在 Extjs 開發(fā)中,我們需要屏蔽一些鍵盤按鍵,來避免用戶在使用鍵盤操作的過程中不小心按到這些快捷鍵造成輸入信息丟失等問題.
代碼如下:
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; //標(biāo)準(zhǔn)化事件對象
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], //方向鍵左,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 刷新還需加上代碼 ：
代碼如下:
<body onkeydown="if(event.keyCode==116){event.keyCode=0;return false;}">