javascript 如何验证文本框，它应该只允许字符 AZ 和 az，而不是整数或特殊字符
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How can I validate a text box, which should only allow characters A-Z & a-z, not integers nor special characters
提问by khan ggg
How to validate a text box in html, where user will enter his first name, and input do not accept integers & Special Characters?
如何验证html中的文本框，用户将在其中输入他的名字，并且输入不接受整数和特殊字符？
<input name="txtfname" type="text" maxlength="30" required />
回答by AeJey
Try this javascript code for validation
试试这个 javascript 代码进行验证
function Validate()
{
var val = document.getElementById('your_input_control_id').value;
if (!val.match(/^[a-zA-Z]+$/))
{
alert('Only alphabets are allowed');
return false;
}
return true;
}
回答by 0x6C77
You will want to check the username field on both the client and server side.
您将要检查客户端和服务器端的用户名字段。
Javascript:
Javascript：
var username = document.getElementsByName("txtfname")[0].value;
if (username .match(/^[A-Za-z]+$/)) {
// Valid
} else {
// Invalid
}
PHP:
PHP：
$username = $_POST['txtfname'];
if (preg_match("/^[A-Za-z]+$/", $username ) {
// Valid
} else {
// Invalid
}
回答by Karan Patyal
In Javascript
var uname = document.form.username;
function validate(){
var letters = /^[A-Za-z]+$/;
if(uname.value.match(letters))
{
return true;
}
else
{
alert('Username must have alphabet characters only');
return false;
}
}
In Html
<form method="post" action="#" onSubmit="return validate();" name="form">
<input type="text" name="username" class="username"/>
<input type="submit" value="submit">
</form>
回答by MasterMohsin
This is the proper RegEx.
这是正确的正则表达式。
The only punctuations that should be allowed in a name are full stop, apostrophe and hyphen. This RegEx will also work for names like André.
名称中唯一允许使用的标点符号是句号、撇号和连字符。这个 RegEx 也适用于像 André 这样的名字。
^[\p{L} .'-]+$
^[\p{L} .'-]+$
var username = document.getElementsById("fname").value;
if (username .match(/^[\p{L} \.'\-]+$/)) {
// Valid username
} else {
// Invalid username
}
