Accessibility in EJ2 TypeScript Range slider control

15 May 20237 minutes to read

The Slider is characterized with complete ARIA Accessibility support that helps to access by on-screen readers and other assistive technology devices. This control is designed with the reference of guidelines document given in the WAI ARAI Accessibility Practices.

The Slider control uses the Slider role and the following ARIA properties for its element based on the state.

Property Functionalities
aria-valuenow It Indicates the current value of the slider.
aria-valuetext Returns the current text of the slider.
aria-valuemin It Indicates the Minimum value of the slider.
aria-valuemax It Indicates the Maximum value of the slider.
aria-orientation It Indicates the Slider Orientation.
aria-label Slider left and right button label text (increment and decrement).
aria-labelledby It indicates the name of the Slider.

Keyboard interaction

The Keyboard interaction of the Slider control is designed based on the WAI-ARIA Practices described for Slider. Users can use the following shortcut keys to interact with the Slider.

Keyboard shortcuts Actions
Right Arrow   |   Up Arrow Increase the Slider value.
Left Arrow   |   Down Arrow Decrease the Slider value.
Home Moves to the start value (for Range Slider when the second thumb is focused and the Home key is pressed, it moves to the first thumb value).
End Moves to the end value (for Range Slider when the first thumb is focused and the End key is pressed, it moves to the second thumb value).
Page Up Increases the Slider by `largeStep` value.
Page Down Decreases the Slider by `largeStep` value. 
import { Slider, SliderTooltipEventArgs, SliderTickEventArgs } from "@syncfusion/ej2-inputs";

// Initialize Slider component
let minRangeObj: Slider = new Slider({
  ticks: {
    placement: "After",
    largeStep: 20,
    smallStep: 10,
    showSmallTicks: true
  },
  tooltip: { placement: "Before", isVisible: true, showOn: "Always" },
  value: 30,
  step: 10,
  type: "MinRange",
  showButtons: true
});
// Render initialized Slider
minRangeObj.appendTo("#slider");

let weekdaysObj: Slider = new Slider({
  min: 0,
  max: 6,
  step: 1,
  value: 2,
  // Assigning ticks data
  ticks: {
    placement: "After",
    largeStep: 1
  },
  renderingTicks: function(args: SliderTickEventArgs) {
    // Weekdays Array
    let daysArr: string[] = [
      "Sunday",
      "Monday",
      "Tuesday",
      "Wednesday",
      "Thrusday",
      "Friday",
      "Saturday"
    ];
    // Customizing each ticks text into weeksdays
    args.value = daysArr[parseFloat(args.value as any).toString()];
  },
  // Assigning tooltip data
  tooltip: {
    placement: "Before",
    isVisible: true
  },
  tooltipChange: function(args: SliderTooltipEventArgs) {
    // Customizing tooltip to display the Day (in numeric) of the week
    args.text = "Day " + (Number(args.text) + 1).toString();
  }
});
// Render initialized Slider
weekdaysObj.appendTo("#slider1");
<!DOCTYPE html>
<html lang="en">

<head>
    <title>Essential JS 2 Slider</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Essential JS 2 Slider Component" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
    <link href="https://cdn.syncfusion.com/ej2/23.2.4/ej2-base/styles/material.css" rel="stylesheet" />
    <link href="https://cdn.syncfusion.com/ej2/23.2.4/ej2-inputs/styles/material.css" rel="stylesheet" />
    <link href="https://cdn.syncfusion.com/ej2/23.2.4/ej2-popups/styles/material.css" rel="stylesheet" />
    <link href="https://cdn.syncfusion.com/ej2/23.2.4/ej2-buttons/styles/material.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>

<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
        
        <div class='wrap'>
            <div class='label'>Slider without formatted values</div>
            <div id="slider">
            </div>
        </div>
        
        <div class='wrap'>
            <div class='label'>Slider with formatted values</div>
            <div id="slider1">
            </div>
        </div>
    </div>
</body>

</html>
#container {
  visibility: hidden;
}

#loader {
  color: #008cff;
  font-family: 'Helvetica Neue','calibiri';
  font-size: 14px;
  height: 40px;
  left: 45%;
  position: absolute;
  top: 45%;
  width: 30%;
}

.wrap {
  box-sizing: border-box;
  height: 100px;
  margin: 0 auto;
  padding: 30px 10px;
  width: 460px;
}

.wrap .label {
  text-align: center;
}