@limetech/mdc-textfield

Text Field

Text fields allow users to input, edit, and select text.

Design & API Documentation

• Material Design guidelines: Text Fields
• Demo

Installation

npm install @limetech/mdc-textfield

Basic Usage

HTML Structure

<div class="mdc-text-field">
  <input type="text" id="my-text-field" class="mdc-text-field__input">
  <label class="mdc-floating-label" for="my-text-field">Hint text</label>
  <div class="mdc-line-ripple"></div>
</div>

NOTE: For more details, see MDC Line Ripple and MDC Floating Label.

Styles

@import "@limetech/mdc-textfield/mdc-text-field";

JavaScript Instantiation

import {MDCTextField} from '@limetech/mdc-textfield';

const textField = new MDCTextField(document.querySelector('.mdc-text-field'));

See Importing the JS component for more information on how to import JavaScript.

Variants

Full Width

Full width text fields are useful for in-depth tasks or entering complex information.

<div class="mdc-text-field mdc-text-field--fullwidth">
  <input class="mdc-text-field__input"
         type="text"
         placeholder="Full-Width Text Field"
         aria-label="Full-Width Text Field">
</div>

NOTE: Do not use mdc-text-field--outlined to style a full width text field.

NOTE: Do not use mdc-floating-label within mdc-text-field--fullwidth. Labels should not be included as part of the DOM structure of a full width text field.

Textarea

<div class="mdc-text-field mdc-text-field--textarea">
  <textarea id="textarea" class="mdc-text-field__input" rows="8" cols="40"></textarea>
  <div class="mdc-notched-outline">
    <div class="mdc-notched-outline__leading"></div>
    <div class="mdc-notched-outline__notch">
      <label for="textarea" class="mdc-floating-label">Textarea Label</label>
    </div>
    <div class="mdc-notched-outline__trailing"></div>
  </div>
</div>

Outlined

<div class="mdc-text-field mdc-text-field--outlined">
  <input type="text" id="tf-outlined" class="mdc-text-field__input">
  <div class="mdc-notched-outline">
    <div class="mdc-notched-outline__leading"></div>
    <div class="mdc-notched-outline__notch">
      <label for="tf-outlined" class="mdc-floating-label">Your Name</label>
    </div>
    <div class="mdc-notched-outline__trailing"></div>
  </div>
</div>

See here for more information on using the notched outline sub-component.

NOTE: Do not use mdc-line-ripple inside of mdc-text-field if you plan on using mdc-text-field--outlined. Line Ripple should not be included as part of the DOM structure of an outlined text field.

Disabled

To disable the text field, add the disabled attribute to the <input> element and add the mdc-text-field--disabled class to the mdc-text-field element.

<div class="mdc-text-field mdc-text-field--disabled">
  <input type="text" id="disabled-text-field" class="mdc-text-field__input" disabled>
  <label class="mdc-floating-label" for="disabled-text-field">Disabled text field</label>
  <div class="mdc-line-ripple"></div>
</div>

Text Field without label

A text field doesn’t require a label if a separate but clear label indicator is already displayed adjacent to the text field. Add class name mdc-text-field--no-label and remove the label element from the structure.

Filled

<div class="mdc-text-field mdc-text-field--no-label">
  <input type="text" class="mdc-text-field__input" placeholder="Placeholder text" aria-label="Label">
  <div class="mdc-line-ripple"></div>
</div>

Outlined

<div class="mdc-text-field mdc-text-field--outlined mdc-text-field--no-label">
  <input type="text" class="mdc-text-field__input" aria-label="Label">
  <div class="mdc-notched-outline">
    <div class="mdc-notched-outline__leading"></div>
    <div class="mdc-notched-outline__trailing"></div>
  </div>
</div>

Textarea

<div class="mdc-text-field mdc-text-field--textarea mdc-text-field--no-label">
  <textarea class="mdc-text-field__input" rows="8" cols="40" aria-label="Label"></textarea>
  <div class="mdc-notched-outline">
    <div class="mdc-notched-outline__leading"></div>
    <div class="mdc-notched-outline__trailing"></div>
  </div>
</div>

Text Field with Helper Text

The helper text provides supplemental information and/or validation messages to users. It appears on input field focus and disappears on input field blur by default, or it can be persistent. Helper text should be rendered inside .mdc-text-field-helper-line element which is immediate sibling of .mdc-text-field. See here for more information on using helper text.

