New answers tagged aspx
No need to do this via SharePoint Designer and you should try to Open List > List Settings > Advance Settings > scroll down to dialogs check Yes as shown below.
No need to re-invent the wheel in SharePoint Designer. Adjust the list settings > Advanced settings > Launch form in dialog > Yes
FieldName is the corresponding column name in the list. Do not used display name. Using Display name also works but when you change display name the control won’t render. So I always recommend using columns name for FieldName. Kindly check Note under the step 4 in below article. SharePoint List NewForm Customization in SharePoint Hosted App
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