AJAX can provide users with a more friendly and interactive search experience. This article will explain the relevant knowledge of AJAX real-time search.
AJAX Live Search
In the following example, we will demonstrate a real-time search, and you can get the search results while you type the data.
Real-time search has many advantages over traditional search:
When you type in data, matching results will be displayed
When you continue to type in data, Filter the results
If there are too few results, delete characters to get a wider range
Enter "HTML" in the text box below to search for pages containing HTML:
The results in the above example are searched in an XML file (links.xml). To keep this example small and simple, we only provide 6 results.
Explanation of examples - HTML page
When the user types characters in the input box above, the "showResult()" function will be executed. This function is triggered by the "onkeyup" event:
<html><head><script>function showResult(str){ if (str.length==0) { document.getElementById("livesearch").innerHTML=""; document.getElementById("livesearch").style.border="0px"; return; } if (window.XMLHttpRequest) {// IE7+, Firefox, Chrome, Opera, Safari 浏览器执行 xmlhttp=new XMLHttpRequest(); } else {// IE6, IE5 浏览器执行 xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); } xmlhttp.onreadystatechange=function() { if (xmlhttp.readyState==4 && xmlhttp.status==200) { document.getElementById("livesearch").innerHTML=xmlhttp.responseText; document.getElementById("livesearch").style.border="1px solid #A5ACB2"; } } xmlhttp.open("GET","livesearch.php?q="+str,true); xmlhttp.send();}</script></head><body><form><input type="text" size="30" onkeyup="showResult(this.value)"><div id="livesearch"></div></form></body></html>Copy after login
Source code explanation:
If the input box is empty (str.length==0), this function will Clear the contents of the livesearch placeholder and exit the function.
If the input box is not empty, then showResult() will perform the following steps:
Create an XMLHttpRequest object
Create a function that is executed when the server response is ready
Send a request to the file on the server
Please pay attention to the parameter (q) added to the end of the URL (contains the content of the input box)
PHP file
The above paragraph The server page called via JavaScript is a PHP file named "livesearch.php". The source code in
"livesearch.php" searches the XML file for headers that match the search string and returns the results:
<?php
$xmlDoc=new DOMDocument();$xmlDoc->load("links.xml");$x=$xmlDoc->getElementsByTagName('link');// 从 URL 中获取参数 q 的值$q=$_GET["q"];// 如果 q 参数存在则从 xml 文件中查找数据if (strlen($q)>0){ $hint=""; for($i=0; $i<($x->length); $i++) { $y=$x->item($i)->getElementsByTagName('title'); $z=$x->item($i)->getElementsByTagName('url'); if ($y->item(0)->nodeType==1) { // 找到匹配搜索的链接 if (stristr($y->item(0)->childNodes->item(0)->nodeValue,$q)) { if ($hint=="") { $hint="<a href='" . $z->item(0)->childNodes->item(0)->nodeValue . "' target='_blank'>" . $y->item(0)->childNodes->item(0)->nodeValue . "</a>"; } else { $hint=$hint . "<br /><a href='" . $z->item(0)->childNodes->item(0)->nodeValue . "' target='_blank'>" . $y->item(0)->childNodes->item(0)->nodeValue . "</a>"; } } } }}// 如果没找到则返回 "no suggestion"if ($hint==""){ $response="no suggestion";}else{ $response=$hint;}// 输出结果echo $response;?>Copy after login
if JavaScript sent any text (i.e. strlen($q) > 0), what will happen:
Load the XML file into a new XML DOM object
Traverse all
elements in order to find matching JavaScript The text passed </p>
<p> sets the correct URL and title in the "$response" variable. If more than one match is found, all matches are added to the variable. </p>
<p>If no match is found, set the $response variable to "no suggestion". </p>
<p>This article explains the relevant knowledge of AJAX real-time search in detail. For more learning materials, please pay attention to the php Chinese website. </p>
<p>Related recommendations: </p>
<p><a href="http://www.php.cn/php-weizijiaocheng-395479.html">About PHP Example - Interaction between AJAX and XML</a><br></p>
<p><a href="http://www.php.cn/php-weizijiaocheng-395476.html">About PHP - Between AJAX and MySQL Interaction</a><br></p>
<p><a href="http://www.php.cn/php-weizijiaocheng-395474.html">#About PHP - The connection between AJAX and PHP</a><br></p><p>The above is the detailed content of PHP Example - Knowledge about AJAX real-time search. For more information, please follow other related articles on the PHP Chinese website!</p>
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<a href="https://www.php.cn/faq/1796795196.html" title="PHP: A Key Language for Web Development" class="phphistorical_Version2_mids_img">
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<a href="https://www.php.cn/faq/1796795196.html" title="PHP: A Key Language for Web Development" class="phphistorical_Version2_mids_title">PHP: A Key Language for Web Development</a>
<span class="Articlelist_txts_time">Apr 13, 2025 am 12:08 AM</span>
