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禁止浏览器backspace键(退格键)时跳转页面(extjs,javascript)

Ext实现方式:

//方法一 var key = new Ext.KeyMap(document,{  key: 8,  fn: function(obj,e){   var type = e.target.type;   var readonly = e.target.readOnly;   if(type != ‘text‘ && type != ‘textarea‘ && type != ‘password‘){    //e.preventDefault();    e.stopEvent();   }   else if(readonly){    //e.preventDefault();    e.stopEvent();   }  },  scope: this });//方法二Ext.getDoc().on(‘keydown‘,function(e){      if(e.getKey() == 8 && e.getTarget().type ==‘text‘ && !e.getTarget().readOnly){                }else if(e.getKey() == 8 && e.getTarget().type ==‘textarea‘ && !e.getTarget().readOnly){             }else if(e.getKey() == 8){          e.preventDefault();      }  }); 

JavaScript实现方式:

function document.onkeydown()   {     if ((event.keyCode==8) ) //屏蔽退格删除键    {       if (window.event.srcElement.tagName.toUpperCase()!="INPUT" && window.event.srcElement.tagName.toUpperCase()!="TEXTAREA" && window.event.srcElement.tagName.toUpperCase()!="TEXT")      {        event.keyCode=0;         event.returnValue=false;      }     }   }  

 

禁止浏览器backspace键(退格键)时跳转页面(extjs,javascript)