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How to disable input type text, if value=true

I want to disable input type when the value of the input is true
("SELECT * FROM userinfo WHERE id='studid'")
<input type='text' name='id' value='<?php echo $row['studid']; ?>' />
How can I do that ? Help me :(

Try like this.
if(isset($row['studid']))
{
$dis='disabled';
}
else
{
$dis='';
}
<input type='text' name='id' value='<?php echo $row['studid']; ?>' <?=$dis?> />

Echo it out as php, but I'm not exactly sure what you mean by if stuid is true..? If it isn't true it doesn't exist and if it doesn't exist it shouldn't be the value of your input ....
if($row['studid'] == ""){
echo "<input type='text' name='id' value='' disabled/>";
}else{
echo "<input type='text' name='id' value='' />";
}

How to calculate from each row data textbox value in array?

I want to show total sum of values for each row data array. I have 5 rows of data, I want to get the results of each of data. Can anyone help me to figure it out?
function subtotal(konversi){
var hitung = (document.getElementById('quantity').value * document.getElementById('packing_value').value);
document.forms.demoform.quantity_konversi.value = hitung;
}
<form id='demoform'>
<?php
$jumlah=5;
for($i=0; $i<$jumlah; $i++){
$nomor = $i + 1;
echo"$nomor";
?>
<input type='text' name='quantity[]' id='quantity' onchange="subtotal(this.value,getElementById('packing_value').value);">
X
<input type='text' id="packing_value" value='10' readonly='yes'>
<input type='text' name='quantity_konversi[]' id='quantity_konversi' placeholder='result ???'><br/>
<?php } $nomor++ ?>
</form>

Your problem is that all the input fields have the same id. In HTML every element/html tag should have a unique id. So if you reference with the id JavaScript will find the first occurence of your id and use this element. All other elements are ignored even though they have the same id.
So remember ids are unique, classes can be used on several elements.
To solve your problem I added an unique ID at the end of the regular quantity id with the PHP variable $nomor:
<input type='text' name='quantity[]' id='quantity<?php echo"$nomor"; ?>' onkeyup="subtotal();">
The PHP server will make the following out of it:
<input type='text' name='quantity[]' id='quantity1' onkeyup="subtotal();">
<input type='text' name='quantity[]' id='quantity2' onkeyup="subtotal();">
...
<input type='text' name='quantity[]' id='quantity5' onkeyup="subtotal();">
You know have a unique id that can be referenced by JavaScript with the help of a running index inside of a for loop:
document.getElementById('quantity'+i).value
The same goes for document.getElementById('packing_value'+i).value
Finally the calculated value is saved in the correct field:
document.getElementById('quantity_konversi'+i).value = hitung;
FULL CODE (runnable at http://phpfiddle.org/):
<script>
function subtotal(konversi){
console.log('subtotal function');
for(var i = 1; i < 5+1; i++){
//console.log('quantity'+i, document.getElementById('quantity'+i).value);
//console.log('packing_value'+i, document.getElementById('packing_value'+i).value);
var hitung = (document.getElementById('quantity'+i).value * document.getElementById('packing_value'+i).value);
//document.forms.demoform.quantity_konversi.value = hitung;
document.getElementById('quantity_konversi'+i).value = hitung;
console.log(i, hitung);
}
}
</script>
<form id='demoform'>
<?php
$jumlah=5;
for($i=0; $i<$jumlah; $i++){
$nomor = $i + 1;
echo"$nomor";
?>
<input type='text' name='quantity[]' id='quantity<?php echo"$nomor"; ?>' onkeyup="subtotal();">
X
<input type='text' id="packing_value<?php echo"$nomor"; ?>" value='10' onkeyup="subtotal();">
<input type='text' name='quantity_konversi[]' id='quantity_konversi<?php echo"$nomor"; ?>' placeholder='result ???'><br/>
<?php
} //for end
$nomor++
?>
</form>