<div class="mdc-text-field">
  <input type="text" id="my-text-field" class="mdc-text-field__input">
  <label class="mdc-floating-label" for="my-text-field">My Label</label>
  <div class="mdc-line-ripple"></div>
</div>
<div class="mdc-text-field-helper-line">
  <div class="mdc-text-field-helper-text">helper text</div>
</div>

Text Field with Character Counter

Character counter is used if there is a character limit. It displays the ratio of characters used and the total character limit. Character counter should be rendered inside .mdc-text-field-helper-line element which is immediate sibling of .mdc-text-field. See here for more information on using character counter.

<div class="mdc-text-field">
  <input type="text" id="my-text-field" class="mdc-text-field__input" maxlength="10">
  <label class="mdc-floating-label" for="my-text-field">My Label</label>
  <div class="mdc-line-ripple"></div>
</div>
<div class="mdc-text-field-helper-line">
  <div class="mdc-text-field-character-counter">0 / 10</div>
</div>

Multi-line Text Field (Textarea) with Character Counter

The layout structure of character counter for multi-line text field (textarea) is slightly different since it is rendered inside of text field component.

<div class="mdc-text-field mdc-text-field--textarea">
  <div class="mdc-text-field-character-counter">0 / 140</div>
  <textarea id="textarea" class="mdc-text-field__input" rows="8" cols="40" maxlength="140"></textarea>
  <div class="mdc-notched-outline">
    <div class="mdc-notched-outline__leading"></div>
    <div class="mdc-notched-outline__notch">
      <label for="textarea" class="mdc-floating-label">Textarea Label</label>
    </div>
    <div class="mdc-notched-outline__trailing"></div>
  </div>
</div>

Helper text and Character counter are optional subcomponents of text field that can co-exist independently. It is recommended that .mdc-text-field and .mdc-text-field-helper-line elements have same width for correct layout.

Text Field with Leading and Trailing Icons

Leading and trailing icons can be added within the default or outlined variant of MDC Text Field as visual indicators as well as interaction targets. See here for more information on using icons.

HTML5 Validation

MDCTextFieldFoundation provides validity styling by using the :invalid and :required attributes provided by HTML5's form validation API.

<div class="mdc-text-field">
  <input type="password" id="pw" class="mdc-text-field__input" required minlength=8>
  <label for="pw" class="mdc-floating-label">Password</label>
  <div class="mdc-line-ripple"></div>
</div>

MDCTextFieldFoundation automatically appends an asterisk to the label text if the required attribute is set.

Pre-filled

When dealing with JS-driven text fields that already have values, you'll want to ensure that you render mdc-floating-label with the mdc-floating-label--float-above modifier class. This will ensure that the label moves out of the way of the text field's value and prevents a Flash Of Un-styled Content (FOUC).

<div class="mdc-text-field">
  <input type="text" id="pre-filled" class="mdc-text-field__input" value="Pre-filled value">
  <label class="mdc-floating-label mdc-floating-label--float-above" for="pre-filled">
    Label in correct place
  </label>
  <div class="mdc-line-ripple"></div>
</div>

Style Customization

CSS Classes

CSS Class	Description
mdc-text-field	Mandatory.
mdc-text-field--outlined	Styles the text field as an outlined text field.
mdc-text-field--fullwidth	Styles the text field as a full width text field.
mdc-text-field--textarea	Indicates the text field is a <textarea>.
mdc-text-field--disabled	Styles the text field as a disabled text field.
mdc-text-field--dense	Styles the text field as a dense text field.*
mdc-text-field--with-leading-icon	Styles the text field as a text field with a leading icon.
mdc-text-field--with-trailing-icon	Styles the text field as a text field with a trailing icon.
mdc-text-field--focused	Styles the text field as a text field in focus.
mdc-text-field--no-label	Styles the text field that has no label.
mdc-text-field-helper-line	Styles the container of helper text and character counter elements.

Deprecation Notice

*The --dense variant of the text field will be removed in an upcoming release. See github issue for details.

Sass Mixins

To customize the colors of any part of the text-field, use the following mixins. We recommend you apply these mixins within CSS selectors like .foo-text-field:not(.mdc-text-field--focused) to select your unfocused text fields, and .foo-text-field.mdc-text-field--focused to select your focused text-fields. To change the invalid state of your text fields, apply these mixins with CSS selectors such as .foo-text-field.mdc-text-field--invalid.

NOTE: the mdc-line-ripple-color mixin should be applied from the not focused class foo-text-field:not(.mdc-text-field--focused)).

Mixins for all Text Fields

Mixin	Description
mdc-text-field-ink-color($color)	Customizes the color of the text entered into the text field.
mdc-text-field-label-color($color)	Customizes the text color of the label.
mdc-text-field-caret-color($color)	Customizes the color of the cursor caret of the text field.

