title: How to check if a asp text box is empty or not
body: <blockquote>
    <p><strong>Possible Duplicate:</strong><br>
    <a href="https://stackoverflow.com/questions/3502354/textbox-empty-check-using-javascript">textbox empty check using javascript</a>  </p>
  </blockquote>
  
  
  
  <p>I have a asp.net button and a asp.net textbox, when I click on button, I want to check if textbox is empty or not but not sure how I can do that,</p>
  
  <pre><code>&lt;div&gt;
      &lt;asp:TextBox ID="txtEU" runat="server"&gt;&lt;/asp:TextBox&gt;
  &lt;/div&gt;
  &lt;div&gt;
      &lt;asp:ImageButton ID="button" runat="server" OnClientClick="MyFunction(); return false;" ImageUrl="/myfolder/abc.png" /&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>in my JavaScript I am doing,</p>
  
  <pre><code>   &lt;script type="text/javascript"&gt;
      function doWork() 
      {  
          if($input[]
  </code></pre>
  
  <p><strong>not sure  how to check if its empty or not, if its empty then I am doing something if not then it should call a code behind method for that button.</strong></p>