[英]how to fill options in html select based on an html field filled by user.
這是代碼片段:
<select name="isbn" onchange=" ">
<?php
//Displaying all ISBN in drop down
$result = mysqli_query($con,"SELECT * FROM book");
while($row = mysqli_fetch_array($result)) {
?>
<option> <?php echo $row['ISBN']; ?></option>
<?php } ?>
</select>
</label></td>
</tr>
<tr>
<td>Copy Number </td>
<td><select name="copy_number">
<?php
//Now based on selected book I want to fetch number of copies from database
$result = mysqli_query($con,"SELECT number_of_copies FROM book where isbn = [ SELECTE VALUE FROM ABOVE]");
?>
我怎樣才能做到這一點?
您可以使用jQuery ajax和簡單的php處理程序來獲取所選書籍的副本,
<select name="isbn">
.....
</select>
<div id="copies"></div>
<script>
$.ajax({
url: "getCopies.php?",
data: "isbn=" + $("select[name='isbn']").val(),
type: "POST",
dataType: "json",
success: function(response) {
$.each(response, function(i, item) {
$("#copies").append(item.name); // Sample json format {id: "213123", name:"Lord of the rings", isbn:"887799..."}
})
}
});
</script>
getCopies.php
<?php
$isbn = $_POST["isbn"];
// Some db connections
$result = mysqli_query($con,"SELECT number_of_copies FROM book where isbn = $isbn");
$resultArr = array();
while($row = mysqli_fetch_array($result)) {
$resultArr[] = $row;
}
echo json_encode($resultArr); // This will return rows in json format. You can iterate it in js side
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