如何提交没有操作的表单或提交按钮

Question

I was looking at one image web site and was puzzled by the javascript they used. The web site has a image, below that there is a text input field you can input your comments. After you input your comments, you press the enter key to commit the comment.

The html looks like this:

 <form class="-cx-PRIVATE-PostInfo__commentCreator" data-reactid=".0.1.0.0.0.2.2.1">
   <input class="-cx-PRIVATE-PostInfo__commentCreatorInput" placeholder="Add a comment…" type="text" value="" data-reactid=".0.1.0.0.0.2.2.1.0">
 </form>

There is no action in the form and no submit button. How can they submit the form?

Answer 1

The form's action attribute will default to the current URL.

Try filling in some text and hitting enter:

<form>
    <input type="text" name="lookInTheUrlAfterHittingEnter" />
</form>

As @Traktor53 says, hitting enter whilst focus is on the text input will submit the form.

Answer 2

Input elements of type text (for a single line of text) have submitted their form if the enter key is pressed while filling them in since the year dot AFAIK. I did not find any mention of this in HTML5's documentation for this input type element.