Utilize JavaScript to Toggle Tables On and Off for Multiple Instances Within a Single ASP Page

After successfully receiving a quick answer to my previous question, I have encountered a new issue. Specifically, I am facing a problem with an asp label that dynamically sets text on instantiation and triggers an onmousedown function tied to a JavaScript function. This function enables a table area below the label which is set to display:none by default. Everything works perfectly until I place two of these user controls on a single page. Despite having the correct label text for both controls, the JavaScript enable function ends up setting the display attribute of the first user control's table to block instead of the intended one clicked. The root cause seems to be related to all user controls sharing the same id name due to being instances of the same user control. I'm struggling to find a workaround, whether it's assigning dynamic names to tables on instantiation or exploring other solutions.

Below is the ASP code for the user control:

function enableDivArea(objName) {
    document.getElementById(objName).style.display = "block";
}
function disableDivArea(objName) {
    document.getElementById(objName).style.display = "none";
    document.forms[0].submit();
}<asp:Label style="cursor:pointer;color:#EA9156;font-family:Arial,Helvetica,sans-serif;font-weight:bold;" ID="m_emailAddressLabel" onmousedown="enableDivArea('EmailFormDivArea');" runat="server" Text="<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="fa8995979f95949fba9f979b93969b9e9e889f8989d4999597">[email protected]</a>"></asp:Label>
<table id="EmailFormDivArea" style="display:none; border-style: outset; border-width: thin">
    <tr>
        <td>To: <asp:Label ID="m_sendEmailToLabel" runat="server" Text=""></asp:Label></td>
        <td align="right"><asp:Label onmousedown="disableDivArea('EmailFormDivArea');" id="m_closeLabel" runat="server" Text="close"></asp:Label></td>
    </tr>
    <tr>
        <td><asp:Label ID="m_fromLabel" runat="server" Text="First Name:" Visible="True"></asp:Label></td>
        <td><asp:TextBox ID="m_firstNameBox" runat="server" Visible="True"></asp:TextBox></td>
    </tr>
    <tr>
        <td><asp:Label ID="Label1" runat="server" Text="Last Name:" Visible="True"></asp:Label></td>
        <td><asp:TextBox ID="m_lastNameBox" runat="server" Visible="True"></asp:TextBox></td>
    </tr>
    <tr>
        <td><asp:Label ID="Label2" runat="server" Text="E-mail:" Visible="True"></asp:Label></td>
        <td><asp:TextBox ID="m_emailBox" runat="server" Visible="True"></asp:TextBox></td>
    </tr>
    <tr>
        <td><asp:Label ID="Label3" runat="server" Text="Phone number:" Visible="True"></asp:Label></td>
        <td><asp:TextBox ID="m_phoneNumberBox" runat="server" Visible="True"></asp:TextBox></td>
    </tr>
    <tr>
        <td><asp:Label ID="Label4" runat="server" Text="Message:" Visible="True"></asp:Label></td>
        <td><asp:TextBox ID="m_messageBox" runat="server" Visible="True" Rows="6" TextMode="MultiLine"></asp:TextBox></td>
    </tr>
    <tr>
        <td colspan="2" align="center"><asp:Button ID="m_sendMessageButton" runat="server" Text="Send Message" 
                        onclick="m_sendMessageButton_Click" /></td>
    </tr>
    <tr>
        <td colspan="2" align="center"><asp:Label runat="server" ID="m_statusLabel" Text="" Visible="true"></asp:Label></td>
    </tr>
</table> 

The corresponding code behind appears as follows:

protected void Page_Load(object sender, EventArgs e)
{
    m_emailAddressLabel.Text = this.Parameter;
    m_sendEmailToLabel.Text = this.Parameter;

}

Answer №1

To ensure the table runs on the server and allows user control implementation of INamingContainer, you must construct the table's ID programmatically using HtmlTable in an overridden CreateChildControls method. For example, you can concatenate the ID with "table".

UPDATE: It is also necessary to have dynamic ID references in the javascript. One way to achieve this is to use <asp:PlaceHolder>'s and set them from code-behind in CreateChildControls. Alternatively, you could embed these small scripts inline and emit them from the code-behind by setting client attributes on the asp:Label.

Answer №2

Have you checked if the tables share the same ID? It could be causing the script to only target the first one it encounters.

Consider giving each table a unique ID!

Try using an asp:table and include the following code:

onmousedown="enableDivArea('<%=tableName.ClientID%>');" 

Answer №3

To start with, you have the option to define the CssClass attribute for the style.

For hiding: utilize the code document.getElementById(theIdOfYourTable).style.display = 'none';

The procedure for enabling remains unchanged.

Answer №4

Oops, my apologies for the mistake. It slipped my mind that you can't use <%%> in a server tag (and I'm doing this from memory). A better approach for you would be to invoke the script like this:

onmousedown="enableDivArea(this);"

In your script, there is no need to use document.getElementById anymore since the element is already passed as a parameter.

Answer №5

After reading Henk's previous response, I found a new and innovative way to achieve my goal by using the information provided by you guys. I decided to dynamically add an attribute to the label that would trigger the JavaScript function from the onmousedown event during the Page_Load event. Here is the line of code that made it all work seamlessly:

m_emailAddressLabel.Attributes.Add("onmousedown", "enableDivArea('" + EmailFormDivArea.ClientID + "');");

I sincerely appreciate all the assistance I received. Thank you!

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