue = '' ;
                    result.setValue( '' );
                } else   if (btn.symbol ==  '=' ){ //如果选择等于键
                    calculate();
                } 
                //else   if (btn.symbol ==  '.' ){ //如果选择小数点
                     //if (oldValue.indexOf( '.' ) != -1){
                       //  return ;
                    //}
                //} 
                else  {
                    oldValue += btn.symbol;
                }
                expression.setValue(oldValue);
            }
            
             function  calculate(){
                 var  str = expression.getValue();  //取得表达式的值
                 if (!Ext.isEmpty(str)){  //如果表达式的值不为空
                    Ext.Ajax.request({  //利用ajax异步调用
                        url: 'calAction.action' , //请求服务器的地址
                        method:'post',
                        params:{exp:str}, //请求参数
                        callback: function (options,success,response){ //回调函数
                             if (success){ //计算成功的话
                                result.setValue(response.responseText); //设置结果框的值
                            } else { //请求出错时，输出框显示erro r
                                result.setRawValue( 'error' );
                            }
                        }
                    })
                }
            }
        });  
    
    </script>
    
 
  </head>
  
  <body>
  <div id="btn" style="width: 20"></div>
  <div id="block" style="width: 270"></div>
  </body>
  </html>
页面形式如下：
 
 





posted @ 2013-12-12 15:29  Tim&Blog  阅读(1155)  评论(0)  编辑  收藏  举报