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How to use PHP loop variable in javascript?

I have run an SQL statement to get all the records I need to show in a HTML table.
I have then run a while loop to display the records from the database. (The code for this is below.)
<table class="projects-table">
<tr>
<th>Complete?</th>
<th>Paid?</th>
<th>Project Name</th>
<th>£ / hr</th>
<th>End Date</th>
<th>Hours Logged</th>
<th><i class="fa fa-trash"></i></th>
</tr>
<?php
$select_id_jobs = mysqli_query($mysqli, "SELECT id FROM users WHERE username='$login_user'");
while($row = mysqli_fetch_array($select_id_jobs)) {
$id_jobs = $row['id'];
}
$select_jobs_with_usrid = mysqli_query($mysqli, "SELECT * FROM jobs WHERE username_id = '$id_jobs';");
while($row = mysqli_fetch_array($select_jobs_with_usrid)) {
?>
<tr id="<?php echo $rowId; ?>">
<td>
<!-- Complete Checkbox -->
<input type="checkbox" id="<?php echo $completeCheck;?>" onclick="compTask();">
</td>
<td>
<!-- Paid checkbox -->
<input type="checkbox" onclick="paidTask()">
</td>
<td>
<?php echo $row['project_title']; ?>
</td>
<td>
<?php echo $row['cost_hour']; ?>
</td>
<td>
<?php echo $row['completion_date']; ?>
</td>
<td>
<?php echo $row['time_spent']; ?>
</td>
<td>
<div class="delete-btn"><a onclick="deleteTask()">DELETE</a></div>
</td>
</tr>
<?php } ?>
</table>
As you can see from the checkbox for completing a task. What I want to do is use javascript so that when the checkbox is checked the text from the other records turns green.
I have included the javascript I am trying to use below. I don't know why but I can't access the inputs ID in order to change the css.
<script>
function compTask() {
if (document.getElementById("<?php echo 'complete-' . $row['id'] ?>").checked == true) {
document.getElementById("<?php echo 'tr' . $row['id']; ?>").style.color = "green";
alert("hello");
} else {
document.getElementById("<?php echo 'tr' . $row['id']; ?>").style.color = "black";
}
}

Okay easy way to do that is to print id as parameter in js function
something like that:
<input type="checkbox" id="<?php echo $completeCheck;?>"
onclick="compTask( '<?php echo $row['id'];?>' );">
and in js function deal with id from parameter:
function compTask(id) {
if (document.getElementById('complete-' + id).checked == true) {
document.getElementById('tr' + id).style.color = "green";
alert("hello");
}
}

Hy,
You need to add id in onclick="deleteTask('<?php echo $row['id']; ?>')">
Now in you function have id:
function deleteTask(id) { console.log(id) }

How to add a new element to a specific cell inside a table?

<?php session_start() ;
include 'databaseConnection.php' ;
$sqlCommand3 = "SELECT * FROM posts ;" ;
$result3 = mysqli_query($conn , $sqlCommand3);
$resultCheck = mysqli_num_rows($result3);
while ($row = mysqli_fetch_array($result3)) { ?>
<tr>
<td style="padding-left: 10px;">
<?php echo $row['poster']; ?>
</td>
<td style="padding-left: 45px;">
<?php echo $row['post_destination']; ?>
</td>
<td style="padding-left: 30px;">
<?php echo $row['post_readyTime']; ?>
</td>
<td style="padding-left: 45px;">
<?php echo $row['post_numberOfPassenger'];?>
</td>
<td style="padding-left: 32px;">
<?php echo $row['post_submitTime']; ?>
</td>
<td>
<form action="riderJoin.php" method="post">
<input type ="hidden" name ="id" value="<?php echo $row['post_id']; ?>" >
<input type =submit class="edit_btn" name = submit value = "Join">
</form>
</td>
<!--<td>
Delete
</td>-->
</tr>
<?php } ?>
</table>
</div>
</div>
<script type="text/javascript">
$("td:nth-child(4):contains('5')").addClass('redWord');
var x = document.getElementsByClassName('edit_btn');
<?php if (isset($_POST['submit'])) { ?>
var i = <?php echo $_SESSION['postId'] ; ?> - 1 ;
$(x[i]).val('Delete').css('background-color','red').css('color','white');
<?php }?>
</script>
How to add a new input (type = "submit" value="delete") with a new action (before the "join" button) whenever the $_POST['submit'] is set? I don't want to add a new input before each "join" button. Instead, I just want to add after a specific "join" button inside a cell when that specific "join" button is clicked. Also, if I click another 'join' button in other cell, a similar effect would happen too. So in the end, after clicking two "join" button, there should be only two delete button each added before the specific clicked "join" buttons. How to solve it ?
Thanks a lot :)