jQuery validates input fields only in the first row of loop

This is my first post here so I apologize in advance if the formatting is wrong.
I am working on a form that pulls data from MySQL using a loop and outputs it to HTML page. The user then has the option to approve or deny the entries, and based on user selection validation should be required or optional. My current code will validate correctly, but only for the first row being outputted from the loop. I am trying to validate all rows. I have tried using a while loop and foreach statement with no success. Any help would be greatly appreciated!
My Loop & Form:
//connect to the database
$db=mysqli_connect('localhost','root','') or die ('I cannot connect to the database because: ' . mysql_error());
//-select the database to use
$mydb=mysqli_select_db($db,"my_db") or die(mysql_error());
//-query the database table
$sql="SELECT id, date, client_name, client_number, date_completed, status FROM clients WHERE client_name LIKE '%" . $search ."%' OR status LIKE '%" . $search ."%' ";
//-run the query against the mysql query function
$result=mysqli_query($db, $sql);
//-count results
$rows=mysqli_num_rows($result);
if($rows=mysqli_num_rows($result)) {
echo "<h2 style='margin-left: 10em;margin-bottom: -0.4em;'><br><br><br>" . $rows . " result(s) found for " . $search . "</h2><br />";
}elseif($rows=mysqli_num_rows($result) == 0) {
echo "<h2 style='margin-left: 10em;margin-bottom: -0.4em;'><br><br><br>0 result(s) found for " . $search . "</h2><br />";
}
//-create while loop and loop through result set
while($row=mysqli_fetch_assoc($result)){
$id=$row['id'];
$date=$row['date'];
$client_name=$row['client_name'];
$client_number=$row['client_number'];
$date_completed=$row['date_completed'];
$status=$row['status'];
echo "<form method='post' enctype='multipart/form-data' action=''>";
echo "<table border='0'>";
echo "<tr>\n";
echo "<td>Timestamp</td><td>Client Name</td><td>Client Number</td>Status</td><td>Date Completed & Returned</td><td>Upload Zip Files</td>\n";
echo "</tr>";
echo "<tr>\n";
echo "<td readonly class='date'>$date</td>\n";
echo "<td><input readonly type='text' id='client_name' name='client_name' value='$client_name'></td>\n";
echo "<td><input readonly type='text' id='client_number' name='client_number' value='$client_number'></td>\n";
echo "<td><select id='status' name='status' aria-invalid='false'>
<option value=''>Select an option</option>
<option value='Denied'>Denied</option>
<option value='Approved'>Approved</option>
</select></td>\n";
echo "<td><input type='date' id='date_completed' name='date_completed_returned' value='$date_completed'></td>\n";
echo "<td><input type='file' id='upload' name='upload'></td>";
echo "<td class='submit'><input type='hidden' id='hidden' name='hidden' value='$client_name'><input type='submit' id='save' name='save' value='Save'></td>\n";
echo "</tr>";
echo "</table>";
echo "</form>";
}
My jQuery code:
I am trying to make date_completed and upload fields required if user selects "Approved" under status field, and optional if he selects "Denied".
<script>
$('#status').on('change', function() {
if ( this.value == 'Approved')
$("#date_completed").prop('required',true)
}).trigger("change"); // notice this line
$('#status').on('change', function() {
if ( this.value == 'Approved')
$("#upload").prop('required',true)
}).trigger("change"); // notice this line
</script>

