How to get quantity multiply price in amount textbox by jque

Problem

How to get quantity multiply price in amount textbox by jquery asp.net .

I work on web application web form asp.net .

AND I need to get qunatity * price and result display on Amount

when i try to do that i get error

JavaScript runtime error: Unable to get property 'children' of undefined or null

reference .

this error on line var quantity = tableRows[2].children[0].innerHTML;

"scripts/jquery-3.3.1.js">
"scripts/jquery-3.3.1.min.js">
"text/javascript">
$(function () {
$(".CssPrice").on('change keyup paste', function () {
var textBox = this;
var Price = $(textBox).val();
var tableRows = $(textBox).parent().parent().parent().parent().children();
if (Price != "") {
var quantity = tableRows[2].children[0].innerHTML;
var itemTotal = price * quantity;
tableRows[4].children[0].innerHTML = itemTotal;
}
else
tableRows[4].children[0].innerHTML = "";
});
});
"GridItems" runat="server" AutoGenerateColumns="false" OnRowDataBound="GridItems_RowDataBound" OnRowEditing="OnRowEditing" OnRowCancelingEdit="OnRowCancelingEdit" OnDataBound="GridItems_DataBound" >
"RowNumber" HeaderText="Row Number" />
"ItemCode">
"ddlItemCode" runat="server" Width="150px" AutoPostBack="true" >
"Quantity">
"TxtQuantity" runat="server" Text='<%# Bind("Quantity") %>' >
"Price">
"TxtPrice" runat="server" Text='<%# Bind("Price") %>' OnTextChanged="TxtPrice_TextChanged" AutoPostBack="true" CssClass="CssPrice" >
"Amount" >
"TxtAmount" runat="server" Text='<%# Bind("Amount") %>' >

3 Replies

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Laxmidhar Sahoo8y ago
you already done it in the code
"TxtPrice" runat="server" Text='<%# Bind("Price") %>' OnTextChanged="TxtPrice_TextChanged" AutoPostBack="true" CssClass="CssPrice" >

"TxtQuantity" runat="server" Text='<%# Bind("Quantity") %>'  CssClass = "cssqty">
The used css class define in style
in jquery
$(".cssqty").on('requird event', function () {
}
ahmed elbarbary8y ago
can you please show me that by code if possible
Laxmidhar Sahoo8y ago
for quantity text box take another css class
and call it jquery through