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check db in js


jwk811

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on a form i have when the user clicks submit it checks to make sure all feilds are filled in and checks if the products ids they selected exist in the database... well thats what i want to happen.. would i have it set up in my js file the same as i would with php when i check the db? like figure out how many rows there are and if there are none show an alert.. how could i do that?
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