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HTML get value of select popoulated by PHP array

I have a view that that I have written in HTML and PHP that is like the following:
<select name="category" id="_category" class="_cateogry" onchange="submitTheForm() >
option value="">Please select</option>
<?php foreach ($categories as $contents ) {?>
<option value="<?php echo $contents->id;?>" selected="selected"><?php echo $contents->name;?></option>
<?php }?>
</select>
Now, I want to get <?php echo $contents->name;?> when the onChange function is called.
I tried to resolve it unsuccessfully in JS, and here is the JS code that I attempted:
function submitTheForm () {
var selectElement = document.getElementById('_category');
var selected = selectedElem.options[selectedElem.selectedIndex];
console.log(selected.text);
}
I want to console.log the selected <?php echo $contents->name;?> when the onchange function is called.

There is a missing " after the javascript function and your code could be modified a little like this - to use event rather than rely upon names or ids
<select name="category" id="_category" class="_cateogry" onchange="submitTheForm(event)" >
<option value="">Please select</option>
<?php foreach ($categories as $contents ) {?>
<option value="<?php echo $contents->id;?>" selected="selected"><?php echo $contents->name;?></option>
<?php }?>
</select>
function submitTheForm( event ) {
var value=event.target.value;
var text=event.target.options[event.target.options.selectedIndex].text;
console.log('%s -> %s',value,text);
}

<select name="category" id="_category" class="_cateogry" onChange="submitTheForm(this);" >
<option value="">Please select</option>
<option value="1">First</option>
<option value="2">Second</option>
</select>
<script>
function submitTheForm(sel)
{
console.log(sel.options[sel.selectedIndex].text);
}
</script>
You can do as per below
// select box code whch one you have alredy
<select name="category" id="_category" class="_cateogry" onChange="submitTheForm(this);" >
<option value="">Please select</option>
<?php foreach ($categories as $contents ) {?>
<option value="<?php echo $contents->id;?>" selected="selected"><?php echo $contents->name;?></option>
<?php }?>
</select>
//Javascript code to get selected options text value
<script>
function submitTheForm(sel)
{
console.log(sel.options[sel.selectedIndex].text);
}
</script>

Use the function addEventListener to bind the event change.
This is an alternative.
You can get the value and text using the context this.
document.getElementById('_category').addEventListener('change', function() {
console.log(this.value);
console.log(this.options[this.selectedIndex].text);
});
<select name="category" id="_category" class="_cateogry">
<option value="">Please select</option>
<option value="1595">Ele</option>
</select>

You can use jquery easily rather than javascript:
function submitTheForm () {
var optionName = jQuery('#_category option:selected').text();
alert(optionName);
}

Get Javascript Variable value in PHP variable

var val;
$('select').on('change', function() {
alert( this.value );
val = this.value;
})
<?php
echo $variable = "<script>document.write(val)</script>";
?>
<select>
<option value="1">One</option>
<option value="2">Two</option>
<option value="3">Three</option>
<option value="4">four</option>
</select>
I want to get the value of the selected box and save it in a PHP variable. I want to save and echo val variable. Please help

use this code for use variable
<?php
session_start();
echo $_SESSION['php_value'];
?>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script>
function getValue(obj){
var value = obj.value;
$.ajax({
type:"POST",
url: 'edit.php',
data: "val="+ value,
dataType: 'text',
async: false,
cache: false,
success: function ( result ) {
window.location.reload();
}
});
}
</script>
<select onchange="getValue(this)">
<option value="1" <?php if($_SESSION['php_value'] == 1) echo 'selected';?>>One</option>
<option value="2" <?php if($_SESSION['php_value'] == 2) echo 'selected';?>>Two</option>
<option value="3" <?php if($_SESSION['php_value'] == 3) echo 'selected';?>>Three</option>
<option value="4" <?php if($_SESSION['php_value'] == 4) echo 'selected';?>>four</option>
</select>
then create edit.php file
<?php
session_start();
$_SESSION['php_value'] = $_REQUEST['val'];
?>

Ajax can do this. Google it, and check out api.jquery.com and look at the ajax functions, .ajax(), .post(), .get(), .load(), etc.
As for your specific question, here is what you would do:
//Javascript file
$.post('my_ajax_receiver.php', 'val=' + $(this).val(), function(response) {
alert(response);
});
});
//PHP file my_ajax_receiver.php
<?php
$value = $_POST['val'];
echo "$value";
?>

