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gtrabanco/parser.ts

Last active May 23, 2023 00:54
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Idea to parse document
Raw
parser.ts
import { genericMapToType } from './generic-map-to-type.ts';
export type ScraperSetter = (property: string, value?: any) => void;
type Key = Exclude<any, Function>;
type Value = Exclude<any, Function>;
export type ScrapeHandler = {
selector: string;
handler: HTMLRewriterTypes.HTMLRewriterElementContentHandlers;
};
export type ScrapeHandleElement = (setter: Map<Key, Value>) => ScrapeHandler;
export type ScrapeHandleMultipleElements = (
setter: Map<Key, Map<Key, Value>>
) => Array<ScrapeHandler> | ScrapeHandler;
export class KVScrapeStorage extends Map<Key, Value> {
constructor() {
super();
}
set(key: Key, value: Value | ((prev?: Value) => Value)): this {
const current = this.get(key) ?? undefined;
const newValue = value instanceof Function ? value(current) : value;
return super.set(key, newValue);
}
get(key: string): Map<Key, Value> | undefined {
return super.get(key);
}
}
// Next class is for internal use in HTMLRewriterScrapeDocument
class DocumentKVStorage extends Map<Key, Value> {
constructor() {
super();
}
set(key: Key, value: Value | ((prev?: Value) => Value)): this {
const current = this.get(key) ?? undefined;
const newValue = value instanceof Function ? value(current) : value;
return super.set(key, newValue);
}
get(key: string): Map<Key, Value> | undefined {
return super.get(key);
}
}
type MaptToTypeHandler = (result: Map<Key, Value>) => any;
export class HTMLRewriterScrapeDocument extends HTMLRewriter {
private kv = new DocumentKVStorage();
private mapToType: {
[key: string]: typeof genericMapToType;
} = {};
constructor() {
super();
}
public addHandlers(
alias: string,
handlers:
| Array<ScrapeHandleElement>
| ScrapeHandleElement
| ScrapeHandleMultipleElements,
mapToType?: MaptToTypeHandler
) {
this.kv.set(alias, new KVScrapeStorage());
const setter = this.kv.get(alias)!;
if (mapToType) {
this.mapToType[alias] = mapToType;
}
if (Array.isArray(handlers)) {
handlers.forEach((handle: ScrapeHandleElement) => {
const { selector, handler: handleParseElement } = handle(setter);
super.on(selector, handleParseElement);
});
}
if (handlers instanceof Function) {
const handleParsing = handlers(setter);
if (Array.isArray(handleParsing)) {
handleParsing.forEach(({ selector, handler: handleParseElement }) =>
super.on(selector, handleParseElement)
);
} else {
super.on(handleParsing.selector, handleParsing.handler);
}
}
return this;
}
scrape(response: Response) {
super.transform(response);
const keys = this.kv.keys();
const result = {} as { [key: string]: any };
for (const key of keys) {
const value = this.kv.get(key);
if (value) {
result[key] = this.mapToType[key] ? this.mapToType[key](value) : value;
}
}
return result;
}
}
// HOW TO PARSE A PAGE
// Selectors
const currentSelectedFederationIdSelect = '#territorial > option[selected]';
const currentPageFederationHeaderAElementSelector =
'#cabecera > div:nth-child(2) > a:nth-child(1)';
const currentPageFederationImgElementSelector =
'#cabecera > div:nth-child(2) > a:nth-child(1) > img';
// Getting the info from those selectors in the page
export const currentFederationInfo = (kv: KVScrapeStorage) => [
{
// Federation id and name
selector: currentSelectedFederationIdSelect,
handler: {
element: (element: HTMLRewriterTypes.Element) => {
const key = 'rfebmId';
const value = Number(element.getAttribute('value')) ?? -1;
kv.set(key, value);
},
text: ({ text }: HTMLRewriterTypes.Text) => {
const key = 'name';
const value = text.trim();
kv.set(key, (prev?: string) => (prev ?? '') + value);
},
},
},
{
// Url to the federation website
selector: currentPageFederationHeaderAElementSelector,
handler: {
element: (element: HTMLRewriterTypes.Element) => {
const key = 'url';
const urlString = element.getAttribute('href');
kv.set(key, urlString);
},
},
},
{
// Url to the federation shield
selector: currentPageFederationImgElementSelector,
handler: {
element: (element: HTMLRewriterTypes.Element) => {
const key = 'shieldUrl';
const imgUrl = element.getAttribute('src');
kv.set(key, imgUrl);
},
},
},
];
// Parse <select> of all federations
const federationsSelector = '#territorial > option';
function allFederationsInfo(kv: KVScrapeStorage) {
let currentNumber = -1;
return [
{
selector: federationsSelector,
handler: {
element: (element: HTMLRewriterTypes.Element) => {
currentNumber = Number(element.getAttribute('value')) ?? -1;
},
text: ({ text }: HTMLRewriterTypes.Text) => {
const name = text.trim();
if (name.length > 0) {
kv.set(currentNumber, name);
}
},
},
},
];
}
// How to use all above:
// const rw = new HTMLRewriterScrapeDocument();
// rw.addHandlers('currentFederation', federationInfoFromHeaderHandle);
// rw.addHandlers('allFederations', allFederationsInfo);
// const response = await fetch(
// 'https://www.rfebm.com/competiciones/competicion.php'
// );
// const result = rw.scrape(response);
// console.log(result);
@gtrabanco
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gtrabanco commented May 20, 2023 •
edited
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Expected output

