How to implement the Form form to automatically submit the form by pressing Enter

1. There is only one input tag in the form. Pressing the Enter key will automatically submit the form.

When there is only one in the form, pressing the Enter key will Automatically submit the form.

<form id=&#39;form1&#39; action=&#39;a1.jsp&#39; method=&#39;post&#39;>
<input type=&#39;text&#39; name=&#39;name&#39; />
</form>

If you don’t want it to be automatically submitted, you can do this:

Add another pressing Enter will not automatically submit, but an unknown message will be displayed on the page Yun's input box is quite awkward, so I found two solutions from the Internet:

(1) Add an do not display the input box, and then press Enter It will not be submitted later:

<form id=&#39;form1&#39; action=&#39;a1.jsp&#39; method=&#39;post&#39;>
<input type=&#39;text&#39; name=&#39;name&#39; />
<input style=&#39;display:none&#39; />
</form>

(2) Add an onkeydown event, and then press Enter and it will not be displayed:

<form id=&#39;form1&#39; action=&#39;a1.jsp&#39; method=&#39;post&#39;>
<input type=&#39;text&#39; name=&#39;name&#39; onkeydown=&#39;if(event.keyCode==13) return false;&#39;/>
</form>

ps: I have no idea about this event.keyCode==13 I understand, I just understand it as a judgment condition, but I still don’t understand the details. If you understand, please feel free to enlighten me.

If you want to add a carriage return event, you can add a judgment submission form in the onkeydown event:

<form id=&#39;form1&#39; action=&#39;a1.jsp&#39; method=&#39;post&#39;>
<input style=&#39;display:none&#39; />
<input type=&#39;text&#39; name=&#39;name&#39; onkeydown=&#39;if(event.keyCode==13){gosubmit();}&#39; />
</form>

2. Regarding whether automatic submission is needed

We sometimes want to press the Enter key in the text box (input element) to submit the form (form), but sometimes we don’t want this. For example, for search behavior, you want to directly press the Enter key to submit the form immediately after entering the keywords. For some complex forms, you may want to avoid accidentally pressing the Enter key to trigger the form submission before completing the form filling.

To control these behaviors, there is no need to resort to JS. The browser has already done this for us. Here are a few rules:

If there is a button with type="submit" in the form, the Enter key will take effect.

If there is only one input with type="text" in the form, no matter what type the button is, the Enter key will take effect.

If the button is not input, but button, and no type is added, the default is type=button in IE and type=submit in FX.

Other form elements such as textarea and select will not be affected. Radio checkbox will not affect the triggering rules, but it will respond to the enter key under FX but not under IE.

The input of type="image" has the same effect as type="submit". I don't know why such a type is designed. It is not recommended. It should be more appropriate to use CSS to add a background image.