How can I pass in the contribution amount via URL?

Question

Is there a quick way to pass in the contribution amount via URL on custom amounts?

http://example.org/civicrm/contribute/transact?reset=1&id=2&price=35

I'm not looking to use a price set, just a total amount. Ideally, I'd like to pay an existing contribution and bring up a form with the amount and contribution to pay against with a credit card.

Answer 1

If a javascript solution suits you:

var a = document.createElement('a');
a.href = document.location;
var amount = a.search.match(/amount=([0-9]+)/)[1];
jQuery('#search input[name="q"]').val(amount);

• Visit this URL -- current page + ?amount=1234
• Paste the above code in your browser console
• Observe that the StackExchange search box now contains the value from the current page's query params.
• Add a free-text amount input to your contribute form.
• Use equivalent approach to populate that value on your own site.

Answer 2

I just tried this on CiviCRM 4.6.18 and successfully passed the amount through using the field Name or id (inspect the field to find the name or id) In the case of my form I did this: http://example.org/civicrm/contribute/transact?reset=1&id=2&price_5=35