Hi,

Have a new form action button which does a calculated delete, and I need an "are you sure" before running.
Is there an agreed way to do this ?

Thanks
Martin

SOLVED - I added a MyModelAdmin init function which required some JS in which I copied an action function from gridfield,js and added the test there.

.... easy when you know how !!!!!

Would be useful if you can show the actual code here too for others attempting the same :)

Also if you can can add [solved] to the initial forum post it help people find it while searching... just some friendly pointers to help fellow developers.

Ok sorry - thought a description would suffice....

Steps to implement this:-

a) get config and add component using an extension

<?php 

class MyModelAdminExtension extends Extension {

	function updateEditForm(&$form)
		{ 
		$f = $form->Fields()->fieldByName('ComingSoonItem'); // this is the DataObject name managed in MyAdmin.php
		// as MyAdmin manages more than one oage I need to be sure am on right page
		// so add try to add component if field exists 
		if ($f) $f->getConfig()->addComponent(new GridFieldBigDelButton('before'));

		}
}

b) then turn extension on in config.yaml

ModelAdmin:
  extensions:
    - MyModelAdminExtension

c) Write the new component added in a) - I started off with a copy of GridFieldExportgButton.php and amended the action handler
(Sorry can't give you the actual delete routine as it's sensitive ... but it does nothing clever - just deletes some rows in the gridfield

 
...
public function getHTMLFragments($gridField) {
		$button = new GridField_FormAction(
			$gridField, //grid on the form
			'DelHist', //name 
			'Delete Historic', //title
			'delhistaction', //action name
			null
		);
		$button->setAttribute('data-icon', 'delhistoric');
// add my special class here 
		$button->addExtraClass('deleteWithConfirm');
		return array(
			$this->targetFragment => '<p class="grid-delH-button">' . $button->Field() . '</p>',
		);
	}

	public function getActions($gridField) {
		return array('delhistaction');
	}

	public function handleAction(GridField $gridField, $actionName, $arguments, $data) {
		if($actionName == 'delhistaction') {
			return $this->handleBigDelete($gridField);
		}
	}
...

<?php

class MyAdmin extends ModelAdmin {
  private static $managed_models = array('ComingSoonItem','ServiceTypeItem'); 
  private static $url_segment = 'comingsoon'; 
  private static $menu_title = 'Manage coming Svcs';


public function init()
{
	parent::init();
	Requirements::javascript("themes/stmarts2014/js/ModelAdminExtra.js");
	
}

}

e) write the js file for d) - this is a copy of the no-ajax one from gridfield.js

// to add a confirm to delete button
(function($){
	
		$.entwine('ss', function($) {
		
		$('.action.deleteWithConfirm').entwine({
onclick: function(e){
				if(!confirm('Are you sure you want to delete ALL old records')) {
					e.preventDefault();
					return false;
				} else {
					this._super(e);
				}
			}		});

	});

}(jQuery));

f) That should be enough to get you started ....

Cheers
Martin