Handling multiple submit buttons in ASP.NET MVC action methods

You can have multiple non nested forms all posting to different action methods from different submit buttons, you can also have multiple submit buttons posting to the same form and hence action method. In an MVC action method which is posted to by multiple submit buttons, how does one tell which button was responsible for the form post? Two easy ways are outlined on stackoverflow which I’m reposting as is here just to add a bit of extra ‘commentary’. Author is highlighted in yellow.

  1. In your razor mark-up each submit button has a different name property. Since only the name of the button which caused the submit will be posted in the HTTP request header, in your action method you can check the Request.Form collection to see which submit button property name exists and take action accordingly. In this case you don’t have to change your action method signature and given that the value property of your submit buttons is insignificant to determining which button was pressed, all your submit buttons can have the same label/text if needs be.
  2. In your razor mark-up each submit button has the same property name but different value, since only the name (and significantly value) of the button which caused the submit will be posted in the HTTP request header, you can add a property to your action method signature for MVC to bind to and populate. You can then check the value of that property and take action accordingly. This is the more MVC (and perhaps elegant) way I guess as your using default model binder rather than checking form collections directly, personally however I prefer the approach above as you don’t have to change the action method signature and the button test is not based on some visible on page property which could matter in some scenarios.image007

    Related Links

    http://stackoverflow.com/questions/19650345/mvc-razor-form-with-multiple-different-submit-buttons – Stackoverflow page with a number of solutions including the two above and an AJAX based one too.

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