How to implement colorful ring countdown using SVG

This time I will show you how to start a colorful ring countdown using SVG. How to use SVG to realize a colorful ring countdown? What are the precautions for implementing colorful ring countdown with SVG? The following is a practical case, let’s take a look.

We often see ring countdowns, and there are many ways to implement them. But this article will introduce a new implementation method, using SVG to implement the countdown function.

SVG countdown case

The following is the relevant implementation code. The css implementation code is as follows:

svg {
    transform: rotate(-0.05deg);
}
circle {
    transition: stroke-dasharray .2s;
}
.time-count-x {
    line-height: 1.5;
    position: relative;
}
.time-second {
    position: absolute;
    top: 50%; left: 0; right: 0;
    margin-top: -.75em;
    text-align: center;
    font-size: 100px;
}

The relevant html code is as follows:

<div id="timeCountX" class="time-count-x">
    <svg width="440" height="440" viewBox="0 0 440 440" class="center">
        <defs>
            <linearGradient x1="1" y1="0" x2="0" y2="0" id="gradient1">
                <stop offset="0%" stop-color="#e52c5c"></stop>
                <stop offset="100%" stop-color="#ab5aea"></stop>
            </linearGradient>
           <linearGradient x1="1" y1="0" x2="0" y2="0" id="gradient2">
                <stop offset="0%" stop-color="#4352f3"></stop>
                <stop offset="100%" stop-color="#ab5aea"></stop>
            </linearGradient>
        </defs>
        <g transform="matrix(0,-1,1,0,0,440)">
            <circle cx="220" cy="220" r="170" stroke-width="50" stroke="#f0f1f5" fill="none" stroke-dasharray="1069 1069"></circle>
            <circle cx="220" cy="220" r="170" stroke-width="50" stroke="url(&#39;#gradient1&#39;)" fill="none" stroke-dasharray="1069 1069"></circle>
            <circle cx="220" cy="220" r="170" stroke-width="50" stroke="url(&#39;#gradient2&#39;)" fill="none" stroke-dasharray="534.5 1069"></circle>
        </g>
    </svg>
    <span id="timeSecond" class="time-second"></span>
</div>

Finally, the relevant JavaScript code:

var eleCircles=document.querySelectorAll("#timeCountX circle");
var eleTimeSec=document.getElementById("timeSecond");
var perimeter=Math.PI*2*170;
var circleInit=function(){
    if(eleCircles[1]){
        eleCircles[1].setAttribute("stroke-dasharray","1069 1069")
    }
    if(eleCircles[2]){
        eleCircles[2].setAttribute("stroke-dasharray",perimeter/2+" 1069")
    }
    eleTimeSec.innerHTML=""
};
var timerTimeCount=null;
var fnTimeCount=function(b){
    if(timerTimeCount){
        return
    }
    var b=b||10;
    var a=function(){
        var c=b/10;
        if(eleCircles[1]){
            eleCircles[1].setAttribute("stroke-dasharray",perimeter*c+" 1069")
        }
        if(eleCircles[2]&&b<=5){
            eleCircles[2].setAttribute("stroke-dasharray",perimeter*c+" 1069")
        }
        if(eleTimeSec){
            eleTimeSec.innerHTML=b
        }
        b--;
        if(b<0){
            clearInterval(timerTimeCount);
            timerTimeCount=null;
            alert("时间到！");
            circleInit()
        }
    };
    a();
    timerTimeCount=setInterval(a,1000)
};
fnTimeCount();

I believe you have read these cases After mastering the method, please pay attention to other related articles on the php Chinese website for more exciting content!

Related reading:

Summary of all elements and basic syntax of H5

How to operate indexedDB in html5

About how to handle old versions of browsers that are not compatible with H5 and C3

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