How can you add Attributes to controls in template

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If TextBox1 is a control on a WebForm, we can add Javascript function by
adding attribute in the Page_Load event like:

protected void Page_Load(object sender, EventArgs e)
{
TextBox1.Attributes.Add("onclick", "return MyFunction('Tiger')");
}

But if the TextBox is in a template, How can we add the attributes with
codes?

[alvinz_c]

You can add it in the ItemCreated/ItemDataBound event of the data-bound control

protected void My_ItemCreated(Object sender, DataGridItemEventArgs e)
{
if(e.Item.ItemType == ListItemType.Item || e.Item.ItemType ==
ListItemType.AlternatingItem)
{
TextBox TextBox1 = (TextBox).e.Item.FindControl("TextBox1");
TextBox1.Attributes.Add("onclick", "return MyFunction('Tiger')");
}
}