• Vue实战之CURD


    #hello world
    找到Vue创建的模板项目根目录的index.html
    --html

    <!DOCTYPE html>
    <html lang="en">
    <head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>demo1</title>
    <script src="https://cdn.bootcss.com/vue/2.4.1/vue.js"></script>
    </head>
    <body>
    <div id="app">
    {{message}}
    </div>
    <script>
    new Vue({
    el:'#app',
    data:{
    message:'hello world'
    }
    })
    </script>
    </body>
    </html>

    --启动本地服务

    npm run dev

    --在浏览器输入默认地址

    http://localhost:8080/

    --view

    hello world

    #ToDoList

    --html

    <div id="app">
    <form>
    <table style="300px;border-collapse:collapse" border="1">
    <tr>
    <th>title</th>
    <th>desc</th>
    </tr>
    <tr v-for="todoItem in todolist">
    <td>{{todoItem.title}}</td>
    <td>{{todoItem.desc}}</td>
    </tr>
    </table>
    <input type="text" v-model="title"><br>
    <input type="text" v-model="desc"><br/>
    <input type="button" value="add todoItem" v-on:click="addItem()"/>
    </form>
    </div>

    --

    v-model:实现双向数据绑定
    v-on:事件绑定指令,click是参数,可以缩写为@click
    --js

    var todoItem=function(title,desc){
    this.title=title;
    this.desc=desc;
    }
    new Vue({
    el:'#app',
    data:{
    todolist:[],
    titel:'',
    desc:''
    },
    methods:{
    addItem:function(){
    this.todolist.push(new todoItem(this.title,this.desc));
    this.title='';
    this.desc='';
    }
    }
    })

    --

    data:数据绑定
    methods:属性绑定,事件绑定的回调函数都代理在methods中

    刷新运行,在表单中输入后,点击add按钮,向数组添加元素同时刷新了列表
    要从数据驱动UI的方式来思考,接下来增加删除功能
    --html

    <td><input type="button" value="remove" @click="remove(index)"/></td>
    --js
    methods:{
    remove:function(index){
    this.todolist.splice(index,1);
    }
    }
    
    引入bootstrap美化页面
    --html
    <!DOCTYPE html>
    <html lang="en">
    <head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>demo1</title>
    <script src="https://cdn.bootcss.com/vue/2.4.1/vue.js"></script>
    <link href="https://cdn.bootcss.com/bootstrap/4.0.0-alpha.6/css/bootstrap.css" rel="stylesheet">
    </head>
    <body class="container">
    <div id="app" class='row'>
    <div class="col-md-6">
    <table class="table table-bordered">
    <tr>
    <th>title</th>
    <th>desc</th>
    <th></th>
    </tr>
    <tr v-for="(todoItem,index) in todolist">
    <td>{{todoItem.title}}</td>
    <td>{{todoItem.desc}}</td>
    <td><input type="button" value="remove" @click="remove(index)" class="btn btn-danger" /></td>
    </tr>
    </table>
    </div>
    <div class="col-md-6">
    
    <div class="form-inline">
    <label for="title" class="control-label col-md-4">title:</label>
    <input type="text" v-model="title" class="form-control col-md-8">
    </div>
    <div class="form-inline">
    <label for="desc" class="control-label col-md-4">desc</label>
    <input type="text" v-model="desc" class="form-control col-md-8">
    </div>
    <div class="form-inline">
    <input type="button" value="OK" v-on:click="addItem()" class="btn btn-primary offset-md-10" />
    </div>
    </div>
    </div>
    </body>

    --js

    <script>
    var TodoItem = function (title, desc) {
    this.title = title;
    this.desc = desc;
    }
    new Vue({
    el: '#app',
    data: {
    todolist: [],
    title: '',
    desc: ''
    },
    methods: {
    addItem: function () {
    this.todolist.push(new TodoItem(this.title, this.desc))
    
    this.title = this.desc = '';
    
