With the continuous development of Web technology, more and more websites need to support the function of paging data query. jQuery is a very popular JavaScript library that can help developers more conveniently operate DOM, events, animations, etc., so using jQuery to implement paging query data is a good choice.
This article will introduce the basic principles, steps and code implementation methods of using jQuery to implement paging query data, and provide a simple example for readers' reference.
1. Basic Principle
The basic principle of using jQuery to implement paging query data is to send an asynchronous request to the background through AJAX technology, obtain the data that needs to be displayed, and display it on the page. During the implementation process, the following technologies need to be used:
- AJAX technology: Use jQuery's AJAX method to send asynchronous requests to the background to obtain the data that needs to be displayed.
- Paging algorithm: Calculate the data to be displayed in the background, and then determine the starting position and quantity of the data to be displayed based on the current page number and the number of records displayed on each page.
- HTML, CSS and JavaScript: Use jQuery to operate DOM elements, dynamically generate paging controls, and implement paging functions.
2. Steps
The following are the basic steps to use jQuery to implement paging query data:
- Define a DIV element to display the data that needs to be queried data and set an ID for the element.
- Define a JavaScript function to send an asynchronous request to the background and display the obtained data in the specified DIV element.
- Define a JavaScript function to generate a paging control and set event listeners for each button of the paging control.
- After the page is loaded, call the above two functions to display the data and paging controls of the first page.
- When the user clicks the button on the paging control, the first function is called to obtain the data of the specified page number and display it in the specified DIV element.
3. Code Implementation
The following is a simple example code that uses jQuery to implement paging query data:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>分頁(yè)查詢數(shù)據(jù)示例</title>
<script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.min.js"></script>
<script src="paging.js"></script>
<link rel="stylesheet" href="paging.css">
</head>
<body>
<div id="data"></div>
<div id="paging"></div>
<script>
$(document).ready(function() {
// 顯示第一頁(yè)數(shù)據(jù)和分頁(yè)控件
getDataWithPage(1);
generatePaging(1);
// 為分頁(yè)控件上的按鈕添加事件監(jiān)聽(tīng)器
$('#paging').on('click', '.page-btn', function() {
var page = parseInt($(this).data('page'));
getDataWithPage(page);
generatePaging(page);
});
});
</script>
</body>
</html>/*
* 分頁(yè)查詢數(shù)據(jù)相關(guān)的 JavaScript 函數(shù)
*/
var PAGE_SIZE = 10; // 每頁(yè)顯示的記錄數(shù)
var TOTAL_PAGES = 20; // 總頁(yè)數(shù)（假設(shè)為 20）
// 向后臺(tái)發(fā)送異步請(qǐng)求，獲取指定頁(yè)碼的數(shù)據(jù)，并將其顯示在指定的 DIV 元素中
function getDataWithPage(page) {
var startIndex = (page - 1) * PAGE_SIZE + 1;
var endIndex = startIndex + PAGE_SIZE - 1;
$.ajax({
url: 'data.php', // 后臺(tái)數(shù)據(jù)接口 URL
method: 'GET',
data: {
startIndex: startIndex,
endIndex: endIndex
},
success: function(data) {
// 將獲取到的數(shù)據(jù)顯示在指定的 DIV 元素中
$('#data').html(data);
},
error: function() {
alert('獲取數(shù)據(jù)失敗');
}
});
}
// 生成分頁(yè)控件，并為分頁(yè)控件的每個(gè)按鈕設(shè)置事件監(jiān)聽(tīng)器
function generatePaging(currentPage) {
var pagingHTML = '<ul>';
if (currentPage == 1) {
pagingHTML += '<li><span class="disabled">上一頁(yè)</span></li>';
} else {
pagingHTML += '<li><a href="javascript:void(0);" class="page-btn" data-page="' + (currentPage - 1) + '">上一頁(yè)</a></li>';
}
for (var i = 1; i <= TOTAL_PAGES; i++) {
if (i === currentPage) {
pagingHTML += '<li><span class="current">' + i + '</span></li>';
} else {
pagingHTML += '<li><a href="javascript:void(0);" class="page-btn" data-page="' + i + '">' + i + '</a></li>';
}
}
if (currentPage == TOTAL_PAGES) {
pagingHTML += '<li><span class="disabled">下一頁(yè)</span></li>';
} else {
pagingHTML += '<li><a href="javascript:void(0);" class="page-btn" data-page="' + (currentPage + 1) + '">下一頁(yè)</a></li>';
}
pagingHTML += '</ul>';
$('#paging').html(pagingHTML);
}/*
* 分頁(yè)控件相關(guān)的 CSS 樣式
*/
#paging ul {
margin: 0;
padding: 0;
list-style-type: none;
}
#paging ul li {
display: inline-block;
margin: 0 5px;
padding: 0;
}
#paging ul li span {
display: inline-block;
padding: 5px 15px;
border: 1px solid #ddd;
background-color: #fff;
color: #333;
cursor: default;
}
#paging ul li a {
display: inline-block;
padding: 5px 15px;
border: 1px solid #ddd;
background-color: #fff;
color: #333;
text-decoration: none;
}
#paging ul li a:hover {
background-color: #f5f5f5;
}
#paging ul li .current {
display: inline-block;
padding: 5px 15px;
border: 1px solid #ddd;
background-color: #f5f5f5;
color: #333;
cursor: default;
}
#paging ul li .disabled {
display: inline-block;
padding: 5px 15px;
border: 1px solid #ddd;
background-color: #fff;
color: #bbb;
cursor: default;
}It should be noted that the above code is a A simple example, which needs to be adjusted and optimized according to actual conditions in actual applications. At the same time, it is also necessary to ensure the normal operation and data security of the background data interface to avoid SQL injection and other attacks.
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