jQuery 显示时间倒计时进度条

Showing a time countdown progress bar

提问by Elton

I came across this progress bar code on this site.

我在这个网站上遇到了这个进度条码。

What I want to do is, have a 3 minute countdown and show how many minutes and seconds are left. So rather than displaying percentage I want to display time left.

我想要做的是，倒计时 3 分钟并显示还剩多少分钟和秒。因此，我想显示剩余时间而不是显示百分比。

I use the following code:

我使用以下代码：

JS

JS

progress(100, $('#progressBar')); // This is what the timer should update each second

function progress(percent, $element) {
    var progressBarWidth = percent * $element.width() / 100;
    $element.find('div').animate({ width: progressBarWidth }, 500).html(percent + " minutes/seconds to go");
};

HTML

HTML

<div id="progressBar">
  <div></div>
</div>

CSS

CSS

 #progressBar {
  width: 923px;
  margin: 10px auto;
  height: 22px;
  background-color: #0A5F44;
}

#progressBar div {
  height: 100%;
  text-align: right;
  padding: 0 10px;
  line-height: 22px; /* same as #progressBar height if we want text middle aligned */
  width: 0;
  background-color: #CBEA00;
}

回答by zessx

You'll need to change a bit this function :

您需要稍微更改此功能：

• Use 3 parameters (timeleft, timetotal, element) instead of the 2 actual
• Use setTimeout()to refresh your progress bar every second
• Check timeleftto know if you needto refresh the progress bar

• 使用 3 个参数 ( timeleft, timetotal, element) 而不是 2 个实际参数
• 用于setTimeout()每秒刷新进度条
• 查看timeleft是否需要刷新进度条

function progress(timeleft, timetotal, $element) {
    var progressBarWidth = timeleft * $element.width() / timetotal;
    $element
        .find('div')
        .animate({ width: progressBarWidth }, 500)
        .html(timeleft + " seconds to go");
    if(timeleft > 0) {
        setTimeout(function() {
            progress(timeleft - 1, timetotal, $element);
        }, 1000);
    }
};

progress(180, 180, $('#progressBar'));

Plus, you should add this CSS, to avoid your progress bar to overflow its container :

另外，您应该添加此 CSS，以避免进度条溢出其容器：

#progressBar div {
  box-sizing: border-box;
}

Snippet:

片段：

function progress(timeleft, timetotal, $element) {
    var progressBarWidth = timeleft * $element.width() / timetotal;
    $element.find('div').animate({ width: progressBarWidth }, 500).html(timeleft + " seconds to go");
    if(timeleft > 0) {
        setTimeout(function() {
            progress(timeleft - 1, timetotal, $element);
        }, 1000);
    }
};

progress(180, 180, $('#progressBar'));

#progressBar {
  width: 90%;
  margin: 10px auto;
  height: 22px;
  background-color: #0A5F44;
}

#progressBar div {
  height: 100%;
  text-align: right;
  padding: 0 10px;
  line-height: 22px; /* same as #progressBar height if we want text middle aligned */
  width: 0;
  background-color: #CBEA00;
  box-sizing: border-box;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="progressBar">
  <div></div>
</div>

[Tip]

[提示]

If you want your progress bar to smoothly and constantly decrease, use this code instead :

如果您希望进度条平稳并不断减少，请改用以下代码：

.animate({ width: progressBarWidth }, timeleft == timetotal ? 0 : 1000, "linear")