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js to implement custom dragging progress bar effect (code example)

青灯夜游Original: 2018-09-20 16:02:555658browse

How to make a draggable progress bar? This chapter brings you js to implement a customized drag progress bar effect (code example). It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

Let’s take a look at the renderings first:

The example code is divided into three parts:

HTML part:

<body>
    <div id="demo">

        <div class="progress">
            <div class="progress-bar">
                <div class="progress-thumb"></div>
            </div>
        </div>

    </div>
</body>

css part:

#demo { 
    width: 600px; height: 100px; margin: 100px auto; 
    display: flex; align-items: center; 
}

#demo .progress { 
    width: 100%; height: 6px; border-radius: 3px; 
    background: #F1F5FD; 
}

#demo .progress .progress-bar { 
    width: 40%; height: 100%; border-radius: 3px; 
    background: #0072FF; 
}

#demo .progress .progress-bar .progress-thumb { 
    width: 14px; height: 14px; border-radius: 50%; 
    background: #FFFFFF; box-shadow: 0 0 15px 5px #0072FF; 
    float: right; 
    position: relative; left: 7px; top: -5px; 
}

At this point, the custom style has been basically implemented. You only need to change the width of .progress-bar to display different progress; next, add Drag event

JavaScript part:

<script>
           
        var slider = {
            use: function(id) {
                var self = this;
                self.slider = document.getElementById(id);
                self.bar = self.slider.querySelector(&#39;.progress-bar&#39;);
                self.thumb = self.slider.querySelector(&#39;.progress-thumb&#39;);
                self.slider.addEventListener(&#39;mousedown&#39;, function(e) {
                    if (e.button == 0) { // 判断点击左键
                        self.mDown = true;
                        self.beginX = e.offsetX;
                        self.positionX = e.offsetX;
                        self.beginClientX = e.clientX;
                        self.sliderLong = parseInt(self.getStyle(self.slider, &#39;width&#39;));
                        var per = parseInt(self.positionX / self.sliderLong * 100);
                        self.bar.style.width = per + &#39;%&#39;;
                    }
                });
                document.addEventListener(&#39;mousemove&#39;, function(e) {
                    if (self.mDown) {
                        var moveX = e.clientX - self.beginClientX;
                        self.positionX = (self.beginX + moveX > self.sliderLong) ? self.sliderLong : (self.beginX + moveX < 0) ? 0 : self.beginX + moveX;
                        var per = parseInt(self.positionX / self.sliderLong * 100);
                        self.bar.style.width = per + &#39;%&#39;;
                    }
                });
                document.addEventListener(&#39;mouseup&#39;, function(e) {
                    if (e.button == 0) { 
                        self.mDown = false;
                    }
                });
            },
            getStyle: function(obj,styleName){ // 获取元素样式的方法
                if(obj.currentStyle){
                    return obj.currentStyle[styleName];
                }else{
                    return getComputedStyle(obj,null)[styleName];
                }
            }
        };
        slider.use(&#39;demo&#39;);

    </script>

Instructions:

1. Bind the mousedown event to the wrapping layer of the progress bar instead of the progress bar itself. It is a design based on the effects of mainstream video players in order to optimize the user experience;

2. JS is written in pure native syntax. If you use JQuery, it can simplify the acquisition of selectors and CSS styles;

3. The mouse movement outside the scroll bar is calculated using clientX.

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