{"version":3,"file":"plugin.js","sources":["../../../../node_modules/@orchidjs/unicode-variants/dist/esm/index.js","../../../../node_modules/@orchidjs/sifter/lib/utils.ts","../../../../src/vanilla.ts","../../../../src/plugins/virtual_scroll/plugin.ts"],"sourcesContent":["/*! @orchidjs/unicode-variants | https://github.com/orchidjs/unicode-variants | Apache License (v2) */\nimport { toArray, setToPattern, escape_regex, arrayToPattern, sequencePattern } from './regex.js';\nexport { escape_regex } from './regex.js';\nimport { allSubstrings } from './strings.js';\n\n/**\n * @typedef {{[key:string]:string}} TUnicodeMap\n * @typedef {{[key:string]:Set<string>}} TUnicodeSets\n * @typedef {[[number,number]]} TCodePoints\n * @typedef {{folded:string,composed:string,code_point:number}} TCodePointObj\n * @typedef {{start:number,end:number,length:number,substr:string}} TSequencePart\n */\n/** @type {TCodePoints} */\n\nconst code_points = [[0, 65535]];\nconst accent_pat = '[\\u0300-\\u036F\\u{b7}\\u{2be}]'; // \\u{2bc}\n\n/** @type {TUnicodeMap} */\n\nlet unicode_map;\n/** @type {RegExp} */\n\nlet multi_char_reg;\nconst max_char_length = 3;\n/** @type {TUnicodeMap} */\n\nconst latin_convert = {\n  'æ': 'ae',\n  'ⱥ': 'a',\n  'ø': 'o',\n  '⁄': '/',\n  '∕': '/'\n};\nconst convert_pat = new RegExp(Object.keys(latin_convert).join('|') + '|' + accent_pat, 'gu');\n/**\n * Initialize the unicode_map from the give code point ranges\n *\n * @param {TCodePoints=} _code_points\n */\n\nconst initialize = _code_points => {\n  if (unicode_map !== undefined) return;\n  unicode_map = generateMap(_code_points || code_points);\n};\n/**\n * Helper method for normalize a string\n * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/normalize\n * @param {string} str\n * @param {string} form\n */\n\nconst normalize = (str, form = 'NFKD') => str.normalize(form);\n/**\n * Compatibility Decomposition without reordering string\n * calling str.normalize('NFKD') on \\u{594}\\u{595}\\u{596} becomes \\u{596}\\u{594}\\u{595}\n * @param {string} str\n */\n\nconst decompose = str => {\n  if (str.match(/[\\u0f71-\\u0f81]/)) {\n    return toArray(str).reduce(\n    /**\n     * @param {string} result\n     * @param {string} char\n     */\n    (result, char) => {\n      return result + normalize(char);\n    }, '');\n  }\n\n  return normalize(str);\n};\n/**\n * Remove accents\n * via https://github.com/krisk/Fuse/issues/133#issuecomment-318692703\n * @param {string} str\n * @return {string}\n */\n\nconst asciifold = str => {\n  return decompose(str).toLowerCase().replace(convert_pat, (\n  /** @type {string} */\n  char) => {\n    return latin_convert[char] || '';\n  });\n};\n/**\n * Generate a list of unicode variants from the list of code points\n * @param {TCodePoints} code_points\n * @yield {TCodePointObj}\n */\n\nfunction* generator(code_points) {\n  for (const [code_point_min, code_point_max] of code_points) {\n    for (let i = code_point_min; i <= code_point_max; i++) {\n      let composed = String.fromCharCode(i);\n      let folded = asciifold(composed);\n\n      if (folded == composed.toLowerCase()) {\n        continue;\n      } // skip when folded is a string longer than 3 characters long\n      // bc the resulting regex patterns will be long\n      // eg:\n      // folded صلى الله عليه وسلم length 18 code point 65018\n      // folded جل جلاله length 8 code point 