linuxartisan linuxartisan - 4 months ago 14
PHP Question

Handsontable giving unexpected number of columns

I have implemented handsontable for getting data from user.
This is my script

<script type="text/javascript">
$(document).ready(function() {
$('#quiz_questions').handsontable({
rowHeaders: true,
colHeaders: ['Question', 'Option 1', 'Option 2', 'Option 3', 'Option 4', 'Answer', 'Marks'],
columns: [
{
type: 'text',
allowEmpty: false
},
{
type: 'text',
allowEmpty: false
},
{
type: 'text',
allowEmpty: false
},
{
type: 'text',
allowEmpty: true
},
{
type: 'text',
allowEmpty: true
},
{
type: 'dropdown',
source: ['Option 1', 'Option 2', 'Option 3', 'Option 4'],
allowEmpty: false
},
{
type: 'numeric',
allowEmpty: false
}
],
stretchH: 'all',
minSpareRows: 0,
minSpareColumns: 0,
minRows : 25
});

var hotInstance = $("#quiz_questions").handsontable('getInstance');

$('#btnSave').click(function(e){
e.preventDefault();
$('#btnSave').prop("disabled", true);
//alert('btnclicked');

var dynFrm = $('<form>', {
'action': '{{ action('QuizQuestionController@storeBulk') }}',
'method': 'POST'
}).append($('<input>', {
'type': 'hidden',
'name': '_token',
'value': '{{ csrf_token() }}'
})).append($('<input>', {
'type': 'hidden',
'name': 'quiz_id',
'value': '{{ $quiz->quiz_id }}'
})).append($('<input>', {
'type': 'hidden',
'name': 'data',
'value': JSON.stringify(hotInstance.getData())
}));
dynFrm.appendTo(document.body).submit();
});

});

</script>


The
storeBulk()
function of
QuizQuestionController
processes the data.

public function storeBulk()
{
// get the quiz model
$quiz = Quiz::findOrFail(Input::get('quiz_id'));

// get the data
$data = Input::get('data');
$jData = json_decode($data);

//process the recevied data
foreach($jData as $row) {
$quizQuestion = new QuizQuestion();

$quizQuestion->quiz_id = $quiz->quiz_id;
$quizQuestion->question_no = $cnt;
$quizQuestion->question_text = trim($row[0]) ? : null;
$quizQuestion->options = $this->processOptions([
trim($row[1]),
trim($row[2]),
trim($row[3]),
trim($row[4])
]);
$quizQuestion->answer = $this->processAnswer($row[5]);
$quizQuestion->marks = trim($row[6]) ? : null;

...
}


Now the problem is, for rows that are left empty in the handsontable while filling the data, I should get
data
for those rows as
[null,null,null,null,null,null,null]
. But this is not the case. For some rows I get
[null,null,null,null,null]
(only 5 values). Thus I get an
ErrorException
saying
Undefined offset: 5
.

I have noticed this happens for first 5 rows only. What could be the problem?

Answer

Pinpointed the problem.

I have noticed this happens for first 5 rows only. What could be the problem?

There's a startRows property of handsontable which defaults to 5. Hence the problem with the first 5 rows. I set the property explicitly to

startRows: 0,

And also modified the storeBulk() function to ignore errors.

$quizQuestion->question_text = trim(@$row[0]) ? : null;
$quizQuestion->options = $this->processOptions([
                                   trim(@$row[2]),
                                   trim(@$row[3]),
                                   trim(@$row[4]),
                                   trim(@$row[5])
                                ]);
$quizQuestion->answer = $this->processAnswer(@$row[6]);
$quizQuestion->marks = trim(@$row[7]) ? : null;

Now everything works correctly.

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