I have a list in SharePoint Hosted Add-in and I want to customize this new item form to have my own customized form.
How can this be done?
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You have two options -
Either go for complete custom, which involves building up the form, actions (preferably using rest) for the new form. This is easier but more developement intensive.
you can add a js and css reference to your form and and implement enhancements accordingly. navigate to the new item page, edit it and add the references in a content editor webpart.