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'use strict';
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{
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const SelectBox = {
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cache: {},
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init: function(id) {
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const box = document.getElementById(id);
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SelectBox.cache[id] = [];
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const cache = SelectBox.cache[id];
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for (const node of box.options) {
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cache.push({value: node.value, text: node.text, displayed: 1});
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}
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},
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redisplay: function(id) {
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// Repopulate HTML select box from cache
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const box = document.getElementById(id);
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const scroll_value_from_top = box.scrollTop;
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box.innerHTML = '';
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for (const node of SelectBox.cache[id]) {
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if (node.displayed) {
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const new_option = new Option(node.text, node.value, false, false);
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// Shows a tooltip when hovering over the option
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new_option.title = node.text;
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box.appendChild(new_option);
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}
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}
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box.scrollTop = scroll_value_from_top;
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},
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filter: function(id, text) {
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// Redisplay the HTML select box, displaying only the choices containing ALL
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// the words in text. (It's an AND search.)
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const tokens = text.toLowerCase().split(/\s+/);
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for (const node of SelectBox.cache[id]) {
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node.displayed = 1;
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const node_text = node.text.toLowerCase();
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for (const token of tokens) {
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if (!node_text.includes(token)) {
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node.displayed = 0;
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break; // Once the first token isn't found we're done
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}
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}
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}
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SelectBox.redisplay(id);
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},
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delete_from_cache: function(id, value) {
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let delete_index = null;
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const cache = SelectBox.cache[id];
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for (const [i, node] of cache.entries()) {
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if (node.value === value) {
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delete_index = i;
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break;
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}
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}
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cache.splice(delete_index, 1);
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},
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add_to_cache: function(id, option) {
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SelectBox.cache[id].push({value: option.value, text: option.text, displayed: 1});
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},
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cache_contains: function(id, value) {
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// Check if an item is contained in the cache
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for (const node of SelectBox.cache[id]) {
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if (node.value === value) {
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return true;
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}
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}
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return false;
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},
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move: function(from, to) {
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const from_box = document.getElementById(from);
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for (const option of from_box.options) {
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const option_value = option.value;
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if (option.selected && SelectBox.cache_contains(from, option_value)) {
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SelectBox.add_to_cache(to, {value: option_value, text: option.text, displayed: 1});
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SelectBox.delete_from_cache(from, option_value);
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}
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}
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SelectBox.redisplay(from);
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SelectBox.redisplay(to);
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},
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move_all: function(from, to) {
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const from_box = document.getElementById(from);
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for (const option of from_box.options) {
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const option_value = option.value;
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if (SelectBox.cache_contains(from, option_value)) {
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SelectBox.add_to_cache(to, {value: option_value, text: option.text, displayed: 1});
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SelectBox.delete_from_cache(from, option_value);
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}
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}
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SelectBox.redisplay(from);
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SelectBox.redisplay(to);
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},
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sort: function(id) {
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SelectBox.cache[id].sort(function(a, b) {
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a = a.text.toLowerCase();
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b = b.text.toLowerCase();
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if (a > b) {
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return 1;
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}
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if (a < b) {
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return -1;
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}
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return 0;
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} );
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},
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select_all: function(id) {
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const box = document.getElementById(id);
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for (const option of box.options) {
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option.selected = true;
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}
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}
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};
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window.SelectBox = SelectBox;
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}
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