wordpress q: avoid double posts
wordpress q: avoid double posts
Out of context: Reply #5
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don't know of anything existing, but an idea that comes to mind would be to either grab all the ISBN numbers when the post write page loads, or lookup an ISBN via an AJAX call to a script. either way, i'd maybe start with the custom field template plugin to provide a field for ISBN on the post write page, then use javascript to capture what people input and match it against existing ISBNs and pop an alert if it exists. or maybe a sexy thickbox window.