如何循环通过无线电问题返回按钮Javascript

How To Loop Through Radio Questions Back Button Javascript

本文关键字：问题无线电返回按钮 Javascript 何循环循环更新时间：2023-09-26

我正在尝试通过带有'back'和'next'按钮的对象数组进行循环。由于某种原因，它不能正常循环。当"下一个"按钮被按下时，"返回"按钮应该减少每多按一次"下一个"按钮的次数。

这是访问返回按钮以返回单选问题集的函数。要查看完整的代码，请访问我的JS提琴。谢谢!

     var questions = {
    allQuestions: [

        {
            topQuestion: [" 1a) Click on which music producer, produced Justins Timberlake 4th Album?", "2a)Click on which famous celebrity did Justin Timberlake date in 1999? ", "3a)Click on which social media movie did Justin Timberlake starred in?", "4a)Click on what famous disney kids show did first Justin Timberlake made his first appearance?", "5a)Click on which famous singer did Justin Timberlake accidently tear clothes off during a performance?", "6a)What magazine named Justin Timberlake the Most Stylish Man In America?"],
            question: "1a)What popular site did Justin Timberlake invest 2.2 Million Dollars in? ",
            choices: ["Linkedin", "Facebook", "Myspace", "Youtube"],
        }, {
            question: "2b)Select which movie did Justin Timberlake film score in 2008?",
            choices: ["The Incredibles", "Shark Tank", "Finding Memo", "Star Wars"],
            correctAnswer: 1
        }, {
            question: "3b)What city was Justin Timberlake born in?",
            choices: ["Chicago", "Detroit", "Tenessee", "New York"],
            correctAnswer: 2
        }, {

]
};
      var newQues = Object.create(questions);
         var k = 0;
         var chngeRadio = 0;

         for (var i = 0; i < 4; i++) {

    container = document.getElementById("container");
    list = document.getElementById("list");
    var li = document.createElement("input");
    li.type = 'radio';
    li.name = 'radio_group';
    li.id = 'id1';
    li.value = newQues.allQuestions[i].correctAnswer;
    list.style.textAlign = "center";
    document.body.appendChild(li);
    div = document.createElement("div");
    text = document.createTextNode(newQues.allQuestions[0].choices[i]);
    list.appendChild(div);
    div.appendChild(li);
    div.appendChild(text);
}

     btn1.onclick = function (event) {
        event = EventUtil.getEvent(event);

        k++;
        while (list.firstChild) {
            list.removeChild(list.firstChild);
        };
         for (var m = 0; m < 4; m++) {

            container = document.getElementById("container");
            list = document.getElementById("list");
            var li = document.createElement("input");
            li.type = 'radio';
            li.name = 'radio_group';
            li.id = 'id1';
            li.value = newQues.allQuestions[m].correctAnswer;
            list.style.textAlign = "center";
            div = document.createElement("div");
            text = document.createTextNode(newQues.allQuestions[k].choices[m])
            //alert(k);
            list.appendChild(div);
            div.appendChild(li);
            div.appendChild(text);
        };

          // Assigns a event object to back button, this is where I would like
          // to go back and loop the radio questions but for some reason it only decrements 1 time
    if ( k >= 1) {
        btn2.onclick = function(event){
            event = EventUtil.getEvent(event);
            chngeRadio++;


              function replaceNode() {
             function replaceNode() {
             if (k === 1) {
                 //assigns count to 0
                 chngeRadio -= 1;
             };

             if (k === 2) {
                 //assigns count to 1
                 chngeRadio = 2;
                 chngeRadio -= 1;
             };

         };

         replaceNode()
             while (list.firstChild) {
                list.removeChild(list.firstChild);
            };

            for (var d = 0; d < 4; d++) {

                container = document.getElementById("container");
                list = document.getElementById("list");
                var li2 = document.createElement("input");
                li2.type = 'radio';
                li2.name = 'radio_group';
                li2.id = 'id2';
                li2.value = newQues.allQuestions[d].correctAnswer;
                li2.style.textAlign = "center";
                div2 = document.createElement("div");
                text2 = document.createTextNode(newQues.allQuestions[chngeRadio].choices[d])
                //alert(k);
                list.appendChild(div2);
                div2.appendChild(li2);
                div2.appendChild(text2);
            };
        };
    };

    };

我建议不使用chngeRadio和replaceNode()函数，用k--代替。另外，更改Back btn上的if条件。单击至k>1。

if ( k > 1) {
    btn2.onclick = function (event) {
        event = EventUtil.getEvent(event);
        k--;
        while (list.firstChild) {
            list.removeChild(list.firstChild);
        };
        for (var d = 0; d < 4; d++) {
            container = document.getElementById("container");
            list = document.getElementById("list");

…

        text2 = document.createTextNode(newQues.allQuestions[k].choices[d]);
        //alert(k);
        list.appendChild(div2);
        div2.appendChild(li2);
        div2.appendChild(text2);
    };
};