如何通过 AJAX 请求 PHP 文件来更改文本值?

我正在学习 AJAX,并且想要创建一个非常简单的 Web 应用程序来在“现实世界”中使用我的知识。


我正在尝试计算用户输入值的不同百分比,并使其显示在网页上,而无需刷新,这要归功于 AJAX。


这是我的 HTML 表单:


<form id="warmupForm" class="form">

      <label for="userWorkLoad">Work load (in kgs)</label><br>

      <input type="text" name="userWorkLoad" id="userWorkLoad">

      <button type="submit">Calculate</button>

    </form> 


<div id="#output">This is where I want the result to be shown with AJAX</div>

这是我的一些 PHP 代码,供您了解:


# Get the user input (work load in kgs)

if (isset($_POST['userWorkLoad'])) {

    $workload = $_POST['userWorkLoad'];


    # Avoid JS hacking

    $workload = htmlspecialchars($workload);

}


# CALCULATION #

# Calculate 55% of the work load (1st warm up set)

$FirstWarmupSet = ($workload * 0.55);


# Calculate 70% of the work load (2nd warm up set)

$SecondWarmupSet = ($workload * 0.7);


# First Warmup set #

echo "<li>Do 8 reps with " . $FirstWarmupSet . " kgs, then take 1 minute rest.</li>";

echo "<br>";


# Second Warmup set #

echo "<li>Do 5 reps with " . $SecondWarmupSet . " kgs, then take 1 minute rest.</li>";

echo "<br>";

// etc etc...

我希望当用户单击提交按钮时,PHP 中的不同变量值显示在我的“#output”div 中。


我尝试了很多不同的东西(没有 jQuery 的 AJAX、带有 jQuery 的 AJAX),但没有得到我想要的。


我确信我做错了什么,但我不知道是什么。我确信我的 PHP 脚本可以正常工作,因为我在没有 AJAX 的情况下使用它,没有任何问题。


如果有人能在这方面帮助我,我将非常感激。


料青山看我应如是
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2回答

30秒到达战场

如上所述,发出 AJAX 请求的最简单方法可能是尝试 jQuery:<!doctype html><html>&nbsp; &nbsp; <head>&nbsp; &nbsp; &nbsp; &nbsp; <meta charset="utf-8">&nbsp; &nbsp; &nbsp; &nbsp; <!-- Add jQuery on your HTML page -->&nbsp; &nbsp; &nbsp; &nbsp; <script src="https://code.jquery.com/jquery-3.5.1.min.js"></script>&nbsp; &nbsp; &nbsp; &nbsp; <!-- Add some custom JavaScript file -->&nbsp; &nbsp; &nbsp; &nbsp; <script type="text/javascript" src="script.js"></script>&nbsp; &nbsp; </head>&nbsp; &nbsp; <body>&nbsp; &nbsp; &nbsp; &nbsp; <form id="warmupForm" class="form">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <label for="userWorkLoad">Work load (in kgs)</label><br>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <input type="text" name="userWorkLoad" id="userWorkLoad">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <button id="btn" type="submit">Calculate</button>&nbsp; &nbsp; &nbsp; &nbsp; </form>&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; <div id="output">This is where I want the result to be shown with AJAX</div>&nbsp; &nbsp; </body></html>内容script.js:$(function() {&nbsp; &nbsp; // Process a button click&nbsp; &nbsp; $("#btn").click(function() {&nbsp; &nbsp; &nbsp; &nbsp; event.preventDefault();&nbsp; &nbsp; &nbsp; &nbsp; // Get input field&nbsp; &nbsp; &nbsp; &nbsp; var userWorkLoadInput = $("#userWorkLoad");&nbsp; &nbsp; &nbsp; &nbsp; // Build some request parameters&nbsp; &nbsp; &nbsp; &nbsp; var params = {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; userWorkLoad: userWorkLoadInput.val()&nbsp; &nbsp; &nbsp; &nbsp; };&nbsp; &nbsp; &nbsp; &nbsp; // Let's name your PHP script file as "server.php"&nbsp; &nbsp; &nbsp; &nbsp; // And send POST request with those parameters&nbsp; &nbsp; &nbsp; &nbsp; $.post("server.php", params, function(response) {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; // Response text we're going to put into the `output`&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; $("#output").html(response);&nbsp; &nbsp; &nbsp; &nbsp; });&nbsp; &nbsp; });});

万千封印

您可以简单地使用 Jquery 而不是使用 Ajax 来完成此操作(使用 PHP,您应该将 method="POST" 添加到表单中)。这是一个例子:$(document).ready(function(){ $("#send").click(function(){//&nbsp;your&nbsp;calculates$("#output").html(...); }); }); ... <button&nbsp;type="submit"&nbsp;id="send">Calculate</button>
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