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javascript - 如何更改按钮onclick jQuery的当前背景颜色

问题描述

我使用测验，我想改变按钮的颜色，所以当我点击按钮时，我想改变他的背景颜色，我有一个 div，其中我有 dynamycaly 创建的按钮，对于这个按钮，我想改变颜色。

JS：

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>

所以我尝试在这个函数中改变 bg 颜色

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

要添加此代码：

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

但这对我不起作用。因此，在单击时，我想更改按钮的 bg，并且当我转到我着色的下一个问题 previus 按钮时，将被保存。

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

标签： javascripthtmljquery

解决方案

好的，我想我明白你想要什么。这是一个线索，以便您可以进步。我不会编辑你的jsfiddle，因为你的代码非常混乱......

您可以在 JS 中添加的内容：

$(".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 中添加的内容：

.clicked {
  background-color: green;
}

当您创建答案按钮时，您会为按钮添加“单击”类并保存索引。

原则是与类一起玩。

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