Question

I have an ASP.NET user control that contains a textbox which has an AJAX CalendarExtender control which allows users to select a date which then populates the textbox.

I can clear the textbox value using a submit button and setting the value to null in the code behind, but I need to set the value to “” in the textbox using Javascript.

I have tried the following javascript but it didn’t work:

function ClearTextBox() 
{
    document.getElementsByName('TextBox1').Value = "";
}

What javascript should I use?

Answer 1

• Instead of Value => value. JavaScript is case sensitive…
• getElementsByName returns an array of elements so select the first element with [0]

---

document.getElementsByName('TextBox1')[0].value = "";

or select the element by id:

document.getElementById('TextBoxId').value = "";