How to create dynamic donation amount? (based on calc)

@tmf33 follow these step:
1.create set type donation form which accepts the custom amount
2.use this code as a base to set custom donation amount:

function __give_custom_fixed_amount( $current_form_id ) {
	$form_id = 22190;

	// Bailout.
	if (
		! is_user_logged_in()
		|| $form_id !== $current_form_id
	) {
		return;
	}

	// Add code here for donation amount calculation.
	$custom_amount = 20;
	?>
	<script>
		jQuery(document).ready(function ($) {
			var formWrapperContainder = $('#give-form-<?php echo esc_js( $form_id ); ?>-wrap'),
				formContainer = $( 'form', formWrapperContainder ),
				amountContainer = $('#give-amount', formContainer ),
				totalDonationAmountContainer = $('#give-final-total-wrap .give-final-total-amount', formContainer );

			amountContainer.val(<?php echo esc_js( $custom_amount ); ?>);
			amountContainer.prop( 'readonly', true );
			totalDonationAmountContainer.attr( 'data-total', '<?php echo esc_js( $custom_amount ); ?>' );
			totalDonationAmountContainer.html( Give.fn.formatCurrency(
				'<?php echo esc_js( $custom_amount ); ?>',
				{
					symbol: Give.form.fn.getInfo( 'currency_symbol',formContainer ),
					position: Give.form.fn.getInfo( 'currency_position', formContainer )
				},
				formContainer
			) );
		})
	</script>
	<?php
}

add_action( 'give_before_donation_levels', '__give_custom_fixed_amount' );

3. Update logic in above code to set $custom_amount.

Let me know if you need function help.

Wow! Thank you very much Ravinder! You guys really rock!

Your posted code goes into /my-theme/functions.php?
(have made a child theme for being able to survive updates so can insert it directly)

1.create set type donation form which accepts the custom amount

Check.

-> How can we get a custom (calculated) amount into the [amount] field?

For the calc of our:

$custom_amount

Are you able to give me a pointer where to look/start, because the amount needs to be calculated from give_donors_purchase_value (total spent by this donor) * a input variable like eg 0,1.

So the final calc would be something like
(give_donors_purchase_value + another_variable)*0,1

I even thought of doing the calc via wpdatatables plugin (as it′s doing the calc.. and i can input eg 0,1 for mulitplikation)

Sadly i′m not a coder.. and I′m having a hard time finding one with enough givewp knowledge. So I′m really thankful for your code above and any further input.

Add
Would it be a good idea to store some sort of transaction id or the timestamp of amount creation to prevent users from donating that same amount twice? (at some point in future the calced amount will change and will output different amount)

• This reply was modified 6 years, 3 months ago by tmf33. Reason: formatting
• This reply was modified 6 years, 3 months ago by tmf33.
• This reply was modified 6 years, 3 months ago by tmf33.

@tmf33 you can get donor total donation amount by following code.

$user = wp_get_current_user();
	$donor = new Give_Donor( $user->ID, true );
	$donor_total_donation_amount = $donor->id ? give_format_amount( $donor->purchase_value, array( 'currency' => give_get_option('currency') ) ) : 0;

	$custom_amount = $donor_total_donation_amount; // Add your logic here

@tmf33 If you like plugin then you can rate use: https://www.ads-software.com/support/plugin/give/reviews/

Awesome, thank you very very much!

I guess/hope the rest of it should be straight forward for a coder with wp experience.