how to check the check box on textbox onkeypress event using javascript

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Actually if i entered data in text-box means check box should be checked....... and below is my code...

XML

<asp:GridView ID="GridView1" ShowHeader="False" runat="server" Width="95%"
                AutoGenerateColumns="False" DataSourceID="SqlDataSource1"
                DataKeyNames="DxID" ondatabound="GridView1_DataBound"
            onrowcreated="GridView1_RowCreated" onrowdatabound="GridView1_RowDataBound"
            onselectedindexchanged="GridView1_SelectedIndexChanged" CellSpacing="5"
            CssClass="grid" onrowcommand="GridView1_RowCommand"  >
                    <AlternatingRowStyle CssClass="alternatingItemStyle" />
                    <HeaderStyle CssClass="Headerstyle" />
                    <RowStyle  CssClass="RowStyle"/>
                    <SelectedRowStyle CssClass="SelectedRowStyle" />
                <Columns>
                    <asp:TemplateField>
                        <ItemTemplate>
                                       <span class="style3"><asp:CheckBox ID="chkSelect" runat="server" Checked= '<%# GetValue(Eval("IsCheck").ToString()) %>'  /></span>

                                    <asp:TextBox ID="TextBox2" runat="server" Width="95%" Height="85px"
                                        TextMode="MultiLine" CssClass="inpt_a" Font-Names="Open Sans , sans-serif"   onkeypress="check(this)"   Text='<%# Bind("Plan4") %>'></asp:TextBox>
                        </ItemTemplate>
                    </asp:TemplateField>
                </Columns>
                <HeaderStyle Height="0px" />
            </asp:GridView>

Posted 19-Feb-14 1:34am

ntitish

Updated 23-Feb-14 16:54pm

v3

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Peter Leow · Accepted Answer · 2014-02-19T02:11:00

Solution 2

Try onkeyup event like this:

XML

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default2.aspx.cs" Inherits="Default2" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<script  type="text/javascript">
    function check() {
            // remove leading and trailing spacing
        var textboxcontent = document.getElementById("<%=TextBox1.ClientID%>").value.trim();
            document.getElementById("<%=CheckBox1.ClientID%>").checked = (textboxcontent.length > 0);
        }
</script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:CheckBox ID="CheckBox1" runat="server" />
    </div>
    <p>
        <asp:TextBox ID="TextBox1" runat="server" onkeyup="check()"></asp:TextBox>
    </p>
    </form>
</body>
</html>

Posted 19-Feb-14 2:11am

Peter Leow

Updated 19-Feb-14 2:52am

v4

Comments

ntitish 23-Feb-14 22:50pm

thanks sir for your post.........here i need in onkeypress event of a textbox. and that to in grid view......i update my question with gridview. can you please see that....

Peter Leow 24-Feb-14 0:13am

Check out my solution to one of the similar question here

ntitish 24-Feb-14 0:44am

Sir in your link you explained for validation but here i need to check the check box. may be you are right but i am unable to find the logic.....but this is urgent functionality to fix it to me so may be because of that i am not getting your intention.

praks_1 24-Feb-14 0:36am

To get the textbox event 1)find grid control and then use the control event.

ntitish 24-Feb-14 0:53am

Sir i will find the grid control but how to check the check box of the particular text box which i entered data...that is the problem.

praks_1 24-Feb-14 0:56am

u can use currentfocuscontrol

ntitish 24-Feb-14 1:06am

sir can u see my above code i am having check box,TextBox in ItemTemplate if i enter any text in textbox of the gridview of the particular row i should check the check box so is it possible in javascript......

praks_1 24-Feb-14 1:06am

http://jsfiddle.net/tEP6w/ check this

ntitish 24-Feb-14 1:08am

if possible can you provide me javascript code...because i am new to javascript...if you provided the code means i will use this code in my project in future i will use the code related to my functionality by altering the code......

praks_1 24-Feb-14 1:10am

check this link:
http://forums.asp.net/t/1632997.aspx?How+to+create+a+flipcart+like+panel+for+showing+products+in+gridview

praks_1 24-Feb-14 1:13am

http://www.dotnetspider.com/resources/45190-OnKeyDown-Event-textbox.aspx

ntitish 24-Feb-14 1:23am

Thanks sir...the above link is working for me........sir i need one more help....from now i am well interested in learning jaavscript...so i want to learn, from where i can start learning jaavscript......can you give me suggestion..