Angularjs 实现移动端在线测评效果

注：此文所用的angular版本为 1.6

一、运行效果图

二、需求

1. 点击选项时，背景变为黄色（即选中状态），并且自动切换到下一题

2. 切换到下一题时，顶部进度随之改变

3. 选中时要把对应的分值记录下来（因为要根据分值算出最后的测评结果）

4. 通过向右滑动可以查看前面做过的题目

5. 当前题目没选，无法切换到下一题

6. 当选中最后一道题目时，切换到测评结果页

三、具体实现

 题目json数据，总共10道题，这里为了节省篇幅，就只贴出3道了。 （Score是分数， OrderNo是答案序号）

{ "Questions":
    [
        {    
             "Question":"您的年龄范围:",
             "AnswerList":[
                  {"Text":"30岁以下","Score":5,"OrderNo":0},
                  {"Text":"30-39岁","Score":4,"OrderNo":1},
                  {"Text":"40-49岁","Score":3,"OrderNo":2},
                  {"Text":"50-59岁","Score":2,"OrderNo":3},
                  {"Text":"60岁以上","Score":1,"OrderNo":4}]
        },
        {    
            "Question":"您的婚姻状况为:",
            "AnswerList":[
                {"Text":"未婚","Score":5,"OrderNo":1},
                {"Text":"已婚","Score":4,"OrderNo":2},
                {"Text":"单身有婚史","Score":3,"OrderNo":3},
                {"Text":"丧偶","Score":2,"OrderNo":4},
                {"Text":"不详","Score":1,"OrderNo":5}]
        },
        {    
            "Question":"您的收入需要用来供养其他人（如父母或子女）吗？",
            "AnswerList":[
                {"Text":"不需供养其他人","Score":5,"OrderNo":1},
                {"Text":"供养1人","Score":4,"OrderNo":2},
                {"Text":"供养2人","Score":3,"OrderNo":3},
                {"Text":"供养3人","Score":2,"OrderNo":4},
                {"Text":"供养4人或以上","Score":1,"OrderNo":5}]
        }
    ]
}

Html代码

<div class="wrapper" ng-controller="RiskTestController as vm">
    <div class="process-box">
        <ul>
            <li class="page-icon"><span class="icon icon-txt">1</span></li>
            <li class="page-icon"><span class="icon icon-txt">2</span></li>
            <li class="page-icon"><span class="icon icon-txt">3</span></li>
            <li class="page-icon"><span class="icon icon-txt">4</span></li>
            <li class="page-icon"><span class="icon icon-txt">5</span></li>
            <li class="page-icon"><span class="icon icon-txt">6</span></li>
            <li class="page-icon"><span class="icon icon-txt">7</span></li>
            <li class="page-icon"><span class="icon icon-txt">8</span></li>
            <li class="page-icon"><span class="icon icon-txt">9</span></li>
            <li class="page-icon"><span class="icon icon-txt">10</span></li>
        </ul>
        <div class="page-info">
            已完成 {{vm.count}}/10
        </div>
    </div>
    <ul class="list-box" id="listBox">
        <li class="list-item" ng-repeat="question in vm.questionList track by $index" ng-class="{'first-li': $index == 0}">
            <div class="question-box">
                <div class="question">{{$index + 1}}. {{question.Question}}</div>
                <ul class="answer">
                    <li class="answer-item" 
                        ng-repeat="answer in question.AnswerList track by $index" 
                        ng-click="vm.OnClickAnswer(answer, $parent.$index)"
                        ng-class="{'selected': answer.Selected}">
                        {{vm.letter[$index]}}. {{answer.Text}}
                    </li>
                </ul>
            </div>
        </li>
    </ul>
    <div ng-show="vm.showResult">
        <span>{{vm.point}}</span>
    </div>
 </div>

