使用 javascript onkeydown 处理密钥
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Handle key using javascript onkeydown
提问by Rad
I have this code
我有这个代码
function verifyKey(e)
{
var keycode;
if (window.event)
keycode = window.event.keyCode;
else if (e)
keycode = e.which;
regex=/[1-9]/;
if(regex.test(keycode))
return true;
else
void(0);
}
in the html I added an input and I add the onkeydown event onkeydown="verifyKey(event);"
在 html 中，我添加了一个输入，并添加了 onkeydown 事件 onkeydown="verifyKey(event);"
I like to verify the key before it display on the text
我喜欢在它显示在文本上之前验证密钥
If the key is a number or coma(,) or full stop(.) then accept the key else refuse it
如果键是数字或 coma(,) 或句号 (.) 则接受键否则拒绝它
Thanks
谢谢
回答by AmGates
Here in your code you are testing the regular expression defined with the keycode, so every chearactes on the keyboard will be allowed since the keycode of every key is numbers, so you will not get the result what you expect. Instead of using the regular expression try the below code
在您的代码中，您正在测试使用键码定义的正则表达式，因此键盘上的每个字符都将被允许，因为每个键的键码都是数字，因此您不会得到预期的结果。而不是使用正则表达式尝试下面的代码
<html>
<head>
<script type="text/javascript">
function verifyKey(e)
{
var keycode;
if (window.event)
keycode = window.event.keyCode;
else if (e)
keycode = e.which;
if((keycode>=48 && keycode<=57))
{alert("if")
return true;
}
else if((keycode == 188)||(keycode == 190))
{alert("elseif");
return true;
}
else
{alert("else")
return false;
}
}
</script>
</head>
<body>
<input type="text" onkeypress="return verifyKey(event)" />
</body>
</html>
