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input-numeric.md

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Numeric Inputs

Numeric inputs allow users to input numbers. These include the more generic <d2l-input-number>, as well as the percentage input <d2l-input-percent>.

<script type="module">
  import '@brightspace-ui/core/components/inputs/input-percent.js';
</script>
<style>
  d2l-input-number,
  d2l-input-percent {
    width: unset;
  }
</style>
<d2l-input-number label="Number Input"></d2l-input-number>
<d2l-input-percent label="Percent Input"></d2l-input-percent>

Number Input [d2l-input-number]

The <d2l-input-number> element is similar to <d2l-input-text>, except it's intended for inputting numbers only.

<script type="module">
  import '@brightspace-ui/core/components/inputs/input-number.js';
</script>
<d2l-input-number label="Label"></d2l-input-number>

Properties

Property Type Description
label String, required Explicitly defined label for the element.
autocomplete String Specifies which types of values can be autofilled by the browser.
autofocus Boolean, default: false When set, will automatically place focus on the input.
disabled Boolean, default: false Disables the input.
input-width String, default: 4rem Restricts the maximum width of the input box without restricting the width of the label.
label-hidden Boolean, default: false Hides the label visually. Hidden labels are still read by screen readers so make sure to set an appropriate label.
labelled-by String HTML id of an element in the same shadow root which acts as the input's label
max Number Maximum value allowed.
max-exclusive Boolean, default: false Indicates whether the max value is exclusive.
max-fraction-digits Number, default: Greater of minFractionDigits or 3 Maximum number of digits allowed after the decimal place. Must be between 0 and 20 and greater than or equal to minFractionDigits
min Number Minimum value allowed.
min-exclusive Boolean, default: false Indicates whether the min value is exclusive.
min-fraction-digits Number, default: 0 Minimum number of digits allowed after the decimal place. Must be between 0 and 20 and less than or equal to maxFractionDigits
name String Name of the form control. Submitted with the form as part of a name/value pair.
required Boolean, default: false Indicates that a value is required.
unit String Unit associated with the input value, displayed next to input and announced as part of the label
unit-label String Label for the unit, which is only picked up by screenreaders. Required if unit is used.
value Number Value of the input.

Events

  • change: Dispatched when the value is changed. The value attribute reflects a JavaScript Number which is parsed from the formatted input value.
// fired when value changes are committed
numberInput.addEventListener('change', (e) => {
  console.log(numberInput.value);
});

Slots

  • inline-help: Help text that will appear below the input. Use this only when other helpful cues are not sufficient, such as a carefully-worded label.

Usage

Integers Only:

To accept only integer numbers, set max-fraction-digits to zero:

<d2l-input-number label="Apples" max-fraction-digits="0">
</d2l-input-number>

Percent Input [d2l-input-percent]

The <d2l-input-percent> element is similar to <d2l-input-number>, except it provides a "%" symbol beside the number.

<script type="module">
  import '@brightspace-ui/core/components/inputs/input-percent.js';
</script>
<d2l-input-percent label="Label"></d2l-input-percent>

Properties

Property Type Description
label String, required Explicitly defined label for the element.
autofocus Boolean, default: false When set, will automatically place focus on the input.
disabled Boolean, default: false Disables the input.
input-width String, default: 4rem Restricts the maximum width of the input box without restricting the width of the label.
label-hidden Boolean, default: false Hides the label visually. Hidden labels are still read by screen readers so make sure to set an appropriate label.
max-fraction-digits Number Maximum number of digits allowed after the decimal place.
min-fraction-digits Number Minimum number of digits allowed after the decimal place.
name String Name of the form control. Submitted with the form as part of a name/value pair.
required Boolean, default: false Indicates that a value is required.
value Number Value of the input.

Events

  • change: Dispatched when the value is changed. The value attribute reflects a JavaScript Number which is parsed from the formatted input value.
// fired when value changes are committed
numberInput.addEventListener('change', (e) => {
  console.log(numberInput.value);
});

Slots

  • inline-help: Help text that will appear below the input. Use this only when other helpful cues are not sufficient, such as a carefully-worded label.

Accessibility

  • While unit-label is not mandatory by default, using the unit property makes it a required property
    • This helps provide screenreaders more context and lets you use short forms for unit without risking it being unclear to screenreaders (e.g. unit is 'lbs', but unit-label is 'in pounds' )
  • Despite being a lighter colour than the input text, the unit text still meets the WCAG Minimum Contrast requirement of 4.5:1
  • Neither input component uses the type="number" to denote their numerical nature, so the label must make it clear that numerical input is expected
    • This is because type="number" does not take into consideration localizations, which can cause problems for languages that use a comma as the decimal place instead of a period
    • Using unit-label can greatly help with making the numerical nature of the input explicit