Add Tom-Select lib

node_modules/tom-select/dist/js/plugins/virtual_scroll.js

@@ -0,0 +1,280 @@
+/**
+* Tom Select v2.4.3
+* Licensed under the Apache License, Version 2.0 (the "License");
+*/
+
+(function (global, factory) {
+	typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
+	typeof define === 'function' && define.amd ? define(factory) :
+	(global = typeof globalThis !== 'undefined' ? globalThis : global || self, global.virtual_scroll = factory());
+})(this, (function () { 'use strict';
+
+	/**
+	 * Converts a scalar to its best string representation
+	 * for hash keys and HTML attribute values.
+	 *
+	 * Transformations:
+	 *   'str'     -> 'str'
+	 *   null      -> ''
+	 *   undefined -> ''
+	 *   true      -> '1'
+	 *   false     -> '0'
+	 *   0         -> '0'
+	 *   1         -> '1'
+	 *
+	 */
+
+	/**
+	 * Iterates over arrays and hashes.
+	 *
+	 * ```
+	 * iterate(this.items, function(item, id) {
+	 *    // invoked for each item
+	 * });
+	 * ```
+	 *
+	 */
+	const iterate = (object, callback) => {
+	  if (Array.isArray(object)) {
+	    object.forEach(callback);
+	  } else {
+	    for (var key in object) {
+	      if (object.hasOwnProperty(key)) {
+	        callback(object[key], key);
+	      }
+	    }
+	  }
+	};
+
+	/**
+	 * Add css classes
+	 *
+	 */
+	const addClasses = (elmts, ...classes) => {
+	  var norm_classes = classesArray(classes);
+	  elmts = castAsArray(elmts);
+	  elmts.map(el => {
+	    norm_classes.map(cls => {
+	      el.classList.add(cls);
+	    });
+	  });
+	};
+
+	/**
+	 * Return arguments
+	 *
+	 */
+	const classesArray = args => {
+	  var classes = [];
+	  iterate(args, _classes => {
+	    if (typeof _classes === 'string') {
+	      _classes = _classes.trim().split(/[\t\n\f\r\s]/);
+	    }
+	    if (Array.isArray(_classes)) {
+	      classes = classes.concat(_classes);
+	    }
+	  });
+	  return classes.filter(Boolean);
+	};
+
+	/**
+	 * Create an array from arg if it's not already an array
+	 *
+	 */
+	const castAsArray = arg => {
+	  if (!Array.isArray(arg)) {
+	    arg = [arg];
+	  }
+	  return arg;
+	};
+
+	/**
+	 * Plugin: "restore_on_backspace" (Tom Select)
+	 * Copyright (c) contributors
+	 *
+	 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this
+	 * file except in compliance with the License. You may obtain a copy of the License at:
+	 * http://www.apache.org/licenses/LICENSE-2.0
+	 *
+	 * Unless required by applicable law or agreed to in writing, software distributed under
+	 * the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF
+	 * ANY KIND, either express or implied. See the License for the specific language
+	 * governing permissions and limitations under the License.
+	 *
+	 */
+
+	function plugin () {
+	  const self = this;
+	  const orig_canLoad = self.canLoad;
+	  const orig_clearActiveOption = self.clearActiveOption;
+	  const orig_loadCallback = self.loadCallback;
+	  var pagination = {};
+	  var dropdown_content;
+	  var loading_more = false;
+	  var load_more_opt;
+	  var default_values = [];
+	  if (!self.settings.shouldLoadMore) {
+	    // return true if additional results should be loaded
+	    self.settings.shouldLoadMore = () => {
+	      const scroll_percent = dropdown_content.clientHeight / (dropdown_content.scrollHeight - dropdown_content.scrollTop);
+	      if (scroll_percent > 0.9) {
+	        return true;
+	      }
+	      if (self.activeOption) {
+	        var selectable = self.selectable();
+	        var index = Array.from(selectable).indexOf(self.activeOption);
+	        if (index >= selectable.length - 2) {
+	          return true;
+	        }
+	      }
+	      return false;
+	    };
+	  }
+	  if (!self.settings.firstUrl) {
+	    throw 'virtual_scroll plugin requires a firstUrl() method';
+	  }
+
+	  // in order for virtual scrolling to work,
+	  // options need to be ordered the same way they're returned from the remote data source
+	  self.settings.sortField = [{
+	    field: '$order'
+	  }, {
+	    field: '$score'
+	  }];
+
+	  // can we load more results for given query?
