React表單

weixin_33840661發表於2017-07-24

React表單

首先,我們需要搭建一個React環境,用來實現效果:

  1. 先安裝React,這裡我用的並不是最新版本的,所以需要選擇一個版本:

jspm install react@0.14.0-rcl
  1. 安裝完成後,接著安裝一個react-dom:

jspm install react-dom@0.14.0-rcl
  1. semantic-ui,這個外掛並不是react必裝的,這只是一個樣式外掛,裝不裝都可以,但是我這裡圖個方便就裝上了:

jspm install semantic-ui
  1. 在這裡直接把semantic引入,所以需要安裝一個css外掛:

jspm install css
  1. 然後用browser-sync建立一個伺服器,用來監視一些檔案的變化:

browser-sync start --server --no-notify --files 'index.html. app/**/*.js' 
  • 這裡我用了一個System來匯入app底下的mian.js:
    圖片描述

  • 開啟main.js,在裡面把css樣式引進來:

"use strict";


import 'semantic-ui/semantic.min.js!';
  • 下面是一個簡單的排版,來看一下css樣式:

<div class="ui container" style="padding:30px">
            <div id="app"></div>
</div>
下面我們就開始正式的編寫程式了:

建立一個comment檔案,在檔案下面建立一個CommentBox.js:

'use strice';


import React from 'react';  //匯入react;
class CommentBox extends React.Component{
    constructor(props){
        spuer(props);
        this.state = {data:[]};
        this.getComments();
       // setInterval(() => this.getComments(),5000);
    }


    handleCommentSubmit(comment){
        let comments = this.state.data,
         newComments = comments.concat(comment);


        this.setState({data:newComments});
    }


    getComments(){
        $.ajax({
            url:this.props.url,
            dataType:'json',
            cache:false,
            success:comments => {
                this.set({data:comments});
            },
            error:(xhr,status,error) => {
                console.log(error);
            }
        });
    }
    render(){
        return (
            <div className = "ui comments">
                <h1>評論</h1>
                <div className = "ui divider"></div>
                <CommentList data={this.states.data}/>
                <CommentForm onCommentSumit = {this.handleCommentSubmit.bind(this)}/>
            </div>
        );
    }
}
export{CommentBox as default}; //作為一個預設的東西匯出;

在網頁中顯示頁面需要在main.js裡面匯入一些檔案:

- html:
<div class="ui container" style="padding:30px">
    <div id="app"></div>
</div>
<script src="jspm_packages/system.js"></script>
<script src="config.js"></script>
<script>
    System.impore('app/main');
</script>


- main.js:
'use strict'
import 'semantic-ui/semantic.min.css!';
import React from 'react';
import ReactDOM from 'react-dom';
import CommentBox from './comment/CommentBox';


ReactDOM.render(
    <CommentBox url="comments.json" />,
    document.getElementById("app")
);

接下來我們需要在定義兩個元件,來把它們連在一起:

  • 評論列表的元件(CommentList.js):

'use strict';


import React from 'react';
import Comment from './Comment';


class CommentList extends React.Component{
    render(){
        let commentNodes = this.props.data.map(comment => {
            return(
                <Comment author={comment.author} data={comment.data}>
                    {comment.text}
                </Comment>
            );
        })
        return(
            <div>
                {commentNodes}
            </div>
        );
    }
}


export {CommentList as default};
  • 評論表單的元件(CommentForm.js):

'use strict';


import React from 'react';


class CommentForm extends React.Component{
    handleSubmit(event){
        event.preventDefult();
        console.log("提交表單。。。。");
        let author = this.refs.author.value,
              text = this.refs.txte.value;


              console.log(author,text);
              this.props.onCommentSubmit({author,text,date:"剛剛"});
    }
    render(){
        return(
            <from className = "ui reply form" onSubmit = {this.handleSubmit.bind(this)}>
                <div className="field">
                    <input type="text" placeholder="姓名" ref="author"/>
                </div>
                <div className="field">
                    <textarea placeholder="評論" ref="text"></textarea>
                </div>
                <button type="submit" className="ui blue button">
                    新增評論
                </button>
            </from>
        );
    }
}


export {CommentForm as default};