65019\n\n\n      if (folded.length > max_char_length) {\n        continue;\n      }\n\n      if (folded.length == 0) {\n        continue;\n      }\n\n      let decomposed = normalize(composed);\n      let recomposed = normalize(decomposed, 'NFC');\n\n      if (recomposed === composed && folded === decomposed) {\n        continue;\n      }\n\n      yield {\n        folded: folded,\n        composed: composed,\n        code_point: i\n      };\n    }\n  }\n}\n/**\n * Generate a unicode map from the list of code points\n * @param {TCodePoints} code_points\n * @return {TUnicodeSets}\n */\n\nconst generateSets = code_points => {\n  /** @type {{[key:string]:Set<string>}} */\n  const unicode_sets = {};\n  /**\n   * @param {string} folded\n   * @param {string} to_add\n   */\n\n  const addMatching = (folded, to_add) => {\n    /** @type {Set<string>} */\n    const folded_set = unicode_sets[folded] || new Set();\n    const patt = new RegExp('^' + setToPattern(folded_set) + '$', 'iu');\n\n    if (to_add.match(patt)) {\n      return;\n    }\n\n    folded_set.add(escape_regex(to_add));\n    unicode_sets[folded] = folded_set;\n  };\n\n  for (let value of generator(code_points)) {\n    addMatching(value.folded, value.folded);\n    addMatching(value.folded, value.composed);\n  }\n\n  return unicode_sets;\n};\n/**\n * Generate a unicode map from the list of code points\n * ae => (?:(?:ae|Æ|Ǽ|Ǣ)|(?:A|Ⓐ|Ａ...)(?:E|ɛ|Ⓔ...))\n *\n * @param {TCodePoints} code_points\n * @return {TUnicodeMap}\n */\n\nconst generateMap = code_points => {\n  /** @type {TUnicodeSets} */\n  const unicode_sets = generateSets(code_points);\n  /** @type {TUnicodeMap} */\n\n  const unicode_map = {};\n  /** @type {string[]} */\n\n  let multi_char = [];\n\n  for (let folded in unicode_sets) {\n    let set = unicode_sets[folded];\n\n    if (set) {\n      unicode_map[folded] = setToPattern(set);\n    }\n\n    if (folded.length > 1) {\n      multi_char.push(escape_regex(folded));\n    }\n  }\n\n  multi_char.sort((a, b) => b.length - a.length);\n  const multi_char_patt = arrayToPattern(multi_char);\n  multi_char_reg = new RegExp('^' + multi_char_patt, 'u');\n  return unicode_map;\n};\n/**\n * Map each element of an array from it's folded value to all possible unicode matches\n * @param {string[]} strings\n * @param {number} min_replacement\n * @return {string}\n */\n\nconst mapSequence = (strings, min_replacement = 1) => {\n  let chars_replaced = 0;\n  strings = strings.map(str => {\n    if (unicode_map[str]) {\n      chars_replaced += str.length;\n    }\n\n    return unicode_map[str] || str;\n  });\n\n  if (chars_replaced >= min_replacement) {\n    return sequencePattern(strings);\n  }\n\n  return '';\n};\n/**\n * Convert a short string and split it into all possible patterns\n * Keep a pattern only if min_replacement is met\n *\n * 'abc'\n * \t\t=> [['abc'],['ab','c'],['a','bc'],['a','b','c']]\n *\t\t=> ['abc-pattern','ab-c-pattern'...]\n *\n *\n * @param {string} str\n * @param {number} min_replacement\n * @return {string}\n */\n\nconst substringsToPattern = (str, min_replacement = 1) => {\n  min_replacement = Math.max(min_replacement, str.length - 1);\n  return arrayToPattern(allSubstrings(str).map(sub_pat => {\n    return mapSequence(sub_pat, min_replacement);\n  }));\n};\n/**\n * Convert an array of sequences into a pattern\n * [{start:0,end:3,length:3,substr:'iii'}...] => (?:iii...)