how to use hide show in while loop with different ids

HTML
while($row=mysql_fetch_array($result_pag_data)) {
$ad++;
$sql1=mysql_query("select *from company where com_id='$row[com_id]'");
$row1=mysql_fetch_array($sql1);
?>
<tr>
<input type="hidden" id="comid" name="comid" value="<?php echo $row1[com_id];?>"/>
<tr>
<td><img src="images/mobile.png" width="18" height="18" border="0" alt="Mobile"></td>
<td class="comm-details"><strong>Mobile</strong></td>
<td align="center">:</td>
<td class="comm-details"><?php if($row1['mobile1']!='') { ?> <a id="showmobile<?php echo $row1[com_id];?>">View Mobile Number</a> <span id="shwmb<?php echo $row1[com_id];?>" style="display:none"><?php echo $row1['mobile1'];}else{ echo 'Not Available';}?></td>
</tr>
}
Javascript
<script>
$(function () {
var comid = $('#comid').val();
$("#showmobile" + comid).click(function() {
$("#shwmb" + comid).show();
$("#shwmb" + comid).hide();
});
});
</script>
Now I want to show the mobile number when the customer clicks on View Mobile Number. It currently only works on the first viewed company, not for subsequent companies.
When I change the event handling to listen to the class instead of the id, clicking on any one company's View Mobile Number will display the mobile numbers of all companies on the page.
Neither solution is working properly. What am I doing wrong, and how do I make this work?

Change your code as like below:
<?php
$ad = 0;
while ($row = mysql_fetch_array($result_pag_data)) {
$ad++;
$sql1 = mysql_query("select *from company where com_id='$row[com_id]'");
$row1 = mysql_fetch_array($sql1);
?>
<tr>
<input type="hidden" id="comid" name="comid" value="<?php echo $row1[com_id]; ?>"/>
<tr>
<td><img src="images/mobile.png" width="18" height="18" border="0" alt="Mobile"></td>
<td class="comm-details"><strong>Mobile</strong></td>
<td align="center">:</td>
<td class="comm-details">
<?php if ($row1['mobile1'] != '') { ?>
<a id="showmobile<?php echo $row1[com_id]; ?>" onclick="return showmobile(<?php echo $row1[com_id]; ?>)">View Mobile Number</a>
<span id="shwmb<?php echo $row1[com_id]; ?>" style="display:none">
<?php echo $row1['mobile1']; ?>
</span>
<?php
} else {
echo 'Not Available';
}
?>
</td>
</tr>
<?php }
?>
<script>
function showmobile(id) {
if($("#shwmb" + id).css('display') == 'none') {
$("#shwmb" + id).show();
}else {
$("#shwmb" + id).hide();
}
}
</script>

You have to put unique value in the ID or CLASS of the line.
<input type="hidden" id="comid<?php echo $row['ID']?>" name="comid" value="<?php echo $row1[com_id];?>"/>
and after that in the javascript code you just specify the id along with the id_name and id_value.