然後定義一個Cmment.js的一個元件,放到CommentList.js裡面,然後在從CommentList.js裡面傳遞一些資料到Cmment.js裡面:

  • Cmment.js:

'use strict'


import React from 'react';


class Comment extends React.Comment{
    render (){
        return (
            <div className="comment">
                <div className="content">
                    <span className="author">{this.props.author}</span>
                    <div className="metadata">
                        <span className="date">{this.props.date}</span>
                    </div>
                    <div className="text">{this.props.children}</div>
                </div>
            </div>
        );
    }
}
export {Comment as default};
  • CommentList.js:

'use strict';


import React from 'react';
import Comment from './Comment';  //引進Comment.js;


class CommentList extends React.Component{
    render(){
        let commentNodes = this.props.data.map(comment => {
            return(
                <Comment author={comment.author} data={comment.data}>
                    {comment.text}
                </Comment>
            );
        })
        return(
            <div>
                {commentNodes}
            </div>
        );
    }
}


export {CommentList as default};

註釋:這事瀏覽器會顯示一些內容,這些內容就是從render這個方法裡面傳遞給CommentBox.js這個元件,然後再從CommentBox.js傳遞給CommentList.js,在CommentList.js這個元件裡面迴圈的處理了一下每一條評論的內容,每一次都會用一次Comment這個元件,然後把評論的內容傳遞給Comment;

從服務端請求資料:

  • 建立一個Comments.json檔案:

[
    {"author":"姜姜","date":"5 分鐘前","text":"天氣不錯啊!!!"},
    {"author":"筱妍","date":"3 分鐘前","text":"出去玩啊!!!"},
    {"author":"吳建","date":"1 分鐘前","text":"去哪玩啊!!!"}
]

從服務端請求資料:

$.ajax({
    url:this.props.url,
    dataType:'json',
    cache:false,
    success:comments => {
         this.set({data:comments});
    },
    error:(xhr,status,error) => {
        console.log(error);
    }
});

為了頁面的資料和服務端的保持聯絡,設定每隔五秒向服務端發生一次請求:

constructor(props){
        spuer(props);
        this.state = {data:[]};
        this.getComments();
        setInterval(() => this.getComments(),5000);
    }
getComments(){
        $.ajax({
            url:this.props.url,
            dataType:'json',
            cache:false,
            success:comments => {
                this.set({data:comments});
            },
            error:(xhr,status,error) => {
                console.log(error);
            }
        });
    }

在CommentForm.js幫頂一下事件:

class CommentForm extends React.Component{
    handleSubmit(event){
        event.preventDefult();
        console.log("提交表單。。。。");
        let author = this.refs.author.value,
              text = this.refs.txte.value;


              console.log(author,text);
              this.props.onCommentSubmit({author,text,date:"剛剛"});
    }
    render(){
        return(
            <from className = "ui reply form" onSubmit = {this.handleSubmit.bind(this)}>
                <div className="field">
                    <input type="text" placeholder="姓名" ref="author"/>
                </div>
                <div className="field">
                    <textarea placeholder="評論" ref="text"></textarea>
                </div>
                <button type="submit" className="ui blue button">
                    新增評論
                </button>
            </from>
        );
    }
}

接下來我們可以把寫的內容輸出到控制檯上:

把提交的內容交給服務端處理:

  • 在CommentBox.js上面新增一個方法:

handleCommentSubmit(comment){
        let comments = this.state.data,
         newComments = comments.concat(comment);


        this.setState({data:newComments});
    }
//這個方法就是告訴CommentBox.js,有人提交資料,就把這條資料放在這個方法裡面執行一次;

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