jQuery:如何过滤掉keypress事件中的非字符键? [英] jQuery: how to filter out non-character keys on keypress event?
问题描述
我尝试搜索但不确定要查找的字词。
I tried searching but unsure of what terms to look for.
我正在使用jQuery并希望在文本框中使用keypress事件,但阻止所有不可打印的字符(即输入, ESC ,箭头键,退格,标签, ctrl ,插入, F1 - F12 等)来触发事件。
I'm using jQuery and would like to use the keypress event in a textbox, but prevent all non-printable characters (ie. Enter, ESC, arrow keys, backspace, tab, ctrl, insert, F1-F12, etc) from triggering the event.
是否有一种简单的方法可以确定它是否可打印?
Is there an easy way to determine if it is printable?
推荐答案
此问题的选定答案未完成。它不处理与修饰键一起按下字符键的情况(例如 CTRL - A )。
The selected answer for this question is not complete. It does not handle the case where a character key is being pressed in combination with a modifier key (e.g. CTRL-A).
例如,尝试使用带有以下代码的firefox键入 CTRL - A 。目前的答案将其视为一个字符:
Try, for example, typing CTRL-A using firefox with the following code. The current answer will consider it as a character:
HTML:
<input placeholder="Try typing CTRL-A in Firefox" style="width: 200px"/>
JavaScript:
JavaScript:
$("input").keypress(function (e) {
if (e.which !== 0) {
alert(String.fromCharCode(e.which));
}
});
注意:如果使用某些浏览器(例如Chrome),则不会触发警报他们不会为非字符输入触发按键事件。
Note: an alert won't be fired if using some browsers (such as Chrome), since they don't fire a keypress event for non-character inputs.
更好的解决方案可能是:
A better solution might be:
HTML:
<input placeholder="Try typing CTRL-A in Firefox" style="width: 200px"/>
JavaScript:
JavaScript:
$("input").keypress(function (e) {
if (e.which !== 0 &&
!e.ctrlKey && !e.metaKey && !e.altKey
) {
alert(String.fromCharCode(e.which));
}
});
在这种情况下,只有在 A 时才会触发警报所有浏览器都按了 CTRL - A 。
In this case, the alert is only being fired when A is pressed, not CTRL-A for all browsers.
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