Phone number masking and validation

Question

5.00/5 (1 vote)

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Hi all,

I need to mask a phone number in the following format :

(XXX)-XX-XXXXXXX

eg:(971)-05-8907645

here the first 3 numbers ie within bracket (971) should be constant and cannot be editable.User have to enter the remaining numbers.Can anyone help me please.Thanks in advance.

What I have tried:

<asp:TextBox ID="txt_mobile" TabIndex="6"  runat="server"  Width="200px" CssClass="textboxAll" ></asp:TextBox>
                                            <asp:MaskedEditExtender ID="MaskedEditExtender1" runat="server" TargetControlID="txt_mobile" Mask="(999)999-9999" ClearMaskOnLostFocus="false"></asp:MaskedEditExtender>

Posted 29-Dec-17 2:45am

Member 12926744

Updated 30-Dec-17 18:47pm

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Sreekanth(Software Developer) · Answer 1 · 2017-12-30T06:00:00

This can be achieved through javascript validation.please see the below function

JavaScript

HTMLInputElement.prototype.maskPhoneNumber = function maskPhoneNumber(readOnlyStart, readOnlyEnd) {

           this.addEventListener('keydown', function (event) {
               var which = event.which;
               if (((which == 8) && (this.selectionStart <= readOnlyEnd && this.selectionStart >= readOnlyStart)) ||
                 ((which == 46) && (this.selectionStart < readOnlyEnd))) {
                   event.preventDefault();

               }


           });
           this.addEventListener('keypress', function (event) {
               var which = event.which;
               if ((event.which != 0) && (this.selectionStart < readOnlyEnd && this.selectionStart > readOnlyStart)) {
                    event.preventDefault();

               }
           });
       }

and call the function

JavaScript

document.getElementById("txt_mobile").maskPhoneNumber(0, 6);

html

HTML

<input type="text" id="txt_mobile" value="(971)-"  />