Create widget that filters posts on current page based on entered value

Question

Can somebody point me in the right direction wouldnt have a clue how to start programming this.

I want to filter post based on price (custom value) thru a widget. So lets say you click on a post category you get a list of all the posts in that category, but then I want to give the user the option to filter on price. Been searching for a widget that does this but havent found one.

Answer 1

To search through the category, I think you would want to use get_posts to fetch all the posts in the particular category and then go through them with a for loop and check the custom value in each one and then echo the appropriate items to a results page.