React之React.cloneElement

 

如果把一个页面分为多个组件组成的话(组件多层嵌套)，

想要在Panel和Calendar之间传值就不能用以往的props属性了。

解决方法：

Panel.js

        return (
            <Form.Root className={`bg-white ${type === 'reading' ? 'reading-min-height' : ''}`}>
                <div className="panel-title">
                    <h4 className="webfont">
                        <span className={"topTitle"}>{this.props.title}</span>
                    </h4>
                    {type === "reading" ? <a className="rightFont" onClick={() => this.onOpenTabs()}>更多></a> : ""}

                    {workDay ?
                        <Popover placement="bottom" content={
                            <div style={{display: 'flex', flexDirection: 'column', justifyContent: 'center'}}>
                                <Button type="primary" onClick={() => this.showMadel('2')}
                                        style={{marginBottom: 10}}>便笺</Button>
                                <Button type="primary" onClick={() => this.showMadel('1')}>日程</Button>
                            </div>
                        }
                                 title="">
                            <a className="more">
                                <i className="iconfont iconxinzengricheng mr-1"/>新建
                            </a>
                        </Popover>
                        : ""}
                    <Modal
                        width={window.innerWidth * 0.7}
                        style={{
                            top: 30
                        }}
                        title=""
                        visible={visible}
                        onOk={this.handleOk}
                        // confirmLoading={confirmLoading}
                        okText='ok'
                        footer={null}
                        onCancel={this.handleCancel}
                    >
                        <div id="pannelDialog">
                            {CreateTitle(title)}
                            {createInput()}
                            <div>

                                <div className="input-group mt-3 mb-3">
                                    <div className="input-group-prepend">
                                        <div>{types === 'view' ? attachments.length > 0 ? '查看图片：' : '' : '上传图片：'}</div>
                                    </div>
                                </div>

                                {types === 'view' ? attachments.length > 0 ?
                                    <ImageUploader width={80} height={80} attachments={attachments} types={types}
                                                   pushAttachments={this.pushAttachments}
                                                   removeAttachments={this.removeAttachments}/> : '' :
                                    <ImageUploader width={80} height={80} attachments={attachments} types={types}
                                                   pushAttachments={this.pushAttachments}
                                                   removeAttachments={this.removeAttachments}/>}
                            </div>
                            {CreateButton(this.submit, this.hideMadel, types)}
                        </div>
                    </Modal>
                </div>
                {this.props.children && React.cloneElement(this.props.children, {
                    handleClick: this.postValue,
                    onRef: this.onRef,
                })}
            </Form.Root>
        );

 

 

使用React.cloneElement(this.props)来渲染子元素，使用第二个参数props来传值