How to store data if checkbox is selected - php

Question

I'm doing this one using PHP.
I'm doing some basic quiz application and it has a backend. On my backend, I am setting up a quiz for students to answer. One of my interface is like this.
If the user checked the box, it means 1950 is the answer. How would I process that one in my database to determine that 1950 has been the answer of the question.
My Database is like this.
tbl_choices
Id,Choice,isAnswer
so ideally, it would be stored like this.
tbl_choices
ID CHOICE isAnswer
001 1900 0
002 1800 0
003 1950 1
004 1850 0
My question here is how would I code it in a sense when a user will check the checkbox and the textinput right beside it will have a value of isAnswer as 1.
Just an additional info: When a user will click that + button it will add a new textinput and if user will click - button it will delete a textinput, but I got that all covered.
The choices are dynamic, it will changed, that above that I've shown you is just an example.
P.S: Sorry for the title, I don't know what's the title of this kind of question :-)
Your help would be greatly appreciated and rewarded!

Answer 1

you can try html like this :
<input type="checkbox" value="1900" name="answer1[]">
<input type="text" value="1900" name="answer2[]" />
<input type="checkbox" value="1800" name="answer1[]">
<input type="text" value="1800" name="answer2[]" />
<input type="checkbox" value="1950" name="answer1[]">
<input type="text" value="1950" name="answer2[]" />
<input type="checkbox" value="1850" name="answer1[]">
<input type="text" value="1850" name="answer2[]" />
and then use php code:
foreach($_POST['answer2'] as $v){
if(in_array($v, $_POST['answer1'])) {
$s = 1;
}else
$s = 0;
$sql = "INSERT INTO table VALUES(null, $v, $s)";
}
also on click plus update values of both check box and text field

Answer 2

in general you can use checkboxes as an array when submiting information, just name the checkboxes as an array like
<input type="checkbox" value="1900" name="answer1[]">
<input type="checkbox" value="1800" name="answer1[]">
<input type="checkbox" value="1950" name="answer1[]">
<input type="checkbox" value="1850" name="answer1[]">
then on the server side you handle $_POST["answer1"] as an array and cycle through the possible answers, something like this
if (is_array($_POST["answer1"]))
{
foreach($_POST["answer1"] as $answer)
{
// insert into database here
}
}
important: this will only show what a user actualy selected, if an option is not clicked then it will not be part of the array

Answer 3

I think it would make sense to have more than one table, one for the questions with their options and then one for the answers with the fields id, choice_id. Otherwise it is going to make generating the questions a lot more difficult especially when a number of students answer the same question?

Answer 4

One more thing, you could add up in the answers of your question, add row and delete row based on + and - button.
The code for that:
<script type="text/javascript">
$(document).ready(function() {
$("#plus").click(function() {
$('#mytable2 tbody>tr:last').clone(true).
insertAfter('#mytable2 tbody>tr:last');
$('#mytable2 tbody>tr:last #st').val('');
$('#mytable2 tbody>tr:last #newst').val('');
$('#mytable2 tbody>tr:last #plus').val('+');
return false;
});
});
for more detail, you may refer following link:
Add Row on Button click