调查问卷WebApp
1. 效果演示
2. 主要知识点
- 使用slot分发内容
- 动态组件
- 组件通信
- 实例的生命周期
- 表单
3. 遇到的问题
bus 通信 第一次 $on 监听不到
// 解决bus 第一次通信 $on 监听不到
this.$nextTick(function () {
if (_this.totalSize - 1 == _this.order) {
bus.$emit('submiteDisabled', disabledStatus)
} else {
bus.$emit('nextStepDisabled', disabledStatus)
}
})
bus 通信 $on 多次触发
// bus传值之后要进行销毁， 尤其是跳转页面进行使用的时候
beforeDestroy() {
if (this.totalSize - 1 == this.order) {
bus.$off('submiteDisabled')
} else {
bus.$off('nextStepDisabled')
}
},
4. 代码整理
HTML
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>答题卡</title>
<link rel="stylesheet" href="./css/style.css">
</head>
<body>
<div id="app">
<main-component v-for="(question, index) in questions" :key="index" :title="question.title" :order="index"
v-if="index === currentOrder" :content="question.chooses">
<template slot="title" slot-scope="props">
<span>{{props.order}}. {{props.title}}</span>
</template>
<template slot="content" slot-scope="props">
<component :is="props.type"
:datas="question.chooses.values"
:selected = "question.chooses.selected"
:order = "index"
:total-size = "questions.length"
v-if="props.type != ''"></component>
<textarea-component :value="question.chooses.value"
:order="index"
:total-size = "questions.length" v-else></textarea-component>
</template>
<template slot="functionalDomain">
<button-component :now-order = "currentOrder"
:total-elements = "questions.length"
:next-step-disabled = "true"
></button-component>
</template>
</main-component>
</div>
<script src="./js/vue.js"></script>
<script src="./js/index.js"></script>
</body>
</html>
JS
var bus = new Vue();
Vue.component('main-component', {
props: {
order: Number,
title: String,
content: {
type: Object
}
},
template: '<div class="main">\
<div class="title">\
<slot name="title" :title="mytitle" :order="myorder + 1"></slot>\
</div>\
<div class="content">\
<slot name="content" :type="typeSelect"></slot>\
</div>\
<div class="footer">\
<slot name="functionalDomain" ></slot>\
</div>\
</div>',
data: function () {
return {
mytitle: this.title,
myorder: this.order
}
},
computed: {
typeSelect: function () {
let type_co = this.content.type;
if ('radio' == type_co || 'checkbox' == type_co) {
return type_co + '-component';
}else{
return '';
}
}
},
});
Vue.component('radio-component', {
props:{
selected: String,
datas:Array,
order: Number,
totalSize: Number },
template: '<div>\
<label v-for="(item, index) in mydatas" :key="index"><input type="radio" :value="item.value" v-model="results" />{{item.name}}</label>\
</div>',
data:function (){
return {
results: this.selected,
mydatas: this.datas
}
},
methods: {
updatNextStepStatus: function (val) { let disabledStatus = true;
let _this = this;
if (val != '') {
disabledStatus = false;
}
// 解决bus 第一次通信 $on 监听不到
this.$nextTick(function () {
if (_this.totalSize - 1 == _this.order) {
bus.$emit('submiteDisabled', disabledStatus)
} else {
bus.$emit('nextStepDisabled', disabledStatus)
} }) }
},
watch: {
results: function (val) {
this.updatNextStepStatus(val);
bus.$emit('valueChange', this.order, val)
},
selected: function (val) {
this.results = val
}
},
mounted() {
this.updatNextStepStatus(this.results);
},
beforeDestroy() {
if (this.totalSize - 1 == this.order) {
bus.$off('submiteDisabled')
} else {
bus.$off('nextStepDisabled')
}
},
});
Vue.component('checkbox-component', {
props: {
selected: Array,
datas: Array,
order: Number,
totalSize: Number
},
template: '<div>\
<label v-for="(item, index) in mydatas" :key="index"><input type="checkbox" :value="item.value" v-model="results" />{{item.name}}</label>\
</div>',
data: function () {
return {
results: this.selected,
mydatas: this.datas
}
},
methods: {
updatNextStepStatus: function (newValue, oldValue) {
let disabledStatus = true;
let _this = this;
if (oldValue.length < 2 && newValue.length < 2) {
return;
} else if (oldValue.length >= 2 && newValue.length < 2) {
disabledStatus = true;
} else if (newValue.length >= 3){
alert("多选，最多选择3个选项")
}else{
disabledStatus = false;
}
// 解决bus 第一次通信 $on 监听不到
this.$nextTick(function () {
if (_this.totalSize - 1 == _this.order) {
bus.$emit('submiteDisabled', disabledStatus)
} else {
bus.$emit('nextStepDisabled', disabledStatus)
} })
}
},
watch: {
results: function (newValue, oldValue) {
this.updatNextStepStatus(newValue, oldValue);
bus.$emit('valueChange', this.order, newValue)
},
selected: function (val) {
this.results = val
}
},
mounted() {
this.updatNextStepStatus(this.results,[]);
},
beforeDestroy() {
if (this.totalSize - 1 == this.order) {
bus.$off('submiteDisabled')
} else {
bus.$off('nextStepDisabled')
}
},
});
Vue.component('textarea-component', {
props: {
value: String,
order: Number,
totalSize: Number
},
template: '<textarea v-model="results" placeholder="不少于100字"></textarea>',
data: function () {
return {
results: this.value,
}
