没有表单需要html5输入类型。它有用吗？

Question

I want to use: HTML 5 Required.

such as

<input type='text' required>

it only seems to work if the input type is in a form. Can I not use it on its own and then by javascript call some sort of validate first method ?

More comments following feedback:

I have

    <input id='name' type='text' required>
    <input id='surname' type='text' required>
    <input id='send' type='button' onclick ='send()'>

    function send() {
       if (document.getElementById('name').value == '') { alert('missing name'); return }
       if (document.getElementById('surname').value == '') { alert('missing surname'); return }

       // logic now...

    }

The bit where it checks the input params and sends alert that's the bit I would like to change by using HTML 5

Answer 1

Sure, use

document.getElementById('your_input_id').validity.valid

to check validity of field dynamically.

Answer 2

First, the "required" attribute will fire on "submit" event, so, I guess, no form — nothing will be submitted. Second, why there is the problem with form?

Answer 3

使用'required'时，只有在提交表单时才能使用。