{
  "currentFederation": Map(4) {
    "url": "//www.rfebm.com",
    "shieldUrl": "/competiciones/images/logo.png",
    "rfebmId": 9999,
    "name": "REAL FEDERACION ESPAÑOLA",
  },
  "allFederations": Map(19) {
    33: "FED. DE LA C. VALENCIANA",
    36: "FED. TERRIT. DE CASTILLA Y LEON",
    35: "FED. TERRITORIAL CANTABRA",
    37: "FED. TERRITORIAL DE CANARIAS",
    31: "FED. TERRITORIAL NAVARRA",
    32: "FED. TERRITORIAL RIOJANA",
    17: "FEDERACION CATALANA",
    24: "FEDERACION DE CEUTA",
    22: "FEDERACION DE LA R. DE MURCIA",
    19: "FEDERACION EXTREMEÑA",
    20: "FEDERACION GALEGA de BALONMAN",
    25: "FEDERACION MELILLENSE",
    28: "FEDERACION TERR. PRINCIPADO DE ASTURIAS",
    26: "FEDERACION TERRITORIAL ANDALUZA",
    29: "FEDERACION TERRITORIAL BALEAR",
    27: "FEDERACION TERRITORIAL DE ARAGON",
    21: "FEDERACION TERRITORIAL MADRILEÑA",
    18: "FEDERACION VASCA",
    9999: "REAL FEDERACION ESPAÑOLA",
  }
}

@gtrabanco
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To parse a table I have done this function:

import { KVScrapeStorage } from 'libraries/html-rewriter-scrape-document.ts';

type HTMLTagAttributeResult = [string, string]; // [key, value]
type HTMLTagResult = {
  [key: string]: Array<HTMLTagAttributeResult>;
} & {
  text?: string;
};

export type HTMLTableRowResult = Map<number, Map<string, HTMLTagResult>>;

// selector must end with ' *' to parse inner elements as well
// if table has tbody, selector must be 'table > tbody > *'
// if table has no tbody, selector must be 'table > *'
// Whatever you do it needs to parse tr and td and subelements
export function tableParserAsJSON(tableRowSelector: string) {
  let currentRowNumber = 0;
  let currentCellNumber = -1;
  let currentTagName = '';

  return (kvScrapeStorage: KVScrapeStorage) => ({
    selector: tableRowSelector,
    handler: {
      element: (element: HTMLRewriterTypes.Element) => {
        currentTagName = element.tagName;
        if (element.tagName === 'tr') {
          currentRowNumber++;
          currentCellNumber = 0;
        }
        if (element.tagName === 'td') {
          currentCellNumber++;
        }
        kvScrapeStorage.set(currentRowNumber, (prev: any) => {
          prev ??= {};
          prev[currentCellNumber] ??= {};
          prev[currentCellNumber][currentTagName] ??= [];

          const attrs = Object.fromEntries(element.attributes);
          const attrsEntries = Object.entries(attrs);
          prev[currentCellNumber][currentTagName].push({ attrsEntries });