    },
    remove: function (index) {
    this.todolist.splice(index, 1);
    }
    
    }
    })
    </script>

    刷新运行看下效果,接下来增加编辑按钮,先增加自增ID

    --html

    <div class="col-md-6">
    <table class="table table-bordered">
    <tr>
    <th></th>
    <th>title</th>
    <th>desc</th>
    <th></th>
    </tr>
    <tr v-for="(todoItem,index) in todolist">
    <th>{{todoItem.id}}</th>
    <td>{{todoItem.title}}</td>
    <td>{{todoItem.desc}}</td>
    <td><input type="button" value="remove" @click="remove(index)" class="btn btn-danger" /></td>
    </tr>
    </table>
    </div>
    <div class="col-md-6">
    <div class="form-inline">
    <label for="title" class="control-label col-md-4">title:</label>
    <input type="hidden" v-bind:value="todoItem.id" />
    <input type="text" v-model="todoItem.title" class="form-control col-md-8">
    </div>
    <div class="form-inline">
    <label for="desc" class="control-label col-md-4">desc</label>
    <input type="text" v-model="todoItem.desc" class="form-control col-md-8">
    </div>
    <div class="form-inline">
    <input type="button" value="OK" v-on:click="addItem()" class="btn btn-primary offset-md-10" />
    </div>
    </div>

    --js

    var todoItem=(function(){
    var id=1;
    return function(title,desc){
    this.title=title;
    this.desc=desc;
    this.id=id++;
    }
    })();
    
    data:{
    todolist:[],
    todoItem:{
    id:'',
    title:'',
    desc:''
    }
    }
    
    methods:{
    addItem:function(){
    this.todolist.push(
    new todoItem(
    this.todoItem.title,
    this.todoItem.desc
    )
    );
    this.dodoItem={};
    }
    }

    刷新看效果,接下来添加编辑按钮

    --html

    <input type="button" value="edit" @click="edit(todoItem.id)" class="btn btn-info"/>

    --js

    methods:{
    edit:function(id){
    var obj=this.todolist.filter(v=>v.id===id)[0];
    this.todoItem=obj;
    }
    }

    刷新运行,编辑后在没有点击OK按钮,表单中的变化已经体现在列表中

    原因是:this.todoItem=obj 这句代码是引用赋值,所以todoItem和obj指向的是同一个地址,对this.todoItem的修改会直接反应到obj上,修改代码
    --js

    var obj=this.todolist.filter(v=>v.id===id)[0];
    this.todoItem={
    id:obj.id,
    title:obj.title,
    desc:obj.desc
    };

    但是现在修改还是新增操作,需要修改OK按钮的事件绑定方式为save,通过id判断新增还是修改操作:

    --html

    <input type="button" value="OK" v-on:click="save()" class="btn btn-primary offset-md-10" />

    --js

    methods:{
    save:function(){
    if(this.todoItem.id){
    //编辑
    var obj=this.todolist.filter(v=>v.id===this.todoItem.id)[0];
    obj.title=this.todoItem.title;
    obj.desc=this.todoItem.desc;
    }else{
    //新增
    this.todolist.push(
    new totoItem(
    this.todoItem.title,
    this.todoItem.desc
    )
    );
    }
    //重置表单
    this.todoItem={};
    }
    }

    运行,已经完成了编辑功能

    v-bind:一般用来传递属性参数,后面跟 :attr
    我们试着添加disable属性,使OK按钮只有在title不为空的前提下可用
    --html

    <input type="button" value="OK" v-on:click="save()" class="btn btn-primary offset-md-10" :disabled='canSave'/>

    --js

    new Vue({
    computed:{
    canSave:function(){
    return !this.todoItem.title||!this.todoItem.desc;
    }
    }
    })
    
    save: function () {
    if (this.todoItem.id) {
    //编辑
    var obj = this.todolist.filter(v => v.id === this.todoItem.id)[0];
    obj.title = this.todoItem.title;
    obj.desc = this.todoItem.desc;
    } else {
    //新增
    this.todolist.push(
    new todoItem(
    this.todoItem.title,
    this.todoItem.desc
    )
    );
    }
    //重置表单
    this.todoItem = {title:'',desc:''};
    },

    增加查询功能

    --html

    <div class="row toolbar">
    <div class="col-md-8">
    keyword:
    <input type="text" v-model="keyword"/>
    <input type="button" @click="query()" value="search" />
    </div>
    </div>

