debian-mirror-gitlab/app/assets/javascripts/issuable/auto_width_dropdown_select.js

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JavaScript
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import $ from 'jquery';
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let instanceCount = 0;
class AutoWidthDropdownSelect {
constructor(selectElement) {
this.$selectElement = $(selectElement);
this.dropdownClass = `js-auto-width-select-dropdown-${instanceCount}`;
instanceCount += 1;
}
init() {
const dropdownClass = this.dropdownClass;
this.$selectElement.select2({
dropdownCssClass: dropdownClass,
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...AutoWidthDropdownSelect.selectOptions(this.dropdownClass),
});
return this;
}
static selectOptions(dropdownClass) {
return {
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dropdownCss() {
let resultantWidth = 'auto';
const $dropdown = $(`.${dropdownClass}`);
// We have to look at the parent because
// `offsetParent` on a `display: none;` is `null`
const offsetParentWidth = $(this).parent().offsetParent().width();
// Reset any width to let it naturally flow
$dropdown.css('width', 'auto');
if ($dropdown.outerWidth(false) > offsetParentWidth) {
resultantWidth = offsetParentWidth;
}
return {
width: resultantWidth,
maxWidth: offsetParentWidth,
};
},
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};
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}
}
export default AutoWidthDropdownSelect;