          return prev;
        });
      },
      text: ({ text }: HTMLRewriterTypes.Text) => {
        if (currentTagName === 'tr') return;
        kvScrapeStorage.set(currentRowNumber, (prev?: any) => {
          prev ??= {};
          prev[currentCellNumber] ??= {};
          prev[currentCellNumber][currentTagName] ??= [];
          const currentIndex =
            prev[currentCellNumber][currentTagName].length - 1;
          prev[currentCellNumber][currentTagName][currentIndex]['text'] ??= '';
          prev[currentCellNumber][currentTagName][currentIndex]['text'] += text;
          return prev;
        });
      },
    },
  });
}

export function genericTableMapToTypedTable(cellNames?: Array<string>) {
  return function (table: HTMLTableRowResult) {
    const rows = Array.from(table.values());
    const rowsCells = rows.map((row) => {
      const cells = Object.values(row);

      if (!cellNames) return cells;
      const cellsEntries = cells.map((cell, index) => [
        cellNames?.[index] ?? index,
        cell,
      ]);

      return Object.fromEntries(cellsEntries);
    });

    return rowsCells;
  };
}

@gtrabanco
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Parsing a table example with output:

import {
  genericTableMapToTypedTable,
  tableParserAsJSON,
} from './src/scrape-pages/handlers/generic/table-as-json.ts';
import { HTMLRewriterScrapeDocument } from './src/libraries/html-rewriter-scrape-document.ts';

const rw = new HTMLRewriterScrapeDocument();

const response = await fetch(
  'https://www.rfebm.com/competiciones/competicion.php'
);

const tableRow = 'body > div.table-responsive > table > tbody *';
rw.addHandlers(
  'table',
  tableParserAsJSON(tableRow),
  genericTableMapToTypedTable([
    'local',
    'visitor',
    'teams',
    'result',
    'datetime',
    'court',
    'tv',
    'previous',
    'streaming',
    'live',
    'livedata',
    'stats',
    'status',
    'oficial_report',
  ])
);

const result = rw.scrape(response).table; // table is the alias given in addHandlers

console.log({ result });

