admin管理员组

文章数量:1345166

I have this code 

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);"

I like to verify the key before it display on the text

If the key is a number or a(,) or full stop(.) then accept the key else refuse it

Thanks

I have this code 

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);"

I like to verify the key before it display on the text

If the key is a number or a(,) or full stop(.) then accept the key else refuse it

Thanks

  • javascript
  • html
  • regex
  • onkeydown
Share Improve this question edited Sep 26, 2011 at 12:38 Pointy 414k62 gold badges595 silver badges629 bronze badges asked Sep 26, 2011 at 12:35 RadRad 4,9414 gold badges27 silver badges28 bronze badges 0
Add a ment  | 

1 Answer 1

Reset to default 7

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

<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>

本文标签： htmlHandle key using javascript onkeydownStack Overflow

版权声明：本文标题：html - Handle key using javascript onkeydown - Stack Overflow 内容由网友自发贡献，该文观点仅代表作者本人， 转载请联系作者并注明出处：http://www.betaflare.com/web/1743770288a2535998.html， 本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如发现本站有涉嫌抄袭侵权/违法违规的内容，一经查实，本站将立刻删除。