How to use window.confirm in a JavaScript with unknown variables

Question

On my delete category page the user can pick the category it wishes to delete from a dropdown list (which is generated by rows in my database).
When the user hits the "Delete" button ths OnClick runs a JavaScript that sends the delete request to a .jsp page that handles all my insert, update and delete queries.
<input name="delete" type="button" id="delete" onClick="post('delete');return false;" value="Delete">
function post(actValue)
     document.MyForm.action.value = actValue ;
     document.MyForm.submit() ;
}So far, so good. But:
Before the site goes to this last jsp page I want a pop-up window that ask's for a confirmation of the delete-request.
So I changed the OnClick and I made another JavaScript::
<input name="delete" type="button" id="delete" onClick="delete('categoryName');return false;" value="Delete">
function deleteConfirm(categoryName)
     if( window.confirm("Are you sure you want to delete: " + categorieNaam + "?") == true)
          post('delete');
          return false;
}The problem is, when the page is loaded, we don't know yet what category the user wants to have deleted. So categoryName is unknown.
How can I make this work?

Answer 1

You have the category in a dropdown list?
<select name="catToDelete">
<option value="cat1">cat1</option>
<option value="cat2">cat2</option>
<option value="cat3">cat3</option>
</select>
You can use javascript attributes such as
var toDelete = document.all.catToDelete;
// the value it will submit
var selectedValue = toDelete.value;
// the selected index
var selectedIndex = toDelete.selectedIndex;
// the option that is selected
var selectedOption = toDelete.options[selectedIndex];
// the text of that option
var theText = selectedOption.textYou should be able to extract the info you need from that I hope.
Cheers,
evnafets