javascript - BootStrap 进度条上显示不到 1%

Question

我使用 Bootstrap 进度条来显示某人行驶的里程数在 23,872 英里总数中的百分比。

例如，如果用户 A 仅行驶了 5 英里，这意味着:

5/23872 = 0.00020945 * 100 = 0.02094504 英里。

目前进度条上不会显示任何低于 1% 的内容。

是否可以显示低于 1 条的里程百分比，使其仅在上图中的 28% 处亮起绿色。

转换代码:

// Calculating Percentages for each region
var ukPercent = $scope.ukTotal / 23872;
var apacPercent = $scope.apacTotal / 23872;
var naPercent = $scope.naTotal / 23872;

$scope.ukPercentage = ukPercent * 100;
$scope.naPercentage = naPercent * 100;
$scope.apacPercentage = apacPercent * 100;

Answer 1

如果你不关心比 1% 少多少，那么使用 Math.max() 怎么样？从百分之一开始，然后开始取得有意义的进展。

堆栈片段中的演示

var $traveled = $("#traveledMiles"),
    $total = $("#totalMiles"),
    $progressBar = $('.progress-bar');

$($traveled).add($total).keyup(function(){

  var percent = $traveled.val() / $total.val() * 100;

  // at least 1%
  percent = Math.max(percent,1);

  $progressBar
    .css('width', percent+'%')
    .attr('aria-valuenow', percent)
    .children(".sr-only").html(percent+'%'); 

}).keyup();

<link href="//cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.2/css/bootstrap.css" rel="stylesheet"/>

<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.2/js/bootstrap.js"></script>


<div class="form-group">
  <label for="traveledMiles">Traveled Miles</label>
  <input type="text" class="form-control" id="traveledMiles"
         placeholder="Enter Traveled Miles" value="5">
</div>
<div class="form-group">
  <label for="totalMiles">Total Miles</label>
  <input type="text" class="form-control" id="totalMiles" 
         placeholder="Enter Total Miles" value="23872">
</div>

<div class="progress">
  <div class="progress-bar" role="progressbar"  style="width: 60%;"
       aria-valuenow="60" aria-valuemin="0" aria-valuemax="100">
    <span class="sr-only">60%</span>
  </div>
</div>

既然你有标签，你甚至可以关注Bootstrap's suggestion :

To ensure that the label text remains legible even for low percentages, consider adding a min-width to the progress bar.

像这样:

<div class="progress-bar" style="min-width: 2em;">

var $traveled = $("#traveledMiles"),
    $total = $("#totalMiles"),
    $progressBar = $('.progress-bar');

$($traveled).add($total).keyup(function(){

  var percent = $traveled.val() / $total.val() * 100;

  // at least 1%
  percent = Math.max(percent,1);
  
  // round off decimals
  percent = Math.round(percent);
  
  // max of 100%
  percent = Math.min(percent,100);

  $progressBar
    .css('width', percent+'%')
    .attr('aria-valuenow', percent)
    .html(percent+'%'); 

}).keyup();

<link href="//cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.2/css/bootstrap.css" rel="stylesheet"/>

<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.2/js/bootstrap.js"></script>


<div class="form-group">
  <label for="traveledMiles">Traveled Miles</label>
  <input type="text" class="form-control" id="traveledMiles"
         placeholder="Enter Traveled Miles" value="5">
</div>
<div class="form-group">
  <label for="totalMiles">Total Miles</label>
  <input type="text" class="form-control" id="totalMiles" 
         placeholder="Enter Total Miles" value="23872">
</div>

<div class="progress">
  <div class="progress-bar" role="progressbar"  style="min-width: 2em;width: 60%;"
       aria-valuenow="60" aria-valuemin="0" aria-valuemax="100">
    60%
  </div>
</div>