Extjs 禁止使用键盘回退刷新

来源：互联网发布：centos debian ubuntu 编辑：程序博客网时间：2024/05/16 08:31

在 Extjs 开发中,我们需要屏蔽一些键盘按键,来避免用户在使用键盘操作的过程中不小心按到这些快捷键造成输入信息丢失等问题.

    Ext.onReady(function(){                      Ext.WindowMgr.zseed = 10000;                  Ext.QuickTips.init();                                      Ext.getDoc().on("contextmenu", function(e){                         e.stopEvent();                     });                                     if(document.addEventListener){                      document.addEventListener("keydown",maskBackspace, true);                  }else{                      document.attachEvent("onkeydown",maskBackspace);                  }                                    function maskBackspace(event){                      var event = event || window.event;  //标准化事件对象                      var obj = event.target || event.srcElement;                      var keyCode = event.keyCode ? event.keyCode : event.which ?                              event.which : event.charCode;                      if(keyCode == 8){                          if(obj!=null && obj.tagName!=null && (obj.tagName.toLowerCase() == "input"                                   || obj.tagName.toLowerCase() == "textarea")){                              event.returnValue = true ;                              if(Ext.getCmp(obj.id)){                                  if(Ext.getCmp(obj.id).readOnly) {                                      if(window.event)                                          event.returnValue = false ;  //or event.keyCode=0                                      else                                          event.preventDefault();   //for ff                                  }                              }                          }else{                              if(window.event)                                  event.returnValue = false ;   // or event.keyCode=0                              else                                  event.preventDefault();    //for ff                          }                      }                  }                                    var map = new Ext.KeyMap(document, [                  {                      key: [116], // F5                      fn: function(){ },                      stopEvent: true,                      scope: this                  },{                      key: [37,39,115], //方向键左,右,F4                      alt: true,                      fn: function(){ },                      stopEvent: true,                      scope: this                  }, {                      key: [82],  // ctrl + R                      ctrl: true,                      fn: function(){ },                      stopEvent: true,                      scope: this                  }]);                  map.enable();      });

禁止在IE8中使用 F5 刷新还需加上写列代码

    <body onkeydown="if(event.keyCode==116){event.keyCode=0;return false;}">