Develop Reference

How to reset inbuilt HTML input validity

In Firefox, at least, native HTML5 input element validity, e.g. a required text field, shows up as a red border, but only after interaction.
e.g. in the example below, I initially see two input boxes. If I type something in one of them, delete it and press Tab, the first one now glows red to show me it's invalid (because it's required).
Using Javascript, how can I reset the form to the pristine initial state, where the red border is not showing?
<form action='#'>
<div>
<input required name="a" type="text" />
<input required name="b" />
</div>
</form>

The only reliable way I've found is to reset the form, either via a <button type="reset"> or through form.reset().
Note, however, that this will wipe the values of any and all fields in the form, so if you need these to remain you'll need to repopulate their values after the reset is done.
Setting <form novalidate> will work, however subsequently removing the novalidate attribute will make the field(s) show errors again.

Submit a standard HTML form with React input fields

Sometimes I just want to submit a "normal" form, but have the input fields in React (of styling reasons).
But the form doesn't seem to "see" the values of the input fields when submitting.
<form action="comments" method="post">
<label>
Name:
<input
className={styles.input}
defaultValue="Bob"
type="text"
ref={this.input} />
</label>
<input type="submit" value="Submit" />
</form>
Is there a way to accomplish something like the above, i.e. posting a form without having to create an onSubmit event handler that referes to every single field in the form?
Ps. I'm aware that the default React way is to include state, but that increases the boilerplate code even more.

use name tag in your input
e.g.
<input name="comment" type="text" defaultValue="Bob"/>

HTML5 Required input, removing and adding on the fly not working

I am trying to remove a required attribute from an input on the fly. The general idea is I have a field that is set to required, this field has custom validation with the pattern attribute. When the user clicks a button I am attempting to remove the required field.
I have put together a fiddle here:
https://jsfiddle.net/paulmatos/t1p1wub3/
HTML:
<form>
<input type="text" oninvalid='this.setCustomValidity("Enter a number in the Specified Range");' oninput="try{setCustomValidity('')}catch(e){}" pattern="[0-9]" required="required" name="password" id="password" />
<input type="text" required="required" name="temp" />
<input type="submit" class="btn btn-primary form-control" value="Submit" />
<div class="btn btn-default removeReq">Remove Required</div>
</form>
Jquery:
$('.removeReq').click(function() {
$('#password').removeAttr('required');
});
The issue I am experiencing has to do with the order of submission.
If you click remove required, and then submit the form you will see that it works as intended.
However, if you do those steps in reverse order, click submit first, then remove and try and submit again, you will notice I am still getting the validation error on the first input.
Is there anyway to get around this with this intended functionality, I am trying to get this to work just with the html5 validation.

I did have a look at the fiddle and the only way I could get the behaviour you wanted was by literally detaching, cloning and reinserting the field. Works tho.
$('.removeReq').click(function() {
var password = $('#password').removeAttr('required oninvalid oninput pattern').detach().clone();
$('form').prepend(password);
});
https://jsfiddle.net/t1p1wub3/2/

Think you are getting this due to the code in the oninvalid handler. Try this.
$('.removeReq').click(function() {
$('#password').removeAttr('required oninvalid');
});

You can try this instead of removeAtt():
$('.removeReq').click(function() {
$('#password').prop('required', false);
});

jQuery Trigger Reset Only Resetting Some Forms

I have many forms on my page that are DYNAMICALLY added and I have a button that I want to trigger a reset to all the forms on the page except one.
An example of a dynamically added form is:
<form>
<label for="code">Question code:</label>
<input type="text" id="code" name="code" maxlength="25" class="used"/>
<div class="clear"></div>
<label for="title">Question:</label>
<input type="text" name="titl" name="title" maxlength="255" class="used"/>
<div class="clear"></div>
<label for="hint">Hint:</label>
<input type="text"id="hint" name="hint" class="used"/>
<div class="clear"></div>
<input type="hidden" name="type" value="tapper" class="used">
<input type="hidden" name="optionsType" value="none" class="used">
<input type="reset" value="Cancel" class="delete-button">
<input type="button" value="Add" class="action-button" onclick="pushQuestion(this);">
</form>
Also, after each form is dynamically added, I call:
$('form').on('submit', function (e) {e.preventDefault()});
Now, when I want to reset the forms, I call the following:
$('form').trigger('reset');
When entering this into the console, I get an array back with all the DOM forms. Some forms get reset, but others are unaffected. There are no errors being reported. Does anyone have any thoughts as to why some get reset while others do not?
EDIT Thanks for the help, but the issue has been resolved. See the problem in the comments below

After a few hours of tinkering, it was discovered that the issue was the result of the way the forms were cloned.
I was doing a deep clone of the existing forms which was yielding an odd state of the form which means that when .trigger('reset') was "triggered", it would reset the form to the default state of the clone which may or may not have included some original data yielding a reset that did not appear to be doing anything.
A workaround was to first fire a loop over all the inputs with .attr(value,'') to clear the attribute value after cloning. Then the .trigger('reset') functioned as expected.

I've noticed some inconsistencies with form handling among the various browsers. One gotcha is that the less standards-compliant browsers require an input or button with type=submit for some things to function correctly. I know this is that case at least with submitting a form by pressing the enter key in any text field.
Maybe try adding an <input type='submit'/>?

Show/Hide previous form field entries

I was wondering if someone knows what controls the showing of previous form field entries in a form.
So for example, if in the name field, I go to type 'John' it appears below the field. Is that a feature of the browser or is it javascript or something?
Also, if it is the browser, is there a way I can turn this off for a given form?

You might be looking at autocomplete, if so turn it off with autocomplete="off" within the HTML of the relevant field:
<input type="text" name="firstname" autocomplete="off" />
References:
input element.

It's made by the browser, if you're working with HTML5 you can set a attribute to the input-element to remove it.
<input type="text" autocomplete="off" />