Output example when parsing a table


{
  result: [
    {
      "14": {
        td: [
          {
            attrsEntries: [
              [ "class", "negrita p-t-20" ]
            ]
          }
        ],
        a: [
          {
            attrsEntries: [
              [ "href", "#" ], [ "onclick", "mostrarActaFormal(1291431)" ]
            ]
          }
        ],
        span: [
          {
            attrsEntries: [
              [ "class", "label label-info" ]
            ],
            text: "VER ACTA"
          }
        ]
      },
      local: {
        tr: [
          {
            attrsEntries: []
          }
        ]
      },
      visitor: {
        td: [
          {
            attrsEntries: [
              [ "class", "celda_peque p-t-15" ]
            ]
          }
        ],
        a: [
          {
            attrsEntries: [
              [ "href", "equipo.php?seleccion=0&id_equipo=209083&id=1017101" ]
            ]
          }
        ],
        img: [
          {
            attrsEntries: [
              [ "src", "http://balonmano.isquad.es/images/afiliacion_clubs/857/square_653864366c64616b3361.jpg"
              ], [ "class", "escudo_tabla" ]
            ]
          }
        ]
      },
      teams: {
        td: [
          {
            attrsEntries: [
              [ "class", "celda_peque p-t-15" ]
            ]
          }
        ],
        a: [
          {
            attrsEntries: [
              [ "href", "equipo.php?seleccion=0&id_equipo=209035&id=1017101" ]
            ]
          }
        ],
        img: [
          {
            attrsEntries: [
              [ "src", "http://balonmano.isquad.es/images/afiliacion_clubs/305/square_74396b6a72766a626963.jpg"
              ], [ "class", "escudo_tabla" ]
            ]
          }
        ],
        span: [
          {
            attrsEntries: [
              [ "class", "cuchufleta" ], [ "style", "display: none;" ]
            ]
          }
        ],
        pre: [
          {
            attrsEntries: []
          }
        ]
      },
      result: {
        td: [
          {
            attrsEntries: [
              [ "class", "p-t-20" ]
            ]
          }
        ],
        a: [
          {
            attrsEntries: [
              [ "class", "" ], [ "href", "equipo.php?seleccion=0&id_equipo=209083&id=1017101"
              ]
            ],
            text: "Prado Marianistas - "
          }, {
            attrsEntries: [
              [ "class", "negrita" ], [ "href", "equipo.php?seleccion=0&id_equipo=209035&id=1017101"
              ]
            ],
            text: "BM SANSE"
          }
        ]
      },
      datetime: {
        td: [
          {
            attrsEntries: [
              [ "class", "centrado p-t-20" ]
            ]
          }
        ],
        span: [
          {
            attrsEntries: [
              [ "class", "" ]
            ],
            text: "19 -"
          }, {
            attrsEntries: [
              [ "class", "negrita" ]
            ],
            text: " 27"
          }
        ]
      },
      court: {
        td: [
          {
            attrsEntries: []
          }
        ],
        div: [
          {
            attrsEntries: [
              [ "class", "negrita" ]
            ],
            text: "21/05/2023"
          }, {
            attrsEntries: [],
            text: "10:30 "
          }
        ]
      },
      tv: {
        td: [
          {
            attrsEntries: [
              [ "class", "negrita p-t-20" ]
            ]
          }
        ],
        a: [
          {
            attrsEntries: [
              [ "href", "https://www.google.com/maps/?q=42.6593719083639,-8.11761953439327"
              ], [ "target", "_blank" ]
            ]
          }
        ],
        span: [
          {
            attrsEntries: [
              [ "class", "glyphicon glyphicon-map-marker" ], [ "aria-hidden", "true" ]
            ],
            text: " &nbsp;PAVILLÓN LALÍN ARENA "
          }
        ]
      },
      previous: {
        td: [
          {
            attrsEntries: [
              [ "class", "centrado p-t-20" ]
            ]
          }
        ]
      },
      streaming: {
        td: [
          {
            attrsEntries: [
              [ "class", "p-t-20" ]
            ]
          }
        ],
        a: [
          {
            attrsEntries: [
              [ "href", "#" ], [ "onclick", "mostrarPrevio(1291431)" ]
            ]
          }
        ],
        span: [
          {
            attrsEntries: [
              [ "class", "label label-primary" ]
            ],
            text: "PREVIO"
          }
        ]
      },
      live: {
        td: [
          {
            attrsEntries: [
              [ "class", "p-t-20" ]
            ]
          }
        ],
        a: [
          {
            attrsEntries: [
              [ "href", "https://youtube.com/live/4gLWI_3m3y4?feature=share" ], [ "target",
                "_blank" ]
            ]
          }
        ],
        span: [
          {
            attrsEntries: [
              [ "class", "label label-success" ]
            ],
            text: "STREAMING"
          }
        ]
      },
      livedata: {
        td: [
