使用 jQuery 在多个浏览器上停止退格键
我试图阻止浏览器处理退格 keydown 事件，我正在使用 jQuery 库，所以我需要获取原始事件，但在某些浏览器上（至少是 Firefox）我得到尝试设置原始事件 keyCode = 0 时出现错误，它给出错误消息，指出该属性仅存在 getter。
function blockBackspace(event) {
var altKey = event.originalEvent.altKey;
var srcElementType = event.originalEvent.srcElement;
if( (altKey) || ((event.keyCode == 8) && (srcElementType != "text" && srcElementType != "textarea" && srcElementType != "password"))
|| ((event.ctrlKey) && ((event.keyCode == 78) || (event.keyCode == 82)) ) || (event.keyCode == 116) )
{
event.keyCode = 0;
event.returnValue = false;
event.originalEvent.keyCode = 0;
event.originalEvent.returnValue = false;
//sets process backspaceFlag to keep multiple handlers from removing text
processBackspace = true;
}
}
所以我不太确定下一步该做什么，我找到的每个解决方案都会产生更多问题。必须有解决这个问题的方法，否则其他文本区域（这就是我正在构建的）将无法工作。
I am attempting to stop a backspace keydown event from being handled by browsers, I'm using the jQuery library, so I need to get the original event, but on some browsers (Firefox at least) I get an error when trying to set the original events keyCode = 0, it gives and error saying that only a getter exists for that property.
function blockBackspace(event) {
var altKey = event.originalEvent.altKey;
var srcElementType = event.originalEvent.srcElement;
if( (altKey) || ((event.keyCode == 8) && (srcElementType != "text" && srcElementType != "textarea" && srcElementType != "password"))
|| ((event.ctrlKey) && ((event.keyCode == 78) || (event.keyCode == 82)) ) || (event.keyCode == 116) )
{
event.keyCode = 0;
event.returnValue = false;
event.originalEvent.keyCode = 0;
event.originalEvent.returnValue = false;
//sets process backspaceFlag to keep multiple handlers from removing text
processBackspace = true;
}
}
So I'm not exactly sure what to do next, every solution I find yields more problems. There must be ways around this problem or else other text areas (that's kind of what I'm building) would not work.
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评论（1）
你无法阻止事件的发生。一种替代方法是使用
beforeunload专有事件，询问用户是否确实想要退出页面。You can't stop the event from happening. One alternative is to use the
beforeunloadproprietary event that asks the user if they really want to exit the page.