Implementation of HTML5/CSS3 web page loading progress bar, download progress bar and other classic cases

Today I bring you a cool progress bar. The progress bar gives users a better experience in time-consuming operations and will not make users feel like they are waiting blindly. For long-term waits without progress bars, users If the task freezes, close the application without hesitation; generally used for downloading tasks, deleting a large number of tasks, loading web pages, etc.; if you use HTML5 for mobile phone layout, it can also be used on mobile phones~

effect Picture:

1. HTML structure:

 <p id="loadBar01" class="loadBar">
        <p>
             <span class="percent">
                <i></i>
             </span>
        </p>
        <span class="percentNum">0%</span>
    </p>

Simple analysis:
p.loadBar represents the entire progress bar

p .loadBar p sets the rounded table frame, p.loadBar p span is the progress (dynamically changing the width), p.loadBar p span i is the progress filled with background color (i.e. width=100%)

HTML structure , everyone can design it by themselves, as long as it is reasonable, there is no problem~

2. CSS:

 body
        {
            font-family: Thoma, Microsoft YaHei, 'Lato', Calibri, Arial, sans-serif;
        }

        #content
        {
            margin: 120px auto;
            width: 80%;
        }

        .loadBar
        {
            width: 600px;
            height: 30px;
            border: 3px solid #212121;
            border-radius: 20px;
            position: relative;
        }

        .loadBar p
        {
            width: 100%;
            height: 100%;
            position: absolute;
            top: 0;
            left: 0;
        }

        .loadBar p span, .loadBar p i
        {
            box-shadow: inset 0 -2px 6px rgba(0, 0, 0, .4);
            width: 0%;
            display: block;
            height: 100%;
            position: absolute;
            top: 0;
            left: 0;
            border-radius: 20px;
        }

        .loadBar p i
        {
            width: 100%;
            -webkit-animation: move .8s linear infinite;
            background: -webkit-linear-gradient(left top, #7ed047 0%, #7ed047 25%, #4ea018 25%, #4ea018 50%, #7ed047 50%, #7ed047 75%, #4ea018 75%, #4ea018 100%);
            background-size: 40px 40px;
        }

        .loadBar .percentNum
        {
            position: absolute;
            top: 100%;
            right: 10%;
            padding: 1px 15px;
            border-bottom-left-radius: 16px;
            border-bottom-right-radius: 16px;
            border: 1px solid #222;
            background-color: #222;
            color: #fff;

        }

        @-webkit-keyframes move
        {
            0%
            {
                background-position: 0 0;
            }
            100%
            {
                background-position: 40px 0;
            }
        }

The effect at this time is:

The overall layout is to use position relative and absolute~

The more difficult part is the implementation of the gradient bar:

We use

a. Gradient from upper left to lower right

b. Colors are: 0-25% is #7ed047, 25%-50% is #4ea018, 50%-75% is # 7ed047, 75%-100% is #4ea018

c, the size of the background is 40px 40px. This setting can exceed the height. The larger the value, the wider the width of the article

Analysis chart:

The setting principle is as shown in the picture above. At the same time, the larger the background width can be set, the larger the text width will be;

3. Set Js and create a LoadBar object

 function LoadingBar(id)
        {
            this.loadbar = $("#" + id);
            this.percentEle = $(".percent", this.loadbar);
            this.percentNumEle = $(".percentNum", this.loadbar);
            this.max = 100;
            this.currentProgress = 0;
        }
        LoadingBar.prototype = {
            constructor: LoadingBar,
            setMax: function (maxVal)
            {
                this.max = maxVal;
            },
            setProgress: function (val)
            {
                if (val >= this.max)
                {
                    val = this.max;
                }
                this.currentProgress = parseInt((val / this.max) * 100) + "%";
                this.percentEle.width(this.currentProgress);
                this.percentNumEle.text(this.currentProgress);


            }
        };

We created a LoadBar object and exposed two methods, one to set the maximum progress and the other to set the current progress; for example, the maximum progress of downloading a file is the file size, and the current progress is the size of the downloaded file.

4. Test

Finally we test our code:

   $(function ()
        {

            var loadbar = new LoadingBar("loadBar01");
            var max = 1000;
            loadbar.setMax(max);
            var i = 0;
            var time = setInterval(function ()
            {
                loadbar.setProgress(i);
                if (i == max)
                {
                    clearInterval(time);
                    return;
                }
                i += 10;
            }, 40);
        });

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