How to use JS to verify input numbers and retain decimals-JS Tutorial-php.cn

How to use JS to verify input numbers and retain decimals

php中世界最好的语言

Release： 2018-05-30 15:13:42

Original

1626 people have browsed it

This time I will show you how to use JS to implement the function of verifying input numbers and retaining decimals, and how to use JS to implement the functions of verifying input numbers and retaining decimals. What are the precautions?. Here are practical cases. Let’s take a look. take a look.

1. Verification method validationNumber(e, num) e represents the label object, num represents the number of decimal places to be retained

function validationNumber(e, num) {
      var regu = /^[0-9]+\.?[0-9]*$/;
      if (e.value != "") {
        if (!regu.test(e.value)) {
          alert("请输入正确的数字");
          e.value = e.value.substring(0, e.value.length - 1);
          e.focus();
        } else {
          if (num == 0) {
            if (e.value.indexOf('.') > -1) {
              e.value = e.value.substring(0, e.value.length - 1);
              e.focus();
            }
          }
          if (e.value.indexOf('.') > -1) {
            if (e.value.split('.')[1].length > num) {
              e.value = e.value.substring(0, e.value.length - 1);
              e.focus();
            }
          }
        }
      }
    }

Copy after login

2. Verification integer

<asp:TextBox ID="txtNg" name="txtNg" runat="server" Height="16px" Width="98px" Font-Size="9pt"
   CssClass="EditTextBox" onpropertychange="validationNumber(this,0)"></asp:TextBox>

Copy after login

3. One digit is reserved Decimal

<asp:TextBox ID="txtChglinecost" name="txtChglinecost" runat="server" Height="16px" Width="98px" Font-Size="9pt" 
   CssClass="EditTextBox" onpropertychange="validationNumber(this,1)"></asp:TextBox>

Copy after login

4. Keep two decimal places

<asp:TextBox ID="txtStdyr" name="txtStdyr" runat="server" Height="16px" Width="98px" Font-Size="9pt" 
   CssClass="EditTextBox" onpropertychange="validationNumber(this,2)"></asp:TextBox>

Copy after login

5. Keep three decimal places

Just put validationNumber(this,3) in the method Just change the second parameter to 3.

Keep four decimal places, keep five decimal places, and so on...

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the PHP Chinese website !