如何使用 Bootstrap 创建多步进度条？

在本文中，我们将使用 Bootstrap 创建一个多步骤进度条。除了 Bootstrap，我们还将使用 jQuery 进行 DOM 操作。

进度条用于显示已完成的工作量。进度条的强度指示工作的进度。它通常用于 YouTube、GitHub 等在线 Web 应用程序中，以显示到目前为止页面的加载方式。您还可以在将内容下载或上传到 Web 应用程序时找到进度条。

多步骤进度条用于以步骤格式显示工作进度。

例如：

Step1 -> Step2 -> Step3 -> Final

每个步骤都有一个进度条，显示其到达下一步的进度。

示例：要创建多步进度条，让我们创建 3 个文件index.html 、 styles.css 、 script.js 。

索引.html：

HTML

  

    
  
    
    
  
    
    
  
    

  

    
        
            
                
                    
                        
                            
                                Step 1
                            
                            Step 2
                            Step 3
                            Step 4
                        
                        
                            
                         
                        
                            Welcome To GFG Step 1
                            
                        
                        
                            Welcome To GFG Step 2
                            
                            
                        
                        
                            Welcome To GFG Step 3
                            
                            
                        
                        
                            
                                
                                    FINISHED
                                
                            
                            
                        
                    
                
            
        
    


  

样式.css：

CSS

* {
    margin: 0;
    padding: 0
}
  
html {
    height: 100%
}
  
h2{
    color: #2F8D46;
}
#form {
    text-align: center;
    position: relative;
    margin-top: 20px
}
  
#form fieldset {
    background: white;
    border: 0 none;
    border-radius: 0.5rem;
    box-sizing: border-box;
    width: 100%;
    margin: 0;
    padding-bottom: 20px;
    position: relative
}
  
.finish {
    text-align: center
}
  
#form fieldset:not(:first-of-type) {
    display: none
}
  
#form .previous-step, .next-step {
    width: 100px;
    font-weight: bold;
    color: white;
    border: 0 none;
    border-radius: 0px;
    cursor: pointer;
    padding: 10px 5px;
    margin: 10px 5px 10px 0px;
    float: right
}
  
.form, .previous-step {
    background: #616161;
}
  
.form, .next-step {
    background: #2F8D46;
}
  
#form .previous-step:hover,
#form .previous-step:focus {
    background-color: #000000
}
  
#form .next-step:hover,
#form .next-step:focus {
    background-color: #2F8D46
}
  
.text {
    color: #2F8D46;
    font-weight: normal
}
  
#progressbar {
    margin-bottom: 30px;
    overflow: hidden;
    color: lightgrey
}
  
#progressbar .active {
    color: #2F8D46
}
  
#progressbar li {
    list-style-type: none;
    font-size: 15px;
    width: 25%;
    float: left;
    position: relative;
    font-weight: 400
}
  
#progressbar #step1:before {
    content: "1"
}
  
#progressbar #step2:before {
    content: "2"
}
  
#progressbar #step3:before {
    content: "3"
}
  
#progressbar #step4:before {
    content: "4"
}
  
#progressbar li:before {
    width: 50px;
    height: 50px;
    line-height: 45px;
    display: block;
    font-size: 20px;
    color: #ffffff;
    background: lightgray;
    border-radius: 50%;
    margin: 0 auto 10px auto;
    padding: 2px
}
  
#progressbar li:after {
    content: '';
    width: 100%;
    height: 2px;
    background: lightgray;
    position: absolute;
    left: 0;
    top: 25px;
    z-index: -1
}
  
#progressbar li.active:before,
#progressbar li.active:after {
    background: #2F8D46
}
  
.progress {
    height: 20px
}
  
.progress-bar {
    background-color: #2F8D46
}

脚本.js

Javascript

$(document).ready(function () {
    var currentGfgStep, nextGfgStep, previousGfgStep;
    var opacity;
    var current = 1;
    var steps = $("fieldset").length;
  
    setProgressBar(current);
  
    $(".next-step").click(function () {
  
        currentGfgStep = $(this).parent();
        nextGfgStep = $(this).parent().next();
  
        $("#progressbar li").eq($("fieldset")
            .index(nextGfgStep)).addClass("active");
  
        nextGfgStep.show();
        currentGfgStep.animate({ opacity: 0 }, {
            step: function (now) {
                opacity = 1 - now;
  
                currentGfgStep.css({
                    'display': 'none',
                    'position': 'relative'
                });
                nextGfgStep.css({ 'opacity': opacity });
            },
            duration: 500
        });
        setProgressBar(++current);
    });
  
    $(".previous-step").click(function () {
  
        currentGfgStep = $(this).parent();
        previousGfgStep = $(this).parent().prev();
  
        $("#progressbar li").eq($("fieldset")
            .index(currentGfgStep)).removeClass("active");
  
        previousGfgStep.show();
  
        currentGfgStep.animate({ opacity: 0 }, {
            step: function (now) {
                opacity = 1 - now;
  
                currentGfgStep.css({
                    'display': 'none',
                    'position': 'relative'
                });
                previousGfgStep.css({ 'opacity': opacity });
            },
            duration: 500
        });
        setProgressBar(--current);
    });
  
    function setProgressBar(currentStep) {
        var percent = parseFloat(100 / steps) * current;
        percent = percent.toFixed();
        $(".progress-bar")
            .css("width", percent + "%")
    }
  
    $(".submit").click(function () {
        return false;
    })
});

输出：

jQuery 是一个开源 JavaScript 库，它简化了 HTML/CSS 文档之间的交互，它以其“少写，多做”的理念而广为人知。
您可以按照此 jQuery 教程和 jQuery 示例从头开始学习 jQuery。