Develop Reference

HTML form submit POSTS input button/submit values; JavaScript form submit does not

So this has been bugging me for some time. I discovered a page that was intermittently submitting form contents twice. For simplification, the inputs are a text field and a button. Upon further inspection, I noticed one form submission included the text and button inputs and the other submission only sent the text input.
I set up a test page to troubleshoot. I put it up on jsfiddle, but I don't think it'll be much help, since I cannot see the values passed using an HTTP Proxy tool such as Fiddler.
https://jsfiddle.net/9xL5w9t2/
<form method="post" action="www.google.com" onsubmit="alert('form submitted');" id="form1" name="form1name">
<input type="submit" value="submit form" id="submitbtn1" name="submitbtn1name" />
<input type="text" id="text1" value="123" name="text1name" />
</form>
<form method="post" action="www.google.com" onsubmit="alert('form submitted');" id="form2" name="form2name">
<input type="button" value="submit form" onclick="alert('button clicked to submit form'); document.form2name.submit();" id="submitbtn2" name="submitbtn2name" />
<input type="text" id="text2" value="123" name="text2name" />
</form>
<form method="post" action="www.google.com" id="form3" name="form3name">
<input type="button" value="submit form" onclick="alert('button clicked to submit form'); document.form3name.submit();" id="submitbtn3" name="submitbtn3name" />
<input type="text" id="text3" value="123" name="text3name" />
</form>
<form method="post" action="www.google.com" onsubmit="alert('form submitted'); this.submit();" id="form4" name="form4name">
<input type="submit" value="submit form" id="submitbtn4" name="submitbtn4name" />
<input type="text" id="text4" value="123" name="text4name" />
</form>
Form 1: Submits text and button
Form 2: Submits text
Form 3: Submits text
Form 4: Submits twice. 1) Submits text 2) Submits text and button
From the looks of it, submitting using HTML Form submit sends over text and button inputs. But submitting the form using JavaScript sends over just the text input. No button.
What is the explanation for this behavior? Why does a JavaScript form submit send over text input only, yet HTML form submit sends over both text and button inputs?
Is this by design? If so, what would be the reason(s)? Seems inconsistent to have your HTML parser send the button value, yet your JS engine does not.
Thank you for any help.

Form 1: Submits text and button
.. default behavior, using a input type submit
Both input controls get submitted because you've clicked the submit button.
Add another submit-button. You will see that only the button dispatching the submit is included in the post data.
So.. what's the reason for that: This way you can add two buttongs, e.g. "cancel" and "save" to a form using the same name
Form 2: Submits text
Form 3: Submits text
.. both solutions look exactly the same to me, the input type button is not handled as an "submit input field" here.. you submit using js.
There is no action on the button and that's why it's not included. (Like described above).
Form 4: Submits twice. 1) Submits text 2) Submits text and button
You're using a input type submit like in the Form 1.. so this form gets submitted exactly the same way. But: there is also a onsubmit handler on the form that calls the submit again using js- that's the reason for the second submit.
The handler is called first, because a submit will trigger a page-reload and the script executing the event will not be "present" anymove after the submit.
The other behaviour is just like described for Fomr 2 & 3
.
Just let me know if you need some further explainations.

go to next field automatically html5 form

I am using following html5 form.
<form>
<input type="text" name="orderno" />
<input name="picture" id="img" type="file" accept="image/*" capture="camera" />
<input class="btn-success" type="submit" name="submit" value="Upload" />
</form>
When I open this page in my mobile phone, I want that When I fill first input text, there should be a button called "NEXT" in my keyboard but currently it shows "GO" button directly. Any Help please?
javascript function document.getElementById('img').focus(); is not opening camera automatically.
I want the facility to launch camera on phone automatically when clicked "NEXT" or "GO" in keyboard.

For Security concerns, most browsers do not allow direct access to file uploader or image capture trigger. User has to click on the corresponding field to upload file or capture photograph. you can define focus after each has been addressed.

In first input have tabindex='1' in second input have tabindex='2' and so on.

Parsley: How to prevent validation when pressing buttons other than submit?

