Initial commit

.gitignore

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+.idea/
+composer.lock
+vendor/
+resources/

README.md

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 # silverstripe-gridfield-newwindowaction
 Adds a button to the SilverStripe GridField that causes an action to open in a new window.
+
+## How to install
+`composer require twohill/silverstripe-gridfield-newwindowaction`
+
+## How to use
+
+Simply replace your normal `SilverStripe\Forms\FormAction` with `Twohill\Forms\NewWindowAction`
+
+## Typical usecase
+
+### MyModelAdmin.php
+
+```php
+<?php
+
+namespace My\Admin;
+
+use My\Model;
+use My\ModelGridFieldFormItemRequest;
+use SilverStripe\Admin\ModelAdmin;
+use SilverStripe\Forms\GridField\GridField;
+use SilverStripe\Forms\GridField\GridFieldDetailForm;
+
+class MyModelAdmin extends ModelAdmin
+{
+    // Usual ModelAdmin stuff here
+    private static $managed_models = [Model::class];
+    public function getEditForm($id = null, $fields = null)
+    {
+        $form = parent::getEditForm($id, $fields);
+
+        /** @var GridField $gridField */
+        $gridField = $form->Fields()->first();
+        $config = $gridField->getConfig();
+        /** @var GridFieldDetailForm $myForm */
+        $myForm = $config->getComponentByType(GridFieldDetailForm::class);
+        $myForm->setItemRequestClass(ModelGridFieldFormItemRequest::class);
+
+        return $form;
+    }
+
+}
+```
+
+### ModelGridFieldFormItemRequest.php
+
+```php
+<?php
+
+namespace My\Admin;
+
+use My\Model;
+use Twohill\Forms\NewWindowAction;
+use SilverStripe\Versioned\VersionedGridFieldItemRequest;
+
+class ModelGridFieldFormItemRequest extends VersionedGridFieldItemRequest
+{
+
+    private static $allowed_actions = [
+        'edit',
+        'view',
+        'ItemEditForm',
+        'generatePDFInvoice',
+    ];
+
+
+    protected function getFormActions()
+    {
+        $actions = parent::getFormActions();
+
+        $actions->push(NewWindowAction::create('generatePDFInvoice', 'Generate PDF Invoice')
+                    ->setUseButtonTag(true)
+                    ->addExtraClass('btn-primary font-icon-block-content'));
+
+
+        return $actions;
+    }
+
+
+    public function generatePDFInvoice() {
+            /** @var Model $invoice */
+            $invoice = $this->getRecord();
+            //$invoice->generatePDFInvoice();
+        }
+}
+```

composer.json

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+{
+  "name": "twohill/silverstripe-gridfield-newwindowaction",
+  "description": "Adds a button to the SilverStripe GridField that causes an action to open in a new window.\n",
+  "homepage": "https://github.com/twohill/silverstripe-gridfield-newwindowaction",
+  "keywords": ["silverstripe", "gridfield", "newwindow"],
+  "license": "BSD-3-Clause",
+  "authors": [
+    {"name":  "Al Twohill", "email":  "[email protected]"}
+  ],
+  "require": {
+    "silverstripe/cms": "^4"
+  },
+  "autoload": {
+    "psr-4": {
+      "Twohill\\": "src/"
+    }
+  }
+}

src/Forms/NewWindowAction.php

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+<?php
+namespace Twohill\Forms;
+
+use SilverStripe\Control\Controller;
+use SilverStripe\Forms\FormAction;
+
+class NewWindowAction extends FormAction
+{
+    /**
+     * Gets the HTML representing the button
+     * @param array $properties
+     * @return string
+     */
+    public function Field($properties = array())
+    {
+        return sprintf(
+            '<a class="btn %s" href="%s" target="_blank">%s</a>',
+            $this->extraClass(),
+            $this->Link(),
+            $this->Title()
+        );
+    }
+
+    /**
+     * Return a link to this field.
+     *
+     * @param string $action
+     *
+     * @return string
+     */
+    public function Link($action = null)
+    {
+        $link = Controller::join_links($this->form->getController()->Link(), $this->actionName(), $action);
+        $this->extend('updateLink', $link, $action);
+        return $link;
+    }
+}