I have two select boxes in which 1st one is having names of Units and second one has names of chapters. My problem is whenever I am selecting option in the first select box option i.e. Units, my second drop down i.e. Chapters becomes empty. While doing reverse, i.e. if I am selecting the chapters first and then Unit, again the chapters becomes blank. What could be the possible reason behind it? Here is my code,
function selectBoxsearch($tableName, $field1, $field2, $value)
{
echo "<option value=''>--Select--</option>";
$sq=mysql_query("SELECT * FROM $tableName where status=1 order by id ASC");
while($row=mysql_fetch_array($sq))
{
if($value==$row[$field1])
{
echo "<option value='$row[$field1]' selected='selected'; >$row[$field2]</option>";
}
else
{
echo "<option value='$row[$field1]' >$row[$field2]</option>";
}
}
}
<div class="form-group">
<div class="col-md-12">
<div class="col-md-3">
<label for="username" class="control-label">Select Unit:</label>
</div>
<div class="col-md-9">
<select name="unit_id" class="form-control" required="" id="unit_id">
<?php $fnc->selectBoxsearch("tbl_question_module","id","title", $unit_id) ; ?>
</select>
</div>
</div>
</div>
<div class="form-group">
<div class="col-md-12">
<div class="col-md-3">
<label for="username" class="control-label">Select Chapter:</label>
</div>
<div class="col-md-9">
<select name="chapter" class="form-control" required id="chapter_id" >
<option value="">Select</option>
<?php
$sql = mysql_query("SELECT id, title FROM tbl_studymaterials where status =1 ");
while ($row = mysql_fetch_assoc($sql)){
$chapter = $row['title'];
echo "<option value=" . $row['id'] . ">" . $chapter . "</option>";
}
?>
</select>
</div>
</div>
</div>
