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非同期な自動再試行をネイティブのPromiseを用いて実装

More than 5 years have passed since last update.

…できてるのかどうか分からないんだけど、用途を絞っちゃう場合はこんな感じでいいの?

3000ミリ秒後にコンソールに出力される例
<!DOCTYPE html>
<html>
    <head>
        <script>
            var RetryableQuerySelector = function self(selector, maxRetries, delay) {
                return new Promise(function (resolve) {
                    var element = document.querySelector(selector);
                    if (element) {
                        resolve(element);
                    } else if (maxRetries-- > 0) {
                        setTimeout(function () {
                            self(selector, maxRetries, delay).then(function (element) {
                                return resolve(element);
                            });
                        }, delay);
                    } else {
                        console.error('Failed to select: ' + selector);
                    }
                });
            };
            RetryableQuerySelector('div', 5, 1000).then(function (element) {
                console.log(element);
            });
            setTimeout(function () {
                document.body.appendChild(document.createElement('div'));
            }, 3000);
        </script>
    </head>
    <body>
    </body>
</html>

もっと一般的な実装の仕方がよく分からないので、詳しい方おられましたらコメントや編集リクエストお願いします…

書きました

mpyw
古い記事はそのまま参考にしないようにご注意ください
synapse
Synapseは、オンラインサロンサービスにおけるパイオニアとして、かつて存在していたスタートアップです。
https://synapseam.github.io/
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