          {
            attrsEntries: [
              [ "class", "negrita p-t-20" ]
            ]
          }
        ],
        a: [
          {
            attrsEntries: [
              [ "href", "#" ], [ "onclick", "mostrarActa(1291431)" ]
            ]
          }
        ],
        span: [
          {
            attrsEntries: [
              [ "class", "label label-info" ]
            ],
            text: "DIRECTO"
          }
        ]
      },
      stats: {
        td: [
          {
            attrsEntries: [
              [ "class", "negrita p-t-20" ]
            ]
          }
        ],
        a: [
          {
            attrsEntries: [
              [ "href", "#" ], [ "onclick", "window.open(\"//balonmano.misquad.es/estadisticas_pdc_pdf.php?id=1291431&token=4d3f95997750adbee8fadd82a7272efb&sec=0471022ebf9a7f52719c208c4da47557\");"
              ]
            ]
          }
        ],
        span: [
          {
            attrsEntries: [
              [ "class", "label label-info" ]
            ],
            text: "DATOS LIVE"
          }
        ]
      },
      status: {
        td: [
          {
            attrsEntries: [
              [ "class", "negrita p-t-20" ]
            ],
            text: " "
          }
        ],
        a: [
          {
            attrsEntries: [
              [ "href", "#" ], [ "onclick", "window.open(\"//balonmano.misquad.es/estadisticas_pdc.php?id=1291431&id_equipo=209083&token=4d3f95997750adbee8fadd82a7272efb&sec=0471022ebf9a7f52719c208c4da47557\");"
              ]
            ]
          }, {
            attrsEntries: [
              [ "href", "#" ], [ "onclick", "window.open(\"//balonmano.misquad.es/estadisticas_pdc.php?id=1291431&id_equipo=209035&token=4d3f95997750adbee8fadd82a7272efb&sec=0471022ebf9a7f52719c208c4da47557\");"
              ]
            ]
          }
        ],
        span: [
          {
            attrsEntries: [
              [ "class", "label label-info" ]
            ],
            text: "LOCAL"
          }, {
            attrsEntries: [
              [ "class", "label label-info" ], [ "style", "margin-left: 5px;" ]
            ],
            text: "VISIT."
          }
        ]
      },
      oficial_report: {
        td: [
          {
            attrsEntries: [
              [ "class", "p-t-20" ]
            ]
          }
        ],
        span: [
          {
            attrsEntries: [
              [ "class", "label label-success" ]
            ],
            text: "FINALIZADO"
          }
        ]
      }
    }, {
      "14": {
        td: [
          {
            attrsEntries: [
              [ "class", "negrita p-t-20" ]
            ]
          }
        ],
        a: [
          {
            attrsEntries: [
              [ "href", "#" ], [ "onclick", "mostrarActaFormal(1291432)" ]
            ]
          }
        ],
        span: [
          {
            attrsEntries: [
              [ "class", "label label-info" ]
            ],
            text: "VER ACTA"
          }
        ]
      },
      local: {
        tr: [
          {
            attrsEntries: []
          }
        ]
      },
      visitor: {
        td: [
          {
            attrsEntries: [
              [ "class", "celda_peque p-t-15" ]
            ]
          }
        ],
        a: [
          {
            attrsEntries: [
              [ "href", "equipo.php?seleccion=0&id_equipo=205087&id=1017101" ]
            ]
          }
        ],
        img: [
          {
            attrsEntries: [
              [ "src", "http://balonmano.isquad.es/images/afiliacion_clubs/269/square_6e323338383761617937.jpg"
              ], [ "class", "escudo_tabla" ]
            ]
          }
        ]
      },
      teams: {
        td: [
          {
            attrsEntries: [
              [ "class", "celda_peque p-t-15" ]
            ]
          }
        ],
        a: [
          {
            attrsEntries: [
              [ "href", "equipo.php?seleccion=0&id_equipo=203695&id=1017101" ]
            ]
          }
        ],
        img: [
          {
            attrsEntries: [
              [ "src", "http://balonmano.isquad.es/images/afiliacion_clubs/380/square_39753176353763756539.jpg"
              ], [ "class", "escudo_tabla" ]
            ]
          }
        ],
        span: [
          {
            attrsEntries: [
              [ "class", "cuchufleta" ], [ "style", "display: none;" ]
            ]
          }
        ],
        pre: [
          {
            attrsEntries: []
          }
        ]
      },
      result: {
        td: [
          {
            attrsEntries: [
              [ "class", "p-t-20" ]
            ]
          }
        ],
        a: [
          {
            attrsEntries: [
              [ "class", "negrita" ], [ "href", "equipo.php?seleccion=0&id_equipo=205087&id=1017101"
              ]
            ],
            text: "VAYRO LALÍN - "
          }, {
            attrsEntries: [
              [ "class", "" ], [ "href", "equipo.php?seleccion=0&id_equipo=203695&id=1017101"
              ]
            ],
            text: "C.BM. MISLATA"
          }
        ]
      },
      datetime: {
        td: [
          {
            attrsEntries: [
              [ "class", "centrado p-t-20" ]