},
methods: {
updatNextStepStatus: function (newValue, oldValue) { let disabledStatus = true;
let _this = this;
if (newValue.length > 0 && newValue.length <= 5) {
disabledStatus = false;
}else{
disabledStatus = true;
}
// 解决bus 第一次通信 $on 监听不到
this.$nextTick(function () {
if (_this.totalSize - 1 == _this.order) {
bus.$emit('submiteDisabled', disabledStatus)
}else{
bus.$emit('nextStepDisabled', disabledStatus)
} }) }
},
watch: {
results: function (newValue, oldValue) {
this.updatNextStepStatus(newValue, '');
bus.$emit('valueChange', this.order, newValue)
},
value: function (val) {
this.results = val
}
},
mounted() {
this.updatNextStepStatus(this.results, '');
},
beforeDestroy() {
if (this.totalSize - 1 == this.order) {
bus.$off('submiteDisabled')
}else{
bus.$off('nextStepDisabled')
} },
});
Vue.component('button-component', {
props: {
basicClasses: {
type: Object,
default: function () {
return {
'button-white': true
}
}
},
nextStepClasses: {
type: Object,
default: function () {
return {
'button-primary': true
}
}
},
nextStepDisabled:{
type: Boolean,
default: false
},
nowOrder: Number,
totalElements: Number
},
template: '<div>\
<button class="btn" :disabled="nextStepStatus" :class="primary" \
v-if="order != total - 1" @click="handleNextStep">下一步</button>\
<button class="btn" :disabled="submiteStatus" :class="primary" \
v-if="order == total - 1" @click="handleSubmit">提交</button>\
<button class="btn" :disabled="false" :class="basic"\
v-if= "order != 0" @click="handleBackStep">上一步</button>\
<button class="btn" :disabled="false" @click="handleReset" :class="basic">重置</button>\
</div>',
data() {
return {
basic: this.basicClasses,
primary: this.nextStepClasses,
nextStepStatus: this.nextStepDisabled,
order: this.nowOrder,
total: this.totalElements,
submiteStatus: true
}
},
methods: {
handleNextStep: function () {
bus.$emit('nextStep')
},
handleBackStep: function () {
bus.$emit('backStep')
},
handleSubmit: function () {
bus.$emit('submit')
},
handleReset: function () {
let _this = this;
bus.$emit('reset', _this.order)
}
},
mounted() {
let _this = this;
bus.$on('nextStepDisabled', function (status) {
_this.nextStepStatus = status });
bus.$on('submiteDisabled', function (status) {
_this.submiteStatus = status })
}, });
var app = new Vue({
el: "#app",
data: {
currentOrder: 0,
questions: [
{
title: '请问您的性别是？',
chooses: {
type: 'radio',
values: [{ 'name': '男', 'value': '1' }, { 'name': '女', 'value': '2' }, { 'name': '保密', 'value': '3' }],
selected: ''
}
},
{
title: '请选择您的兴趣爱好？',
chooses: {
type: 'checkbox',
values: [{ 'name': '看书', 'value': 'read book' },
{ 'name': '游泳', 'value': 'swim' },
{ 'name': '跑步', 'value': 'run' },
{ 'name': '看电影', 'value': 'see movie' }],
selected: []
}
},
{
title: '请介绍一下你自己',
chooses: {
type: 'text',
value: ''
}
}, ]
},
methods: {
handleNext: function () {
let current = this.currentOrder;
if (++current >= this.questions.length) {
return;
}else{
this.currentOrder += 1;
} },
handleBack: function () {
let currentOrder = this.currentOrder;
if (-- currentOrder < 0) {
return;
}else{
this.currentOrder -= 1;
}
},
handleReset: function (order, val) {
let currentQuestion = this.questions[order].chooses;
if (currentQuestion.type == 'radio') {
currentQuestion.selected = val === undefined ? '': val;
} else if (currentQuestion.type == 'checkbox') {
currentQuestion.selected = val === undefined ? [] : val;
} else {
currentQuestion.value = val === undefined ? '' : val
}
}
},
mounted: function () {
let _this = this;
bus.$on('nextStep', function (msg) {
let current = _this.currentOrder;
if (++current >= _this.questions.length) {
return;
} else {
_this.currentOrder += 1;
}
});
bus.$on('backStep', function (msg) {
let currentOrder = _this.currentOrder;
if (--currentOrder < 0) {
return;
} else {
_this.currentOrder -= 1;
}
});
bus.$on('submit', function (msg) {
console.log('提交')
});
bus.$on('reset', function (order) {
_this.handleReset(order)
});
bus.$on('valueChange', function (order, val) {
_this.handleReset(order, val)
});
}
})
CSS
[v-cloak]{
display: none;
}
.btn {
border: none;
outline:none;
color: white;
padding: 7px 25px;
text-align: center;
text-decoration: none;
display: inline-block;
font-size: 16px;
margin: 4px 2px;
cursor: pointer;
}
.button-white {
background-color: rgb(217, 219, 223);
color: #000000;
}
.button-white:active {
background-color: rgb(134, 149, 179);
color: #000000;
}
.button-primary {
background-color: rgb(39, 126, 228);
border: none;
color: white;
padding: 7px 25px;
text-align: center;
text-decoration: none;
display: inline-block;
font-size: 16px;
margin: 4px 2px;
cursor: pointer;
}
.button-primary:active {
background-color: rgb(185, 171, 31);
}
.button-primary:disabled {
background-color: rgb(115, 122, 130);
}
5. 升级
- 组件重复内容很多，可合并
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