How to change default shipping method on button click (ajax call) on checkout page?
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Do you want to preselect a different shipping method depending on user input, or just change the default selected method globally? – Alex Dinca Jun 9 '14 at 13:58
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@alex.ayg, First one. depending on user input? – Manoj Kumar Jun 11 '14 at 5:14
You can do this from both PHP or JavaScript
If you go the PHP way, you need to edit the app/design/frontend/[package]/[theme]/template/checkout/onepage/shipping_method/available.phtml file, and around line 47 you have an if statement
if($_rate->getCode()===$this->getAddressShippingMethod())
when this condition returns true, it will set the corresponding method as selected. So you can update the if statement, and check other condition as well
If you want to go the JavaScript way, you need to edit the skin/frontend/base/default/js/onepagecheckout.js file