This might work for your purpose:
while($row=mysql_fetch_array($result_page_data)) {
$ad++;
$sql1=mysql_query("select *from company where com_id='$row[com_id]'");
$row1=mysql_fetch_array($sql1);
?>
<tr>
<td>
<input type="hidden" id="input-<?php echo $row1[com_id];?>" name="input-<?php echo $row1[com_id];?>" value="<?php echo $row1[com_id];?>"/>
<img src="images/mobile.png" width="18" height="18" border="0" alt="Mobile">
</td>
<td class="comm-details"><strong>Mobile</strong></td>
<td align="center">:</td>
<td class="comm-details"><?php if($row1['mobile1']!='') { ?> <a id="showmobile<?php echo $row1[com_id];?>" class="showmobile">View Mobile Number</a> <span id="shwmb<?php echo $row1[com_id];?>" style="display:none"><?php echo $row1['mobile1'];}else{ echo 'Not Available';}?></td>
</tr>
}
<script>
$(function () {
$(".showmobile").click(function() {
var comid = $(this).attr("id").replace("showmobile","");
$("#shwmb" + comid).toggle();
});
});
</script>
The first change is to use $row1[com_id] in the id and name attributes for the hidden input field. This will allow the hidden fields to be separate from one another, as id has to be unique on a page; name should also be unique.
Next, a class was added to the showmobile link, so that we can install a single class-level click handler. The click handler will extract the com_id from the showmobile element and use it to change the visibility of the shwmb element, using jQuery toggle.
Some light restructuring has been done and some significant reformatting. The hidden input field was added to the first td element, so that it doesn't interfere with the structure of the table.
Also, the $result_page_data variable name was corrected.

Execute PHP inside SCRIPT TAG

I have a listbox that displays a couple of internships under following format
id - name :
1 - Computer Science
So far, I have create the function addRow in order to update my fields from form.
If I do
alert($montext)
I can display "1 - Computer Science", but I am looking only for the value "1".
I tried :
alert(<?php substr($montext,0,2)?>);
But seems that php inside "script" isn't being executed.
Because following code changes the value in the field:
document.getElementById('ti').value=$montext;
Because I'd like also to execute php code inside the script TAG.
I'm running under Apache.
If you could help me out. Thanks
Find hereby the used code.
<html>
<head>
<script>
function addRow(title,text,description,id) {
$montext=$( "#idStage option:selected" ).text();
alert($montext);
document.getElementById('ti').value=$montext;
/*document.getElementById('te').value=text;
document.getElementById('de').value=description;
document.getElementById('id').value=id;*/
}
function setText(title,text,description,id){
document.getElementById('title').value=title;
document.getElementById('text').value=text;
document.getElementById('description').value=description;
document.getElementById('id').value=id;
}
</script>
</head>
<body>
<?php
include('../admin/connect_db.php');
?>
<table cellpadding="0" cellspacing="0">
<tr>
<td>
<label class="notBold">Choose the internship you want to update: </label>
<select name="idStage" id="idStage" onChange="addRow()">
<?php
$stmt = $db->stmt_init();
if($stmt->prepare('SELECT id, title,text,description FROM offre ORDER by published_date ASC')) {
$stmt->bind_result($id,$title,$text,$description);
$stmt->execute();
while($stmt->fetch()){
?>
<option id="nostage" value="<?php echo$id;?>" onclick="setText('<?php echo $title ?>',' <?php echo $text ?> ',' <?php echo $description ?>',' <?php echo $id?>');"><?php echo $id." - ".$title;?></option>
<?php
}
$stmt->close();
}
?>
</select>
</td>
<td width="20">
<img src="./Image/exit.png" title="Close" id="closeDelete" class="closeOpt" onclick="closeOpt()" />
</td>
</tr>
</table>
<form method="post" action="modifystage.php">
<table>
<tr>
<td>
<input type = "hidden" id ="id" name="id"/>
</td>
</tr>
<tr>
<td class="label">
<label>Title </label>
<textarea id = "ti" name="ti" rows = "3" cols = "75">
<?php
$stmt = $db->stmt_init();
if($stmt->prepare('SELECT id, title,text,description FROM offre ORDER by published_date ASC')) {
$stmt->bind_result($id,$title,$text,$description);
$stmt->execute();
}
echo $title;
?>
</textarea>
</td>
</tr>
<tr>
<td class="label">
<label>Desc</label>
<textarea id = "de" name="de" rows = "3" cols = "75">
<?php
$stmt = $db->stmt_init();
if($stmt->prepare('SELECT id, title,text,description FROM offre ORDER by published_date ASC')) {
$stmt->bind_result($id,$title,$text,$description);
$stmt->execute();
}
echo $description;
?>
</textarea>
</td>
</tr>
<tr>
<td class="label">
<label>Text </label>
<textarea id = "te" name="te" rows = "3" cols = "75">
<?php
$stmt = $db->stmt_init();
if($stmt->prepare('SELECT id, title,text,description FROM offre ORDER by published_date ASC')) {
$stmt->bind_result($id,$title,$text,$description);
$stmt->execute();
}
echo $text;
?>
</textarea>
</td>
</tr>
<tr>
<td colspan="2" align="right"colspan="2" class="label">
<button type="submit">Submit</button>
</td>
</tr>
</table>
</form>
</body>
</html>