            ]
          }
        ],
        span: [
          {
            attrsEntries: [
              [ "class", "negrita" ]
            ],
            text: "30 -"
          }, {
            attrsEntries: [
              [ "class", "" ]
            ],
            text: " 25"
          }
        ]
      },
      court: {
        td: [
          {
            attrsEntries: []
          }
        ],
        div: [
          {
            attrsEntries: [
              [ "class", "negrita" ]
            ],
            text: "21/05/2023"
          }, {
            attrsEntries: [],
            text: "12:30 "
          }
        ]
      },
      tv: {
        td: [
          {
            attrsEntries: [
              [ "class", "negrita p-t-20" ]
            ]
          }
        ],
        a: [
          {
            attrsEntries: [
              [ "href", "https://www.google.com/maps/?q=42.6593719083639,-8.11761953439327"
              ], [ "target", "_blank" ]
            ]
          }
        ],
        span: [
          {
            attrsEntries: [
              [ "class", "glyphicon glyphicon-map-marker" ], [ "aria-hidden", "true" ]
            ],
            text: " &nbsp;PAVILLÓN LALÍN ARENA "
          }
        ]
      },
      previous: {
        td: [
          {
            attrsEntries: [
              [ "class", "centrado p-t-20" ]
            ]
          }
        ]
      },
      streaming: {
        td: [
          {
            attrsEntries: [
              [ "class", "p-t-20" ]
            ]
          }
        ],
        a: [
          {
            attrsEntries: [
              [ "href", "#" ], [ "onclick", "mostrarPrevio(1291432)" ]
            ]
          }
        ],
        span: [
          {
            attrsEntries: [
              [ "class", "label label-primary" ]
            ],
            text: "PREVIO"
          }
        ]
      },
      live: {
        td: [
          {
            attrsEntries: [
              [ "class", "p-t-20" ]
            ]
          }
        ],
        a: [
          {
            attrsEntries: [
              [ "href", "https://youtube.com/live/kXLfsx98PNc?feature=share" ], [ "target",
                "_blank" ]
            ]
          }
        ],
        span: [
          {
            attrsEntries: [
              [ "class", "label label-success" ]
            ],
            text: "STREAMING"
          }
        ]
      },
      livedata: {
        td: [
          {
            attrsEntries: [
              [ "class", "negrita p-t-20" ]
            ]
          }
        ],
        a: [
          {
            attrsEntries: [
              [ "href", "#" ], [ "onclick", "mostrarActa(1291432)" ]
            ]
          }
        ],
        span: [
          {
            attrsEntries: [
              [ "class", "label label-info" ]
            ],
            text: "DIRECTO"
          }
        ]
      },
      stats: {
        td: [
          {
            attrsEntries: [
              [ "class", "negrita p-t-20" ]
            ]
          }
        ],
        a: [
          {
            attrsEntries: [
              [ "href", "#" ], [ "onclick", "window.open(\"//balonmano.misquad.es/estadisticas_pdc_pdf.php?id=1291432&token=6561e8bd54145760a7296abc49fd2d9d&sec=0471022ebf9a7f52719c208c4da47557\");"
              ]
            ]
          }
        ],
        span: [
          {
            attrsEntries: [
              [ "class", "label label-info" ]
            ],
            text: "DATOS LIVE"
          }
        ]
      },
      status: {
        td: [
          {
            attrsEntries: [
              [ "class", "negrita p-t-20" ]
            ],
            text: " "
          }
        ],
        a: [
          {
            attrsEntries: [
              [ "href", "#" ], [ "onclick", "window.open(\"//balonmano.misquad.es/estadisticas_pdc.php?id=1291432&id_equipo=205087&token=6561e8bd54145760a7296abc49fd2d9d&sec=0471022ebf9a7f52719c208c4da47557\");"
              ]
            ]
          }, {
            attrsEntries: [
              [ "href", "#" ], [ "onclick", "window.open(\"//balonmano.misquad.es/estadisticas_pdc.php?id=1291432&id_equipo=203695&token=6561e8bd54145760a7296abc49fd2d9d&sec=0471022ebf9a7f52719c208c4da47557\");"
              ]
            ]
          }
        ],
        span: [
          {
            attrsEntries: [
              [ "class", "label label-info" ]
            ],
            text: "LOCAL"
          }, {
            attrsEntries: [
              [ "class", "label label-info" ], [ "style", "margin-left: 5px;" ]
            ],
            text: "VISIT."
          }
        ]
      },
      oficial_report: {
        td: [
          {
            attrsEntries: [
              [ "class", "p-t-20" ]
            ]
          }
        ],
        span: [
          {
            attrsEntries: [
              [ "class", "label label-success" ]
            ],
            text: "FINALIZADO"
          }
        ]
      }
    }
  ]
}

@gtrabanco
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You can add multiple handlers and will provide you all the data in the aliases you give.

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