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.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(){ },{
key: [82],// ctrl + R
ctrl: true,scope: this
}]);
map.enable();
});
