Question

在type="number"输入中，我想在点后显示“ 2.50”之类的2位数字

如果尝试

<input name="price" type="number" step="0.01" value="2.5">

这告诉我“ 2.5”而不是“ 2.50”

您有执行此操作的方法吗？ HTML5 pure或javascript吗？

Answer 1

您需要使用Jquery或JavaScript来实现所需的功能，但是Jquery中的此解决方案

您最多只能输入2个号码

//Use keyup to capture user input & mouse up to catch when user is changing the value with the arrows
    $('.trailing-decimal-input').on('keyup mouseup', function (e) {

        // on keyup check for backspace & delete, to allow user to clear the input as required
        var key = e.keyCode || e.charCode;
        if (key == 8 || key == 46) {
            return false;
        };

        // get the current input value
        let correctValue = $(this).val().toString();

         //if there is no decimal places add trailing zeros
        if (correctValue.indexOf('.') === -1) {
            correctValue += '.00';
        }

        else {

            //if there is only one number after the decimal add a trailing zero
            if (correctValue.toString().split(".")[1].length === 1) {
                correctValue += '0'
            }

            //if there is more than 2 decimal places round backdown to 2
            if (correctValue.toString().split(".")[1].length > 2) {
                correctValue = parseFloat($(this).val()).toFixed(2).toString();
            }
        }

        //update the value of the input with our conditions
        $(this).val(correctValue);
    });

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input id="my-number-input" class="form-control trailing-decimal-input" type="number" min="0.01" step="0.01" value="2.50" />

您可以预览或编辑代码Here on JSFiddle

Answer 2

您可以通过脚本来解决：

<script type="text/javascript">      
  $(document).ready(function() {
  var num = 2.5;
  var n = num.toFixed(2);
  alert(n);
  });    
</script>    
<script type="text/javascript">      
  $(document).ready(function() {
  var num = 2.500;
  var n = num.toFixed(1);
  alert(n);
  });    
</script>

html type =“ number”：点后总是显示2位数字？

2 个答案: