uniapp专题学习（二）
前言
书接上回，我们学习了uniapp的基本概念、用处、vue语法在uniapp中的使用、page.json的全局配置和局部配置以及组件的使用。本节我们将继续学习uniapp组件。
uniapp组件学习
viedo
视频播放组件。
常用属性：src、autoplay、loop、muted，详情请查看viedo组件
案例代码：
<template>
<view>
<view class="page-body">
<view class="page-section">
<video id="myVideo" src="https://web-assets.dcloud.net.cn/unidoc/zh/wap2appvsnative.mp4" @error="videoErrorCallback" :danmu-list="danmuList"
enable-danmu danmu-btn controls>
</video>
<view class="uni-list">
<view class="uni-list-cell">
<view>
<view class="uni-label">弹幕内容</view>
</view>
<view class="uni-list-cell-db">
<input @blur="bindInputBlur" class="uni-input" type="text" placeholder="在此处输入弹幕内容" />
</view>
</view>
</view>
<view class="btn-area">
<button @tap="bindSendDanmu" class="page-body-button" formType="submit">发送弹幕</button>
</view>
</view>
</view>
</view>
</template>
<script>
export default {
data() {
return {
title: 'video',
src: '',
inputValue: '',
danmuList: [{
text: '第 1s 出现的弹幕',
color: '#ff0000',
time: 1
},
{
text: '第 3s 出现的弹幕',
color: '#ff00ff',
time: 3
}
]
}
},
onReady: function (res) {
this.videoContext = uni.createVideoContext('myVideo')
},
methods: {
bindInputBlur: function (e) {
this.inputValue = e.target.value
},
bindButtonTap: function () {
var that = this
uni.chooseVideo({
sourceType: ['album', 'camera'],
maxDuration: 60,
camera: ['front', 'back'],
success: function (res) {
this.src = res.tempFilePath
}
})
},
bindSendDanmu: function () {
this.videoContext.sendDanmu({
text: this.inputValue,
color: this.getRandomColor()
})
},
videoErrorCallback: function (e) {
console.log('视频错误信息:')
console.log(e.target.errMsg)
},
getRandomColor: function () {
const rgb = []
for (let i = 0; i < 3; ++i) {
let color = Math.floor(Math.random() * 256).toString(16)
color = color.length == 1 ? '0' + color : color
rgb.push(color)
}
return '#' + rgb.join('')
}
}
}
</script>
<style lang="scss">
</style>
运行效果：
form
表单，将组件内的用户输入的<switch> <input> <checkbox> <slider> <radio> <picker> 提交。
案例代码：
<template>
<view>
<page-head title="form"></page-head>
<view class="uni-padding-wrap uni-common-mt">
<form @submit="formSubmit" @reset="formReset">
<view class="uni-form-item uni-column">
<view class="title">姓名</view>
<input class="uni-input" name="nickname" placeholder="请输入姓名" />
</view>
<view class="uni-form-item uni-column">
<view class="title">性别</view>
<radio-group name="gender">
<label>
<radio value="男" /><text>男</text>
</label>
<label>
<radio value="女" /><text>女</text>
</label>
</radio-group>
</view>
<view class="uni-form-item uni-column">
<view class="title">爱好</view>
<checkbox-group name="loves">
<label>
<checkbox value="读书" /><text>读书</text>
</label>
<label>
<checkbox value="写字" /><text>写字</text>
</label>
</checkbox-group>
</view>
<view class="uni-form-item uni-column">
<view class="title">年龄</view>
<slider value="20" name="age" show-value></slider>
</view>
<view class="uni-form-item uni-column">
<view class="title">保留选项</view>
<view>
<switch name="switch" />
</view>
</view>
<view class="uni-btn-v">
<button form-type="submit">Submit</button>
<button type="default" form-type="reset">Reset</button>
</view>
</form>
</view>
</view>
</template>
<script>
export default {
check : function (data, rule){
for(var i = 0; i < rule.length; i++){
if (!rule[i].checkType){return true;}
if (!rule[i].name) {return true;}
if (!rule[i].errorMsg) {return true;}
if (!data[rule[i].name]) {this.error = rule[i].errorMsg; return false;}
switch (rule[i].checkType){
case 'string':
var reg = new RegExp('^.{' + rule[i].checkRule + '}$');
if(!reg.test(data[rule[i].name])) {this.error = rule[i].errorMsg; return false;}
break;
case 'int':
var reg = new RegExp('^(-[1-9]|[1-9])[0-9]{' + rule[i].checkRule + '}$');
if(!reg.test(data[rule[i].name])) {this.error = rule[i].errorMsg; return false;}
break;
break;
case 'between':
if (!this.isNumber(data[rule[i].name])){
this.error = rule[i].errorMsg;
return false;
}
var minMax = rule[i].checkRule.split(',');
minMax[0] = Number(minMax[0]);
minMax[1] = Number(minMax[1]);
if (data[rule[i].name] > minMax[1] || data[rule[i].name] < minMax[0]) {
this.error = rule[i].errorMsg;
return false;
}
break;
case 'betweenD':
var reg = /^-?[1-9][0-9]?$/;
if (!reg.test(data[rule[i].name])) { this.error = rule[i].errorMsg; return false; }
var minMax = rule[i].checkRule.split(',');
minMax[0] = Number(minMax[0]);
minMax[1] = Number(minMax[1]);
if (data[rule[i].name] > minMax[1] || data[rule[i].name] < minMax[0]) {
this.error = rule[i].errorMsg;
return false;
}
break;
case 'betweenF':
var reg = /^-?[0-9][0-9]?.+[0-9]+$/;
if (!reg.test(data[rule[i].name])){this.error = rule[i].errorMsg; return false;}
var minMax = rule[i].checkRule.split(',');
minMax[0] = Number(minMax[0]);
minMax[1] = Number(minMax[1]);
if (data[rule[i].name] > minMax[1] || data[rule[i].name] < minMax[0]) {
this.error = rule[i].errorMsg;
return false;
}
break;
case 'same':
if (data[rule[i].name] != rule[i].checkRule) { this.error = rule[i].errorMsg; return false;}
break;
case 'notsame':
if (data[rule[i].name] == rule[i].checkRule) { this.error = rule[i].errorMsg; return false; }
break;
case 'email':
var reg = /^\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*$/;
if (!reg.test(data[rule[i].name])) { this.error = rule[i].errorMsg; return false; }
break;
case 'phoneno':
var reg = /^1[0-9]{10,10}$/;
if (!reg.test(data[rule[i].name])) { this.error = rule[i].errorMsg; return false; }
break;
case 'zipcode':
var reg = /^[0-9]{6}$/;
if (!reg.test(data[rule[i].name])) { this.error = rule[i].errorMsg; return false; }
break;
case 'reg':
var reg = new RegExp(rule[i].checkRule);
if (!reg.test(data[rule[i].name])) { this.error = rule[i].errorMsg; return false; }
break;
case 'in':
if(rule[i].checkRule.indexOf(data[rule[i].name]) == -1){
this.error = rule[i].errorMsg; return false;
}
break;
case 'notnull':
if(data[rule[i].name] == null || data[rule[i].name].length < 1){this.error = rule[i].errorMsg; return false;}
break;
}
}
return true;
},
data() {
return {
}
},
methods: {
formSubmit: function(e) {
console.log('form发生了submit事件，携带数据为：' + JSON.stringify(e.detail.value))
//定义表单规则
var rule = [
{name:"nickname", checkType : "string", checkRule:"1,3", errorMsg:"姓名应为1-3个字符"},
{name:"gender", checkType : "in", checkRule:"男,女", errorMsg:"请选择性别"},
{name:"loves", checkType : "notnull", checkRule:"", errorMsg:"请选择爱好"}
];
//进行表单检查
var formData = e.detail.value;
var checkRes = check(formData, rule);
if(checkRes){
uni.showToast({title:"验证通过!", icon:"none"});
}else{
uni.showToast({ title: graceChecker.error, icon: "none" });
}
},
formReset: function(e) {
console.log('清空数据')
}
}
}
</script>
<style>
.uni-form-item .title {
padding: 20rpx 0;
}
</style>
案例效果：
navigator
页面跳转。
该组件类似HTML中的<a>组件，但只能跳转本地页面。目标页面必须在pages.json中注册。
该组件的功能有API方式，另见：https://uniapp.dcloud.io/api/router?id=navigateto
案例代码：
<navigator url="../index/index" open-type="navigate">跳转index页面</navigator>
<navigator url="../viedo/viedo" open-type="redirect">跳转viedo页面</navigator>
<navigator url="../viedo/viedo" open-type="switchTab">跳转viedo页面</navigator>
<navigator url="../list/list" open-type="reLaunch">跳转list页面</navigator>
Tips：
- open-type="navigate" 保留当前页面，跳转到应用内的某个页面，使用
uni.navigateBack可以返回到原页面。 - open-type="redirect" 关闭当前页面，跳转到应用内的某个页面。
- open-type="switchTab" 关闭所有页面，打开到应用内的某个页面。
- open-type="reLaunch" 跳转到 tabBar 页面，并关闭其他所有非 tabBar 页面。（tabBar页面指的是首页下面的导航页面）
另外一种跳转方式还有js方式的页面跳转：
toPage(){
uni.navigateTo({
url: 'pages/test?id=1',
events: {
// 为指定事件添加一个监听器，获取被打开页面传送到当前页面的数据
acceptDataFromOpenedPage: function(data) {
console.log(data)
},
someEvent: function(data) {
console.log(data)
}
...
},
success: res=> {
console.log(res)
}
})
}
tabBar
如果应用是一个多 tab 应用，可以通过 tabBar 配置项指定一级导航栏，以及 tab 切换时显示的对应页。
在 pages.json 中提供 tabBar 配置，不仅仅是为了方便快速开发导航，更重要的是在App和小程序端提升性能。在这两个平台，底层原生引擎在启动时无需等待js引擎初始化，即可直接读取 pages.json 中配置的 tabBar 信息，渲染原生tab。具体的属性配置请查看属性说明。
案例代码：
"tabBar": {
"color": "#333",
"selectedColor": "#015FF9",
"list": [
{
"text": "首页",
"pagePath": "pages/index/index",
"iconPath": "static/shouye.png",
"selectedIconPath": "static/shouye-xuanzhong.png"
},
{
"text": "视频",
"pagePath": "pages/viedo/viedo",
"iconPath": "static/video.png",
"selectedIconPath": "static/videoxuanzhong.png"
},
{
"text": "表单",
"pagePath": "pages/form/form",
"iconPath": "static/wode.png",
"selectedIconPath": "static/wode-xuanzhong.png"
}
]
}
页面效果：