You don't need to use PHP here. Use the javascript substring function - http://www.w3schools.com/jsref/jsref_substring.asp
For example
alert(montext.substring(0, 2));

Write your <script> on bellow your PHP and try this :
<script>
function addRow(title,text,description,id) {
var montext = $( "#idStage" ).text();
alert(montext);
document.getElementById('ti').value(montext);
/*document.getElementById('te').value=text;
document.getElementById('de').value=description;
document.getElementById('id').value=id;*/
}
function setText(title,text,description,id){
document.getElementById('title').value=title;
document.getElementById('text').value=text;
document.getElementById('description').value=description;
document.getElementById('id').value=id;
}
</script>
If you want to call variable from PHP, don't forget to use echo like this :
alert("<?php echo substr($montext,0,2); ?>");

show/hide with dynamic id out of a sql database

Submenu Part
<div id="subnavigation">
<?php
$verbindung = mysql_connect("host", "user" , "pw")
or die("Verbindung zur Datenbank konnte nicht hergestellt werden");
mysql_select_db("db") or die ("Datenbank konnte nicht ausgewählt werden");
$sub_instr = mysql_query("SELECT * FROM instrument ORDER BY InstrName");
while($sub = mysql_fetch_assoc($sub_instr))
{?>
<div class="sub-item">
<p>
<button type="button" id="<? echo $sub["InstrID"] ?>" class="submenu-button"><? echo $sub["InstrName"] ?></button>
</p>
</div><?
}?>
</div>
Table Part
<div class="content-item">
<!-- Content-Item 1 !-->
<? $db_instr="SELECT * FROM instrument ORDER BY InstrName" ; $show_instr=m ysql_query($db_instr); while($row=m ysql_fetch_assoc($show_instr)) {?>
<table id="<? echo $row[" InstrID "] ?>" border="1" class="hidden">
<tr>
<th rowspan="6">
<img border="0" src="<? echo " ../SiteAdministration/ControlCenter/Instr/ ".$row["InstrImage "] ?>" alt="<? echo $row[" InstrName "] ?>" width="400" height="400">
</th>
<th colspan="2">Informationen</th>
</tr>
<tr>
<td>Name:</td>
<td>
<? echo $row[ "InstrName"] ?>
</td>
</tr>
<tr>
<td>Klanglage:</td>
<td>
<? echo $row[ "InstrKlang"] ?>
</td>
</tr>
<tr>
<td>Bauschwierigkeit:</td>
<td>
<? echo $row[ "InstrBau"] ?>
</td>
</tr>
<tr>
<td>Materialkosten:</td>
<td>
<? echo $row[ "InstrPreis"] ?>
</td>
</tr>
<tr>
<td>Infotext:</td>
<td>
<? echo $row[ "Infotext"] ?>
</td>
</tr>
</table>
<? }?>
</div>
jQuery
$(document).ready(function ()
{
$('.sub-item p button').click(function ()
{
var buttonID = $(this).attr('id');
alert('table#' + buttonID);
$('table.hidden').hide();
$('table#' + buttonID).show();
});
});
The first code example describes how I generated a list of buttons, with the ID from the sql database. So every button has it's unique ID coming from the fitting database entry.
The second code example describes a table generated from database entries, every table gets a unique ID coming from the fitting database entry.
The third code example should get the ID of the button I click, get the table with the same ID as the button, hide all tables and only show the table with the same ID as the button.
The problem is, that it won't show anyting. It just hides all tables...
Just to let you know, I'm completly new to javascript/jQuery.

ID of an element must be unique(Now you have a table and button with the same id) so use a data-* attribute in the button to store the target element id.
<button type="button" data-target="<? echo $sub["InstrID"] ?>" class="submenu-button"><? echo $sub["InstrName"] ?></button>
then in the click handler
var buttonID = $(this).data('target');