For Magento 1.4.1
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If you configure onepage checkout in Magento store, buyers will have no chance to use discount coupon. However, there’s way to do so with little customization. I have implemented coupon in review step of onepage checkout.
1. Override Onepage checkout model – core/Mage/Checkout/controllers/OnepageController.php. Here mainly you have to override _getReviewHTML() function and add function to save/remove coupon code.
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function _getReviewHtml()
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{
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$text = $this->getLayout()->getBlock('root')->toHtml();
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$text .= '<form id="discount-coupon-form" action="/checkout/onepage/coupon/" method="post">';
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$text .= '<label for="coupon_code"> ' . $this->__('Enter your coupon code if you have one.') . '</label><br />';
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//$text .= '<input type="hidden" name="remove" id="remove-coupone" value="0" />';
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//if(!strlen($this->getCouponCode()))
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$text .= '<input class="input-text" id="coupon_code" name="coupon_code" value="' . $this->_getQuote()->getCouponCode() . '"/>';
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$text .= '<input type="hidden" id="coupon" name="coupon" value="1"/>';
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$text .= ' <button type="button" class="button" onclick="updateCupon()" value="' . $this->__('Apply Coupon') .'"><span>' . $this->__('Apply Coupon') .'</span></button>';
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$text .= '</form>';
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return $text;
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}
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/**
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* Coupon check
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*/
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function couponAction()
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{
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$this->loadLayout('checkout_onepage_review');
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$this->couponCode = (string) $this->getRequest()->getParam('coupon_code');
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Mage::getSingleton('checkout/cart')->getQuote()->getShippingAddress()->setCollectShippingRates(true);
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Mage::getSingleton('checkout/cart')->getQuote()->setCouponCode(strlen($this->couponCode) ? $this->couponCode : '')
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->collectTotals()
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->save();
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$result['goto_section'] = 'review';
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$result['update_section'] = array(
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'name' => 'review',
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'html' => $this->_getReviewHtml()
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);
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$this->getResponse()->setBody(Mage::helper('core')->jsonEncode($result));
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}
couponAction() update cart validating coupon number. May be you want to improve _getReviewHTML(), but I wanted quick solution, and without modifying core.
2. Edit onepage.phtml template. You need to add some javascript code.
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<script type="text/javascript">
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//<![CDATA[
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function updateCupon() {
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$('discount-coupon-form').request({
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method: 'post',
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onComplete: payment.onComplete,
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onSuccess: payment.onSave,
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onFailure: checkout.ajaxFailure.bind(checkout),
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})
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}
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//]]>
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</script>
This script will submit coupon with ajax using post method. And it will update review HTML using regular checkout function.
For Magento 1.4.1
