如何制作字体大小的自定义范围滑块? [英] How to make a customized range slider for font-size?

问题描述

我有一个场景，我必须使用范围滑块来设置字体大小，但是我有一个普通的滑块，我需要在滑动时在工具提示上显示字体大小.

JS:

  angular.module('textSizeSlider'，[]).directive('textSizeSlider'，['$ document'，function($ document){返回 {限制:"E"，模板:< div class ="text-size-slider">< span class ="small-letter" ng-style ="{fontSize:min + unit}"> A</span>< input type ="range" min ="{{min}}" max ="{{max}}" step ="{{step || 0}}" ng-model ="textSize" class ="slider"value ="{{value}}"/>< span class ="big-letter" ng-style ="{fontSize:max + unit}"> A</span></div>'，范围: {最小值:"@"，最大限度: '@'，单元: '@'，价值: '@'，步: '@'}，链接:函数(作用域，元素，属性){scope.textSize = scope.value;scope.$ watch('textSize'，function(size){$ document [0] .body.style.fontSize =大小+ scope.unit;});}}}]); 

这是pl子链接:

解决方案

您可以添加一个跨度，然后通过将其宽度乘以当前值除以最大值，将其相对于范围滑动器相对移动.

  angular.module('textSizeSlider'，[]).directive('textSizeSlider'，['$ document'，function($ document){var ctrl = ['$ scope'，'$ element'，function($ scope，$ element){$ scope.position = 0;$ scope.updatepointer =()=>{var input = $ element.find("input");var width = input [0] .offsetWidth -16;//16用于补偿填充var ratio =($ scope.textSize-$ scope.min)/($ scope.max-$ scope.min);var position = width * ratio;$ scope.position = Math.trunc(位置);}}]返回 {控制器:Ctrl，限制:"E"，模板:< div class ="text-size-slider">< span class ="pointer" style ="left:{{position}} px;">< span> {{textSize}}</span></span>< span class ="small-letter" ng-style ="{fontSize:min + unit}"> A</span>< input type ="range" min ="{{min}}" max ="{{max}}" step ="{{step || 0}}" ng-model ="textSize" class ="slider"value ="{{value}}" ng-change ="updatepointer()"/>< span class ="big-letter" ng-style ="{fontSize:max + unit}"> A</span></div>'，范围: {最小值:"@"，最大限度: '@'，单元: '@'，价值: '@'，步: '@'}，链接:函数(作用域，元素，属性){scope.textSize = scope.value;scope.$ watch('textSize'，function(size){$ document [0] .body.style.fontSize =大小+ scope.unit;scope.updatepointer();});}}}]); 

我在此处添加了用于指针的css:

  .pointer {高度:40px；宽度:40px；border-radius:20px 20px 0 20px;背景颜色:#FFF;显示:块;变换:rotate(45deg);位置:绝对；顶部:-44px；margin-left:8px;}.pointer span {显示:inline-block;变换:rotate(-45deg);margin-left:12px;边距顶部:14像素;} 

工作的监听器在这里: https://plnkr.co/edit/9bYR1aprS3Xn7YWyB6kj?p=预览

I have a scenario,in that I have to use the range slider for font size,But I have a normal slider,I need to display the font-size on tool-tip when it slides.

JS:

angular.module('textSizeSlider', [])
  .directive('textSizeSlider', ['$document', function ($document) {
    return {
      restrict: 'E',
      template: '<div class="text-size-slider"><span class="small-letter" ng-style="{ fontSize: min + unit }">A</span> <input type="range" min="{{ min }}" max="{{ max }}" step="{{ step || 0 }}" ng-model="textSize" class="slider" value="{{ value }}" /> <span class="big-letter" ng-style="{ fontSize: max + unit }">A</span></div>',
      scope: {
        min: '@',
        max: '@',
        unit: '@',
        value: '@',
        step: '@'
      },
      link: function (scope, element, attr) {
        scope.textSize = scope.value;
        scope.$watch('textSize', function (size) {
          $document[0].body.style.fontSize = size + scope.unit;
        });
      }
    }
  }]);

Here is the plunker link:

https://plnkr.co/edit/uzggs7sVA5KCuuHxQ2Yh?p=preview

Expected result must be shown in below figure:

解决方案

You can add a span and then move it relative to your range slider by taking the width of the slider and multiplying it by the current value divided by the max.

angular.module('textSizeSlider', [])
  .directive('textSizeSlider', ['$document', function ($document) {

    var ctrl = ['$scope', '$element', function ($scope, $element) {
        $scope.position = 0;
        $scope.updatepointer = () => {
          var input =  $element.find("input");
          var width = input[0].offsetWidth -16; // 16 for offsetting padding
          var ratio = ($scope.textSize - $scope.min) / ($scope.max - $scope.min);
          var position = width * ratio;
          $scope.position = Math.trunc(position); 

        }

    }]

    return {
      controller: ctrl,
      restrict: 'E',
      template: '<div class="text-size-slider"><span class="pointer" style="left:{{position}}px;"><span>{{textSize}}</span></span><span class="small-letter" ng-style="{ fontSize: min + unit }">A</span> <input type="range" min="{{ min }}" max="{{ max }}" step="{{ step || 0 }}" ng-model="textSize" class="slider" value="{{ value }}" ng-change="updatepointer()" /> <span class="big-letter" ng-style="{ fontSize: max + unit }">A</span></div>',
      scope: {
        min: '@',
        max: '@',
        unit: '@',
        value: '@',
        step: '@'
      },
      link: function (scope, element, attr) {
        scope.textSize = scope.value;

        scope.$watch('textSize', function (size) {
          $document[0].body.style.fontSize = size + scope.unit;
          scope.updatepointer();
        });
      }
    }
  }]);

I added the css for pointer here:

.pointer {
  height: 40px;
  width: 40px;
  border-radius:20px 20px  0 20px;
  background-color:#FFF;
  display:block;
  transform: rotate(45deg);
  position:absolute;
  top: -44px;
  margin-left:8px;

}

.pointer span {
  display: inline-block;
  transform: rotate(-45deg);
  margin-left:12px;
  margin-top: 14px;


}

The working plunker is here: https://plnkr.co/edit/9bYR1aprS3Xn7YWyB6kj?p=preview

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