Thanks to KevinB I was able to find a solution to my problem.
I added class names for the input fields (status, date_completed, upload) I was trying to validate:
Updated code below:
echo "<form method='post' enctype='multipart/form-data' action=''>";
echo "<table border='0'>";
echo "<tr>\n";
echo "<td>Timestamp</td><td>Client Name</td><td>Client Number</td>Status</td><td>Date Completed & Returned</td><td>Upload Zip Files</td>\n";
echo "</tr>";
echo "<tr>\n";
echo "<td readonly class='date'>$date</td>\n";
echo "<td><input readonly type='text' id='client_name' name='client_name' value='$client_name'></td>\n";
echo "<td><input readonly type='text' id='client_number' name='client_number' value='$client_number'></td>\n";
echo "<td><select id='status' name='status' class='status' aria-invalid='false'>
<option value=''>Select an option</option>
<option value='Denied'>Denied</option>
<option value='Approved'>Approved</option>
</select></td>\n";
echo "<td><input type='date' id='date_completed' name='date_completed' class='date_completed' value='$date_completed'></td>\n";
echo "<td><input type='file' id='upload' name='upload' class='upload'></td>";
echo "<td class='submit'><input type='hidden' id='hidden' name='hidden' value='$client_name'><input type='submit' id='save' name='save' value='Save'></td>\n";
echo "</tr>";
echo "</table>";
echo "</form>";
<script>
$('.status').on('change', function() {
if ( this.value == 'Approved')
$('.date_completed').prop('required',true)
}).trigger("change"); // notice this line
$('.status').on('change', function() {
if ( this.value == 'Approved')
$('.upload').prop('required',true)
}).trigger("change"); // notice this line
</script>

Inserting data into two tables resulting in "Array to string conversion"