    --js

    //全局变量,用于缓存所有数据
    var list=[];
    
    data:{
    todolist:[],
    todoItem:{
    id:'',
    title:'',
    desc:''
    },
    keyword:''
    }
    
    methods:{
    remove: function (index) {
    this.todolist.splice(index, 1);
    list=this.todolist;
    },
    edit: function (id) {
    var obj = this.todolist.filter(v => v.id === id)[0];
    this.todoItem = {
    id: obj.id,
    title: obj.title,
    desc: obj.desc
    };
    },
    save: function () {
    if (this.todoItem.id) {
    //编辑
    var obj = this.todolist.filter(v => v.id === this.todoItem.id)[0];
    obj.title = this.todoItem.title;
    obj.desc = this.todoItem.desc;
    } else {
    //新增
    this.todolist.push(
    new todoItem(
    this.todoItem.title,
    this.todoItem.desc
    )
    );
    }
    //重置表单
    this.todoItem = {title:'',desc:''};
    list=this.todolist;
    },
    query: function () {
    //这里需要list全局变量过滤,而不能通过this.todolist,因为需要给this.todolist赋值,赋值后无法还原原来的列表
    this.todolist = list.filter(v => v.title.indexOf(this.keyword) !== -1);
    }
    }

    增删改查完成,完整代码

    -html

    <!DOCTYPE html>
    <html lang="en">
    
    <head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>demo1</title>
    <script src="https://cdn.bootcss.com/vue/2.4.1/vue.js"></script>
    <link href="https://cdn.bootcss.com/bootstrap/4.0.0-alpha.6/css/bootstrap.css" rel="stylesheet">
    
    </head>
    
    <body class="container">
    <div id="app">
    <div class="row toolbar">
    <div class="col-md-8">
    keyword:
    <input type="text" v-model="keyword" />
    <input type="button" @click="query()" value="search" />
    </div>
    </div>
    <div class='row'>
    
    <div class="col-md-6">
    <table class="table table-bordered">
    <tr>
    <th></th>
    <th>title</th>
    <th>desc</th>
    <th></th>
    </tr>
    <tr v-for="(todoItem,index) in todolist">
    <th>{{todoItem.id}}</th>
    <td>{{todoItem.title}}</td>
    <td>{{todoItem.desc}}</td>
    <td>
    <input type="button" value="remove" @click="remove(index)" class="btn btn-danger" />
    <input type="button" value="edit" @click="edit(todoItem.id)" class="btn btn-info" />
    </td>
    </tr>
    </table>
    </div>
    <div class="col-md-6">
    
    <div class="form-inline">
    <label for="title" class="control-label col-md-4">title:</label>
    <input type="hidden" v-bind:value="todoItem.id" />
    <input type="text" v-model="todoItem.title" class="form-control col-md-8">
    </div>
    <div class="form-inline">
    <label for="desc" class="control-label col-md-4">desc</label>
    <input type="text" v-model="todoItem.desc" class="form-control col-md-8">
    </div>
    <div class="form-inline">
    <input type="button" value="OK" v-on:click="save()" class="btn btn-primary offset-md-10" :disabled='canSave' />
    </div>
    </div>
    
    
    </div>
    </div>
    <script>
    var list = [];
    var TodoItem = (function () {
    var id = 1;
    return function (title, desc) {
    this.title = title;
    this.desc = desc;
    
    this.id = id++;
    }
    })();
    new Vue({
    el: '#app',
    data: {
    todolist: [],
    todoItem: {
    id: '',
    title: '',
    desc: ''
    },
    keyword: ''
    }, computed: {
    canSave: function () {
    return !this.todoItem.title || !this.todoItem.desc;
    }
    },
    methods: {
    query: function () {
    //过滤title中不包含keyword的数据
    //这里必须通过list全局变量过滤,而不能通过this.todolist,因为需要给this.todolist赋值,赋值后无法还原原来的列表。
    this.todolist = list.filter(v => v.title.indexOf(this.keyword) !== -1);
    },
    edit: function (id) {
    //找到id值等于所传参数的todoitem
    var obj = this.todolist.filter(v => v.id === id)[0];
    //对数据进行绑定,则数据会响应到表单上
    this.todoItem = {
    id: obj.id,
    title: obj.title,
    desc: obj.desc
    };
    },
    save: function () {
    if (this.todoItem.id) {
    //编辑保存
    var obj = this.todolist.filter(v => v.id === this.todoItem.id)[0];
    obj.title = this.todoItem.title;
    obj.desc = this.todoItem.desc;
    
    } else {
    //新增保存
    this.todolist.push(
    new TodoItem(
    this.todoItem.title,
    this.todoItem.desc
    )
    );
    }
    //重置表单
    this.todoItem = { title: '', desc: '' };
    
    list = this.todolist;
    },
    
    remove: function (index) {
    this.todolist.splice(index, 1);
    }
    
    }
    })
    </script>
    </body>
    
    </html>

     由于是用txt记录的没有截图,但是代码都是经过验证的~

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  • 原文地址:https://www.cnblogs.com/justinxhan/p/14744939.html
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