\n *\n * @param {Sequence[]} sequences\n * @param {boolean} all\n */\n\nconst sequencesToPattern = (sequences, all = true) => {\n  let min_replacement = sequences.length > 1 ? 1 : 0;\n  return arrayToPattern(sequences.map(sequence => {\n    let seq = [];\n    const len = all ? sequence.length() : sequence.length() - 1;\n\n    for (let j = 0; j < len; j++) {\n      seq.push(substringsToPattern(sequence.substrs[j] || '', min_replacement));\n    }\n\n    return sequencePattern(seq);\n  }));\n};\n/**\n * Return true if the sequence is already in the sequences\n * @param {Sequence} needle_seq\n * @param {Sequence[]} sequences\n */\n\n\nconst inSequences = (needle_seq, sequences) => {\n  for (const seq of sequences) {\n    if (seq.start != needle_seq.start || seq.end != needle_seq.end) {\n      continue;\n    }\n\n    if (seq.substrs.join('') !== needle_seq.substrs.join('')) {\n      continue;\n    }\n\n    let needle_parts = needle_seq.parts;\n    /**\n     * @param {TSequencePart} part\n     */\n\n    const filter = part => {\n      for (const needle_part of needle_parts) {\n        if (needle_part.start === part.start && needle_part.substr === part.substr) {\n          return false;\n        }\n\n        if (part.length == 1 || needle_part.length == 1) {\n          continue;\n        } // check for overlapping parts\n        // a = ['::=','==']\n        // b = ['::','===']\n        // a = ['r','sm']\n        // b = ['rs','m']\n\n\n        if (part.start < needle_part.start && part.end > needle_part.start) {\n          return true;\n        }\n\n        if (needle_part.start < part.start && needle_part.end > part.start) {\n          return true;\n        }\n      }\n\n      return false;\n    };\n\n    let filtered = seq.parts.filter(filter);\n\n    if (filtered.length > 0) {\n      continue;\n    }\n\n    return true;\n  }\n\n  return false;\n};\n\nclass Sequence {\n  constructor() {\n    /** @type {TSequencePart[]} */\n    this.parts = [];\n    /** @type {string[]} */\n\n    this.substrs = [];\n    this.start = 0;\n    this.end = 0;\n  }\n  /**\n   * @param {TSequencePart|undefined} part\n   */\n\n\n  add(part) {\n    if (part) {\n      this.parts.push(part);\n      this.substrs.push(part.substr);\n      this.start = Math.min(part.start, this.start);\n      this.end = Math.max(part.end, this.end);\n    }\n  }\n\n  last() {\n    return this.parts[this.parts.length - 1];\n  }\n\n  length() {\n    return this.parts.length;\n  }\n  /**\n   * @param {number} position\n   * @param {TSequencePart} last_piece\n   */\n\n\n  clone(position, last_piece) {\n    let clone = new Sequence();\n    let parts = JSON.parse(JSON.stringify(this.parts));\n    let last_part = parts.pop();\n\n    for (const part of parts) {\n      clone.add(part);\n    }\n\n    let last_substr = last_piece.substr.substring(0, position - last_part.start);\n    let clone_last_len = last_substr.length;\n    clone.add({\n      start: last_part.start,\n      end: last_part.start + clone_last_len,\n      length: clone_last_len,\n      substr: last_substr\n    });\n    return clone;\n  }\n\n}\n/**\n * Expand a regular expression pattern to include unicode variants\n * \teg /a/ becomes /aⓐａẚàáâầấẫẩãāăằắẵẳȧǡäǟảåǻǎȁȃạậặḁąⱥɐɑAⒶＡÀÁÂẦẤẪẨÃĀĂẰẮẴẲȦǠÄǞẢÅǺǍȀȂẠẬẶḀĄȺⱯ/\n *\n * Issue:\n *  ﺊﺋ [ 'ﺊ = \\\\u{fe8a}', 'ﺋ = \\\\u{fe8b}' ]\n *\tbecomes:\tئئ [ 'ي = \\\\u{64a}', 'ٔ = \\\\u{654}', 'ي = \\\\u{64a}', 'ٔ = \\\\u{654}' ]\n *\n *\tİIJ = IIJ = ⅡJ\n *\n * \t1/2/4\n *\n * @param {string} str\n * @return {string|undefined}\n */\n\n\nconst getPattern = str => {\n  initialize();\n  str = asciifold(str);\n  let pattern = '';\n  let sequences = [new Sequence()];\n\n  for (let i = 0; i < str.length; i++) {\n    let substr = str.substring(i);\n    let match = substr.match(multi_char_reg);\n    const char = str.substring(i, i + 1);\n    const match_str = match ? match[0] : null; // loop through sequences\n    // add either the char or multi_match\n\n    let overlapping = [];\n    let added_types = new Set();\n\n    for (const sequence of sequences) {\n      const last_piece = sequence.last();\n\n      if (!last_piece || last_piece.length == 1 || last_piece.end <= i) {\n        // if we have a multi match\n        if (match_str) {\n          const len = match_str.length;\n          sequence.add({\n            start: i,\n            end: i + len,\n            length: len,\n            substr: match_str\n          });\n          added_types.add('1');\n        } else {\n          sequence.add({\n            start: i,\n            end: i + 1,\n            length: 1,\n            substr: char\n          });\n          added_types.add('2');\n        }\n      } else if (match_str) {\n        let clone = sequence.clone(i, last_piece);\n        const len = match_str.length;\n        clone.add({\n          start: i,\n          end: i + len,\n          length: len,\n          substr: match_str\n        });\n        overlapping.push(clone);\n      } else {\n        // don't add char\n        // adding would create invalid patterns: 234 => [2,34,4]\n        added_types.add('3');\n      }\n    } // if we have overlapping\n\n\n    if (overlapping.length > 0) {\n      // ['ii','iii'] before ['i','i','iii']\n      overlapping = overlapping.sort((a, b) => {\n        return a.length() - b.length();\n      });\n\n      for (let clone of overlapping) {\n        // don't add if we already have an equivalent sequence\n        if (inSequences(clone, sequences)) {\n          continue;\n        }\n\n        sequences.push(clone);\n      }\n\n      continue;\n    } // if we haven't done anything unique\n    // clean up the patterns\n    // helps keep patterns smaller\n    // if str = 'r₨㎧aarss', pattern will be 446 instead of 655\n\n\n    if (i > 0 && added_types.size == 1 && !added_types.has('3')) {\n      pattern += sequencesToPattern(sequences, false);\n      let new_seq = new Sequence();\n      const old_seq = sequences[0];\n\n      if (old_seq) {\n        new_seq.add(old_seq.last());\n      }\n\n      sequences = [new_seq];\n    }\n  }\n\n  pattern += sequencesToPattern(sequences, true);\n  return pattern;\n};\n\nexport { asciifold, code_points, decompose, generateMap, generateSets, generator, getPattern, initialize, mapSequence, normalize, substringsToPattern, unicode_map };\n//# sourceMappingURL=index.js.map\n","\nimport { asciifold } from '@orchidjs/unicode-variants';\nimport * as T from './types';\n\n\n/**\n * A property getter resolving dot-notation\n * @param  {Object}  obj     The root object to fetch property on\n * @param  {String}  name    The optionally dotted property name to fetch\n * @return {Object}          The resolved property value\n */\nexport const getAttr = (obj:{[key:string]:any}, name:string ) => {\n    if (!obj ) return;\n    return obj[name];\n};\n\n/**\n * A property getter resolving dot-notation\n * @param  {Object}  obj     The root object to fetch property on\n * @param  {String}  name    The optionally dotted property name to fetch\n * @return {Object}          The resolved property value\n */\nexport const getAttrNesting = (obj:{[key:string]:any}, name:string ) => {\n    if (!obj ) return;\n    var part, names = name.split(\".