How to allow numbers, backspace, delete, left and right arrow keys in the html text?

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 5  2046

I am using following javascript code which I think should only allow numbers, backspace, delet, left arrow and right arrow keys in textbox, but it is also allowing alphabets. I

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花落未央

2021-02-05 07:05
No doubt your code is correct but you missed "return" keyword in textbox.
```
<input type="text" onkeypress='return validateQty(event);'>
```
You can see the code here
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情歌与酒

2021-02-05 07:06

<input type="text"  class="form-control" id="dompetku_msisdn" name="dompetku_msisdn" placeholder="Phone Number"  aria-describedby="helpBlock" onkeydown='return (event.which >= 48 && event.which <= 57) || event.which == 8 || event.which == 46 || event.which == 37 || event.which == 39' required /> </input>

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逝去的感伤

2021-02-05 07:06

      function isNumberKey(evt)
      {
         var charCode = (evt.which) ? evt.which : event.keyCode
         if (charCode > 31 && (charCode < 48 || charCode > 57))
            return false;
         return true;
      }

<HTML>
   <HEAD>
   </HEAD>
   <BODY>
      <input id="txtChar" onkeypress="return isNumberKey(event)" type="text" name="txtChar" maxlength="10">
   </BODY>
</HTML>

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情歌与酒

2021-02-05 07:19

I modified his code a bit, so you can just add a class to an input

$(".numberonly").keydown(function(e){
    // Number Only
    if (e.keyCode == 8 || e.keyCode == 46
       || e.keyCode == 37 || e.keyCode == 39) {
          return true;
      }
      else if ( e.keyCode < 48 || e.keyCode > 57 ) {
        e.preventDefault();
      }
  });

add class to an input

<input type="text" class="numberonly" />

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醉酒成梦

2021-02-05 07:20

const validateQty = (event) => {
    var key = window.event ? event.keyCode : event.which;
    console.log(event);
    if (event.keyCode === 8 || event.keyCode === 46
        || event.keyCode === 37 || event.keyCode === 39) {
        return true;
    } else if (key < 48 || key > 57) {
        return false;
    } else { return true; }
};


<input type="text" onkeydown='return validateQty(event);'>

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