Is it possible to add a value to a submit button that gets passed in the params?

问题

I'm trying to add a "preview" button/page to my app.

Is there a way to add a different value to both my "post" and "preview" submit buttons that get passed in the params hash so that I can check which one was pressed in the controller and render the view accordingly?

Is this the best way to do this?

回答1:

The keys of the params hash are just the name value of an element.

If you had two buttons named "submit", one with value="post" and value="preview", then you could do something like:

if params[:submit] == "preview"

回答2:

You can add a button click event with javascript that will fill a hidden value and pass it along with the rest of your parameters. If using jQuery:

$("#post_button").click(function() {
   $("#form_action").val("post");
});

$("#preview_button").click(function() {
   $("#form_action").val("preview");
});

You'd then access the action in your controller using params['form_action']

来源：https://stackoverflow.com/questions/6348223/is-it-possible-to-add-a-value-to-a-submit-button-that-gets-passed-in-the-params