ASP.NET page experiences issues with executing Javascript or jQuery code

Having trouble with client scripts not functioning correctly on a child page that utilizes a master page. Looking for help to resolve this issue.

<%@ Page Title="" Language="C#" MasterPageFile="~/Store.Master" AutoEventWireup="true" CodeBehind="NewStockEntry.aspx.cs" Inherits="StoreManagement.Admin.NewStockEntry" %>

<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" runat="server">
<script type="text/javascript">
    function resetDataEntryForm()
    {
        document.getElementById('txtProductName').value = "";
        document.getElementById('txtModelNumber').value = "";
        document.getElementById('txtBrandName').value = "";
        document.getElementById('txtPrice').value = "";
    }
</script>
<div>
    <center>
        <table width="100%">
            <tr>
                <td width="100px" valign="top">Enter Bill No: </td>

                <td align="left" width="200px">
                    <asp:TextBox ID="txtBillNumber" runat="server"...extFieldValidator></asp:RequiredFieldValidator>
                    <br />
                    <asp:RegularExpressionValidator ID="revBillNumber" runat="server"
                     ControlToValidate="txtBillNumber"
                     ErrorMessage="Only numeric allowed." ForeColor="Red"
                     ValidationExpression="^[0-9]*$" ValidationGroup="val">
                     </asp:RegularExpressionValidator>
                </td>
...</questionbody>
<exquestionbody><div class="question">
                
<p>Facing an issue with client scripts not working properly on a child page that uses a master page. Seeking assistance in resolving this matter.</p>

<pre><code><%@ Page Title="" Language="C#" MasterPageFile="~/Store.Master" AutoEventWireup="true" CodeBehind="NewStockEntry.aspx.cs" Inherits="StoreManagement.Admin.NewStockEntry" %>

<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" runat="server">
<script type="text/javascript">
    function resetDataEntryForm()
    {
        document.getElementById('txtProductName').value = "";
        document.getElementById('txtModelNumber').value = "";
        document.getElementById('txtBrandName').value = "";
        document.getElementById('txtPrice').value = "";
    }
</script>
<div>
    <center>
        <table width="100%">
            <tr>
                <td width="100px" valign="top">Enter Bill No: </td>

                <td align="left" width="200px">
                    <asp:TextBox ID="txtBillNumber" runat="server"...extFieldValidator></asp:RequiredFieldValidator>
                    <br />
                    <asp:RegularExpressionValidator ID="revBillNumber" runat="server"
                     ControlToValidate="txtBillNumber"
                     ErrorMessage="Only numeric allowed." ForeColor="Red"
                     ValidationExpression="^[0-9]*$" ValidationGroup="val">
                     </asp:RegularExpressionValidator>
                </td>
...</questionbody>
<exquestionbody><div class="question">
                
<p>I am encountering difficulties with client scripts not operating as expected on a child page using a master page. Any help with this issue would be greatly appreciated.</p>

<pre><code><%@ Page Title="" Language="C#" MasterPageFile="~/Store.Master" AutoEventWireup="true" CodeBehind="NewStockEntry.aspx.cs" Inherits="StoreManagement.Admin.NewStockEntry" %>

...
javascriptc#asp.net

Answer №1

It seems like the code will not work because you are attempting to locate an element ID that does not exist in the DOM. When using a master page in asp.net, a content placeholder tag is automatically created.

<asp:ContentPlaceHolder id="ContentPlaceHolder1" runat="server"></asp:ContentPlaceHolder>

When a page is generated with a master page, any server control created will have its ID altered when rendered in HTML. For example, txtProductName would become ContentPlaceHolder1_txtProductName, and the name attribute would be changed to ctl00$ContentPlaceHolder1$txtProductName. Therefore, the method you are currently using will not provide the desired output since there is no ID named txtProductName in the DOM. You must include ClientID to ensure proper functionality within an embedded code block.

function resetDataEntryForm() { 
    document.getElementById('<%= txtProductName.ClientID%>').value = ""; 
    document.getElementById('<%= txtModelNumber.ClientID%>').value = ""; 
    document.getElementById('<%= txtBrandName.ClientID%>').value = ""; 
    document.getElementById('<%= txtPrice.ClientID%>').value = ""; 
}

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