+	  const canLoadMore = query => {
+	    if (typeof self.settings.maxOptions === 'number' && dropdown_content.children.length >= self.settings.maxOptions) {
+	      return false;
+	    }
+	    if (query in pagination && pagination[query]) {
+	      return true;
+	    }
+	    return false;
+	  };
+	  const clearFilter = (option, value) => {
+	    if (self.items.indexOf(value) >= 0 || default_values.indexOf(value) >= 0) {
+	      return true;
+	    }
+	    return false;
+	  };
+
+	  // set the next url that will be
+	  self.setNextUrl = (value, next_url) => {
+	    pagination[value] = next_url;
+	  };
+
+	  // getUrl() to be used in settings.load()
+	  self.getUrl = query => {
+	    if (query in pagination) {
+	      const next_url = pagination[query];
+	      pagination[query] = false;
+	      return next_url;
+	    }
+
+	    // if the user goes back to a previous query
+	    // we need to load the first page again
+	    self.clearPagination();
+	    return self.settings.firstUrl.call(self, query);
+	  };
+
+	  // clear pagination
+	  self.clearPagination = () => {
+	    pagination = {};
+	  };
+
+	  // don't clear the active option (and cause unwanted dropdown scroll)
+	  // while loading more results
+	  self.hook('instead', 'clearActiveOption', () => {
+	    if (loading_more) {
+	      return;
+	    }
+	    return orig_clearActiveOption.call(self);
+	  });
+
+	  // override the canLoad method
+	  self.hook('instead', 'canLoad', query => {
+	    // first time the query has been seen
+	    if (!(query in pagination)) {
+	      return orig_canLoad.call(self, query);
+	    }
+	    return canLoadMore(query);
+	  });
+
+	  // wrap the load
+	  self.hook('instead', 'loadCallback', (options, optgroups) => {
+	    if (!loading_more) {
+	      self.clearOptions(clearFilter);
+	    } else if (load_more_opt) {
+	      const first_option = options[0];
+	      if (first_option !== undefined) {
+	        load_more_opt.dataset.value = first_option[self.settings.valueField];
+	      }
+	    }
+	    orig_loadCallback.call(self, options, optgroups);
+	    loading_more = false;
+	  });
+
+	  // add templates to dropdown
+	  //	loading_more if we have another url in the queue
+	  //	no_more_results if we don't have another url in the queue
+	  self.hook('after', 'refreshOptions', () => {
+	    const query = self.lastValue;
+	    var option;
+	    if (canLoadMore(query)) {
+	      option = self.render('loading_more', {
+	        query: query
+	      });
+	      if (option) {
+	        option.setAttribute('data-selectable', ''); // so that navigating dropdown with [down] keypresses can navigate to this node
+	        load_more_opt = option;
+	      }
+	    } else if (query in pagination && !dropdown_content.querySelector('.no-results')) {
+	      option = self.render('no_more_results', {
+	        query: query
+	      });
+	    }
+	    if (option) {
+	      addClasses(option, self.settings.optionClass);
+	      dropdown_content.append(option);
+	    }
+	  });
+
+	  // add scroll listener and default templates
+	  self.on('initialize', () => {
+	    default_values = Object.keys(self.options);
+	    dropdown_content = self.dropdown_content;
+
+	    // default templates
+	    self.settings.render = Object.assign({}, {
+	      loading_more: () => {
+	        return `<div class="loading-more-results">Loading more results ... </div>`;
+	      },
+	      no_more_results: () => {
+	        return `<div class="no-more-results">No more results</div>`;
+	      }
+	    }, self.settings.render);
+
+	    // watch dropdown content scroll position
+	    dropdown_content.addEventListener('scroll', () => {
+	      if (!self.settings.shouldLoadMore.call(self)) {
+	        return;
+	      }
+
+	      // !important: this will get checked again in load() but we still need to check here otherwise loading_more will be set to true
+	      if (!canLoadMore(self.lastValue)) {
+	        return;
+	      }
+
+	      // don't call load() too much
+	      if (loading_more) return;
+	      loading_more = true;
+	      self.load.call(self, self.lastValue);
+	    });
+	  });
+	}
+
+	return plugin;
+
+}));
+//# sourceMappingURL=virtual_scroll.js.map