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ListView Javascript

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ListView
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Shane
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Shane asked on 06 Oct 2010, 04:33 PM
Greetings,

I am attempting to access controls inside the EditItemTemplate Via a Javascript. It is a project requirement that I read the text of a text box as it is entered and based on that text hide and remove information. Below is the code I currently working with. Again, the text box is currently inside a RadListView EditItemTemplate. Any information would be most appreciated.

<telerik:RadTextBox runat="server" ID="myTextBox" Width="150px" Text='<%#Bind("Number")%>'>
<ClientEvents OnLoad="showPLC" OnKeyPress="showPLC" />
</telerik:RadTextBox>
 
<script language="javascript" type="text/javascript">
 
    function showPLC() {
 
        var eItem = $find('<%= RadListView1.Items[0] %>');
 
        if (eItem.IsInEditMode) {
 
            var num = eItem.FindControl("myTextBox").val();
            var bin = num.substring(0,6);
            if (bin == '577442') {
 
                eItem.FindControl("divEffect1").hide();
                eItem.FindControl("divEffect2").slideDown();
 
            } else {
 
                eItem.FindControl("divEffect1").slideDown();
                eItem.FindControl("divEffect2").hide();
            }
        }              
    }
 
</script>


Thank you for your time!

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Dimo
Telerik team
answered on 07 Oct 2010, 04:28 PM
Hi Shane,

You seem to be confusing server-side ASP.NET methods with client-side Javascript methods and the resulting Javascript code is not working at all.

1. $find() expects a client ID (string) associated with an ASP.NET AJAX control. RadListView1.Items[0] is not such a string.

2. There is no Javascript method FindControl().

3. val(), hide() and slideDown() look like jQuery methods, however you execute them with no reference to a jQuery object.

I recommend you to start from scratch and recreate a simplified version of your scenario outside RadListView with simple asp:TextBox only, so that you can get a grasp on the general Javascript knowledge required in this case. Afterwards we will help you incorporating the implementation inside RadListView, if you need any further assistance.

Regards,
Dimo
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Shane
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answered on 07 Oct 2010, 04:47 PM
I Apologize, I should have been more clear. You are correct in that I do not have a vast understanding of Javascript. However I did have the Javascript working outside the of EditItemTemplate of a rad list view. The above code was my bad attempt to explain what I was attempting to do. below is the working code from the out of template Javascript. The issue I am having is I cannot access the txtName, divEffect1, or divEffect2 because they are in the EditItemTemplate. I do not know the syntax to access and manipulate those elements. Again, I apologize for not showing my initial scenario and greatly appreciate your assistance.

Edit: This code is in a UserControl and I am using JQuery and referencing it properly.

function showPLC() {
 
        var num = $find('<%= txtName.ClientID  %>').val();
        var bin = num.substring(0, 6);
 
        if (bin == '5774422') {
 
            $find('<%= divEffect1  %>').hide();
            $find('<%= divEffect2  %>').slideDown();
 
        } else {
 
            $find('<%= divEffect1  %>').slideDown();
            $find('<%= divEffect2  %>').hide();
 
        }
         
    }
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Dimo
Telerik team
answered on 12 Oct 2010, 08:49 AM
Hi Shane,

Here is a simple demo, which shows a possible approach - you can use the fact that all controls and elements inside the EditItemTemplate share a common naming container - the edit item. So if you have the client ID of the RadTextBox, you can build all other clienti IDs.

By the way, please do not confuse $get() and $find(). The former returns a DOM element, the latter returns an ASP.NET AJAX client control instance. I suspect that divEffect1 is not a client control instance.

http://msdn.microsoft.com/en-us/library/bb397717.aspx

http://msdn.microsoft.com/en-us/library/bb397441.aspx


<%@ Page Language="C#" %>
<%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %>
 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
 
<script runat="server">
 
</script>
 
<head id="Head1" runat="server">
<meta http-equiv="content-type" content="text/html;charset=utf-8" />
<title>RadControls for ASP.NET AJAX</title>
</head>
<body>
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server" />
 
<p style="color:#f00">Press an edit button:</p>
 
<telerik:RadListView runat="server" ID="RadListView1" DataKeyNames="CategoryID"
    DataSourceID="SqlDataSource1">
    <AlternatingItemTemplate>
        <div class="rlvA">
            <asp:Button ID="EditButton" runat="server" CommandName="Edit" CssClass="rlvBEdit"
                Text=" " />
            <asp:Label ID="CategoryIDLabel" runat="server" Text='<%# Eval("CategoryID") %>' />
            <asp:Label ID="CategoryNameLabel" runat="server" Text='<%# Eval("CategoryName") %>' />
        </div>
    </AlternatingItemTemplate>
    <EditItemTemplate>
        <div class="rlvIEdit">
            <asp:Label ID="CategoryIDLabel" runat="server" Text="CategoryID"></asp:Label>
            <asp:Label ID="CategoryIDValue" runat="server" Text='<%# Bind("CategoryID") %>' />
            <br />
            <asp:Label ID="CategoryNameLabel" runat="server" AssociatedControlID="CategoryNameValue"
                Text="CategoryName"></asp:Label>
                <p style="color:#f00">Clear the textbox value and see what happens:</p>
            <telerik:RadTextBox ID="CategoryNameValue" runat="server" Text='<%# Bind("CategoryName") %>'>
                <ClientEvents OnLoad="toggleLabelDisplay" OnValueChanged="toggleLabelDisplay" />
            </telerik:RadTextBox>
            <asp:Label ID="CategoryNameValidationLabel" runat="server" Text="CategoryName is a required field" style="display:none" />
            <br />
            <asp:Button ID="UpdateButton" runat="server" CommandName="Update" CssClass="rlvBUpdate"
                Text=" " />
            <asp:Button ID="CancelButton" runat="server" CausesValidation="False" CommandName="Cancel"
                CssClass="rlvBCancel" Text=" " />
        </div>
    </EditItemTemplate>
    <ItemTemplate>
        <div class="rlvI">
            <asp:Button ID="EditButton" runat="server" CommandName="Edit" CssClass="rlvBEdit"
                Text=" " />
            <asp:Label ID="CategoryIDLabel" runat="server" Text='<%# Eval("CategoryID") %>' />
            <asp:Label ID="CategoryNameLabel" runat="server" Text='<%# Eval("CategoryName") %>' />
        </div>
    </ItemTemplate>
    <LayoutTemplate>
        <div class="RadListView RadListView_Default">
            <div id="itemPlaceholder" runat="server">
        </div>
    </LayoutTemplate>
</telerik:RadListView>
 
