输入类型编号时如何防止“0”作为第一个字符？

I want to prevent 0 as the first character. But when I focusout and focusin again, then I add "2" in the first, it still run, I want should not run.

我想阻止0作为第一个字符。但是当我再次聚焦和焦点时，我在第一个中添加“2”，它仍然运行，我想不应该运行。

Here is my HTML

这是我的HTML

<input type="number" id="test">

My JS

我的JS

$('#test').keypress(function(evt) {
  if (evt.which == "0".charCodeAt(0) && $(this).val().trim() == "") {
  return false;
   }
});

Anybody help or suggest what should I do? Thank you.

有人帮忙或建议我该怎么办？谢谢。

2 个解决方案

#1

You can use input event, which also handles pasted values, String.prototype.replace() with RegExp /^0/ to replace all 0 characters found within .value of element

你可以使用输入事件，它也处理粘贴的值，String.prototype.replace（）和RegExp / ^ 0 /来替换在元素的.value中找到的所有0个字符

$("#test").on("input", function() {
  if (/^0/.test(this.value)) {
    this.value = this.value.replace(/^0/, "")
  }
})

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js">
</script>
<input type="number" id="test">

#2

Compare which property with the ASCII code of number 0 and return false.

将哪个属性与数字0的ASCII代码进行比较并返回false。

if (evt.which === 48) {
  return false;
}

Check Fiddle

检查小提琴

#1