taro-code/lib/common/canvas/element.js

Taro.js barcode & qrcode, Image & Canvas

import Taro from '@tarojs/taro';
const getElement = async (id, rootSelector) => {
    if (Taro.getEnv() === Taro.ENV_TYPE.WEB) {
        const canvasWrap = document.getElementById(id);
        const canvas = canvasWrap.children[0];
        return await Promise.resolve(canvas);
    }
    else {
        return await new Promise((resolve) => {
            const selector = rootSelector != null ? `${rootSelector} >>> #${id}` : `#${id}`;
            Taro.createSelectorQuery()
                .select(selector)
                .fields({ node: true, size: true })
                .exec((res) => {
                var _a;
                if (((_a = res[0]) === null || _a === void 0 ? void 0 : _a.node) != null) {
                    const canvas = res[0].node;
                    resolve(canvas);
                }
                else {
                    resolve(undefined);
                }
            });
        });
    }
};
export const waitForElement = async (id, rootSelector, step = 0) => {
    try {
        const canvas = await getElement(id, rootSelector);
        if (canvas != null) {
            return canvas;
        }
        else {
            if (step + 1 < 100) {
                await new Promise((resolve) => setTimeout(resolve, 10));
                return await waitForElement(id, rootSelector, step + 1);
            }
        }
    }
    catch (error) { }
};
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