<script type="text/javascript">
 
function toggleLabelDisplay(sender, args)
{
    var labelID = sender.get_id().replace("CategoryNameValue", "CategoryNameValidationLabel");
    if (sender.get_value() == "")
        $get(labelID).style.display = "";
    else
        $get(labelID).style.display = "none";
}
 
</script>
 
<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:NorthwindConnectionString %>"
    SelectCommand="SELECT TOP 5 [CategoryID], [CategoryName] FROM [Categories]">
</asp:SqlDataSource>
 
</form>
</body>
</html>


Regards,
Dimo
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Shane
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answered on 12 Oct 2010, 03:38 PM
Thank you! The replace function really made the difference. It is working nearly flawlessly.
<script language="javascript" type="text/javascript">
 
    function toggleDisplay(sender, args) {
         
        var div1 = sender.get_id().replace("txtNumber", "div1");
        var div2 = sender.get_id().replace("txtNumber", "div2");
 
        var bin = sender.get_value().substring(0, 6);
 
        if (bin == "577442") {
 
            $get(div1).style.display = "";
            $get(div2).style.display = "none";
 
        } else {
 
            $get(div1).style.display = "none";
            $get(div2).style.display = "";
 
        }
    }
 
</script>
 
<telerik:RadTextBox runat="server" ID="txtNumber" Width="150px" Text='<%#Bind("Number")%>'>
     <ClientEvents OnLoad="toggleDisplay" OnKeyPress="toggleDisplay" />
</telerik:RadTextBox>

The only issue I am currently having is that the "OnKeyPress" is one key press behind. Meaning if the RadTextBox currently has 577442 the javascript will show that the value is 57744. It is a requirement that the script run correctly when 577442 is entered. I used the "OnValueChanged" but the restriction to that function is the RadTextBox must loose focus. I greatly appreciate your assistance! It has been a tremendous help!

Thank Again!
Shane
0
Dimo
Telerik team
answered on 12 Oct 2010, 03:42 PM
Hi Shane,

Key events are fired too early for you to be able to obtain the updated value - you should either use a timeout, or define an interval function once the RadTextBox is focused. The interval function will be stopped once the RadTextBox is blurred.

http://www.w3schools.com/js/js_timing.asp

http://www.elated.com/articles/javascript-timers-with-settimeout-and-setinterval/

Regards,
Dimo
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Shane
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answered on 13 Oct 2010, 03:39 PM
Thanks again for all your help, you definitely got me started in the right direction! Below is the final working code. I would assume if your RadListView had more items than one you could just iterate through them based on the count or something similar. Thanks again!

<script language="javascript" type="text/javascript">
 
        var interval_name = 0;
 
        function startInterval(sender, args) {
 
            interval_name = setInterval("toggleDisplay()", 500);
 
        }
 
        function stopInterval() {
 
            clearInterval(interval_name);
 
        }   
 
        function toggleDisplay() {
 
            var bin = $find('<%=((RadTextBox)rlvCreditCard.Items[0].FindControl("txtCCNumber")).ClientID%>').get_textBoxValue().substring(0, 6);
 
            if (bin == "577442") {
 
                $find('<%=((RadTextBox)rlvCreditCard.Items[0].FindControl("txtCCCsv")).ClientID%>').disable();
                $find('<%=((RadComboBox)rlvCreditCard.Items[0].FindControl("cbxMonth")).ClientID%>').disable();
                $find('<%=((RadComboBox)rlvCreditCard.Items[0].FindControl("cbxYear")).ClientID%>').disable();               
 
            } else {
 
                $find('<%=((RadTextBox)rlvCreditCard.Items[0].FindControl("txtCCCsv")).ClientID%>').enable();
                $find('<%=((RadComboBox)rlvCreditCard.Items[0].FindControl("cbxMonth")).ClientID%>').enable();
                $find('<%=((RadComboBox)rlvCreditCard.Items[0].FindControl("cbxYear")).ClientID%>').enable();              
 
            }
        }
    </script>
 
<telerik:RadTextBox runat="server" ID="txtCCNumber" Width="150px" Text='<%#Bind("Number")%>'>
                            <ClientEvents OnFocus="startInterval" OnBlur="stopInterval" />
</telerik:RadTextBox>
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