prevent在文本框中输入非ASCII字符 [英] prevent typing non ascii characters in a textbox
本文介绍了prevent在文本框中输入非ASCII字符的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
因为我认为人有我没有,可能有一些非标准的解决方案之前,遇到它大量的时间..任何人都可以给任何暗示方向如何prevent从一个文本框输入非ASCII字符的用户。
Since I think people have encounter it lots of time before I did and there may be some standart solution.. Can anybody give any hint direction how to prevent a user from typing non ascii characters in a textbox.
推荐答案
我个人觉得与互动有点讨厌的标准模式修修补补,但如果你必须过滤键盘输入,可以通过截取键preSS事件做而且你不想取消的:
I personally find tinkering with standard modes of interaction a bit annoying, but if you must filter keyboard input, you can do it by intercepting key press events and canceling the ones that you don't want:
var allowed = /[a-zA-Z0-9]/; // etc.
window.onload = function () {
var input = document.getElementById("test");
input.onkeypress = function () {
// Cross-browser
var evt = arguments[0] || event;
var char = String.fromCharCode(evt.which || evt.keyCode);
// Is the key allowed?
if (!allowed.test(char)) {
// Cancel the original event
evt.cancelBubble = true;
return false;
}
}
};
和它更简洁,prettier使用jQuery:
And it's more concise and prettier with jQuery:
var allowed = /[a-zA-Z0-9]/; // etc.
$(function () {
var input = document.getElementById("test");
$("#input").keypress(function (e) {
// Is the key allowed?
if (!allowed.test(String.fromCharCode(e.keyCode || e.which))) {
// Cancel the original event
e.preventDefault();
e.stopPropagation();
}
});
});
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