如何在输入=“文本”中限制十进制数字仅显示整数

Question

How to restrict decimal numbers from a <input="text"> show only integer numbers. The field is only show like 11 not 11.00

<input type="text">

Without using

<input type="number">

Answer 1

You can use parseInt() to remove decimal part without rounding ( 11.9 => 11 , 11.1 => 11 and etc):

<input type="text" id="num">

var n = 11.13;
document.getElementById('num').value = parseInt(n); // 11

or just + operator:

var n = 11.13;
document.getElementById('num').value = +n; // 11

Answer 2

You can use match() method to checking format of input value.

 var input = document.getElementById("number"); var lastValue = ""; input.addEventListener("keydown", valueCheck); input.addEventListener("keyup", valueCheck); function valueCheck(){ if (input.value.match(/^[0-9]*$/)) lastValue = input.value; else input.value = lastValue; } 

 <label>Type your value</label> <input type="text" id="number" /> 

Answer 3

Maybe you can add a min attribute to your input html element. like this

<input type="number" min="0">

Answer 4

<input type="text" pattern="([d]+)">

You can use modern HTML5 attribute pattern for input validation on client side. Input with decimal value would be invalid.

https://jsfiddle.net/rry32tm1/