HTML Form Tags

HTML defines a couple tags for describing forms that are part of a document (web page).

Here’s how a simple form looks in HTML:

  <input type="text">
  <input type="submit">

If you copy this HTML code to a file, and open the file in your browser it will look similar to this:


You can see that the two <input> tags are rendered (displayed) in different ways because they have two different types: text and submit. One is a text input field, and one is a button to submit the form. In modern HTML there are lots of other input element types. You can find a full list here.

Let’s make our little Sinatra application serve this form.

Make a new template file monstas.erb in your view directory and add the the HTML above. Then replace your get '/monstas/:name' route with the following:

get "/monstas" do
  erb :monstas

Restart the server and go to http://localhost:4567/monstas. You should see something similar to our screenshot above.

Now, this form isn’t very useful, yet. If you submit it (enter something, and click “Submit”) nothing much will happen. It clears the input element, and appends a question mark to the URL for some reason, but that’s it.

What’s happening here?