Mixins for Filled Text Field

Mixin	Description
mdc-text-field-shape-radius($radius, $rtl-reflexive)	Sets rounded shape to boxed text field variant with given radius size. Set $rtl-reflexive to true to flip radius values in RTL context, defaults to false.
mdc-text-field-fill-color($color)	Customizes the background color of the text field.
mdc-text-field-bottom-line-color($color)	Customizes the text field bottom line color except the outlined and textarea variants.
mdc-text-field-hover-bottom-line-color($color)	Customizes the hover text field bottom line color except the outlined and textarea variants.
mdc-text-field-line-ripple-color($color)	Customizes the color of the default line ripple of the text field.
mdc-text-field-density($density-scale)	Sets density scale for default text field variant. Supported density scale values -4, -3, -2, -1, 0.
mdc-text-field-height($height)	Sets height of default text field variant.

Mixins for Outlined Text Field

Mixin	Description
mdc-text-field-focused-outline-color($color)	Customizes the outline border color when the text field is focused.
mdc-text-field-hover-outline-color($color)	Customizes the outline border color when the text field is hovered.
mdc-text-field-outline-color($color)	Customizes the border color of the outlined text field.
mdc-text-field-outline-shape-radius($radius, $rtl-reflexive)	Sets rounded shape to outlined text field variant with given radius size. Set $rtl-reflexive to true to flip radius values in RTL context, defaults to false.
mdc-text-field-outlined-density($density-scale)	Sets density scale for outlined text field (Excluding outlined text field with leading icon). Supported density scale values -4, -3, -2, -1, 0.
mdc-text-field-outlined-height($height)	Sets height of outlined text field variant (Excluding outlined text field with leading icon).
mdc-text-field-outlined-with-leading-icon-density($density-scale)	Sets density scale for outlined text field with leading icon. Supported density scale values -4, -3, -2, -1, 0.
mdc-text-field-outlined-with-leading-icon-height($height)	Sets height of outlined text field with leading icon variant.

Mixins for Textarea

Mixin	Description
mdc-text-field-textarea-shape-radius($radius, $rtl-reflexive)	Sets rounded shape to text area variant with given radius size. Set $rtl-reflexive to true to flip radius values in RTL context, defaults to false.
mdc-text-field-textarea-fill-color($color)	Customizes the color of the background of the textarea.
mdc-text-field-textarea-stroke-color($color)	Customizes the color of the border of the textarea.

Mixins for Text Field Fullwidth

Mixin	Description
mdc-text-field-fullwidth-bottom-line-color($color)	Customizes the fullwidth text field variant bottom line color.

MDCTextField Properties and Methods

Property	Value Type	Description
value	string	Proxies to the foundation's getValue/setValue methods.
disabled	boolean	Proxies to the foundation's isDisabled/setDisabled methods.
useNativeValidation	boolean (write-only)	Proxies to the foundation's setUseNativeValidation method.
valid	boolean	Proxies to the foundation's isValid/setValid methods.
helperTextContent	string (write-only)	Proxies to the foundation's setHelperTextContent method when set.
ripple	MDCRipple (write-only)	The MDCRipple instance for the root element that MDCTextField initializes; this only applies to the default Text Field, and is null for other variants.
leadingIconAriaLabel	string (write-only)	Proxies to the foundation's setLeadingIconAriaLabel method.
trailingIconAriaLabel	string (write-only)	Proxies to the foundation's setTrailingIconAriaLabel method.
leadingIconContent	string (write-only)	Proxies to the foundation's setLeadingIconContent method.
trailingIconContent	string (write-only)	Proxies to the foundation's setTrailingIconContent method.

In addition to the above, the following properties proxy to the input element's properties of the same name:

• required
• pattern
• minLength
• maxLength
• min
• max
• step

Method Signature	Description
focus() => void	Focuses the input or textarea element.
layout() => void	Adjusts the dimensions and positions for all sub-elements.

Usage Within Frameworks

If you are using a JavaScript framework, such as React or Angular, you can create a Text Field for your framework. Depending on your needs, you can use the Simple Approach: Wrapping MDC Web Vanilla Components, or the Advanced Approach: Using Foundations and Adapters. Please follow the instructions here.

