Implementation of HTML5+CSS3 web page loading progress bar, download progress bar

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 a task freezes, close the application without hesitation; generally used for downloading tasks, deleting a large number of tasks, loading web pages, etc.; if HTML5 is used for mobile phone layout, it can also be used on mobile phones~

Rendering:

1. HTML structure:

##

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

Brief 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 width), p.loadBar p span i fills the background color for the progress (i.e. width=100%)

HTML structure, you can design it yourself, 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, the gradient from the upper left to the lower right,

b, and the color They are: 0-25% is #7ed047, 25%-50% is #4ea018, 50%-75% is #7ed047, 75%-100% is #4ea018

c, and the background size is 40px 40px is sufficient if the setting exceeds the height. The larger it is, the wider the width of the article

Analysis diagram:

The setting principle is as shown in the picture above, and the background width can also be used The larger the setting, the larger the width of the article;

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 create A LoadBar object is created and two methods are exposed at the same time, 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);  
     });

Click for source code Download: demo

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