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"use strict";
// Filters that are currently selected
var activeFilters = {
topics: [],
type: [],
"payment-tiers": [],
complexity: []
};
/* Check if there are no filters */
function noFilters() {
return (
activeFilters.topics.length === 0 &&
activeFilters.type.length === 0 &&
activeFilters["payment-tiers"].length === 0 &&
activeFilters.complexity.length === 0
);
}
/* Update the URL with new parameters */
function updateURL() {
// If there's nothing in the filters, we don't want anything in the URL.
if (noFilters()) {
window.history.replaceState(null, document.title, './');
return;
}
// Iterate through and get rid of empty ones
let searchParams = new URLSearchParams(activeFilters);
$.each(activeFilters, function(filterType, filters) {
if (filters.length === 0) {
searchParams.delete(filterType);
}
});
// Now update the URL
window.history.replaceState(null, document.title, `?${searchParams.toString()}`);
}
/* Get the params out of the URL and use them. This is run when the page loads. */
function deserializeURLParams() {
let searchParams = new window.URLSearchParams(window.location.search);
// Work through the parameters and add them to the filter object
$.each(Object.keys(activeFilters), function(_, filterType) {
let paramFilterContent = searchParams.get(filterType);
if (paramFilterContent !== null) {
// We use split here because we always want an array, not a string.
let paramFilterArray = paramFilterContent.split(",");
activeFilters[filterType] = paramFilterArray;
// Check corresponding checkboxes, so the UI reflects the internal state.
$(paramFilterArray).each(function(_, filter) {
let checkbox = $(`.filter-checkbox[data-filter-name=${filterType}][data-filter-item=${filter}]`);
checkbox.prop("checked", true);
});
}
});
}
/* Update the resources to match 'active_filters' */
function update() {
let resources = $('.resource-box');
// Update the URL to match the new filters.
updateURL();
// If there's nothing in the filters, show everything and return.
if (noFilters()) {
resources.show();
return;
}
// Otherwise, hide everything and then filter the resources to decide what to show.
resources.hide();
resources.filter(function() {
let validation = {
topics: false,
type: false,
'payment-tiers': false,
complexity: false
};
let resourceBox = $(this);
// Validate the filters
$.each(activeFilters, function(filterType, filters) {
// If the filter list is empty, this passes validation.
if (filters.length === 0) {
validation[filterType] = true;
return;
}
// Otherwise, we need to check if one of the classes exist.
$.each(filters, function(index, filter) {
if (resourceBox.hasClass(`${filterType}-${filter}`)) {
validation[filterType] = true;
}
});
});
// If validation passes, show the resource.
if (Object.values(validation).every(Boolean)) {
return true;
} else {
return false;
}
}).show();
}
// Executed when the page has finished loading.
document.addEventListener("DOMContentLoaded", function () {
// Update the filters on page load to reflect URL parameters.
deserializeURLParams();
update();
// If you collapse or uncollapse a filter group, swap the icon.
$('button.collapsible').click(function() {
let icon = $(this).find(".card-header-icon i");
if ($(icon).hasClass("fa-window-minimize")) {
$(icon).removeClass(["far", "fa-window-minimize"]);
$(icon).addClass(["fas", "fa-angle-down"]);
} else {
$(icon).removeClass(["fas", "fa-angle-down"]);
$(icon).addClass(["far", "fa-window-minimize"]);
}
});
// If you click on the div surrounding the filter checkbox, it clicks the checkbox.
$('.filter-panel').click(function() {
let checkbox = $(this).find(".filter-checkbox");
checkbox.prop("checked", !checkbox.prop("checked"));
checkbox.change();
});
// When checkboxes are toggled, trigger a filter update.
$('.filter-checkbox').change(function () {
let filterItem = this.dataset.filterItem;
let filterName = this.dataset.filterName;
var filterIndex = activeFilters[filterName].indexOf(filterItem);
if (this.checked) {
if (filterIndex === -1) {
activeFilters[filterName].push(filterItem);
}
update();
} else {
if (filterIndex !== -1) {
activeFilters[filterName].splice(filterIndex, 1);
}
update();
}
});
});
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