I am working on a project which is basically notepad. I am having problems though updating the \'s value when an ajax call is made. I tried setting the textarea\ <script async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script> <ins class="adsbygoogle" style="display:block" data-ad-client="ca-pub-5408099190056760" data-ad-slot="7305827575" data-ad-format="auto" data-full-width-responsive="true"></ins> <script> (adsbygoogle = window.adsbygoogle || []).push({}); </script> </div> <div class="relativetags"> 相关标签: </div> </div> <div class="fly-panel detail-box" id="flyReply"> <fieldset class="layui-elem-field layui-field-title" style="text-align: center;"> <legend>2条回答</legend> </fieldset> <ul class="jieda" id="jieda"> <li data-id="111"> <a name="item-1111111111"></a> <div class="detail-about detail-about-reply"> <a class="fly-avatar" href="https://www.e-learn.cn/qa/u-24.html"> <img src="https://www.e-learn.cn/qa/data/avatar/000/00/00/small_000000024.jpg" alt=" "> </a> <div class="fly-detail-user"> <a href="https://www.e-learn.cn/qa/u-24.html" class="fly-link"> <cite>臣服心动 </cite> </a> </div> <div class="detail-hits"> <span>2021-02-02 06:10</span> </div> </div> <div class="detail-body jieda-body photos"> <p>I think you want something along the line of:</p> <p>Parent:</p> <pre><code><Editor name={this.state.fileData} /> </code></pre> <p>Editor:</p> <pre><code>var Editor = React.createClass({ displayName: 'Editor', propTypes: { name: React.PropTypes.string.isRequired }, getInitialState: function() { return { value: this.props.name }; }, handleChange: function(event) { this.setState({value: event.target.value}); }, render: function() { return ( <form id="noter-save-form" method="POST"> <textarea id="noter-text-area" name="textarea" value={this.state.value} onChange={this.handleChange} /> <input type="submit" value="Save" /> </form> ); } }); </code></pre> <p>This is basically a direct copy of the example provided on https://facebook.github.io/react/docs/forms.html</p> <p><strong>Update for React 16.8:</strong></p> <pre><code>import React, { useState } from 'react'; const Editor = (props) => { const [value, setValue] = useState(props.name); const handleChange = (event) => { setValue(event.target.value); }; return ( <form id="noter-save-form" method="POST"> <textarea id="noter-text-area" name="textarea" value={value} onChange={handleChange} /> <input type="submit" value="Save" /> </form> ); } Editor.propTypes = { name: PropTypes.string.isRequired }; </code></pre> <div class="appendcontent"> </div> </div> <div class="jieda-reply"> <span class="jieda-zan button_agree" type="zan" data-id='2018180'> <i class="iconfont icon-zan"></i> <em>0</em> </span> <span type="reply" class="showpinglun" data-id="2018180"> <i class="iconfont icon-svgmoban53"></i> 讨论(0) </span> <div class="jieda-admin"> </div> </div> <div class="comments-mod " style="display: none; float:none;padding-top:10px;" id="comment_2018180"> <div class="areabox clearfix"> <form class="layui-form" action=""> <div class="layui-form-item"> <label class="layui-form-label" style="padding-left:0px;width:60px;">发布评论:</label> <div class="layui-input-block" style="margin-left:90px;"> <input type="text" placeholder="不少于5个字" AUTOCOMPLETE="off" class="comment-input layui-input" name="content" /> <input type='hidden' value='0' name='replyauthor' /> </div> <div class="mar-t10"><span class="fr layui-btn layui-btn-sm addhuidapinglun" data-id="2018180">提交评论 </span></div> </div> </form> </div> <hr> <ul class="my-comments-list nav"> <li class="loading"> <img src='https://www.e-learn.cn/qa/static/css/default/loading.gif' align='absmiddle' /> 加载中... </li> </ul> </div> </li> <li data-id="111"> <a name="item-1111111111"></a> <div class="detail-about detail-about-reply"> <a class="fly-avatar" href="https://www.e-learn.cn/qa/u-22.html"> <img src="https://www.e-learn.cn/qa/data/avatar/000/00/00/small_000000022.jpg" alt=" "> </a> <div class="fly-detail-user"> <a href="https://www.e-learn.cn/qa/u-22.html" class="fly-link"> <cite>误落风尘 </cite> </a> </div> <div class="detail-hits"> <span>2021-02-02 06:25</span> </div> </div> <div class="detail-body jieda-body photos"> <p>As a newbie in React world, I came across a similar issues where I <code>could not edit</code> the textarea and <code>struggled</code> with binding. It's worth knowing about <code>controlled</code> and <code>uncontrolled</code> elements when it comes to react. </p> <p>The value of the following <code>uncontrolled textarea</code> cannot be changed because of <code>value</code> </p> <pre><code> <textarea type="text" value="some value" onChange={(event) => this.handleOnChange(event)}></textarea> </code></pre> <p>The value of the following <code>uncontrolled textarea</code> can be changed because of use of <code>defaultValue</code> or <code>no value attribute</code></p> <pre><code><textarea type="text" defaultValue="sample" onChange={(event) => this.handleOnChange(event)}></textarea> <textarea type="text" onChange={(event) => this.handleOnChange(event)}></textarea> </code></pre> <p>The value of the following <code>controlled textarea</code> can be changed because of how value is mapped to a state as well as the <code>onChange</code> event listener</p> <pre><code><textarea value={this.state.textareaValue} onChange={(event) => this.handleOnChange(event)}></textarea> </code></pre> <p>Here is my solution using different syntax. I prefer the <code>auto-bind</code> than manual binding however, if I were to not use <code>{(event) => this.onXXXX(event)}</code> then that would cause the content of <code>textarea</code> to be not editable OR the <code>event.preventDefault()</code> does not work as expected. Still a lot to learn I suppose.