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selectbox the option I chose goes back to the top

When the page is redirected, the language I chose in the box does not
appear. At first, whatever is available is chosen.
here is what I want to do: change option data
<select id='lang' class='btn btn-xs btn-primary icons-select2'>
<?php
$query_lang=mysqli_query($con, "SELECT * FROM tb_lang");
while($lang = mysqli_fetch_assoc($query_lang)){
if ($lang['durum']==1)}
?>
<option value = "<?php echo $lang['lang_fix']; ?>" data-min="_<?php echo $lang['lang_fix']; ?>"
data-icon="<?php echo $lang['lang_flag']; ?>">
<?php
echo strtoupper($lang['lang_fix']);
?>
</option>
<?php }} ?>
</select>
<script>
$(document).ready(function () {
$('body').on('change','#lang', function() {
var lang_id= $(this).val();
window.location.replace("index.php?lang="+lang_id);
});
});
</script>

First retrieve the lang sent over GET by
$lang_id = $_GET['lang'];
then check it against the data you are looping through
<option value = "<?php echo $lang['lang_fix']; ?>" data-min="_<?php echo $lang['lang_fix']; ?>" data-icon="<?php echo $lang['lang_flag']; ?>" <?php if ($lang_id == $lang['lang_fix']) echo "selected"; ?>>
making your code look like below, so the option you want to be selected will have the necessary selected attribute.
$lang_id = $_GET['lang'];
<select id='lang' class='btn btn-xs btn-primary icons-select2'>
<?php
$query_lang=mysqli_query($con, "SELECT * FROM tb_lang");
while($lang = mysqli_fetch_assoc($query_lang)){
if ($lang['durum']==1)}
?>
<option value = "<?php echo $lang['lang_fix']; ?>" data-min="_<?php echo $lang['lang_fix']; ?>" data-icon="<?php echo $lang['lang_flag']; ?>" <?php if ($lang_id == $lang['lang_fix']) echo "selected"; ?>>
<?php
echo strtoupper($lang['lang_fix']);
?>
</option>
<?php }} ?>
</select>
<script>
$(document).ready(function () {
$('body').on('change','#lang', function() {
var lang_id= $(this).val();
window.location.replace("index.php?lang="+lang_id);
});
});
</script>

Button gets an incorrect PHP value by default via javascript

I have the following selector with options:
<select name="" id="product-selector" class="list_item">
<?php
if( have_rows('section_a') ):
while( have_rows('section_a') ): the_row();
if( have_rows('product_item') ):
while( have_rows('product_item') ): the_row();
$product_item_quantity = get_sub_field('product_item_quantity');
$product_item_price = get_sub_field('product_item_price');
$product_item_id = get_sub_field('product_item_id');
$product_item_variation_id = get_sub_field('product_item_variation_id');
?>
<option value="<?php echo $product_item_variation_id; ?>" data-id="<?php echo $product_item_variation_id; ?>" data-content="<?php echo $product_item_quantity; ?> <span class='price' data-count='<?php echo $product_item_quantity; ?>' data-price='<?php echo $product_item_price; ?>'><?php echo $product_item_price; ?>"> </option>
<?php endwhile; endif; endwhile; endif; ?>
</select>
And I have the following button:
<div class="submit">
<a class="btn btn-warning" id="purchase" href="?add-to-cart=<?php echo $product_item_id; ?>&variation_id=<?php echo $product_item_variation_id; ?>">Order Now</a>
</div>
My javascript is:
<script>
document.getElementById("product-selector").onchange = function() {
document.getElementById("purchase").href = "?add-to-cart="+"<?php echo $product_item_id; ?>"+"&"+"variation_id="+this.value+"/";
}
</script>
When user click by the Order button the link changes dynamically - it gets the value of and should get the <?php echo $product_item_variation_id; ?>" via the "variation_id="+this.value+" and it works fine, but when the page loads, the <?php echo $product_item_variation_id; ?> value of the button get the LAST option value, but not a first (default) one.
Much appreciate any help.

I think that you should make a variable to save the first value. Because you already loop. so default value is last value of the select.
<?php $product_item_variation_id_first = ""; ?>
<select name="" id="product-selector" class="list_item">
<?php
if( have_rows('section_a') ):
while( have_rows('section_a') ): the_row();
if( have_rows('product_item') ):
while( have_rows('product_item') ): the_row();
$product_item_quantity = get_sub_field('product_item_quantity');
$product_item_price = get_sub_field('product_item_price');
$product_item_id = get_sub_field('product_item_id');
$product_item_variation_id = get_sub_field('product_item_variation_id');
if ($product_item_variation_id_first == "")
$product_item_variation_id_first = $product_item_variation_id;
?>
<option value="<?php echo $product_item_variation_id; ?>" data-id="<?php echo $product_item_variation_id; ?>" data-content="<?php echo $product_item_quantity; ?> <span class='price' data-count='<?php echo $product_item_quantity; ?>' data-price='<?php echo $product_item_price; ?>'><?php echo $product_item_price; ?>"> </option>
<?php endwhile; endif; endwhile; endif; ?>
</select>
<div class="submit">
<a class="btn btn-warning" id="purchase" href="?add-to-cart=<?php echo $product_item_id; ?>&variation_id=<?php echo $product_item_variation_id_first; ?>">Order Now</a>
</div>

