捕获原型函数内的键码
我正在尝试在原型函数中捕获击键。
这是我的代码：
function txtBox(input) // pass textbox
{
this.id = "myTextbox";
this.txt = input
}
txtBox.prototype.init = function()
{
this.txt.bind("keyup",this.keyup);
}
txtBox.prototype.keyup= function(event)
{
alert("keycode: event.keyCode);
alert(this.id);
}
var myTxt = new txtBox($(#txt)); // create object
myTxt.init();
捕获有效，但问题是 keyup 在我的对象“外部”触发，这意味着 this.id 返回“未定义”，即使它是定义。
有谁知道如何保持一致性？
I'm trying to capture keystrokes inside my prototype function.
Here's my code:
function txtBox(input) // pass textbox
{
this.id = "myTextbox";
this.txt = input
}
txtBox.prototype.init = function()
{
this.txt.bind("keyup",this.keyup);
}
txtBox.prototype.keyup= function(event)
{
alert("keycode: event.keyCode);
alert(this.id);
}
var myTxt = new txtBox($(#txt)); // create object
myTxt.init();
Capturing works but the problem is that the keyup triggers "outside" my object, which means this.id returns "undefined" even though it was defined.
Does anyone know how to keep consistency with this?
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评论（2）
我尝试将您的代码复制粘贴到我的萤火虫中并在此页面上运行它（尽管将警报更改为console.log）。而且看起来效果很好。它捕获我选择的文本字段中的每个按键，但不捕获其他任何地方。
I tried copy pasting your code into my firebug and running it on this page (changed the alerts to console.log though). And it seems to work just fine. It captures every keydown in the textfield I selected, but not anywhere else.
我看到两个问题，假设您的脚本中有一个名为 "txt" 的实际标签，如下所示：
此行需要从 更改为
也
需要从 更改为
，
它会提醒您的文本框name，我不相信在 IE 中，您将能够按照您尝试更改 id 的方式来更改 id
this.id="textbox"Two problems I see, assuming you have an actual tag named "txt" in your script as so:
this line needs to be change from
to
also this needs to be changed from
to
and it will alert your textbox name, I dont believe in IE you will be able to change the id the way you're trying to change it doing
this.id="textbox"