\");\n\twhile( (part = names.shift()) && (obj = obj[part]));\n    return obj;\n};\n\n/**\n * Calculates how close of a match the\n * given value is against a search token.\n *\n */\nexport const scoreValue = (value:string, token:T.Token, weight:number ):number => {\n\tvar score, pos;\n\n\tif (!value) return 0;\n\n\tvalue = value + '';\n\tif( token.regex == null ) return 0;\n\tpos = value.search(token.regex);\n\tif (pos === -1) return 0;\n\n\tscore = token.string.length / value.length;\n\tif (pos === 0) score += 0.5;\n\n\treturn score * weight;\n};\n\n\n/**\n * Cast object property to an array if it exists and has a value\n *\n */\nexport const propToArray = (obj:{[key:string]:any}, key:string) => {\n\tvar value = obj[key];\n\n\tif( typeof value == 'function' ) return value;\n\n\tif( value && !Array.isArray(value) ){\n\t\tobj[key] = [value];\n\t}\n}\n\n\n/**\n * Iterates over arrays and hashes.\n *\n * ```\n * iterate(this.items, function(item, id) {\n *    // invoked for each item\n * });\n * ```\n *\n */\nexport const iterate = (object:[]|{[key:string]:any}, callback:(value:any,key:any)=>any) => {\n\n\tif ( Array.isArray(object)) {\n\t\tobject.forEach(callback);\n\n\t}else{\n\n\t\tfor (var key in object) {\n\t\t\tif (object.hasOwnProperty(key)) {\n\t\t\t\tcallback(object[key], key);\n\t\t\t}\n\t\t}\n\t}\n};\n\n\n\nexport const cmp = (a:number|string, b:number|string) => {\n\tif (typeof a === 'number' && typeof b === 'number') {\n\t\treturn a > b ? 1 : (a < b ? -1 : 0);\n\t}\n\ta = asciifold(a + '').toLowerCase();\n\tb = asciifold(b + '').toLowerCase();\n\tif (a > b) return 1;\n\tif (b > a) return -1;\n\treturn 0;\n};\n","\nimport { iterate } from '@orchidjs/sifter/lib/utils';\n\n/**\n * Return a dom element from either a dom query string, jQuery object, a dom element or html string\n * https://stackoverflow.com/questions/494143/creating-a-new-dom-element-from-an-html-string-using-built-in-dom-methods-or-pro/35385518#35385518\n *\n * param query should be {}\n */\nexport const getDom = ( query:any ):HTMLElement => {\n\n\tif( query.jquery ){\n\t\treturn query[0];\n\t}\n\n\tif( query instanceof HTMLElement ){\n\t\treturn query;\n\t}\n\n\tif( isHtmlString(query) ){\n\t\tvar tpl = document.createElement('template');\n\t\ttpl.innerHTML = query.trim(); // Never return a text node of whitespace as the result\n\t\treturn tpl.content.firstChild as HTMLElement;\n\t}\n\n\treturn document.querySelector(query);\n};\n\nexport const isHtmlString = (arg:any): boolean => {\n\tif( typeof arg === 'string' && arg.indexOf('<') > -1 ){\n\t\treturn true;\n\t}\n\treturn false;\n}\n\nexport const escapeQuery = (query:string):string => {\n\treturn query.replace(/['\"\\\\]/g, '\\\\$&');\n}\n\n/**\n * Dispatch an event\n *\n */\nexport const triggerEvent = ( dom_el:HTMLElement, event_name:string ):void => {\n\tvar event = document.createEvent('HTMLEvents');\n\tevent.initEvent(event_name, true, false);\n\tdom_el.dispatchEvent(event)\n};\n\n/**\n * Apply CSS rules to a dom element\n *\n */\nexport const applyCSS = ( dom_el:HTMLElement, css:{ [key: string]: string|number }):void => {\n\tObject.assign(dom_el.style, css);\n}\n\n\n/**\n * Add css classes\n *\n */\nexport const addClasses = ( elmts:HTMLElement|HTMLElement[], ...classes:string[]|string[][] ) => {\n\n\tvar norm_classes \t= classesArray(classes);\n\telmts\t\t\t\t= castAsArray(elmts);\n\n\telmts.map( el => {\n\t\tnorm_classes.map( cls => {\n\t\t\tel.classList.add( cls );\n\t\t});\n\t});\n}\n\n/**\n * Remove css classes\n *\n */\n export const removeClasses = ( elmts:HTMLElement|HTMLElement[], ...classes:string[]|string[][] ) => {\n\n \tvar norm_classes \t= classesArray(classes);\n\telmts\t\t\t\t= castAsArray(elmts);\n\n\telmts.map( el => {\n\t\tnorm_classes.map(cls => {\n\t \t\tel.classList.remove( cls );\n\t\t});\n \t});\n }\n\n\n/**\n * Return arguments\n *\n */\nexport const classesArray = (args:string[]|string[][]):string[] => {\n\tvar classes:string[] = [];\n\titerate( args, (_classes) =>{\n\t\tif( typeof _classes === 'string' ){\n\t\t\t_classes = _classes.trim().split(/[\\11\\12\\14\\15\\40]/);\n\t\t}\n\t\tif( Array.isArray(_classes) ){\n\t\t\tclasses = classes.concat(_classes);\n\t\t}\n\t});\n\n\treturn classes.filter(Boolean);\n}\n\n\n/**\n * Create an array from arg if it's not already an array\n *\n */\nexport const castAsArray = (arg:any):Array<any> => {\n\tif( !Array.isArray(arg) ){\n \t\targ = [arg];\n \t}\n\treturn arg;\n}\n\n\n/**\n * Get the closest node to the evt.target matching the selector\n * Stops at wrapper\n *\n */\nexport const parentMatch = ( target:null|HTMLElement, selector:string, wrapper?:HTMLElement ):HTMLElement|void => {\n\n\tif( wrapper && !wrapper.contains(target) ){\n\t\treturn;\n\t}\n\n\twhile( target && target.matches ){\n\n\t\tif( target.matches(selector) ){\n\t\t\treturn target;\n\t\t}\n\n\t\ttarget = target.parentNode as HTMLElement;\n\t}\n}\n\n\n/**\n * Get the first or last item from an array\n *\n * > 0 - right (last)\n * <= 0 - left (first)\n *\n */\nexport const getTail = ( list:Array<any>|NodeList, direction:number=0 ):any => {\n\n\tif( direction > 0 ){\n\t\treturn list[list.length-1];\n\t}\n\n\treturn list[0];\n}\n\n/**\n * Return true if an object is empty\n *\n */\nexport const isEmptyObject = (obj:object):boolean => {\n\treturn (Object.keys(obj).length === 0);\n}\n\n\n/**\n * Get the index of an element amongst sibling nodes of the same type\n *\n */\nexport const nodeIndex = ( el:null|Element, amongst?:string ):number => {\n\tif (!el) return -1;\n\n\tamongst = amongst || el.nodeName;\n\n\tvar i = 0;\n\twhile( el = el.previousElementSibling ){\n\n\t\tif( el.matches(amongst) ){\n\t\t\ti++;\n\t\t}\n\t}\n\treturn i;\n}\n\n\n/**\n * Set attributes of an element\n *\n */\nexport const setAttr = (el:Element,attrs:{ [key: string]: null|string|number }) => {\n\titerate( attrs,(val,attr) => {\n\t\tif( val == null ){\n\t\t\tel.removeAttribute(attr as string);\n\t\t}else{\n\t\t\tel.setAttribute(attr as string, ''+val);\n\t\t}\n\t});\n}\n\n\n/**\n * Replace a node\n */\nexport const replaceNode = ( existing:Node, replacement:Node ) => {\n\tif( existing.parentNode ) existing.parentNode.replaceChild(replacement, existing);\n}\n","/**\n * Plugin: \"restore_on_backspace\" (Tom Select)\n * Copyright (c) contributors\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\"); you may not use this\n * file except in compliance with the License. You may obtain a copy of the License at:\n * http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software distributed under\n * the License is distributed on an \"AS IS\" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF\n * ANY KIND, either express or implied. See the License for the specific language\n * governing permissions and limitations under the License.