Al momento de enviar un registro este método me hace lo que quiero, que es mediante varios select option seleccionar un valor el cual es un numero entero y en un campo marcado como hidden colocar el resultado de la suma de dichos números o campos y en otro campo que si es visible sacar el promedio de dicha suma, el problema esta en que cuando yo quiero aplicar el mismo método para mi formulario actualizar al momento de hacer las operaciones ya no las hace y al momento de inspeccionar la pagina me muestra este error `Uncaught TypeError: document.calculadora.nota1 is undefined

I am currently trying to output data from my php file into javascript, but I get this error:
(https://i.sstatic.net/9QL2o1bK.png)

i have admin index and master is my backend i want to make the button copy duplicates an appointment and can be edited without effecting the initial one when i edit the duplicated or the initail both got effected and i cant edit the rest of the appointmnets too the data base works correctly but in my website it didnt changes

I’m having trouble identifying the issue with my form submission. Despite my efforts, I can’t figure out why my form isn’t sending the data properly. As a result, the constant formData = new FormData(formu) is empty. I’ve reviewed the code multiple times but still can’t pinpoint the problem. If you could provide any assistance or guidance on this matter, I would greatly appreciate it.

I have this page to load the dcm files contained in a folder and try to obtain thumbnail pictures on the left and full images on the right once the small images are clicked… unfortunately, all thumbnails are blank and I cannot understand the reason!!!

After clicking on button incrementBtn there is html input file type created in div attachments by this Javascript function:

After clicking on button incrementBtn there is html input file type created in div attachments by this Javascript function:

<?php $result = mysqli_query($con, $sql); while ($row = mysqli_fetch_array($result)) { echo ‘<tr><td>’; echo ‘<h5 style=”margin-left:6px; color:black;”>’ . $row[‘id’] . ‘</h5>’; echo ‘</td><td>’; echo ‘<img src=”‘. $row[‘imagem’]. ‘” alt>’; echo ‘<a href=”#” class=”user-link”>’. $row[‘nome’] . ‘</a>’; echo ‘</td><td>’; echo ‘<h5 style=”margin-left:-180px; color:black;”>’. $row[‘idaluno’] . ‘</h5></td>’; echo ‘<td class=”text-center”>’; echo ‘<h5 style=”margin-left:6px; color:black; margin-left:-297px;”>’. $row[‘situacao’] .'</h5>’; echo […]

I am thinking about making a links into affiliate links by using JavaScript. But cannot make a affiliate links. Please, help me about this.

I am trying to build a database admin panel for a project and I want to be able to edit a specific entry by clicking on a button on the specific table row. I need a way to pass the value of the button, which is set to the id of the entry, to a php script redirect page but also to the same page because when you would press the button a prefilled form woukd pop up. Any way to do that? This is my first ever HTML/Javascript/PHP project.