如何限制两位数的十进制值，并在数值中限制多于一的十进制数

I have one amount field in that i want to restrict user after decimal they can not use more than two values:

我有一个金额字段,我想在十进制后限制用户,他们不能使用两个以上的值:

After decimal there should be only two values that are option.

在十进制之后,应该只有两个值是选项。

User can not type more than one decimal in the field.

用户不能在字段中键入多个小数。

I am using following regix for that its not working can any one help.

我正在使用以下regix,因为它不起作用可以任何一个帮助。

function validate(evt) {

    if (evt.keyCode == 8) { return true; }// for backspace problem in mozilla

    var theEvent = evt || window.event;
    var key = theEvent.keyCode || theEvent.which;

    key = String.fromCharCode(key);
    var regex = /[0-9 ]|\,\d{1,2}/;

    if (!regex.test(key)) 
    {
        theEvent.returnValue = false;
        if (theEvent.preventDefault) theEvent.preventDefault();
    }
}

2 个解决方案

#1

This can actually be accomplished using HTML only by setting the STEP and MAX of your numeric field such as

这实际上只能通过设置数字字段的STEP和MAX来使用HTML来完成

<form>
	<input type="number" name="myNumber" required=true step=".01">
	<button>send</button>
</form>

please let me know if this is what your looking for but this will mean that any value entered must be numeric(thus only 1 decimal point) it must be less than or equal to 1 (you can set to .99 if you dont want to include 1) and it must be an increment of .01(so it can only have 2 decimal places.

如果这是你想要的,请告诉我,但这意味着输入的任何值必须是数字(因此只有1个小数点)它必须小于或等于1(如果你不想要,你可以设置为.99包括1)并且它必须是.01的增量(因此它只能有2个小数位。

Just re-read your question you can remove the max(i thought i read no more than 1.0)

只需重新阅读你的问题就可以删除max(我以为我读的不超过1.0)

#2

var previousValue;

function numberChanged(element){
  if(validateMe(element)==false){
      element.value=previousValue;
    }else{
      previousValue=element.value;
  
  }

function validateMe(element){
     wholeNumber=element.value.split(".")[0];
    if(element.value.split(".").length==1){
      if(wholeNumber<-1 || > 999999999){
              
          return false;
          }
    }else if(element.value.split(".").length==2){
        decimalValue=element.value.split(".")[1];
        if(decimalValue>-1 && decimalValue<100){
                if(wholeNumber<-1 || > 999999999){
              
          return false;
          }
          }else{
            return false;
            }
    }else{
        return false;
     }
  
 }

<input type="text" id="myNumber" onChange="numberChanged(this)" />

#1