How to get custom module controller url

Question

I have custom admin page edittab.phtml in that page I have ajax call

function deleteOldLens(id)
{
 var url = "<?php echo $this->getUrl('/customtabs/ajax/deletelens');?>";
 new Ajax.Request(url, {
 method:'post',
 parameters: {
 id: id
 }
 , requestHeaders: {Accept: 'application/json'},
 onSuccess: function(transport) {
 retjson = transport.responseText.evalJSON();
 alert( retjson.resp );
 }
 }); 
}

and in module customtabs/controllers/ajaxController.php I have deletelensAction().This code gives me error like

 http://localhost/optishop/index.php/admin/customtabs/ajax/key/c86e7acf7f7d45339bf50a7ab6efc4b2/?isAjax=true
 404 Not found

I have also tried other solutions like

 Mage::app()->getStore()->getUrl('*/ajax/deletelens');
 Mage::app()->getUrl('customtabs/ajax/deletelens') 

• mbalparda: Please try var url = "<?php echo $this->getUrl('customtabs/ajax/deletelens/');?>"; (note the removal of the first /)

Answer 1

You should use

var url = "<?php echo
$this->getUrl('customtabs/ajax/deletelens/');?>";

Note the removal of the first /.

Answer 2

You can get controller url by

$this->getUrl('YourModulefontName/ajax/deletelens');