javascript javascript正则表达式禁止所有特殊字符
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javascript regex to disallow all special characters
提问by Ashwin
Here is a fiddle to start - http://jsfiddle.net/zuVpx/1/
这是一个开始的小提琴 - http://jsfiddle.net/zuVpx/1/
Javascript code:
Javascript代码：
<script>
function validate(e) {
var regex = new RegExp("[a-zA-Z0-9]");
var key = e.keyCode || e.which;
key = String.fromCharCode(key);
if(!regex.test(key)) {
e.returnValue = false;
if(e.preventDefault) {
e.preventDefault();
}
}
}
</script>
HTML code:
HTML代码：
<input type="text" onkeypress="validate(event)" />
I want only characters and numbers. Keys like backspace, delete, capslock and arrowkeys etc should work.
我只想要字符和数字。退格、删除、大写锁定和箭头键等键应该可以工作。
Thanks in advance.
提前致谢。
回答by KooiInc
回答by WillyMilimo
Try
尝试
/[-!$%^&*()_+|~=`\#{}\[\]:";'<>?,.\/]/.test(your_variable)
It returns true if there is a match.
如果匹配，则返回 true。
回答by Dve
How about just using an additional if clause? Something like...
只使用一个额外的 if 子句怎么样？就像是...
key.charCodeAt(0) > 32
So...
所以...
function validate(e) {
var regex = new RegExp("[a-zA-Z0-9]");
var key = e.keyCode || e.which;
key = String.fromCharCode(key);
if(!regex.test(key) && key.charCodeAt(0) > 32) {
e.returnValue = false;
if(e.preventDefault) {
e.preventDefault();
}
}
}
回答by MikeM
To overcome the problem that for example the left arrow key produces the same keyvalue as the %key, you could use
为了克服例如向左箭头键产生与键相同的key值的问题%，您可以使用
function validate(e) {
e = e || window.event;
var bad = /[^\sa-z\d]/i,
key = String.fromCharCode( e.keyCode || e.which );
if ( e.which !== 0 && e.charCode !== 0 && bad.test(key) ) {
e.returnValue = false;
if ( e.preventDefault ) {
e.preventDefault();
}
}
}
Any printable character should produce a non-zero e.whichand e.charCodevalue.
See JavaScript Madness: Keyboard Events.
任何可打印字符应该产生一个非零e.which和e.charCode值。
请参阅JavaScript 疯狂：键盘事件。
The above assumes spaces are valid - if not, just remove the \sfrom the negated character class.
以上假设空格有效 - 如果不是，只需\s从否定字符类中删除。
