为什么这个javascript onkeypress事件不起作用？(Why this javascript onkeypress event is not working?)

为什么这个javascript onkeypress事件不起作用？(Why this javascript onkeypress event is not working?)

我不确定问题是否与我的代码或浏览器有关，我已经尝试了所有我知道的但无法找到解决方案。

这是我的代码：

var postcode = document.getElementById("deliveryPostcode"); postcode.onkeypress = checkForDigits;

我有一个表单输入，我想阻止用户输入非数字字符。 所以只允许0-9的数字。 但是，无论我在文本框中输入什么，我都会收到警报框。 我正在使用Firefox。

function checkForDigits(keyPressEvent) { var keyCode = keyPressEvent.keyCode; if (keyCode < 48 || keyCode > 57) { alert("Not a digit"); } }

I am not sure if the problem is with my code or the browser, I have tried everything I know but can not find a solution.

Here is my Code:

var postcode = document.getElementById("deliveryPostcode"); postcode.onkeypress = checkForDigits;

I have a form input, and I want to stop the user from entering non-digit characters. So only digits from 0-9 are allowed. But does not matter what I enter in the textbox I get the alert box. I am using firefox.

function checkForDigits(keyPressEvent) { var keyCode = keyPressEvent.keyCode; if (keyCode < 48 || keyCode > 57) { alert("Not a digit"); } }

最满意答案

onkeypress有一些问题与firefox尝试onkeydown它工作正常

function checkForDigits(keyPressEvent) { var keyCode = keyPressEvent.keyCode; if (keyCode < 48 || keyCode > 57) { alert(keyCode); } } var postcode = document.getElementById("deliveryPostcode"); postcode.onkeydown = checkForDigits;

的jsfiddle

onkeypress has some issues with firefox try onkeydown it works fine

function checkForDigits(keyPressEvent) { var keyCode = keyPressEvent.keyCode; if (keyCode < 48 || keyCode > 57) { alert(keyCode); } } var postcode = document.getElementById("deliveryPostcode"); postcode.onkeydown = checkForDigits;

JsFiddle