codeigniter 3rd combo box does not display data

This is my Model
function getMatkul($dosen) {
$data = array();
$query = $this->db->get_where('input_jadwal', array('dosen' => $dosen));
if ($query->num_rows() > 0) {
foreach ($query->result_array() as $row){
$data[] = $row;
}
}
$query->free_result();
return $data;
}
function getKelas($matkul) {
$data = array();
$query = $this->db->get_where('input_jadwal', array('kode_matkul'=>$matkul));
if ($query->num_rows() > 0) {
foreach ($query->result_array() as $row){
$data[] = $row;
}
}
$query->free_result();
return $data;
}
This is my View
<select name="dosen" id="dosen" class="form-control" required="">
<option disabled="" selected="">Dosen</option>
<?php foreach($dosen as $d){ ?>
<option value="<?php echo $d['dosen']; ?>"><?php echo $d['dosen']; ?></option>
<?php } ?>
</select>
</div>
<div class="col-md-12 form-group">
<select name="matkul" id="matkul" class="form-control" required="">
<option disabled="" selected="">Mata Kuliah</option>
<?php foreach($matkul as $m) {?>
<option value="<?php echo $m['kode_matkul']; ?>"><?php echo $m['matkul']; ?></option>
<?php } ?>
</select>
</div>
<div class="col-md-12 form-group">
<select name="kelas" id="kelas" class="form-control" required="">
<option disabled="" selected="">Kelas</option>
<?php foreach($kelas as $k) {?>
<option value="<?php echo $k['kelas']; ?>"><?php echo $k['kelas']; ?></option>
<?php } ?>
</select>
</div>
<div class="col-md-12 form-group">
<button name="mysubmit" class="btn btn-primary pull-left btn-flat" type="submit">Show Record</button>
</div>
</div>
</div>
</form>
</div>
</section>
<script type="text/javascript">
<?php
$this->load->model('combobox_model');
foreach($dosen as $dm) { ?>
var <?php echo str_replace(' ','',$dm['dosen'].$dm['dosen']); ?> = [
<?php $resultM = $this->combobox_model->getMatkul($dm['dosen']); ?>
<?php foreach ($resultM as $rm) { ?>
{display: "<?php echo $rm['matkul']; ?>", value: "<?php echo $rm['kode_matkul']; ?>" },
<?php } ?>];
<?php } ?>
$("#dosen").change(function() {
var parent = $(this).val();
switch(parent){
<?php foreach($dosen as $dd){ ?>
case '<?php echo $dd['dosen']; ?>':
lista(<?php echo str_replace(' ','',$dd['dosen'].$dd['dosen']); ?>);
break;
<?php } ?>
default: //default child option is blank
$("#matkul").html('');
break;
}
});
function lista(array_list)
{
$("#matkul").html(""); //reset child options
$(array_list).each(function (i) { //populate child options
$("#matkul").append("<option value=\""+array_list[i].value+"\">"+array_list[i].display+"</option>");
});
}
</script>
<script type="text/javascript">
<?php
$this->load->model('combobox_model');
foreach($matkul as $mk) { ?>
var <?php echo str_replace(' ','',$mk['matkul'].$mk['kode_matkul']); ?> = [
<?php $resultK = $this->combobox_model->getKelas($mk['kode_matkul']); ?>
<?php foreach ($resultK as $rk) { ?>
{display: "<?php echo $rk['kelas']; ?>", value: "<?php echo $rk['kelas']; ?>" },
<?php } ?>];
<?php } ?>
$("#matkul").change(function() {
var parent = $(this).val();
switch(parent){
<?php foreach($matkul as $tt){ ?>
case '<?php echo $tt['kode_matkul']; ?>':
listb(<?php echo str_replace(' ','',$tt['matkul'].$tt['kode_matkul']); ?>);
break;
<?php } ?>
default: //default child option is blank
$("#kelas").html('');
break;
}
});
function listb(array_list)
{
$("#kelas").html(""); //reset child options
$(array_list).each(function (i) { //populate child options
$("#kelas").append("<option value=\""+array_list[i].value+"\">"+array_list[i].display+"</option>");
});
}
</script>
Combobox 1 linked to combobox 2, combobox 2 linked to combobox 3. when When I run it, only combo box 1 and 2 which have the data. I think the problem is on javascript. Need help, thank you. This is the pic of my combobox

