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import { reflectAttribute, normalizeBoolean, normalizeInput, hasSlotText } from 'sds/utils';
import 'sds/privateThemeProvider';
export default class inputRange extends LightningElement {
static shadowSupportMode = 'native';
_value = '50';
_name;
_form;
_helptext;
_max = '100';
_min = '0';
_disabled = false;
_invalid = false;
_labelHidden = false;
_validityMessage;
_inputElement;
_helpTextElement;
_formElement;
@api id = 'input';
@api label = 'Input Range Label';
/**
* The value of the input element
* Value attribute is removed from custom element and delegated to the input element
*
* @type {string}
*/
@api
get value() {
return this._value;
}
set value(value) {
this._value = normalizeInput(value);
}
/**
* Makes the element not mutable, interactable, or focusable.
*
* @type {boolean}
* @default false
*/
@api
get disabled() {
return this._disabled;
}
set disabled(value) {
this._disabled = normalizeBoolean(value);
reflectAttribute(this, 'disabled', this._disabled);
}
/**
* The name of the input element, used on form submit.
* Name attribute is removed from custom element and delegated to the input element
*
* @type {string}
*/
@api
get name() {
return this._name;
}
set name(value) {
this._name = normalizeInput(value);
}
/**
* Visually hides the label.
* @type {boolean}
*/
@api
get labelHidden() {
return this._labelHidden;
}
set labelHidden(value) {
this._labelHidden = normalizeBoolean(value);
reflectAttribute(this, 'label-hidden', this._labelHidden);
}
/**
* Specifies the id of a form to associate the input with (that is, its form owner).
* This attribute lets you place an input anywhere in the document but have it included with a form elsewhere in the document.
* It can also override the form's action attribute.
* Form attribute is removed from custom element and delegated to the input element
*
* @type {string}
*/
@api
get form() {
return this._form;
}
set form(value) {
this._form = normalizeInput(value);
}
/**
* Specifies the minimum number allowed in the input.
* Min attribute is removed from custom element and delegated to the input element
*
* @type {string}
*/
@api
get min() {
return this._min;
}
set min(value) {
this._min = normalizeInput(value);
}
/**
* Specifies the maximum number allowed in the input.
* Max attribute is removed from custom element and delegated to the input element
*
* Current bug with LWC does not allow for max, seems like its a reserved attribute of the compiler
*
* @type {string}
*/
@api
get max() {
return this._max;
}
set max(value) {
this._max = normalizeInput(value);
}
/**
* Number that specifies the granularity that the value must adhere to.
*
* @type {string}
*
*/
@api
get step() {
return this._step;
}
set step(value) {
this._step = normalizeInput(value);
}
/**
* Allows customer to set invalid state on input
* An example would be if the input is required and the value is empty on form submit,
* since we are not using native form validation, we need to offer the ability set the invalid state on the input
*/
@api
get invalid() {
return this._invalid;
}
set invalid(value) {
this._invalid = normalizeBoolean(value);
reflectAttribute(this, 'invalid', this._invalid);
}
/**
* Private getter to set the aria-invalid attribute on the input element
*/
get ariaInvalid() {
return this._ariaInvalid;
}
/**
* Returns the validity object of the input element
*/
@api
get validity() {
return Promise.resolve().then(() => this.input.validity);
}
/**
* Returns the validity message of the input element
*/
@api
get validityMessage() {
return this._validityMessage;
}
/**
* Returns the closest form element
* @returns {HTMLElement} - the form element
* @private
*/
get formElement() {
Ithis._formElement = this._formElement || this.template.host.closest('form');
return this._formElement;
}
/**
* If invalid, sets the aria-invalid attribute on the input element
* and sets invalid attribute on custom element
*
* @private
*/
isInvalid() {
if (!this.input.validity.valid) {
this.invalid = true;
this._ariaInvalid = 'true';
} else {
this.invalid = false;
this._ariaInvalid = 'false';
}
}
/**
* Returns the form's input element
*
* @returns {object} input element
* @private
*/
get input() {
this._inputElement = this._inputElement || this.template.querySelector('input');
return this._inputElement;
}
/**
* Returns the help text element, if it exists
* Used to dynamically add/remove the associated ID to the input element if help text is present
*
* @returns {object} help text element
* @private
*/
get helpText() {
this._helpTextElement = this._helpTextElement || this.template.querySelector('[part="help-text"]');
return this._helpTextElement;
}
/**
*I Validates the max and min values and if the value is between them.