I'm trying to create a form for my system, user could add the numbers of input fields, the input fields are mostly drop down box with the options coming from tables in the database. The forms would insert the data into two different database. But it shows error of "Array to string conversion" Right now the data only inserted into the first table. Here's what I'd done so far
My form's code:
<form method="post" name="maklumat_akaun" action="proses_daftar_akaun.php">
<label for="NoAkaun">No. Akaun</label>
<input type="text" id="NoAkaun" name="NoAkaun" class="required input_field" required/>
<div class="cleaner_h10"></div>
<label for="KodDaerah">Daerah</label>
<?php
include('dbase.php');$sql = "SELECT KodDaerah, NamaDaerah FROM koddaerah";
$result = mysql_query($sql);
echo "<select name='KodDaerah' id='KodDaerah' class='input_field' required /><option></option>";
while($kod = mysql_fetch_array($result)){
echo "<option value=".$kod['KodDaerah'].">" .$kod['NamaDaerah']."</OPTION>";
}
echo "</select>";
?>
<div class="cleaner_h10"></div>
<label for="KodBahagian">Bahagian</label>
<?php
$sql = "SELECT KodBahagian, NamaBahagian FROM kodbahagian";
$result = mysql_query($sql);
echo "<select name='KodBahagian' id='KodBahagian' class='input_field' required /><option></option>";
while($kod = mysql_fetch_array($result)){
echo "<option value=".$kod['KodBahagian'].">" .$kod['NamaBahagian']."</OPTION>";
}
echo "</select>";
?>
<div class="cleaner_h10"></div>
<label for="KodKategori">Kategori Akaun</label>
<?php
$sql = "SELECT KodKategori, NamaKategori , SubKategori FROM kodkategori";
$result = mysql_query($sql);
echo "<select name='KodKategori' id='KodKategori' class='input_field' required /><option></option>";
while($kod = mysql_fetch_array($result)){
echo "<option value=".$kod['KodKategori'].">" .$kod['NamaKategori']." (".$kod['SubKategori'].")</OPTION>";
}
echo "</select>";
?>
<div class="cleaner_h10"></div>
<label for="Tarif">Tarif</label>
<input type="text" maxlength="4" size="4" id="Tarif" name="Tarif" class="required year_field" onkeyup="this.value=this.value.replace(/[^0-9.]/g,'')">
<div class="cleaner_h10"></div>
<!-----------------------------------------------------------//-->
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script>
$(document).ready(function() {
var max_fields = 25; //maximum input boxes allowed
var wrapper = $(".input_fields_wrap"); //Fields wrapper
var add_button = $(".add_field_button"); //Add button ID
var x = 1; //initial text box count
$(add_button).click(function(e){ //on add input button click
e.preventDefault();
if(x < max_fields){ //max input box allowed
x++; //text box increment
$(wrapper).append('<div>'+
'<td> <?php
$sql = "SELECT KodLokasi, NamaLokasi FROM kodlokasi";
$result = mysql_query($sql);
echo "<select name=\'KodLokasi[]\' id=\'KodLokasi[]\' class=\'input_field\' required ><option></option>";
while($kod = mysql_fetch_array($result)){
echo "<option value=".$kod['KodLokasi'].">" .$kod['NamaLokasi']. "</OPTION>";
}
echo "</select>";
?> </td> </tr>'+
'<tr> <td> <?php
$sql = "SELECT KodJenisAkaun, NamaJenisAkaun FROM kodjenisakaun";
$result = mysql_query($sql);
echo "<select name=\'KodJenisAkaun[]\' id=\'KodJenisAkaun[]\' class=\'input_field\' required ><option></option>";
