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iOS: How to programmatically trigger enter from a textfield in a webview

I am trying to add value to a text field in a web view using javascript. First, I add value using this code :
webView.evaluateJavaScript("document.getElementById('birds').value = 'username';", completionHandler:nil)
second I need to press Enter button to run next function. Here is text input's info:
<input type="text" name="submit" id="birds" placeholder="Write username or name and press enter" "="" class="ui-autocomplete-input" autocomplete="off">
How can I programmatically trigger enter button?

Just select the form and call submit
document.getElementById("myForm").submit();
This article could be worth a read though, you may need to select the submit button and call the onClick method instead, it depends how that particular form handles sending it's data.

Submit form with Javascript then handle with PHP

Not sure how I did this last time or else I wouldnt asking here but here is what I'm trying to do.
I have the usual basic form with a javascript function that will submit the form. Question is that after the form is submitted, I have an if statement in PHP that echos a that the form has been submitted. Any help would be greatly appreciated.
//PHP
if($_POST['submitDelete']){
echo "welcome, You form has been submitted";
}
//HTML
<form id="form_id" action="" method="POST">
First name: <input type="text" name="fname"><br>
Last name: <input type="text" name="lname"><br><br>
<input type="hidden" name="submitDelete" TYPE="submit">
</form>
<button type="button" onclick="myFunction()">Submit</button>
//JAVASCRIPT
<script>
function myFunction() {
document.getElementById("form_id").submit();
}
</script>
I can't seem to trigger the if statement in PHP. I also tried using the form name in the if statement and that didnt work either.

A form element must be told where to submit its data to when the submit event takes place. This is accomplished by setting the action attribute value for the form. Leaving that attribute empty does not implicitly set the form to post back to the current page. So, if you want to have a single page form/form processor, you need the action to be set to the current page file name:
<form action="currentPageFileName.php" method="post">
Next, there's no reason a single page can't have multiple forms on it. In that case you would need multiple submit buttons, each tied to a specific form. For this reason, you can't just drop a submit button anywhere on the page that you like unless you add the form attribute to the button to tie it back to the form it is supposed to trigger the submit for. Also, if you simply place the submit button within the form element it "belongs" to, you don't have to worry about this.
Also, you have some invalid HTML with:
<input type="hidden" name="submitDelete" TYPE="submit">
An element may not have the same attribute repeated within it (the case that you type the attribute in makes no difference since HTML is not case-sensitive). So, that code would wind up simply creating a submit button.
Lastly, if all you want to do with your submit button is cause its related form to be submitted, there is no need for JavaScript at all. That is what submit buttons do by default.
So, in the end, you can get rid of the JavaScript in your code completely and change your HTML to this:
<form id="form_id" action="currentFileName.php" method="POST">
First name: <input type="text" name="fname"><br>
Last name: <input type="text" name="lname"><br><br>
<input type="hidden" name="submitDelete" value="true">
</form>
<button type="submit" form="form_id">Submit</button>

Cant submit my button with form

I am trying to submit my button with a form. Im not trying to make my button submit the form. I want to be able to see my button value in the POST variable after the form submits. From my understanding all I need is to give my element a name and value. I should be able to see all the form variables once my form is submitted.
<input name='MC[]' type='text' size='51' placeholder='Enter In Question'>
<br/>
<input name='MC[]' type='button' value='Incorrect'>
<input name='MC[]' id='Options' size='40' placeholder='Enter In Option A'>
I'm new to this site not sure if I'm providing enough information but I simply want to submit this button inside a form and to be able to add the value of my button to a file. For some reason I cant see the button once the form is submitted. Are type button not sent to POST when submitted?
Note, I am able to see my other input elements. The type button one is the only one I cant see.

You can use Javascript that fills in the value of a hidden input from the value of the button that was clicked.
HTML:
<input type="hidden" name="answer" id="answer">
JS:
document.querySelectorAll("input[name='MC[]']").forEach(function(el) {
el.addEventListener("click", function() {
document.getElementById("answer").value = el.value;
}
}
Then you'll be able to get the button's value in $_POST['answer'].

That's not how buttons work... they perform an action, they don't get included in the post data. What you need is a checkbox, or a disabled input perhaps?

How to check which <button> was clicked?

I am using <button> instead of <input> because I need to contain an image in the buttons. This makes the form submit behavior different. How do I check which button the user clicked? There is no post data returned.
Example:
<button onclick="this.form.submit()" value="Done" name="Done"><img src='...'></button>
<button onclick="this.form.submit()" value="Save" name="DSave"><img src='...'></button>

Get rid of the onclick attributes. Let the button's natural submit feature submit the form instead of using JS. This will make the clicked button a successful control and it's name/value will appear in the submitted data.

Use a hidden input to carry the value, if POST isn't working

you can also use <submit> and that field name will be sent with the value Done or Save...

Use <input type="submit"> and just style them with css. In this way you can assign values to input.

Input field with onchange fails to trigger when user click button in another form

I have a page with multiple small forms on it. Each form has one input field that has an onchange function which will submit it's form to a url that returns a no data status.
Things work fine, submitting form after form, until the user clicks on a small form that has ONLY a submit button in it. This click works, but abandons the change in the previous field resulting in its onchange not firing the click at the bottom of the changed function fails (still trying to understand the firebug trace).
What's going on? is there a fix for my structure?
UPDATE:
First I tried simply delaying the action of the submit, but no luck.
I have hidden the and added an <input button> to the chain of "events" so that the focus has a place to come to rest before the real submit tries to happen -- the code below has been updated. So the question now becomes:
Is this as simple as it can be?
Script:
$(function() {
$('input,select').change(changed);
});
function changed(){
...
$(this).parents('form').find(':submit').click();
}
function doSubmit(elt, id)
{
$(elt).focus();
setTimeout(function(){
$(id).click();
}, 400);
}
One of may small forms:
<form class="clean" method="POST" action="QuoteProApp.php">
<input type="submit" value="field" name="btn_update" style="display: none;">
<input type="hidden" value="000242" name="quote_id">
<input type="text" maxlength="15" size="3" value="" name="q[cost][4][1][unit]">
</form>
The offending click goes into this form:
<form class="clean" method="POST" action="QuoteProApp.php">
<input type="hidden" value="000242" name="quote_id">
<input type='button' name='btn_close' value='Close' onclick='doSubmit(this,"#CLOSE");'>
<input id='CLOSE' type='submit' name='btn_close' value='Close' style='display:none;'>
</form>

Might be totally irrelevant, but your selector for the change event includes your submit input too. Can you change it to:
$('input[type="text"],select').change(changed);
to see if anything changes?

The solution turned out to be to create a button tag, set the focus explicitly to a it, and then set a timeout to click the real, but hidden, submit input tag. This allows the change in focus to run the submit associated with it and then continue with the explicit submit of the page.
The question has been updated to show this solution.