不允许使用空格作为第一个字符，并且只允许使用jquery的字母 [英] Not allow space as a first character and allow only letters using jquery

问题描述

我正在使用jquery进行名称验证，我尝试了下面给出的代码

Im using jquery for the name validation I have tried a code which is given below

$("#contactname").keypress(function(e) {
    if(e.which < 97 /* a */ || e.which > 122 && (e.which < 65 || e.which > 90)) {
       e.preventDefault();
    }         
});

上面的代码工作正常，只允许字母而不允许数字，但不允许空格.所以我想要的是它应该只允许字母(小写和大写字母)，然后不应该允许数字和特殊字符以及除第一个字符外，还接受空格.请告诉我复制粘贴时如何限制.

The above code is working fine to allow only letters and not allow numbers but its not allow space.So what i want is it should allow only letters (both small and capital letters) then it should not allow numbers and special characters and also accept space except as a first character And please tell me how to restrict when copy paste.

推荐答案

可以使用HTML5属性pattern吗?请参见 MDN文章有关更多信息.

Can you use the HTML5 attribute pattern? See the MDN article on it for more information.

使用^[a-zA-Z][\sa-zA-Z]*的正则表达式似乎可以满足您的要求.

Using a regex of ^[a-zA-Z][\sa-zA-Z]* seems to cover your requirements.

所以像这样:

<div>Username:</div>
<input type="text" pattern="^[a-zA-Z][\sa-zA-Z]*" title="Can use upper and lower letters, and spaces but must not start with a space" />

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