核心CSS样式代码

        .wrapper{
            width: 100%;
            height: 100%;
            position: relative;
            overflow: hidden;
        }
        .process-box{
            width: 17.25rem;
            height: 2.5rem;
            line-height: 2.5rem;
            background-color: #FFF;
            margin: 1.5rem auto;
            border-radius: 0.2rem;
        }
        .page-icon{
            float: left;
            font-size: 0.4rem;
            color: #FFE7C9;
            width: 1.32rem;
            text-align: center;
        }
        .page-info{
            font-size: 0.65rem;
            color: #F3A84D;
        }
        .question-box{
            width: 17.25rem;
            background-color: #FFF;
            margin-left: 0.75rem;
            border-radius: 0.2rem;
        }
        .question{
            font-size: 0.8rem;
            color: #43689F;
            padding: 1.1rem 0 0.8rem 0.75rem;
        }
        .answer-item{
            font-size: 0.75rem;
            color: #80A1D0;
            border-top: 1px solid #EEE;
            padding: 1.1rem 0 1.1rem 1.0rem;
        }
        .icon-txt{
            background-color: orange;
            border-radius: 0.5rem;
            display: block;
            width: 0.8rem;
            height: 0.8rem;
            line-height: 0.8rem;
            margin: 0.95rem auto;
        }
        .icon-txt-active{
            background-color: #FFE7C9;
            border-radius: 0.3rem;
            display: block;
            width: 0.3rem;
            height: 0.3rem;
            line-height: 2.0rem;
            color: #FFF;
            margin: 1.25rem auto;
        }
        .list-item {
            width: 100%;
            position: absolute;
            transform: translate3d(100%,0,0);
            transition: transform 0.5s;
        }
        .first-li {
            transform: translate3d(0,0,0);
        }
        .selected {
            background-color: orange;
        }

控制器代码（Controller）

(function (agr) {
    //模块 - app
    var app = agr.module('app', []);

    //控制器 - 风险测评
    app.controller('RiskTestController', ['$scope', '$http', RiskTestController]);

    function RiskTestController($scope, $http) {
        var vm = this;

        vm.letter = ['A', 'B', 'C', 'D', 'E'];  //答案编号
        vm.questionList = [];       //题目
        vm.point = 0;               //得分
        vm.showResult = false;      //是否显示结果页

        //加载数据       
        $http({
            method: 'GET',
            url: '/Service/RiskTest',
        }).then(function (resp) {               
            vm.questionList = resp.data.Questions;
        }, function (resp) {
            console.log("ERROR", resp);
        });

        var lis = document.querySelectorAll(".list-item"),  //题目列表
            count = 0,  //做了多少道题
            index = 0,  //当前第几题
            BIG = 9;    //最大索引值，因为总共10道题，所以是9（常量）

        //选择答案
        vm.OnClickAnswer = function (answer, $parentIndex) {

            var icons = document.querySelectorAll(".icon"),
                curr = $parentIndex;        //当前题目索引
                next = $parentIndex + 1;    //下一题索引
                nextQuestion = vm.questionList[next];   //下一道题

            //当前问题的答案列表
            var answerList = vm.questionList[$parentIndex].AnswerList;

            //为每个答案对象添加属性 Selected, 默认值为false
            for (var i = 0, len = answerList.length; i < len; i++) {
                answerList[i].Selected = false;
            }

            //将选中的答案设置为true (从而应用样式.selected 将背景色设置为黄色)
            answer.Selected = true;

            //判断是否为最后一道题
            if ($parentIndex < BIG) {   //不是最后一题

                //改变顶部进度样式
                icons[curr].classList.remove("icon-txt");
                icons[curr].classList.add("icon-txt-active");

                //切换到下一题
                lis[curr].style.webkitTransform = 'Translate3d(-100%,0,0)';
                nextQuestion && (lis[next].style.webkitTransform = 'Translate3d(0,0,0)');

            } else {    //是最后一题

                //改变顶部进度样式
                icons[curr].classList.remove("icon-txt");
                icons[curr].classList.add("icon-txt-active");

                //计算分数
                vm.point = CalcPoint();

                //显示测评结果
                vm.showResult = true;
            }

            //做了多少题
            count = CalcCount();

            //因为选中答案会自动切换到下一题，所以索引更新为next
            index = next;         
        }

        //计算分数
        var CalcPoint = function () {
            var point = 0;
            for (var i = 0, lenq = vm.questionList.length; i < lenq; i++) {
                for (var k = 0, lena = vm.questionList[i].AnswerList.length; k < lena; k++) {
                    if (vm.questionList[i].AnswerList[k].Selected) {
                        point += vm.questionList[i].AnswerList[k].Score;
                    }
                }
            }
            return point;
        }

        //计算当前做了多少道题
        var CalcCount = function(){
            var count = 0;
            for (var i = 0, lenq = vm.questionList.length; i < lenq; i++) {
                for (var k = 0, lena = vm.questionList[i].AnswerList.length; k < lena; k++) {
                    if (vm.questionList[i].AnswerList[k].Selected) {
                        count++;
                    }
                }
            }
            return count;
        }

        /** 触屏滑动效果处理 == 开始 == **/

        var offsetX = 0,    //手指滑动偏移量
            startX,         //滑动开始时的X轴坐标点
            startTime;      //手指滑动开始时间

        //触屏开始
        var startHandler = function (evt) {

            //每次触屏时将偏移量重置为0
            offsetX = 0;