JQuery checkbox when value is assigned

I've been trying to get JQuery to check a radio for me when I assign a value 'Z' to it.
My current code:
<?php if ($option['type'] == 'radio') { ?>
<div class="form-group<?php echo ($option['required'] ? ' required' : ''); ?>">
<label class="control-label"><?php echo $option['name']; ?></label>
<div id="input-option<?php echo $option['product_option_id']; ?>">
<?php if (isset($option_values)) foreach ($option_values as $option_value) { ?>
<div class="radio">
<label>
<input type="radio" name="option[<?php echo $option['product_option_id']; ?>]" value="<?php echo $option_value['product_option_value_id']; ?>" />
<?php echo $option_value['name']; ?>
<?php if ($option_value['price']) { ?>
<?php if ($option_value['price_prefix'] == 'z') {?>
<script>
$(".radio").prop("checked", true)
</script>
<?php echo 'Im Active!!'; ?><?php }
else { ?> <?php echo ' ';?> (<?php echo $option_value['price_prefix'];?>
<?php echo $option_value['price']; ?>) <?PHP }?>
<?php } ?>
</label>
</div>
<?php } ?>
</div>
</div>
<?php } ?>
<?php } ?>
As for now, my option 'Z' only shows 'I'm Active!!' in the list. The radio is still unchecked though.
What am I doing wrong?
I'm planning on releasing a free OpenCart module where people can activate an option by standard by assigning the value Z in product properties.
Thanks!

Use PHP variables in Jquery [closed]

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Hi i have read this thread about using php variable in jquery but somehow it doesnt work on my site:
LINK
Javascript:
<script>
var row_id="<?php echo $r['id']; ?>";
$(document).ready(function(){
$("#que"+row_id).click(function(){
$("#ans"+row_id).slideToggle();
});
});
</script>
<?php foreach($res as $r) : ?>
<li id="que<?php echo $r['id']; ?>">Q<?php echo $r['id']; ?>: <?php echo $r['question']; ?> </li>
<div id="ans<?php echo $r['id']; ?>" style="padding:5px;">A: <?php echo $r['answer']; ?></div>
<?php endforeach; ?>

Just use classes. Otherwise you will end up having a jquery piece of code for each question.
<script>
$(document).ready(function(){
$(".que").click(function(){
$(this).next().slideToggle();
});
});
</script>
<?php foreach($res as $r) : ?>
<li class="que">Q<?php echo $r['id']; ?>: <?php echo $r['question']; ?></li>
<div style="padding:5px;">A: <?php echo $r['answer']; ?></div>
<?php endforeach; ?>
FIDDLE

Script tag should be inside the forach loop.
Please try this and explain exact what error you got?

you wouldn't get this value var row_id="<?php echo $r['id']; ?>"; because $r['id'] is in the foreach.
I assume that you want to take the $r['id'], so try something like this
<script>
$(document).ready(function(){
$(".row").click(function(){
var row_id = $(this).val();
$("#ans"+row_id).slideToggle();
});
});
</script>
<?php foreach($res as $r) : ?>
<li id="que<?php echo $r['id']; ?>">Q<?php echo $r['id']; ?>: <?php echo $r['question']; ?></li>
<input type="hidden" value="<?php echo $r['id']; ?>" class="row" />
<div id="ans<?php echo $r['id']; ?>" style="padding:5px;">A: <?php echo $r['answer']; ?></div>
<?php endforeach; ?>

Use classes and .next() to solve this easily:
<script>
$(document).ready(function(){
$('.que').click(function(){
$(this).next('.ans').slideToggle();
});
});
</script>
<?php foreach($res as $r) : ?>
<li id="que<?php echo $r['id']; ?>" class="que">Q<?php echo $r['id']; ?>: <?php echo $r['question']; ?> </li>
<div id="ans<?php echo $r['id']; ?>" class="ans" style="padding:5px;">A: <?php echo $r['answer']; ?></div>
<?php endforeach; ?>

I think you have used the undefined variable $r in javascript.
Which is only defined in the foreach loop. get the javascript into the loop it will work.
<script>
function q_click(row_id){
$("#ans"+row_id).slideToggle();
}
</script>
<?php foreach($res as $r) : ?>
<li id="que<?php echo $r['id']; ?>">Q<?php echo $r['id']; ?>: <?php echo $r['question']; ? onclick="q_click(<?php echo $r['id']; ?>)"> </li>
<div id="ans<?php echo $r['id']; ?>" style="padding:5px;">A: <?php echo $r['answer']; ?></div>
<?php endforeach; ?>