如何更改按钮的当前背景颜色 onclick jQuery

Question

我使用测验，我想更改 colors 个按钮，所以当我点击按钮时，我想更改他的背景颜色，我有 div，其中我有 dynamycaly 创建的按钮，对于这个按钮，我想更改颜色。

记者：

var quiz = [
    { stepName: "Check Oil", frequency: "1 / Shift", stepDescription: "Verify the presence of spilled oil", image: "https://cdn.iconscout.com/icon/free/png-512/schedule-maintenance-1575170-1331504.png", choices: ["OK", "NOK", "N/A"], savedAnswer: "" },
    { stepName: "Check noise", frequency: "1 / Shift", stepDescription: "Check for unusual noise from machine", image: "", choices: ["OK", "NOK", "N/A"], savedAnswer: "" },
    { stepName: "Clean filter", frequency: "1 / Week (Monday)", stepDescription: "Clean the air filter at compressed air inlet", image: "https://cdn.iconscout.com/icon/free/png-512/schedule-maintenance-1575170-1331504.png", choices: ["OK", "NOK", "N/A"], savedAnswer: "" },
    { stepName: "Check Andon", frequency: "1 / Shift", stepDescription: "Check if andon light is on", image: "https://cdn.iconscout.com/icon/free/png-512/schedule-maintenance-1575170-1331504.png", choices: ["OK", "NOK", "N/A"], savedAnswer: "" },
    { stepName: "Safety barrier", frequency: "1 / Shift", stepDescription: "Check the proper functionality of light barrier(s)", image: "https://cdn.iconscout.com/icon/free/png-512/schedule-maintenance-1575170-1331504.png", choices: ["OK", "NOK"], savedAnswer: "" }
];

var index = 0;

function parseQuiz() {
    for (var i = 0; quiz.length > i; i++) {
        creatingAnswers(quiz[index].choices[i]);
        setQuizToDiv(quiz[index].stepName, quiz[index].frequency, quiz[index].stepDescription, quiz[index].image);
    }
}

function setQuizToDiv(stepName, frequency, stepDescription, image) {
    $(".quiz-container").html('');
    var quizHtml;
    if (image != "") {
        quizHtml = `
        <div class="step-name">
            ${stepName}
        </div>
        <div class="frequency">
           Frequency: ${frequency}
        </div>
        <div class="step-desc">
           ${stepDescription}
        </div>
        <div class="step-image">
        <div id="overlay"></div>
        <img class="main-img" src="${image}" />
        </div>`;
    } else {
        quizHtml = `
        <div class="step-name">
            ${stepName}
        </div>
        <div class="frequency">
           Frequency: ${frequency}
        </div>
        <div class="step-desc">
           ${stepDescription}
        </div>
        <div class="separation-div"></div>
        `;
    }

    $(".quiz-container").append(quizHtml);
}

function creatingAnswers(choises) {
    if (choises != undefined) {
        var answers = `<button class="btn next-btn">${choises}</button>`
        $(".answ-container").append(answers);
    }
}

parseQuiz();

$(".quiz-container").on("click", ".main-img", function () {
    $('#overlay')
        .css({ backgroundImage: `url(${this.src})` })
        .addClass('open')
        .one('click', function () { $(this).removeClass('open'); });
});

$(".answ-container").on("click", ".next-btn", function () {
    let indexData = index + 1;
    let arrayData = quiz.length - 1;
    if (indexData <= arrayData) {
        quiz[index].savedAnswer = $(this).text();
        index++;
        $(".answ-container").html("");
        parseQuiz();
        navButton();
    }
});

HTML：

<div class="quiz-container"></div>
<div class="answ-container"></div>

所以我尝试更改此功能中的背景颜色

$(".answ-container").on("点击", ".next-btn", function () {

要添加此代码：

$(this).css("background-color","red")

但这对我不起作用。 所以在点击我想改变按钮的背景时，当我 go 到我着色的下一个问题 previus 按钮被保存时。

工作示例： https://jsfiddle.net/qunzorez/Lnt8f2dv/8/

Answer 1

好的，我想我明白你想要什么。 这是一个线索，这样你就可以进步。 我不会编辑你的 jsfiddle 因为你的代码很乱......

您可以在 JS 中放入什么：

$(".answ-container").on("click", ".next-btn", function () {
  // adding the class to the clicked button
    $(this).addClass('clicked')
  // removing the class of the siblings
  $(this).siblings().removeClass('clicked')
  // saving the index of the answer clicked
  quiz[index].savedAnswer = $(this).index()

您可以在 CSS 中输入：

.clicked {
  background-color: green;
}

当您创建答案按钮时，您为保存了索引的按钮添加“点击”class。

原则是玩类。

Answer 2

如果我在第一个问题中回答好，我 go 到下一个，但我在上一个问题中犯了错误我将有可能改变主意，为此我创建按钮 previus [原文如此]，当用户点击上一个时，它会上一个问题，应该显示 previus[sic] 答案

在creatingAnswers检查当前问题的savedAnswer

if (quiz[index].savedAnswer == choises)

并做你的事情（例如添加一个类） - 在更新的小提琴（下面）中我已经将append交换到appendTo以添加 jquery obj，给出：

function creatingAnswers(choises) {
    if (choises != undefined) {
        var answers = `<button class="btn next-btn">${choises}</button>`
        var ans = $(answers).appendTo(".answ-container");
        if (quiz[index].savedAnswer == choises) {
            ans.addClass("userchoice");
        }
    }
}

更新小提琴： https://jsfiddle.net/187autjo/

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还有一个较早的错误（在评论中讨论）循环测验计数而不是答案计数 - 这也在小提琴中更新。