</p> <pre><code>class Editor extends React.Component { constructor(props) { super(props) this.state = { textareaValue: '' } } handleOnChange(event) { this.setState({ textareaValue: event.target.value }) } handleOnSubmit(event) { event.preventDefault(); this.setState({ textareaValue: this.state.textareaValue + ' [Saved on ' + (new Date()).toLocaleString() + ']' }) } render() { return <div> <form onSubmit={(event) => this.handleOnSubmit(event)}> <textarea rows={10} cols={30} value={this.state.textareaValue} onChange={(event) => this.handleOnChange(event)}></textarea> <br/> <input type="submit" value="Save"/> </form> </div> } } ReactDOM.render(<Editor />, document.getElementById("content")); </code></pre> <p>The versions of libraries are </p> <pre><code>"babel-cli": "6.24.1", "babel-preset-react": "6.24.1" "React & ReactDOM v15.5.4" </code></pre> <div class="appendcontent"> </div> </div> <div class="jieda-reply"> <span class="jieda-zan button_agree" type="zan" data-id='2018181'> <i class="iconfont icon-zan"></i> <em>0</em> </span> <span type="reply" class="showpinglun" data-id="2018181"> <i class="iconfont icon-svgmoban53"></i> 讨论(0) </span> <div class="jieda-admin"> </div> </div> <div class="comments-mod " style="display: none; float:none;padding-top:10px;" id="comment_2018181"> <div class="areabox clearfix"> <form class="layui-form" action=""> <div class="layui-form-item"> <label class="layui-form-label" style="padding-left:0px;width:60px;">发布评论:</label> <div class="layui-input-block" style="margin-left:90px;"> <input type="text" placeholder="不少于5个字" AUTOCOMPLETE="off" class="comment-input layui-input" name="content" /> <input type='hidden' value='0' name='replyauthor' /> </div> <div class="mar-t10"><span class="fr layui-btn layui-btn-sm addhuidapinglun" data-id="2018181">提交评论 </span></div> </div> </form> </div> <hr> <ul class="my-comments-list nav"> <li class="loading"> <img src='https://www.e-learn.cn/qa/static/css/default/loading.gif' align='absmiddle' /> 加载中... </li> </ul> </div> </li> <style> .laypage-main a, .laypage-main span { display: inline-block; } </style> </ul> <div class="layui-form layui-form-pane"> <form id="huidaform" name="answerForm" method="post"> <div class="layui-form-item layui-form-text"> <a name="comment"></a> <div class="layui-input-block"> <script type="text/javascript" src="https://www.e-learn.cn/qa/static/js/neweditor/ueditor.config.js"></script> <script type="text/javascript" src="https://www.e-learn.cn/qa/static/js/neweditor/ueditor.all.js"></script> <script type="text/plain" id="editor" name="content" style="width:100%;height:200px;"></script> <script type="text/javascript"> var isueditor=1; var editor = UE.getEditor('editor',{ //这里可以选择自己需要的工具按钮名称,此处仅选择如下五个 toolbars:[['source','fullscreen', '|', 'undo', 'redo', '|', 'bold', 'italic', 'underline', 'fontborder', 'strikethrough', 'removeformat', 'formatmatch', 'autotypeset', 'blockquote', 'pasteplain', '|', 'forecolor', 'backcolor', 'insertorderedlist', 'insertunorderedlist', 'selectall', 'cleardoc', '|', 'rowspacingtop', 'rowspacingbottom', 'lineheight', '|', 'customstyle', 'paragraph', 'fontfamily', 'fontsize', '|', 'indent', '|', 'justifyleft', 'justifycenter', 'justifyright', 'justifyjustify', '|', 'link', 'unlink', 'anchor', '|', 'simpleupload', 'insertimage', 'scrawl', 'insertvideo', 'attachment', 'map', 'insertcode', '|', 'horizontal', '|', 'preview', 'searchreplace', 'drafts']], initialContent:'', //关闭字数统计 wordCount:false, zIndex:2, //关闭elementPath elementPathEnabled:false, //默认的编辑区域高度 initialFrameHeight:250 //更多其他参数，请参考ueditor.config.js中的配置项 //更多其他参数，请参考ueditor.config.js中的配置项 }); editor.ready(function() { editor.setDisabled(); }); $("#editor").find("*").css("max-width","362px"); </script> </div> </div> <div class="layui-form-item"> <label for="L_vercode" class="layui-form-label">验证码</label> <div class="layui-input-inline"> <input type="text" id="code" name="code" value="" required lay-verify="required" placeholder="图片验证码" autocomplete="off" class="layui-input"> </div> <div class="layui-form-mid"> <span style="color: #c00;"><img class="hand" src="https://www.e-learn.cn/qa/user/code.html" onclick="javascript:updatecode();" id="verifycode"><a class="changecode" href="javascript:updatecode();"> 看不清?</a></span> </div> </div> <div class="layui-form-item"> <input type="hidden" value="985918" id="ans_qid" name="qid"> <input type="hidden" id="tokenkey" name="tokenkey" value=''/> <input type="hidden" value="React Modifying Textarea Values" id="ans_title" name="title"> <div class="layui-btn layui-btn-disabled" id="ajaxsubmitasnwer" >提交回复</div> </div> </form> </div> </div> <input type="hidden" value="985918" id="adopt_qid" name="qid" /> <input type="hidden" id="adopt_answer" value="0" name="aid" /> </div> <div class="layui-col-md4"> <!-- 热门讨论问题 --> <dl class="fly-panel fly-list-one"> <dt class="fly-panel-title">热议问题</dt> <!-- 本周热门讨论问题显示10条-->
