验证文本字段是否为数字jQuery [英] Validate that text field is numeric usiung jQuery

问题描述

我有一个简单的问题-如果不为空，我想检查一个字段是否为整数.我没有使用任何其他插件，只是jQuery.我的代码如下:

I have a simple issue -- I would like to check a field to see if it's an integer if it is not blank. I'm not using any additional plugins, just jQuery. My code is as follows:

if($('#Field').val() != "")
{
    if($('#Field').val().match('^(0|[1-9][0-9]*)$'))
    {
        errors+= "Field must be numeric.<br/>";
        success = false;
    }
}

...似乎无效.我要去哪里错了?

...It doesn't seem to work. Where am I going wrong?

我收到的错误是val() is not an object.

事实证明，真正的问题是我设置了元素名称而不是ID.

It turned out that the real issue was that I had my element name set and not the Id.

推荐答案

这应该有效.我会首先从输入字段中修剪空白:

This should work. I would trim the whitespace from the input field first of all:

if($('#Field').val() != "") {
    var value = $('#Field').val().replace(/^\s\s*/, '').replace(/\s\s*$/, '');
    var intRegex = /^\d+$/;
    if(!intRegex.test(value)) {
        errors += "Field must be numeric.<br/>";
        success = false;
    }
} else {
    errors += "Field is blank.</br />";
    success = false;
}

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