If all the info the form needs is already present on the page then AJAX would be overkill and simple Javascript would do the job perfectly. This isn t tested, but;

<form id="myform">
  <input id="name" type="text" ... />
</form>

<tr> 
   <td onclick="populateFormElement( myform ,  name , this);">Bob</td>
</tr>

in javascript;

function populateFormElement(formName, inputName, element)
{
   document.formName.inputName.value = element.firstChild.data;
}

This works on a single element but should be a reasonable starting point as the process is easy to adapt to whole rows. Simply put the onclick event on the tr element and step through the various children a bit more to extract the relevant data.

Is there any way to do this without refreshing the page?

So, the key is asynchronous. The first A in Ajax stands for the very same word. You also tagged the question with Ajax. So I d expect that you have certain knowledge about that.

But the actual question doesn t require an ajaxical solution at all. You don t need to send and receive data from the server side at all, simply because all the needed data is already available inside the same HTML DOM tree.

The only feasible language which can access and traverse the HTML DOM tree at the client side is Javascript. It does not refresh the page at all. Just write code accordingly and execute it during the onclick event of the table row.

If you actually have a problem in writing the Javascript code accordingly, then you need to elaborate a bit more about it in your question. Do not ask "Is there any way?" --the answer is in 99.99% of the cases yes, but just ask "How do I do it?", supplied with relevant information about the coding you have as far.

Go get JQuery, and take a look at its AJAX functions. You will need to prepare the data in PHP, and create a special page to serve them. The AJAX function will be called when the user clicks on the button, it will load the data from the server, then it will parse them, and fill the grid...