How to allow only integers in a textbox? [duplicate]

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 19  2021

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19条回答

猫巷女王i

2020-11-27 15:34

Try This :

<input type="text"  onkeypress = "return isDigit(event,this.value);"/>

function isDigit(evt, txt) {
        var charCode = (evt.which) ? evt.which : event.keyCode

        var c = String.fromCharCode(charCode);

        if (txt.indexOf(c) > 0 && charCode == 46) {
            return false;
        }
        else if (charCode != 46 && charCode > 31 && (charCode < 48 || charCode > 57)) {
            return false;
        }

        return true;
    }

Call this function from input textbox on onkeypress event

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温柔的废话

2020-11-27 15:37

Try this:

Note:This is using Ajax Toolkit

First add Ajax Script Manager and use the below Code

<asp:FilteredTextBoxExtender ID="TextBox1_FilteredTextBoxExtender" runat="server"
Enabled="True" TargetControlID="TextBox1" FilterType="Numbers">
</asp:FilteredTextBoxExtender>

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花落未央

2020-11-27 15:38

try this instead

Note:This is using Ajax Toolkit

First add Ajax Script Manager and use the below Code to apply filter to the textbox

Provide the Namespace at the beginning of the asp.net page

<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>

<asp:TextBox ID="TxtBox" runat="server"></asp:TextBox>
<cc1:FilteredTextBoxExtender ID="FilteredTextBoxExtender1" runat="server" Enabled="True" TargetControlID="TxtBox" FilterType="Numbers" FilterMode="ValidChars">
</cc1:FilteredTextBoxExtender>

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慢半拍i

2020-11-27 15:45

<HTML>
   <HEAD>
   <SCRIPT language=Javascript>
      function isNumberKey(evt)
      {
         var charCode = (evt.which) ? evt.which : evt.keyCode;
         if (charCode > 31 && (charCode < 48 || charCode > 57))
            return false;    
         return true;
      }
   </SCRIPT>
   </HEAD>
   <BODY>
      <INPUT id="txtChar" onkeypress="return isNumberKey(event)" type="text" name="txtChar">
   </BODY>
</HTML>

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感动是毒

2020-11-27 15:45

step by step

given you have a textbox as following,

<asp:TextBox ID="TextBox13" runat="server" 
  onkeypress="return functionx(event)" >
</asp:TextBox>

you create a JavaScript function like this:

     <script type = "text/javascript">
         function functionx(evt) 
         {
            if (evt.charCode > 31 && (evt.charCode < 48 || evt.charCode > 57))
                  {
                    alert("Allow Only Numbers");
                    return false;
                  }
          }
     </script>

the first part of the if-statement excludes the ASCII control chars, the or statements exclued anything, that is not a number

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忘掉有多难

2020-11-27 15:45

we can use javascript code

function validateAlphaNumericCode(event) {
    keyEntry = (event.which) ? event.which : event.keyCode

    if (((keyEntry >= '65') && (keyEntry <= '90')) || ((keyEntry >= '97') && (keyEntry <= '122')) || (keyEntry == '37') || (keyEntry == '39') || (keyEntry == '46') || (keyEntry == '8') || (keyEntry == '9') || (keyEntry == '95') || ((keyEntry >= '48') && (keyEntry <= '57')))
        return true;
    else
        return false;
}

validate this code with your textbox.

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