MDCTextFieldAdapter

Method Signature	Description
addClass(className: string) => void	Adds a class to the root element.
removeClass(className: string) => void	Removes a class from the root element.
hasClass(className: string) => boolean	Returns true if the root element contains the given class name.
registerTextFieldInteractionHandler(evtType: string, handler: EventListener) => void	Registers an event handler on the root element for a given event.
deregisterTextFieldInteractionHandler(evtType: string, handler: EventListener) => void	Deregisters an event handler on the root element for a given event.
registerInputInteractionHandler(evtType: string, handler: EventListener) => void	Registers an event listener on the native input element for a given event.
deregisterInputInteractionHandler(evtType: string, handler: EventListener) => void	Deregisters an event listener on the native input element for a given event.
registerValidationAttributeChangeHandler(handler: (attributeNames: string[]) => void) => MutationObserver	Registers a validation attribute change listener on the input element. Handler accepts list of attribute changes.
deregisterValidationAttributeChangeHandler(!MutationObserver) => void	Disconnects a validation attribute observer on the input element.
getNativeInput() => NativeInputType | null	Returns an object representing the native text input element, with a similar API shape. See types.ts.
isFocused() => boolean	Returns whether the input is focused.
shakeLabel(shouldShake: boolean) => void	Shakes the label to indicate an invalid input value.
floatLabel(shouldFloat: boolean) => void	Floats the label.
hasLabel() => boolean	Determines whether the text field has a label element.
getLabelWidth() => number	Returns the width of the label element in px.
activateLineRipple() => void	Activates the text field's line ripple sub-element.
deactivateLineRipple() => void	Deactivate the text field's line ripple sub-element.
setLineRippleTransformOrigin(normalizedX: number) => void	Sets the CSS transform-origin property to the given value on the text field's line ripple sub-element (if present).
hasOutline() => boolean	Determines whether the text field has an outline sub-element.
notchOutline(labelWidth: number) => void	Sets the width of the text field's notched outline sub-element.
closeOutline() => void	Closes the text field's notched outline sub-element.

MDCTextFieldAdapter.getNativeInput()

Returns an object representing the native text input element, with a similar API shape. We never alter the value within our code, however we do update the disabled property, so if you choose to duck-type the return value for this method in your implementation it's important to keep this in mind. Also note that this method can return null, which the foundation will handle gracefully.

MDCTextFieldAdapter.getIdleOutlineStyleValue(propertyName: string)

Returns the idle outline element's computed style value of the given css property propertyName. The vanilla implementation achieves this via getComputedStyle(...).getPropertyValue(propertyName).

MDCTextFieldFoundation

Property	Value Type	Description
shouldFloat	boolean (read-only)	Determines whether the label should float.
shouldShake	boolean (read-only)	Determines whether the label should shake.

Method Signature	Description
getValue() => string	Returns the input's value.
setValue(value: string)	Sets the input's value.
setUseNativeValidation(useNativeValidation: boolean)	Sets whether to check native HTML validity state (true, default) or custom validity state when updating styles (false).
setValid(isValid: boolean)	Sets custom validity and updates styles accordingly. Note that native validation will still be honored subsequently unless setUseNativeValidation(false) is also called.
isValid() => boolean	Returns the component's current validity state (either native or custom, depending on how setUseNativeValidation() was configured).
isDisabled() => boolean	Returns whether or not the input is disabled.
setDisabled(disabled: boolean) => void	Updates the input's disabled state.
handleTextFieldInteraction(evt: Event) => void	Handles click and keydown events originating from inside the Text Field component.
handleInput() => void	Handles text input and textarea input event.
handleValidationAttributeChange(attributesList: !Array<string>) => void	Handles validation attribute changes.
activateFocus() => void	Activates the focus state of the Text Field. Normally called in response to the input focus event.
deactivateFocus() => void	Deactivates the focus state of the Text Field. Normally called in response to the input blur event.
setHelperTextContent(content: string) => void	Sets the content of the helper text.
setLeadingIconAriaLabel(label: string) => void	Sets the aria label of the leading icon.
setLeadingIconContent(content: string) => void	Sets the text content of the leading icon.
setTrailingIconAriaLabel(label: string) => void	Sets the aria label of the trailing icon.
setTrailingIconContent(content: string) => void	Sets the text content of the trailing icon.
notchOutline(openNotch: boolean) => void	Opens/closes the notched outline.
setTransformOrigin(evt: TouchEvent | MouseEvent) => void	Sets the line ripple's transform origin, so that the line ripple activate animation will animate out from the user's click location.
autoCompleteFocus() => void	Activates the Text Field's focus state in cases when the input value is changed programmatically (i.e., without user action).

MDCTextFieldFoundation supports multiple optional sub-elements: helper text and icon. The foundations of these sub-elements must be passed in as constructor arguments to MDCTextFieldFoundation.