while($kod = mysql_fetch_array($result)){
echo "<option value=".$kod['KodJenisAkaun'].">" .$kod['NamaJenisAkaun']. "</OPTION>";
}
echo "</select>";
?> </td>'+
'<td> <input type="text" name="NoTelefon[]" id="NoTelefon[]" value="0" class="required input_field"> </td>' +
'Batal</tr></div>'); //add input box
}
});
$(wrapper).on("click",".remove_field", function(e){ //user click on remove text
e.preventDefault(); $(this).parent('div').remove(); x--;
});
});
</script>
<fieldset>
<div class="input_fields_wrap">
<h3 class="add_field_button">Add More Fields</h3>
<table>
<tr>
<td> <label for="KodLokasi">Lokasi</label> </td> <td> <label for="KodJenisAkaun">Jenis Akaun</label> </td> <td> <label>No.Telefon:</label> </td>
</tr>
<tr>
<td> <?php
$sql = "SELECT KodLokasi, NamaLokasi FROM kodlokasi";
$result = mysql_query($sql);
echo "<select name='KodLokasi[]' id='KodLokasi' class='input_field' required /><option></option>";
while($kod = mysql_fetch_array($result)){
echo "<option value=".$kod['KodLokasi'].">" .$kod['NamaLokasi']."</OPTION>";
}
echo "</select>";
?>
</td>
<td> <?php
$sql = "SELECT KodJenisAkaun, NamaJenisAkaun FROM kodjenisakaun";
$result = mysql_query($sql);
echo "<select name='KodJenisAkaun[]' id='KodJenisAkaun' class='input_field' required /><option></option>";
while($kod = mysql_fetch_array($result)){
echo "<option value=".$kod['KodJenisAkaun'].">" .$kod['NamaJenisAkaun']."</OPTION>";
}
echo "</select>";
?>
</td>
<td> <input type="text" name="no_telefon[]" value="0" class="required input_field" onkeyup="this.value=this.value.replace(/[^0-9.]/g,'')"> </td>
</tr>
</table>
</div>
</fieldset>
<!-----------------------------------------------------------//-->
<div class="cleaner_h10"></div>
<div class="cleaner_h10"></div>
<input type="submit" value="Daftar" id="submit" name="register-submit" class="submit_btn" />
<input type="reset" value="Batal" id="reset" name="reset" class="submit_btn" />
</table>
</form>
While this is my code for the inserting process.
<?php
require("dbase.php");
if ($_POST) {
$NoAkaun = isset($_POST['NoAkaun']) ? $_POST['NoAkaun'] : '';
$KodBahagian = isset($_POST['KodBahagian']) ? $_POST['KodBahagian'] : '';
$Tarif = ISSET($_POST['Tarif']) ? $_POST['Tarif'] : '';
$KodDaerah = isset($_POST['KodDaerah']) ? $_POST['KodDaerah'] : '';
$KodKategori = isset($_POST['KodKategori']) ? $_POST['KodKategori'] : '';
$NoTelefon = isset($_POST['NoTelefon']) ? $_POST['NoTelefon'] : '';
$KodLokasi = isset($_POST['KodLokasi']) ? $_POST['KodLokasi'] : '';
$KodJenisAkaun = isset($_POST['KodJenisAkaun']) ? $_POST['KodJenisAkaun'] : '';
$akaun_idAkaun = isset($_POST['akaun_idAkaun']) ? $_POST['akaun_idAkaun'] : '';
$sql = mysql_query("INSERT INTO maklumatakaun VALUES ('', '$NoAkaun' , '$KodBahagian' , '$KodDaerah' , '$KodKategori' , '$Tarif' )");
$akaun_idAkaun = mysql_insert_id();
foreach ($NoTelefon AS $i => $telefon) {
$sql = mysql_query("INSERT INTO detailakaun VALUES ('', '$KodLokasi[$i]', '$KodJenisAkaun' , '$telefon' , '$akaun_idAkaun' )");
}
echo "<script type='text/javascript'> alert('AKAUN BERJAYA DIDAFTARKAN')</script> ";
echo "<script type='text/javascript'>window.location='pilih_kategori_daftar.php'</script>";
}
?>
Can anyone help me figure this out?

