How to create a woocommerce product from frontend form submission with form validation

Question

Help Needed: I'm trying to create a form that will publish a wooCommerce product from front-end after following this question (Add Woocommerce Temporary product). The issue i'm facing now is that each time i submit the form i get this error (if i don't validate the form) Warning: Cannot modify header information - headers already sent by (output started at C:\xampp\htdocs\WOOstores\wp-includes\class.wp-styles.php:225) in C:\xampp\htdocs\WOOstores\wp-includes\pluggable.php on line 1219. I really would like to validate the form before submission and all i have been trying throws error related to WP_Error() below is the error i get when i try validating the form fields;

Warning: A non-numeric value encountered in C:\xampp\htdocs\WOOstores\wp-content	hemes\adrianstores\woocommerce\myaccount\custom-orders.php on line 73 // Will indicate this line in my below code

Notice: Object of class WP_Error could not be converted to int in C:\xampp\htdocs\WOOstores\wp-includes	axonomy.php on line 2297

Notice: Object of class WP_Error could not be converted to int in C:\xampp\htdocs\WOOstores\wp-includes	axonomy.php on line 2297

Notice: Object of class WP_Error could not be converted to int in C:\xampp\htdocs\WOOstores\wp-includes\functions.php on line 3843

The product is being created with no problem, exactly how it should work ( if i don't validate the field), But i really want to validate the form but i'm having problems doing that. Below is the full code

PHP CODE which lives on the same page as the HTML form

function get_product_category_by_id( $category_id ) {
    $term = get_term_by( 'id', $category_id, 'product_cat', 'ARRAY_A' );
    return $term['name'];
}
$product_CO_terms = get_product_category_by_id( 15 );

$ProductTitle = $ProductURL = $ProductPriceValue = $ProductWeight = $ExchangeRate = "";
$errorpTitle = $errorpUrl= $errorpPrice = $errorpWeight = "";

if ( 'POST' == $_SERVER['REQUEST_METHOD'] ) {

$ExchangeRate       = test_input($_POST['amountNGNUpdated']);
$ProductCategory    = test_input($_POST['productCategoryUpdate']);

$ProductTitle = test_input($_POST['co_productTitle']);
$ProductURL = test_input($_POST['co_productLink']);
$ProductPriceValue  = test_input($_POST['co_productPriceUSD']);
$ProductWeight  = test_input($_POST['co_productWeightKG']);


/* THIS IS THE VALIDATION I DID, Which i dont know why it giving me the WP_Error() error
if ( empty($ProductTitle) ) {
    $errorpTitle = __('Product Title is required. e.g. iPhone XS Max 16GB Silver', 'text-domain');
} else {
    $ProductTitle = test_input($_POST['co_productTitle']);
}

if ( empty($ProductURL) ) {
    $errorpUrl = __('Product URL is required. e.g. http://amazon.com/.../', 'text-domain');
} else {
    $ProductURL = test_input($_POST['co_productLink']);
}

if ( empty($ProductPriceValue) || $ProductPriceValue == 0 ) {
    $errorpPrice = __('Product Price is required.', 'text-domain');
} else {
    $ProductPriceValue  = test_input($_POST['co_productPriceUSD']);
}

if ( empty($ProductWeight) ) {
    $errorpWeight = __('Product Weight is required. Weight unit should be in KG. You can use the Weight converter to convert your weight from lbs to kg.', 'text-domain');
} else {
    $ProductWeight  = test_input($_POST['co_productWeightKG']);
}*/

$NewProductPrice = $ProductPriceValue * $ExchangeRate; //This is the line 73 in which i was getting "A non-numeric value encountered"

//add them in an array
$post = array(
    'post_status' => "publish",
    'post_title' => $ProductTitle,
    'post_type' => "product",
);

//create product for product ID
$product_id = wp_insert_post( $post, __('Cannot create product', 'izzycart-function-code') );

//type of product
wp_set_object_terms($product_id, 'simple', 'product_type');

//Which Category
wp_set_object_terms( $product_id, $product_CO_terms, 'product_cat' );

//add product meta
update_post_meta( $product_id, '_regular_price', $NewProductPrice );
update_post_meta( $product_id, '_price', $NewProductPrice );
update_post_meta( $product_id, '_weight', $ProductWeight );
update_post_meta( $product_id, '_store_product_uri', $ProductURL );
update_post_meta( $product_id, '_visibility', 'visible' );
update_post_meta( $product_id, '_stock_status', 'instock' );

//Add product to Cart
return WC()->cart->add_to_cart( $product_id );

What i would like to achieve with the above line return WC()->cart->add_to_cart( $product_id ); is to the add product to cart and redirect to cart. (using return give me a blank page but adds the product to get which makes the line not the best approach)

HELP I NEED;
1. How to make the form validate the field. If any field is empty, it should throw an error message at the top of the form. Where we have

and if all field passes the validation, it should throw a success message and proceed to creating the product.
2. After creating the product, it should add the product to cart and redirect to cart.

Thanks

Kolawole Emmanuel Izzy · Accepted Answer

I have been able to validate the form and create product has i wanted it to work. Just incase someone out there is facing similar issue and would want the answer to this question.

