【发布时间】：2016-05-05 22:14:51
【问题描述】：
这是一个基本的数据表fiddle
这是fiddle 和lengthMenu 的基本数据表
我想要做的是让这个在我的服务器端处理示例中工作。
我可以在我的index.php 文件中正确显示下拉列表。
$(document).ready(function() {
var dataTable = $('#employee-grid').DataTable({
"lengthMenu": [
[10, 25, 50, -1],
[10, 25, 50, "All"]
],
"processing": true,
"serverSide": true,
"ajax": {
url: "employee-grid-data.php", // json datasource
type: "post", // method , by default get
error: function() { // error handling
$(".employee-grid-error").html("");
$("#employee-grid").append('<tbody class="employee-grid-error"><tr><th colspan="3">No data found in the server</th></tr></tbody>');
$("#employee-grid_processing").css("display", "none");
}
}
});
});
所以如果我选择 10、25 或 50 就可以，但如果我选择 All 我会得到 No data found in the server。
所以我的问题在我的employee-grid-data.php 文件中，注明here，这就是我遇到困难的地方。我需要做一个 if 语句来处理这个All 选项或-1，因为这是我在$requestData['length'] 中选择All 时传递给服务器的内容
我已经确定了我使用$requestData['length'] 的两个领域，我相信这就是问题所在。
$sql.=" ORDER BY ". $columns[$requestData['order'][0]['column']]." ".$requestData['order'][0]['dir']." LIMIT ".$requestData['start']." ,".$requestData['length']." "; // $requestData['order'][0]['column'] contains colmun index, $requestData['order'][0]['dir'] contains order such as asc/desc , $requestData['start'] contains start row number ,$requestData['length'] contains limit length.
$query=mysqli_query($conn, $sql) or die("employee-grid-data.php: get employees"); // again run query with limit
所以我要做的就是尝试这样写：
如果$requestData['length'] 不等于-1
做这行
否则
在不使用$requestData['length'] 作为参数的情况下执行此行。
这是我遇到困难的地方。
这是我的尝试，但这可能是语法问题或其他问题。我不是很擅长调试这个。
if ($requestData['length']!==-1){
$sql.=" ORDER BY ". $columns[$requestData['order'][0]['column']]." ".$requestData['order'][0]['dir']." LIMIT ".$requestData['start']." ,".$requestData['length']." ";
} else {
$sql.=" ORDER BY ". $columns[$requestData['order'][0]['column']]." ".$requestData['order'][0]['dir']
}
$query=mysqli_query($conn, $sql) or die("employee-grid-data.php: get employees");
当我访问页面index.php 时，我得到No data found in the server，在控制台中我得到500 (Internal Server Error)。
谁能建议我的代码应该是什么样子？ 或者我该如何调试？
理想情况下，我希望能够添加一个基本的 if else 语句，以查看我是否可以单独完成这一点，但不确定如何在此设置中执行此操作。使用 Javasecript 我通常会使用 console.log
这是我的整个employee-grid-data.php 文件供参考：
<?php
/* Database connection start */
$servername = "localhost";
$username = "root";
$password = "Password1";
$dbname = "test";
$conn = mysqli_connect($servername, $username, $password, $dbname) or die("Connection failed: " . mysqli_connect_error());
/* Database connection end */
// storing request (ie, get/post) global array to a variable
$requestData= $_REQUEST;
$columns = array(
// datatable column index => database column name
0 =>'employee_name',
1 => 'employee_salary',
2=> 'employee_age'
);
// getting total number records without any search
$sql = "SELECT employee_name, employee_salary, employee_age ";
$sql.=" FROM employee";
$query=mysqli_query($conn, $sql) or die("employee-grid-data.php: get employees");
$totalData = mysqli_num_rows($query);
$totalFiltered = $totalData; // when there is no search parameter then total number rows = total number filtered rows.
if( !empty($requestData['search']['value']) ) {
// if there is a search parameter
$sql = "SELECT employee_name, employee_salary, employee_age ";
$sql.=" FROM employee";
$sql.=" WHERE employee_name LIKE '".$requestData['search']['value']."%' "; // $requestData['search']['value'] contains search parameter
$sql.=" OR employee_salary LIKE '".$requestData['search']['value']."%' ";
$sql.=" OR employee_age LIKE '".$requestData['search']['value']."%' ";
$query=mysqli_query($conn, $sql) or die("employee-grid-data.php: get employees");
$totalFiltered = mysqli_num_rows($query); // when there is a search parameter then we have to modify total number filtered rows as per search result without limit in the query
if ($requestData['length']!==-1){
$sql.=" ORDER BY ". $columns[$requestData['order'][0]['column']]." ".$requestData['order'][0]['dir']." LIMIT ".$requestData['start']." ,".$requestData['length']." "; // $requestData['order'][0]['column'] contains colmun index, $requestData['order'][0]['dir'] contains order such as asc/desc , $requestData['start'] contains start row number ,$requestData['length'] contains limit length.
} else {
$sql.=" ORDER BY ". $columns[$requestData['order'][0]['column']]." ".$requestData['order'][0]['dir']
}
$query=mysqli_query($conn, $sql) or die("employee-grid-data.php: get employees"); // again run query with limit
} else {
$sql = "SELECT employee_name, employee_salary, employee_age ";
$sql.=" FROM employee";
if ($requestData['length']!==-1){
$sql.=" ORDER BY ". $columns[$requestData['order'][0]['column']]." ".$requestData['order'][0]['dir']." LIMIT ".$requestData['start']." ,".$requestData['length']." ";
} else {
$sql.=" ORDER BY ". $columns[$requestData['order'][0]['column']]." ".$requestData['order'][0]['dir']
}
$query=mysqli_query($conn, $sql) or die("employee-grid-data.php: get employees");
}
$data = array();
while( $row=mysqli_fetch_array($query) ) { // preparing an array
$nestedData=array();
$nestedData[] = $row["employee_name"];
$nestedData[] = $row["employee_salary"];
$nestedData[] = $row["employee_age"];
$data[] = $nestedData;
}
$json_data = array(
"draw" => intval( $requestData['draw'] ), // for every request/draw by clientside , they send a number as a parameter, when they recieve a response/data they first check the draw number, so we are sending same number in draw.
"recordsTotal" => intval( $totalData ), // total number of records
"recordsFiltered" => intval( $totalFiltered ), // total number of records after searching, if there is no searching then totalFiltered = totalData
"data" => $data // total data array
);
echo json_encode($json_data); // send data as json format
?>
edit1很好的测试链接http://phpfiddle.org/
【问题讨论】：
标签： php datatables