*
* @param {number} max
* @param {number} min
* @param {number} value
* @returns {boolean}
*/
_validateRange(max, min, value) {
const isSameValue = max === min;
if (isSameValue) {
console.warn(`Max and Min cannot be the same value: max is ${max} and min is ${min}`);
return false;
}
const isOutOfRange = Number(value) < Number(min) || Number(value) > Number(max);
if (isOutOfRange) {
console.warn(`Value must be between ${min} and ${max}`);
return false;
}
return true;
}
/**
* Interpolates the value between the max and min values.
*
* @param {number} max
* @param {number} min
* @param {number} value
* @returns {number}
*/
_interpolateRange(max, min, value) {
Econst range = max - min;
const adjustedValue = value - min;
return (adjustedValue / range) * 100;
}
/**
* Slot change event on help text slot
* Used to dynamically add/remove the associated ID to the input element if help text is present
* Used to dynamically add "visible" part to the help text element if help text is found in the slot
*
* @param {*} e - slot change event
*/
handleHelpTextSlotChange(e) {
let childElements = e.target.assignedElements({ flatten: true });
if (childElements.length > 0) {
if (this.helpText) {
this.helpText.id = 'id-help-text';
this.input.setAttribute('aria-describedby', 'id-help-text');
this.helpText.setAttribute('part', 'help-text visible');
}
}
}
/**
* Slot change event on the label slot
* Used to check if the label has a slotted value, if not, we throw an error that one must be included
* @param {*} e - slot change event
*/
handleLabelSlotChange(e) {
!hasSlotText(e) && console.error('A label value must be included for all form elements.');
}
/**
* On blur event handler
* Used to remove the "active" attribute from the custom element since the user is no longer interacting with it
* Checks validity of the input element and sets the validity state
*
* @param {*} e - blur event
* @returns {Object} - validity state
*/
handleBlur(e) {
this._value = e.target.value;
this.removeAttribute('active');
this.removeAttribute('focus');
this.handleValidity();
this.isInvalid();
}
/**
* Set the validity message based on the validity state of the input element
*
* @private
*/
handleValidity() {
if (this.input.validity.valueMissing) {
this._validityMessage = `This field is required.`;
} else if (this.input.validity.rangeOverflow) {
this._validityMessage = `Value exceeds maximum of ${this.max}.`;
} else if (this.input.validity.rangeUnderflow) {
this._validityMessage = `Value is less than minimum of ${this.min}.`;
} else {
this._validityMessage = null;
}
}
/**
* On click event handler
* Used to focus the input element when the custom element is clicked
*
* @param {Object} e - click event
*/
handleClick(e) {
if (!this._disabled) {
this.focus();
}
}
/**
* On input event handler
* Used to set the "active" attribute on the custom element when the user is interacting with it
* Checks validity of the input element and sets the validity state via aria-invalid
*
* @param {Object} e - input event
*/
handleInput(e) {
if (!this._disabled) {
I this.setAttribute('active', '');
this._value = e.target.value;
}
}
@api
focus() {
this.input.focus();
this.setAttribute('focus', '');
}
renderedCallback() {
const { _max: max, _min: min, _value: value } = this;
let indicatorValue;
if (!this._validateRange(max, min, value)) {
return;
}
if (max !== '100' || min !== '0') {
indicatorValue = this._interpolateRange(max, min, value);
} else {
indicatorValue = value;
}
this.input.setAttribute(
'style',
`background: linear-gradient(to right,currentcolor, ${indicatorValue}%,var(--sds-c-inputrange-track-color) ${indicatorValue}%)`,
);
if (this.formElement) {
this.formElement.addEventListener('submit', () => {
this.handleValidity();
this.isInvalid();
});
}
}
}
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