The error "Array to string conversion" means you are using an array as a string somewhere in your code. That error message is usually followed by a filename and line number which should help you narrow down your search. One helpful way to see what is contained within a variable is to use the following:
echo '<pre>'; print_r($stuff); die();
If the error is happening on a line inside of a while loop you should put the echo '' before the while and the die(); after so that you can see all instances of the problem within the loop.

I found your problem on this statement
$sql = mysql_query("INSERT INTO detailakaun VALUES ('', '$KodLokasi[$i]', '$KodJenisAkaun' , '$telefon' , '$akaun_idAkaun' )");
$KodJenisAkaun is an array and you use it as a string

Calculation using JS not showing

I am trying to build a web app in php something like stock maintenance, in my earlier page the user is allowed to insert the values of the bill which he gets from the dealer, as in from whom he buys the items which he sells from his shop, hence there he inserts details about the products bought, quantity, price per pc and the rest, i mean total price and the grand total is calculated using JS.
now there is another page where the user sets his profit percent on the grand total(Grand total= total price of the products + Transportation price) and i want the selling price of each item to calculated on its own, using a button.
the rest details are being fetched from the database.
the user sets the profit% on the grand total and now i have used the JS to calculate for each item.
<script type="text/javascript">
function poffy()
{
var d=document.getElementById("ui").value;
var e=document.getElementById("grt").value;
var p=parseFloat(d-e);
var t=document.getElementById("noit").value;
var e=p/parseFloat(t);
for(var b=0;b<parseFloat(t);b++)
{
var c=document.getElementById("costprice").value;
var y=new Array();
y[b]=c;
var f=document.getElementById("quant").value;
var mk=new Array();
mk[b]=f;
var g=e/parseFloat(mk[b]);
var h=g + parseFloat(y[b]);
document.getElementById("sellprice").value=h;
}
}
</script>
Now The problem is that the calculated value is being displayed only once and only for the first item ,not for the other rows.
My php code:
<?php
include("connect.php");
$wer='ccat';
$i=0;
$dater=date("D/M/Y");
$sq="SELECT D_id FROM dealerdetail where Dealer='$wer'";
$res=mysql_query($sq);
while($row=mysql_fetch_array($res))
{
$did=$row["D_id"];
}
$io="Select pdate,tranprice,grandtotal from dateprice where D_id='$did'";
$qw=mysql_query($io);
while($row=mysql_fetch_array($qw))
{
$pd=$row["pdate"];
$as=$row["tranprice"];
$as=0 + $as;
$tr=$row["grandtotal"];
$tr=0 + $tr;
$sql="Select * from additem where Ditem_id='$did'";
$result = mysql_query($sql);
while($pop=mysql_fetch_array($result))
{
$b= $pop["Product"];
$c= $pop["Brand"];
$d= $pop["Model"];
$e= $pop["Dprice"];
$f= $pop["Quantity"];
$t=$e*$f;
$g= $pop["Quality"];
echo "<tr>";
echo "<td> $wer</td>";
echo "<td> $b </td>";
echo "<td> $c </td>";
echo "<td> $d </td>";
echo "<td><input type=text name=costprice id=costprice onkeyup=sell(); class=price value=$e /></td>";
echo "<td><input type=text name=quantity[] class=quantity id=quant value=$f /></td> ";
echo "<td><input name=txt type=text class=txt value=$t readonly /></td> ";
echo "<td><input type=text name=sellprice id=sellprice /></td>" ;
echo "<td> <div align=center ><p>$g<p></div> </td>";
/*echo "<td><input type=text name=purchasedt value=$pd /></td> "; */
echo "<td><input type=text name=current value=$dater /></td>
</tr>";
$i++;
/* if(isset($_POST['S.P']))
{
$po=$_POST['grandy'];
$ap=$po-$tr;
$ao=$ap/$i;
$ai=$ao/$f;
$ul=$_POST['costprice'];
$re=$ai + $ul;
echo $re;
}
*/
}
}
echo "<label>Number Of Items : </label> <input type=text name=no size=6 id=noit value= $i> ";
echo " <label>Dealer Name :</label> <input type=text name=fetch id=fetc readonly />";
echo " <label>Purchase Date :</label> <input name=prdt type=text size=10 class=pur value=$pd readonly /> <br><br> ";
?>
</table>
<?php
echo "<br><br><label> Transport Price :</label><input type = text name=transport value=$as > <br>";
echo " <br><label> Grand Total : </label> <input type = text name=grandy id=grt value=$tr > ";
?>
<br >
<br >
<input type="button" name="proft" onclick="calcu();" value="Profit" />
<input type ="text" name="grandy" id="ui" />

I see you already have a variable $i that you're incrementing on every row, you can use that to make the IDs unique:
echo "<td><input type=text name=costprice id=costprice$i onkeyup=sell(); class=price value=$e /></td>";
echo "<td><input type=text name=quantity[] class=quantity id=quant$i value=$f /></td> ";
echo "<td><input name=txt type=text class=txt value=$t readonly /></td> ";
echo "<td><input type=text name=sellprice id=sellprice$i /></td>" ;
Then change your Javascript to take a parameter that specifies the row:
function poffy(i)
{
var d=document.getElementById("ui").value;
var e=document.getElementById("grt").value;
var p=parseFloat(d-e);
var t=document.getElementById("noit").value;
var e=p/parseFloat(t);
for(var b=0;b<parseFloat(t);b++)
{
var c=document.getElementById("costprice"+i).value;
var y=new Array();
y[b]=c;
var f=document.getElementById("quant"+i).value;
var mk=new Array();
mk[b]=f;
var g=e/parseFloat(mk[b]);
var h=g + parseFloat(y[b]);
document.getElementById("sellprice"+i).value=h;
}
}
I don't see where in your HTML you call the poffy() function. You need to change that code to pass the row number as a parameter.
I noticed another problem in your code. You have the following at the bottom of the table:
echo "<label>Number Of Items : </label> <input type=text name=no size=6 id=noit value= $i> ";
echo " <label>Dealer Name :</label> <input type=text name=fetch id=fetc readonly />";
echo " <label>Purchase Date :</label> <input name=prdt type=text size=10 class=pur value=$pd readonly /> <br><br> ";
Everything in a <table> has to be inside <tr> and <td> or <th> elements. You either need to put those wrappers around this line, or move them out of the table.