PHP CODE:

$ProductTitle = $ProductURL = $ProductPriceValue = $ProductShippingFee = $ProductWeight = "";
$error_pTitle = $error_pLink = $error_pPrice = $error_pShipping = $error_pweight = $success_call = "";
$productPrice_converted = "";
if ( 'POST' == $_SERVER['REQUEST_METHOD'] && isset($_REQUEST['co_submit']) ) {
$ExchangeRate       = test_input($_POST['amountNGNUpdated']);
$ProductCategory    = test_input($_POST['productCategoryUpdate']);

//Validate Product Title
if( empty( test_input($_POST['co_productTitle']) ) ) {
    $error_pTitle = __('Product Title is required.', 'izzycart-function-code');
} else {
    $ProductTitle = test_input($_POST['co_productTitle']);
}

//Validate Product URL
if( empty( test_input($_POST['co_productLink']) ) ) { 
    $error_pLink = __('Product Link is required.', 'izzycart-function-code');
} elseif ( !preg_match("@^https?://@", test_input($_POST['co_productLink']) ) ) {
    $error_pLink = __('Please enter a url that starts with http:// or https://', 'izzycart-function-code');
} elseif ( isset($_POST['co_isAmazon']) == 1 && strpos($_POST['co_productLink'], 'amazon') === false ) {
    $error_pLink = __('This is not an Amazon product. Please enter a valid amazon product.', 'izzycart-function-code');
} else {
    $ProductURL = test_input($_POST['co_productLink']);
}

//Validate Product Price
if( empty( test_input($_POST['co_productPriceUSD']) ) || test_input($_POST['co_productPriceUSD']) == 0 ) { 
    $error_pPrice = __('Product Price is required.', 'izzycart-function-code');
} else {
    $ProductPriceValue = test_input($_POST['co_productPriceUSD']);
}

//Validate Product Shipping
if( empty( test_input($_POST['co_productShippingFee']) ) ) { 
    $error_pShipping = __('Product Shipping fee is required.', 'izzycart-function-code');
} else {
    $ProductShippingFee = test_input($_POST['co_productShippingFee']);
}

//Validate Product Weight
if( empty( test_input($_POST['co_productWeightKG']) ) || test_input($_POST['co_productWeightKG']) == 0 ) { 
    $error_pweight = __('Product Weight is required. Weight are in KG, use the weight converter to covert your lbs item to KG', 'izzycart-function-code');
} else {
    $ProductWeight  = round(test_input($_POST['co_productWeightKG']), 2);
}

if ($ProductPriceValue && $ExchangeRate ) {
    $productPrice_converted = $ProductPriceValue * $ExchangeRate;
}

//No Errors Found
if ( $error_pTitle == "" && $error_pLink == "" && $error_pPrice == "" && $error_pShipping = "" $error_pweight == "" ) {
    //add them in an array
    $post = array(
        'post_status' => "publish",
        'post_title' => $ProductTitle,
        'post_type' => "product",
    );

    //create product for product ID
    $product_id = wp_insert_post( $post, __('Cannot create product', 'izzycart-function-code') );

    //type of product
    wp_set_object_terms($product_id, 'simple', 'product_type');

    //Which Category
    wp_set_object_terms( $product_id, $product_CO_terms, 'product_cat' );

    //add product meta
    update_post_meta( $product_id, '_regular_price', $productPrice_converted );
    update_post_meta( $product_id, '_price', $productPrice_converted );
    update_post_meta( $product_id, '_weight', $ProductWeight );
    update_post_meta( $product_id, '_store_product_uri', $ProductURL );
    update_post_meta( $product_id, '_visibility', 'visible' );
    update_post_meta( $product_id, '_stock_status', 'instock' );

    //Add Product To cart
    $found = false;
    if ( sizeof( WC()->cart->get_cart() ) > 0 ) {
        foreach ( WC()->cart->get_cart() as $cart_item_key => $values ) {
            $_product = $values['data'];
            if ( $_product->get_id() == $product_id )
                $found = true;
        }
        // if product not found, add it
        if ( ! $found )
            WC()->cart->add_to_cart( $product_id );
    } else {
        // if no products in cart, add it
        WC()->cart->add_to_cart( $product_id );
    }

//Sending Mail to Admin 
    //I installed an application hMailServer on my PC, because i was working on a local
    //server (XAMPP) and it wont send out mail(), so i wasn't getting the success message
    //as soon as i installed the application.. the mail() function worked and i get the success message
    //and product is added to cart. Though didn't receive the mail in my inbox for reason i don't know but i 
    //will update this answer to confirm that the sending mail works. but the fact that i got the success message. it will work on a LIVE server
    $message_bd = '';
    unset($_POST['co_submit']);

    foreach ($_POST as $key => $value) {
        $message_bd .= "$key: $value
";
    }

    $to = $AdminEmailFor_CO; //This is a custom field i created which stores the admin email in the database and can be changed from wordpress dashboard (you can write directly your admin email)
    $subject = $SubjectFor_CO; // Same as the subject. They are stored the in options table
    $header = 'From: webmaster@example.com' . "
" .
                'Reply-To: webmaster@example.com' . "
" .
                'X-Mailer: PHP/' . phpversion();
    if ( mail($to, $subject, $message_bd ) ) {
        //Success Message & reset Fields 
        $success_call = sprintf(__('Success: Product has been added to your cart. Click the view cart button below to proceed with your custom order. View Cart', 'izzycart-function-code'), wc_get_cart_url() );
        $ProductTitle = $ProductURL = $ProductPriceValue = $ProductWeight = "";
        $productPrice_converted = 0;
    }
  }
}
function test_input($data) {
  $data = trim($data);
  $data = stripslashes($data);
  $data = htmlspecialchars($data);
  return $data;
}

HTML FORM has been updated to the below

The result looks like this

showing the validation

How to create a woocommerce product from frontend form submission with form validation

Answers (1)

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