首页 > 解决方案 > 当用户更改值时定期发送 POST 请求</h1> <div id="body"><p>I created a form in which user puts some food names to the menu in textarea and then he/she can press button to submit this form and send a POST request. After submitting, all data fro</p> </div> <div class="container" id="article"> <div class="page-header"> <h1>javascript - 当用户更改值时定期发送 POST 请求<textarea></h1> <div id="body"><p>I created a form in which user puts some food names to the menu in textarea and then he/she can press button to submit this form and send a POST request. After submitting, all data fro</h1> </div> <div class="con"> <h3>问题描述</h3> <p class="author">标签： <span>javascript</span><span>html</span><span>node.js</span><span>database</span><span>mongodb</span></div> <h3>解决方案</h3> <hr> <div class="con "> <div class="body"> <p>自动保存表单组件使用<a href="https://www.w3schools.com/jsref/event_onchange.asp" rel="nofollow noreferrer"><code>onchange</code></a>(and/or <a href="https://www.w3schools.com/JSREF/event_onkeyup.asp" rel="nofollow noreferrer"><code>onkeyup</code></a>and/or <a href="https://www.w3schools.com/JSREF/event_onkeydown.asp" rel="nofollow noreferrer"><code>onkeydown</code></a>) 属性来注册事件并调用 save 方法。</p> <p>此外，还有触发很多请求的问题。这可以通过<a href="https://www.w3schools.com/jsref/met_win_cleartimeout.asp" rel="nofollow noreferrer"><code>setTimeout</code>and<code>clearTimeout</code></a>解决；</p> <p>代码看起来像这样（伪代码）：</p> <pre><code>//HTML <form method="POST" action="/" name="myForm"> <textarea name="textareaName_1" onchange="handleAutoSave"></textarea> <textarea name="textareaName_2" onchange="handleAutoSave"></textarea> ... </form> </code></pre> <pre><code>// JS var autoSaveProgress = null; function handleAutoSave() { var formData = new FormData(document.querySelector('[name]="myForm"')); // cancel last request if(autoSaveProgress){ autoSaveProgress(); autoSaveProgress = null; } autoSaveProgress = setTimeout(function() { saveToLocalstorage('KEY', formData); } ,1000); // 1s delay till commit } </code></pre> </div> <div class="clear"></div> </div> <hr> <h3>推荐阅读</h3> <ul> <li><a href="/question/61435689.html">c - 您可以在 C 中进行重载并具有相同的函数名吗？</a></li><li><a href="/question/61435690.html">php - 为什么 PHP Simple DOM 库不适用于 PHP 7.4.5？</a></li><li><a href="/question/61435699.html">sql - SQL - 将单元格/行输出附加到现有列名</a></li><li><a href="/question/61435704.html">php - 登录功能的 PHP 会话无法正常工作</a></li><li><a href="/question/61435721.html">java - 来自 Firebase 的 dataSnapshot.getValue(MyClass.class) 在开发中工作正常，但在发布到 Play 商店后得到空值</a></li><li><a href="/question/61435725.html">docker - 如何将字典和列表成员添加到键中？</a></li><li><a href="/question/61435726.html">excel - 检测新的 Excel 溢出模式并重置它</a></li><li><a href="/question/61435732.html">angular - 使用spring security的auth api调用的交叉错误</a></li><li><a href="/question/61435733.html">java - Java：浅拷贝（克隆）对我不起作用？</a></li><li><a href="/question/61435735.html">compiler-errors - 这个帕斯卡语法有什么问题？？ - 导致编译器错误</a></li> </ul> </div> <footer> <p><a href="/">时间戳在线转换</a></p> </footer> <script async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js?client=ca-pub-6117966252207595" crossorigin="anonymous"></script> <script> var _hmt = _hmt || []; (function() { var hm = document.createElement("script"); hm.src = "https://hm.baidu.com/hm.js?7145e10314e5e27e886ad54be2aeb067"; var s = document.getElementsByTagName("script")[0]; s.parentNode.insertBefore(hm, s); })(); </script> </body></html>