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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
/**
* A range slider component that can be used to select a value.
*
* @tagname moz-slider
* @property {number} min - The minimum value of the slider.
* @property {number} max - The maximum value of the slider.
* @property {number} value - The initial value of the slider.
* @property {number} ticks - The number of tick marks to display under the slider.
* @property {Array<string>} tickLabels - A list containing the tick label strings.
* @property {string} label - The label text for the slider.
* @property {string} sliderIcon - The url of the slider icon.
*/
export default class MozSlider extends MozLitElement {
static properties = {
min: { type: Number },
max: { type: Number },
value: { type: Number },
ticks: { type: Number },
tickLabels: { type: Array, attribute: "tick-labels" },
label: { type: String },
sliderIcon: { type: String, attribute: "slider-icon" },
};
static get queries() {
return {
tickMarks: "datalist",
sliderTrack: "#inputSlider",
};
}
constructor() {
super();
this.ticks = 0;
this.tickLabels = [];
this.sliderIcon = "";
}
getStepSize() {
const stepSize = (this.max - this.min) / (this.ticks - 1);
return stepSize;
}
setupIcon() {
if (this.sliderIcon) {
return html`<div class="icon-container">
<img class="icon" role="presentation" src=${this.sliderIcon} />
</div> `;
}
return "";
}
ticksTemplate() {
if (this.ticks > 0) {
let tickList = [];
let value = this.min;
let stepSize = this.getStepSize();
for (let i = 0; i < this.ticks; i++) {
let optionId = "";
let label = "";
if (this.tickLabels.length) {
if (i == 0) {
optionId = "inline-start-label";
label = this.tickLabels[0];
} else if (i == this.ticks - 1) {
optionId = "inline-end-label";
label = this.tickLabels[1];
}
}
tickList.push(
html`<option
id=${optionId}
value=${parseFloat(value).toFixed(2)}
label=${label}
></option>`
);
value += stepSize;
}
return html` <datalist id="slider-ticks">${tickList}</datalist> `;
}
return "";
}
handleChange(event) {
this.value = event.target.value;
this.dispatchEvent(
new CustomEvent("slider-changed", {
detail: this.value,
})
);
}
render() {
return html`
<link
rel="stylesheet"
/>
<div class="container">
${this.setupIcon()}
<div class="slider-container">
<label class="slider-label" for="inputSlider">${this.label}</label>
<input
id="inputSlider"
max=${this.max}
min=${this.min}
step=${this.getStepSize()}
type="range"
.value=${this.value}
list="slider-ticks"
@change=${this.handleChange}
/>
${this.ticksTemplate()}
</div>
</div>
`;
}
}
customElements.define("moz-slider", MozSlider);