我的问题是基于这个写得很好的教程: http://www.sanwebe.com/2013/03/loading-more-results-from-database
演示: http://www.sanwebe.com/downloads/43-load-more-results
基本上我正在努力实现这个+搜索。从某种意义上说,将根据用户的搜索查询填充结果。
让我详细说明代码:
这是主页
<?php
include("includes/db.php");
$results = mysqli_query($con,"SELECT COUNT(*) FROM courses");
$get_total_rows = mysqli_fetch_array($results); //total records
//break total records into pages
$item_per_page = 10;
$total_pages = ceil($get_total_rows[0]/$item_per_page);
?>
<html>
<head>
<script type="text/javascript" src="js/jquery-1.9.0.min.js"></script>
<script>
$(document).ready(function() {
var track_click = 0; //track user click on "load more" button, righ now it is 0 click
var total_pages = <?php echo $total_pages; ?>;
$('#results').load("fetch_pages.php", {'page':track_click}, function() {track_click++;}); //initial data to load
$(".load_more").click(function (e) { //user clicks on button
$(this).hide(); //hide load more button on click
$('.animation_image').show(); //show loading image
if(track_click <= total_pages) //user click number is still less than total pages
{
//post page number and load returned data into result element
$.post('fetch_pages.php',{'page': track_click}, function(data) {
$(".load_more").show(); //bring back load more button
$("#results").append(data); //append data received from server
//scroll page smoothly to button id
$("html, body").animate({scrollTop: $("#load_more_button").offset().top}, 500);
//hide loading image
$('.animation_image').hide(); //hide loading image once data is received
track_click++; //user click increment on load button
}).fail(function(xhr, ajaxOptions, thrownError) { //any errors?
alert(thrownError); //alert with HTTP error
$(".load_more").show(); //bring back load more button
$('.animation_image').hide(); //hide loading image once data is received
});
if(track_click >= total_pages-1) //compare user click with page number
{
//reached end of the page yet? disable load button
$(".load_more").attr("disabled", "disabled");
}
}
});
});
</script>
</head>
<body>
<center>
<form method="get" action="testSearch.php" enctype="multipart/form-data" autocomplete="off">
<input type="text" class="search" id="searchid" name="user_query" id="searchBar" placeholder="Search for courses" />
<input type="submit" id="searchButton" name="search" value="search" class="btn btn-danger" autocomplete="off"/>
<div id="results"></div>
<div align="center">
<button class="load_more" id="load_more_button">load More</button>
<div class="animation_image" style="display:none;"><img src="ajax-loader.gif"> Loading...</div>
</div>
</body>
</html>
这是fetch_page.php,基本上是从以下位置填充内容的地方:
<?php
include("includes/db.php");
//sanitize post value
$page_number = filter_var($_POST["page"], FILTER_SANITIZE_NUMBER_INT, FILTER_FLAG_STRIP_HIGH);
//throw HTTP error if page number is not valid
if(!is_numeric($page_number)){
header('HTTP/1.1 500 Invalid page number!');
exit();
}
$item_per_page = 10;
//get current starting point of records
$position = ($page_number * $item_per_page);
//Limit our results within a specified range.
$results = mysqli_query($con,"SELECT course_title, course_date1, course_provider,course_sdesc FROM courses ORDER BY course_date1 DESC LIMIT $position, $item_per_page");
//output results from database
echo '<ul class="page_result">';
while($row = mysqli_fetch_array($results))
{
echo '<li id="item_'.$row["course_title"].'"><span class="page_name">'.$row["course_date1"].') '.$row["course_provider"].'</span><span class="page_message">'.$row["course_sdesc"].'</span></li>';
}
echo '</ul>';
?>
现在深入了解详情:
以下是允许搜索发生的表单(在索引页面的内容中):
<form method="get" action="testSearch.php" enctype="multipart/form-data" autocomplete="off">
<input type="text" class="search" id="searchid" name="user_query" id="searchBar" placeholder="Search for courses" />
我想做的事情,我没有取得如此成功的是以下几点: 在主页面的标题中(在计算分页的页面代码中):我正在考虑进行以下更改:
if(isset($_GET['user_query']))
{
$search_query = $_GET['user_query'];
$results = mysqli_query($con,"SELECT COUNT(*) FROM courses where course_title like '%$search_query%'");
$get_total_rows = mysqli_fetch_array($results); //total records
//break total records into pages
$item_per_page = 10;
$total_pages = ceil($get_total_rows[0]/$item_per_page);
}
?>
如果尝试在fetch页面中也通过将代码调整为以下内容来执行相同的操作:
<?php
include("includes/db.php");
if(isset($_GET['user_query']))
{
$search_query = $_GET['user_query'];
//sanitize post value
$page_number = filter_var($_POST["page"], FILTER_SANITIZE_NUMBER_INT, FILTER_FLAG_STRIP_HIGH);
//throw HTTP error if page number is not valid
if(!is_numeric($page_number)){
header('HTTP/1.1 500 Invalid page number!');
exit();
}
$item_per_page = 10;
//get current starting point of records
$position = ($page_number * $item_per_page);
//Limit our results within a specified range.
$results = mysqli_query($con,"SELECT course_title, course_date1, course_provider,course_sdesc FROM courses ORDER BY course_date1 where course_title like '%$search_query%' DESC LIMIT $position, $item_per_page");
//output results from database
echo '<ul class="page_result">';
while($row = mysqli_fetch_array($results))
{
echo '<li id="item_'.$row["course_title"].'"><span class="page_name">'.$row["course_date1"].') '.$row["course_provider"].'</span><span class="page_message">'.$row["course_sdesc"].'</span></li>';
}
echo '</ul>';
}
?>
然后没有任何反应。
我认为问题在于我试图从另一个页面的url中检索变量。换句话说,fetch_page.php正试图从testSearch.php中检索user_query =,我不知道如何解决它。
新方法: 我把它放到了现场,所以你可以知道我想要做什么: http://testapplication220-env.elasticbeanstalk.com/testSearch.php
在testSearch.php(主页上,我这样做是为了获取用户搜索查询并稍后检索它)。
session_start();
$search_query = $_GET['user_query'];
$_SESSION['userSearch'] = $search_query;
$results = mysqli_query($con,"SELECT COUNT(*) FROM courses where course_title like '%$search_query%'");
然后获取页面(功能,我尝试执行以下操作):
session_start();
//sanitize post value
$page_number = filter_var($_POST["page"], FILTER_SANITIZE_NUMBER_INT, FILTER_FLAG_STRIP_HIGH);
//throw HTTP error if page number is not valid
if(!is_numeric($page_number)){
header('HTTP/1.1 500 Invalid page number!');
exit();
}
$item_per_page = 10;
//get current starting point of records
$position = ($page_number * $item_per_page);
//Limit our results within a specified range.
$results = mysqli_query($con,"SELECT course_title, course_date1, course_provider,course_sdesc FROM courses ORDER BY course_date1 where course_title like '%$_SESSION['userSearch']%' DESC LIMIT $position, $item_per_page");
答案 0 :(得分:0)
我想我得到了答案
如果页面变量不包含数字,则抛出500错误。
使用filter_var函数从post数组中转义页面变量
但根据php.net filter_var只会验证数据不会将其转换为否。我在phpfiddle中测试它也返回字符串。
var_dump(filter_var('23',FILTER_SANITIZE_NUMBER_INT, FILTER_FLAG_STRIP_HIGH));
所以在通过is_numeric比较页面之前,你必须将它转换成可以通过以下方式完成的整数
$page = (int) $page;