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image-loaded-promise

v1.0.0

Published

要素の画像読込みを待つぞ

Readme

image-loaded-promise

なにこれ

要素の画像読み込みを待つ。
Lazy Load対応。

使い方

$ npm i image-loaded-promise
import imageLoadedPromise from 'image-loaded-promise';

// or CDN, Dynamic import
const {default: Mod} = await import('https://cdn.rawgit.com/honeo/image-loaded-promise/master/image-loaded.min.mjs');



// img.srcを監視
await imageLoadedPromise(img);

// background-imageを監視
await imageLoadedPromise(div);

// PNG画像がURLに設定されるまで待ってから監視
await imageLoadedPromise(img, /\.png$/);

API

imageLoadedPromise(element [, regexp])

引数1要素の画像読み込みを監視する。
読み込み終了時に要素を引数に解决するpromiseを返す。

  • 引数2に正規表現があるとき

    • 要素にそれとmatchする画像URLが設定されるまで待機する。
  • 既に要素の画像読込が終了しているとき

    • 即座に解決する。
  • 要素にsrc属性やbackground-Imageが未設定なとき

    • 要素に画像URLが設定されるまで待機する。

注意