<p class="Articlelist_txts_p">PHP is a scripting language widely used on the server side, especially suitable for web development. 1.PHP can embed HTML, process HTTP requests and responses, and supports a variety of databases. 2.PHP is used to generate dynamic web content, process form data, access databases, etc., with strong community support and open source resources. 3. PHP is an interpreted language, and the execution process includes lexical analysis, grammatical analysis, compilation and execution. 4.PHP can be combined with MySQL for advanced applications such as user registration systems. 5. When debugging PHP, you can use functions such as error_reporting() and var_dump(). 6. Optimize PHP code to use caching mechanisms, optimize database queries and use built-in functions. 7</p>
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<a href="https://www.php.cn/faq/1796795664.html" title="PHP and Python: Comparing Two Popular Programming Languages" class="phphistorical_Version2_mids_img">
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<a href="https://www.php.cn/faq/1796795664.html" title="PHP and Python: Comparing Two Popular Programming Languages" class="phphistorical_Version2_mids_title">PHP and Python: Comparing Two Popular Programming Languages</a>
<span class="Articlelist_txts_time">Apr 14, 2025 am 12:13 AM</span>
<p class="Articlelist_txts_p">PHP and Python each have their own advantages, and choose according to project requirements. 1.PHP is suitable for web development, especially for rapid development and maintenance of websites. 2. Python is suitable for data science, machine learning and artificial intelligence, with concise syntax and suitable for beginners.</p>
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<a href="https://www.php.cn/faq/1796794185.html" title="PHP vs. Python: Understanding the Differences" class="phphistorical_Version2_mids_img">
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<a href="https://www.php.cn/faq/1796794185.html" title="PHP vs. Python: Understanding the Differences" class="phphistorical_Version2_mids_title">PHP vs. Python: Understanding the Differences</a>
<span class="Articlelist_txts_time">Apr 11, 2025 am 12:15 AM</span>
<p class="Articlelist_txts_p">PHP and Python each have their own advantages, and the choice should be based on project requirements. 1.PHP is suitable for web development, with simple syntax and high execution efficiency. 2. Python is suitable for data science and machine learning, with concise syntax and rich libraries.</p>
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<p class="Articlelist_txts_p">PHP is widely used in e-commerce, content management systems and API development. 1) E-commerce: used for shopping cart function and payment processing. 2) Content management system: used for dynamic content generation and user management. 3) API development: used for RESTful API development and API security. Through performance optimization and best practices, the efficiency and maintainability of PHP applications are improved.</p>
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<span class="Articlelist_txts_time">Apr 14, 2025 am 12:12 AM</span>
<p class="Articlelist_txts_p">PHP is still dynamic and still occupies an important position in the field of modern programming. 1) PHP's simplicity and powerful community support make it widely used in web development; 2) Its flexibility and stability make it outstanding in handling web forms, database operations and file processing; 3) PHP is constantly evolving and optimizing, suitable for beginners and experienced developers.</p>
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<a href="https://www.php.cn/faq/1796795224.html" title="PHP vs. Other Languages: A Comparison" class="phphistorical_Version2_mids_img">
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<span class="Articlelist_txts_time">Apr 13, 2025 am 12:19 AM</span>
<p class="Articlelist_txts_p">PHP is suitable for web development, especially in rapid development and processing dynamic content, but is not good at data science and enterprise-level applications. Compared with Python, PHP has more advantages in web development, but is not as good as Python in the field of data science; compared with Java, PHP performs worse in enterprise-level applications, but is more flexible in web development; compared with JavaScript, PHP is more concise in back-end development, but is not as good as JavaScript in front-end development.</p>
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<span class="Articlelist_txts_time">Apr 18, 2025 am 12:26 AM</span>
<p class="Articlelist_txts_p">PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.</p>
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<a href="https://www.php.cn/faq/1796796229.html" title="PHP and Python: Code Examples and Comparison" class="phphistorical_Version2_mids_img">
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<a href="https://www.php.cn/faq/1796796229.html" title="PHP and Python: Code Examples and Comparison" class="phphistorical_Version2_mids_title">PHP and Python: Code Examples and Comparison</a>
<span class="Articlelist_txts_time">Apr 15, 2025 am 12:07 AM</span>
<p class="Articlelist_txts_p">PHP and Python have their own advantages and disadvantages, and the choice depends on project needs and personal preferences. 1.PHP is suitable for rapid development and maintenance of large-scale web applications. 2. Python dominates the field of data science and machine learning.</p>
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