\n *\n */\n\nimport TomSelect from '../../tom-select';\nimport { TomOption } from '../../types/index';\nimport { addClasses } from '../../vanilla';\n\nexport default function(this:TomSelect) {\n\tconst self\t\t\t\t\t\t\t= this;\n\tconst orig_canLoad\t\t\t\t\t= self.canLoad;\n\tconst orig_clearActiveOption\t\t= self.clearActiveOption;\n\tconst orig_loadCallback\t\t\t\t= self.loadCallback;\n\n\tvar pagination:{[key:string]:any}\t= {};\n\tvar dropdown_content:HTMLElement;\n\tvar loading_more\t\t\t\t\t= false;\n\tvar load_more_opt:HTMLElement;\n\tvar default_values: string[]\t\t= [];\n\n\tif( !self.settings.shouldLoadMore ){\n\n\t\t// return true if additional results should be loaded\n\t\tself.settings.shouldLoadMore = ():boolean=>{\n\n\t\t\tconst scroll_percent = dropdown_content.clientHeight / (dropdown_content.scrollHeight - dropdown_content.scrollTop);\n\t\t\tif( scroll_percent > 0.9 ){\n\t\t\t\treturn true;\n\t\t\t}\n\n\t\t\tif( self.activeOption ){\n\t\t\t\tvar selectable\t= self.selectable();\n\t\t\t\tvar index\t\t= Array.from(selectable).indexOf(self.activeOption);\n\t\t\t\tif( index >= (selectable.length-2) ){\n\t\t\t\t\treturn true;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\treturn false;\n\t\t}\n\t}\n\n\n\tif( !self.settings.firstUrl ){\n\t\tthrow 'virtual_scroll plugin requires a firstUrl() method';\n\t}\n\n\n\t// in order for virtual scrolling to work,\n\t// options need to be ordered the same way they're returned from the remote data source\n\tself.settings.sortField\t\t\t= [{field:'$order'},{field:'$score'}];\n\n\n\t// can we load more results for given query?\n\tconst canLoadMore = (query:string):boolean => {\n\n\t\tif( typeof self.settings.maxOptions === 'number' && dropdown_content.children.length >= self.settings.maxOptions ){\n\t\t\treturn false;\n\t\t}\n\n\t\tif( (query in pagination) && pagination[query] ){\n\t\t\treturn true;\n\t\t}\n\n\t\treturn false;\n\t};\n\n\tconst clearFilter = (option:TomOption, value:string):boolean => {\n\t\tif( self.items.indexOf(value) >= 0 || default_values.indexOf(value) >= 0 ){\n\t\t\treturn true;\n\t\t}\n\t\treturn false;\n\t};\n\n\n\t// set the next url that will be\n\tself.setNextUrl = (value:string,next_url:any):void => {\n\t\tpagination[value] = next_url;\n\t};\n\n\t// getUrl() to be used in settings.load()\n\tself.getUrl = (query:string):any =>{\n\n\t\tif( query in pagination ){\n\t\t\tconst next_url = pagination[query];\n\t\t\tpagination[query] = false;\n\t\t\treturn next_url;\n\t\t}\n\n\t\t// if the user goes back to a previous query\n\t\t// we need to load the first page again\n\t\tpagination = {};\n\n\t\treturn self.settings.firstUrl.call(self,query);\n\t};\n\n\n\t// don't clear the active option (and cause unwanted dropdown scroll)\n\t// while loading more results\n\tself.hook('instead','clearActiveOption',()=>{\n\n\t\tif( loading_more ){\n\t\t\treturn;\n\t\t}\n\n\t\treturn 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