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Simple Wait For Document Helper

A Simple helper library for wait document load

Verzia zo dňa 22.10.2018. Pozri najnovšiu verziu.

Tento skript by nemal byť nainštalovaný priamo. Je to knižnica pre ďalšie skripty, ktorú by mali používať cez meta príkaz // @require https://updategreasyfork.deno.dev/scripts/373524/639009/Simple%20Wait%20For%20Document%20Helper.js 

/**
 * Simple Wait For Document Helper
 * by Jixun<https://jixun.moe/>
 */
var waitForDocument = (function () {
  var callbackQueue = []
  var ready = false

  function waitForDocument(callback) {
    if (ready) {
      requestAnimationFrame(callback)
      return
    }

    callbackQueue.push(callback)
  }

  function triggerCallbackQueue() {
    if (ready === true) {
      // Already processed
      return
    }

    ready = true

    // process callback queue
    callbackQueue.forEach(requestAnimationFrame)
    callbackQueue = null

    // remove those listeners
    document.removeEventListener('DOMContentLoaded', triggerCallbackQueue)
    document.removeEventListener('load', triggerCallbackQueue)
  }

  // listen for document loaded events
  document.addEventListener('DOMContentLoaded', triggerCallbackQueue)
  document.addEventListener('load', triggerCallbackQueue)

  // check if document is ready yet
  if (['interactive', 'complete'].indexOf(document.readyState) !== -1) {
    triggerCallbackQueue()
  }

  return waitForDocument
})()