            //记录X坐标
            startX = evt.touches[0].pageX;

            //取得时间戳
            startTime = new Date() * 1;
        };

        //触屏滑动
        var moveHandler = function (evt) {
            //阻止默认事件
            evt.preventDefault();

            //记录手指滑动的偏移量
            offsetX = evt.touches[0].pageX - startX;

            var curr = index,
                prev = index - 1,
                next = index + 1,
                prevQuestion = vm.questionList[prev],
                nextQuestion = vm.questionList[next],
                width = window.innerWidth;         

            //手指滑动时题卡跟着手指滑动（向右滑：[偏移量大于0，即正数，并且不是第一道题]）
            if (offsetX > 0 && index > 0) {
                lis[curr].style.webkitTransform = 'Translate3d(' + offsetX + 'px, 0, 0)';
                prevQuestion && (lis[prev].style.webkitTransform = 'Translate3d(' + (offsetX - width) + 'px, 0, 0)');
            }

            //手指滑动时题卡跟着手指滑动（向左滑：[偏移量小于0，即负数，并且不是最后一题]）
            if (offsetX < 0 && index < count) {
                lis[curr].style.webkitTransform = 'Translate3d(' + offsetX + 'px, 0, 0)';
                nextQuestion && (lis[next].style.webkitTransform = 'Translate3d(' + (offsetX + width) + 'px, 0, 0)');
            }

        };

        //触屏结束
        var endHandler = function (evt) {
            var boundary = window.innerWidth / 5,        //当手指滑动的偏移量为屏幕的5分之一时才进行切换
                quickBoundary = 60,                        //当手指快速滑动时，偏移量为60即可 
                endTime = new Date() * 1;                 //获取结束时间戳

            //判断是否为快速滑动
            if (endTime - startTime > 1000) {

                //判断是向左滑还是向右滑
                if (offsetX > 0) {

                    //判断是否达到切换偏移量
                    if (offsetX >= boundary) {
                        MoveToRight();
                    } else {
                        ResetMoveRight();
                    }
                } else{
                    if (offsetX < -boundary) {
                        MoveToLeft();
                    } else {
                        ResetMoveLeft();
                    }
                }
            } else {
                if (offsetX > 0) {
                    if (offsetX >= quickBoundary) {
                        MoveToRight();
                    } else {
                        ResetMoveRight();
                    }
                } else {
                    if (offsetX < -quickBoundary) {
                        MoveToLeft();
                    } else {
                        ResetMoveLeft();
                    }
                }
            }
        };

        //向右滑动事件
        var MoveToRight = function () {
            var curr = index,
                prev = index -1,
                prevQuestion = vm.questionList[prev];

            if (curr > 0) {
                lis[curr].style.webkitTransform = 'Translate3d(100%, 0, 0)';
                prevQuestion && (lis[prev].style.webkitTransform = 'Translate3d(0, 0, 0)');

                index--;
            }          
        }

        //右滑重置(当滑动距离没达到切换偏移量时，题卡回到原点)
        var ResetMoveRight = function () {
            var curr = index,
                prev = index -1,
                prevQuestion = vm.questionList[prev];

            lis[curr].style.webkitTransform = 'Translate3d(0, 0, 0)';
            prevQuestion && (lis[prev].style.webkitTransform = 'Translate3d(-100%, 0, 0)');
        }

        //向左滑动事件
        var MoveToLeft = function () {
            var curr = index,
                next = index + 1,
                nextQuestion = vm.questionList[next];

            if (curr < count) {
                lis[curr].style.webkitTransform = 'Translate3d(-100%, 0, 0)';
                nextQuestion && (lis[next].style.webkitTransform = 'Translate3d(0, 0, 0)');

                index++;
            }   
        }

        //左滑重置(当滑动距离没达到切换偏移量时，题卡回到原点)
        var ResetMoveLeft = function () {
            var curr = index,
                next = index + 1,
                nextQuestion = vm.questionList[next];

            lis[curr].style.webkitTransform = 'Translate3d(0, 0, 0)';
            nextQuestion && (lis[next].style.webkitTransform = 'Translate3d(100%, 0, 0)');
        }

        //监听滑动事件     
        var outer = document.getElementById("listBox");
        outer.addEventListener('touchstart', startHandler);
        outer.addEventListener('touchmove', moveHandler);
        outer.addEventListener('touchend', endHandler);
        

        /** 触屏滑动效果处理 == 结束 == **/
    }
})(angular);

大概就是这个样子了，代码都写了注释。大家有什么建议或发现什么问题请留言，帮忙优化优化，谢谢~