Thank you for any help.
I am trying to use Parsley for Form Validation. My form has one submit button and some other buttons to dynamically add inputs to the form. But when I press these other buttons, form validation is carried out. But I am not submitting any form.
How to prevent form validation from happening when I press other buttons than submit button?
Sorry, I dont know how to JS Fiddle. My code is like the following:
<form method="post" action="confirm" data-parsley-validate>
<input id="brand" data-parsley-trigger="submit" required />
<button id="addQuantity">Add</button>
<input type="number" required data-parsley-trigger="submit" />
<input type="submit" value="Submit">
</form>
When I press Add, the form is validated. How should I prevent this?
Thank you very much.

The tag button which was introduced in HTML5 is equivalent to input type="submit" hence when you press add it will automatically fire submit action. What you can do is replace the tag to input type="button" or you can prevent the default action in jquery like this
<script>
$('#addQuantity').click(function(event)
{
event.preventDefault();
//do your action goes below
});
</script>

I found adding formnovalidate to the button skipped form validation for the form only when clicking that button.

form is submit but values are not passing

When I submit form by using below function it is submitting but values are not passed through this function. I use all functions but nothing found:
document.getElementById("postad").submit();
Form is given below.
<form action="register.php" id="postad" method="post">
<input class="textfield2" type="text" id="post_title" style="width:640px;" placeholder="Ad Title" onBlur="check('post_title')" />
<input class="button" type="button" name="save" value="Publish" onclick="send();" />
</form>

Your form contains two form controls. Neither will be a successful control (i.e. one that appears in the submitted data), but for different reasons.
Only form controls with name attributes can be successful. Your text input doesn't have a name. (It also doesn't have a default value, so you need to type in it first).
Buttons can only be successful if they are the submit button used to submit the form. Your button isn't a submit button and you use JavaScript to submit the form.

There is no name attribute in your input text fields
<input name="post_title" class="textfield2" type="text" id="post_title" style="width:640px;" placeholder="Ad Title" onBlur="check('post_title')" />
.........^

Customizing the appearance of a file input in an HTML form

I've been trying to figure out how to customize the appearance of a file input in an HTML form so that the button will match with the rest of the buttons on my site. Looking around here I found a solution that I would expect to work, but it's having some strange behavior.
I took my file input and set display:none, and created a new text input and button within the form.
<form method="post" action="../Entry/Create" enctype="multipart/form-data" onsubmit="return aentryValidate()">
<input type="text" id="EntryTitle" name="EntryTitle" maxlength="50" />
<div id="invalidTitle" class="invalidData"></div>
<p id="char-remaining">(50 characters remaining)</p>
<input type="file" id="ImageFile" name="ImageFile" style="display:none;" />
<input type="text" id="ImageFileMask" name="ImageFileMask" disabled="true" />
<button type="button" onclick="HandleFileButtonClick()" id="ImageFileButton" style="margin-left:10px;padding-bottom:0px;height:20px;width:100px;font-size:14px;">browse...</button>
<div id="invalidImage" class="invalidData"></div>
<p id="file-desc">(image to represent your entry, jpg, png, or gif)</p>
<textarea id="EntryDesc" name="EntryDesc"></textarea>
<div id="invalidDesc" class="invalidData"></div>
<br />
<input type="checkbox" id="isPrivate" name="isPrivate" value="true" />
<input type="hidden" name="isPrivate" value="false" />
Make my entry private.
<button id="new-entry-save">save</button>
</form>
Then my javascript to handle the ImageFileButton button being clicked:
function HandleFileButtonClick() {
document.getElementById("ImageFile").click();
document.getElementById("ImageFileMask").value = document.getElementById("ImageFile").value;
}
It appears to work fine. I click the button, the window pops up for me to select a file. When I select a file, it appears in the text box.
The weird behavior comes when I hit the save button on the form. I noticed that it has to be clicked twice to actually submit for some reason now. And, when it submits it is no longer posting the file.
So I made the file input visible again to see what was happening. If I use the ImageFileButton button to select a file, the file shows up in the file input. But when save is clicked, the file input clears and the form doesn't submit. You then have to click again to submit, and of course now there is no file.
Anybody know what is happening here?

No, its not possible. File inputs are generally browser dependant. You might have to use JavaScript replacement or Flash replacement like uploadify.
Article: Input File
Of all form fields, the file upload field is by far the worst when it comes to styling. Explorer Windows offers some (but not many) style possibilities, Mozilla slightly less, and the other browsers none at all. The "Browse" button, especially, is completely inaccessible to CSS manipulation.