How to get all the controls in page using javascript in ASP.net page
<p>I have a page with a tab control and each control has almost 15 controls. In total there are 10 tabs and about 150 controls in a page (controls like drop down list, textbox, radiobutton, listbox only).</p>

<p>My requirement is that there is a button (submit) at the bottom of the page. I need to check using JavaScript that at least 3 options are selected out of 150 controls in that page irrespective of the tabs which they choose. </p>

<p>Please suggest the simplest and easiest way which this could be done in JavaScript on my aspx page.</p>