Editable select box do not get refresh on ajax call in Codeigniter

I am using editable select to show drop down list.Depend on search if values is not present in table which initially generates dropdown then I check if values are present in other table and if yes then I want to reload drop down with new values.
Select in view is
<select tabindex="2" id="port_of_loading" name="port_of_loading" onkeyup="port_search()">
<option value=""></option>
<?php if(!empty($port_list))
{
foreach($port_list as $d)
{
?>
<option value="<?php echo $d->port_id; ?>"><?php echo $d->port_name; ?></option>
<?php } } ?>
</select>
and ajax is
var search_val = $("#port_of_loading").val();
$.ajax({
type:'POST',
cache:false,
async:false,
data: { 'search_val' : search_val },
url: 'URL',
success: function(data)
{
$("#port_of_loading").html(data);
}
});
I am refreshing it from controller.
consloe.log(data) output is
<select tabindex="2" id="port_of_loading" name="port_of_loading" onkeyup="port_search()">
<option value=""></option>
<option value="26">value1</option>
<option value="9">value2</option>
</select>

Select problems in IE9 - in other browsers it works perfectly

I have problems with this particular form, i need first to select a value and then to submit the form. Submit form works good, however the default selection value in all browsers is selected and it is Acceptable, except in IE where no default selection value is selected. In IE there is nothing selected by default.
How do I fix this?
Picture of the problem :
:
<select name="formQuality" id="formQuality" value="acceptable">
<option value="acceptable">Acceptable</option>
<option value="good">Good</option>
<option value="better">Better</option>
<option value="excellent">Excellent</option>
<option value="best">Best</option>
</select>
<?php
if(isset($_POST['SubmitButton'])){ //check if form was submitted
$input = $_POST['inputText']; //get input text
$varQuality = $_POST['formQuality'];
$message = "Success! You entered: ".$input;
}
?>
<br>
<form action="" method="post">
<h1>Choose Quality:</h1>
<?php
$thequa = htmlspecialchars($_POST['formQuality']);
?>
<select name="formQuality" id="formQuality" value="<?php echo $thequa;?>">
<option <?php if ($thequa1 == 'acceptable') { ?>selected="true" <?php }; ?> value="acceptable">Acceptable</option>
<option selected="true" value="acceptable">Acceptable</option>
<option <?php if ($_POST['formQuality'] == 'good') { ?>selected="true" <?php }; ?> value="good">Good</option>
<option <?php if ($_POST['formQuality'] == 'better') { ?>selected="true" <?php }; ?> value="better">Better</option>
<option <?php if ($_POST['formQuality'] == 'excelent') { ?>selected="true" <?php }; ?> value="excellent">Excellent</option>
<option <?php if ($_POST['formQuality'] == 'best') { ?>selected="true" <?php }; ?> value="best">Best</option>
</select>
<textarea name="inputText" cols="100" rows="20" style="border:solid 1px orange;"><?php echo $thetext;?></textarea>
<p>
<input type="submit" value="Rewrite" name="SubmitButton"/>
</form>

The intended way to preselect an option is setting the selected attribute on the option element, rather than adding a value attribute to the select field.
<select name="formQuality" id="formQuality">
<option value="acceptable" selected>Acceptable</option>
<option value="good">Good</option>
<option value="better">Better</option>
<option value="excellent">Excellent</option>
<option value="best">Best</option>
</select>
This produces the expected result in all browsers, including IE.

Use selected="selected"
Like,
<option value="My Default" selected="selected">
to make an option as default selected value. This works in all browsers.

Passing selected value in SELECT tag using serializeArray

How do i pass the selected value in a SELECT tag with serializeArray?I tried the followng code but when i click post it empties the select tag option.
html
<form action="" name="frm" id="frm" method="post">
<input type="text" name="title_val" value="abc" id="title_val"/>
<select name="test" id="test">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
</select>
post
</form>
JS
$( document ).ready(function() {
$('#save').click(function() {
var form = $('#frm');
$.ajax({
url: 'topic.php',
type:'post',
data: form.serializeArray(),
success: function(response) {
$('#test').html(response);
}
});
});
});
php
<?php
echo $_POST['test'];
?>

following code works for me,
data: form.serialize();