Target the initial asp:textbox within every bootstrap tab upon selecting the tab link

As a beginner in the world of development, I recently embarked on creating a basic ASP.NET application. Within this project, I've utilized Bootstrap tabs that contain ASP labels and textboxes. My goal is to have the first textbox within the tab content automatically focused when the respective tab is clicked. Despite my efforts to search for solutions online, most examples cater to input fields (e.g. input type="text") rather than ASP textboxes. Any guidance or advice would be greatly appreciated. Thank you.

javascriptc#asp.net

Answer №1

ASP.NET utilizes HTML textboxes for input fields. By default, the ClientIDMode of controls is set to Predictable, resulting in auto-generated IDs in the rendered HTML.

// ASP.NET TextBox
<asp:TextBox ID="TextBox1"/>

// Rendered HTML
<input type="text" id="ContentPlaceHolder1_TextBox1_1"/>

To prevent this auto-generation of IDs, you can specify ClientIDMode="Static" in the TextBox, ensuring that the rendered HTML's ID matches the one supplied in the TextBox.

// ASP.NET TextBox
<asp:TextBox ID="TextBox1" ClientIDMode="Static"/>

// Rendered HTML
<input type="text" id="TextBox1"/>

Subsequently, you can use JavaScript to target these specific textboxes based on your requirements.

EDIT:

If targeting via ID is not ideal, CSS classes can be used to identify textboxes:

<asp:TextBox ID="TextBox1" CssClass="default-focus" />

With jQuery:

$('a[data-toggle="tab"]').on('shown.bs.tab', function (e) {
  var target = event.target.attributes.href.value;
  var $textbox = $(target + ' .default-focus');

  $textbox.focus();
});

Answer №2

One approach I found to be effective, although a bit longer, is by identifying the current navbar tab and then focusing on the first text box within that tab. Here is the code snippet:

$('a[data-toggle="tab"]').on('shown.bs.tab', function (e) 
{
    var target = e.target.attributes.href.value;
    if (target == "#tab1") 
     {
       $("#<%=txttab1.ClientID%>").focus(); 
     }
    else 
     {
        if (target == "#tab2") 
         {
           $("#<%=txttab2.ClientID%>").focus(); 
         }
        else 
         {
            if (target == "#tab3") 
            {
               $("#<%=txttab3.ClientID%>").focus(); 
            }
         }
      }
   }

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