ractive-ez-table/lib/utils.js

Ractive Ez UI Table

const utils = {

    hasOwnProperty(obj, key) {
        return obj != null && {}.hasOwnProperty.call(obj, key);
    },

    prop1(path) {
        return obj => utils.hasOwnProperty(obj, path) 
            ? obj[path] 
            : null;
    },

    prop(path) {
        const chain = path.split(".");
        const proto = Object.prototype;
        if (chain.length == 1) return utils.prop1(path);

        return obj => {
            for (let i = 0; i < chain.length; i++) {
                const key = chain[i];

                if (!utils.hasOwnProperty(obj, key)) return null;
                obj = obj[key];
            }
            return obj;
        };
    },

    indexOf(items, path, value) {
        const prop = utils.prop(path);

        for (let i = 0; i < items.length; i++) {
            if (prop(items[i]) == value) return i;
        }

        return -1;
    },

    find(items, path, value) {
        const index = utils.indexOf(items, path, value);
        return index == -1
            ? null
            : items[index];
    },

    compare(a, b) {
        if (a == b) return 0;
        if (a < b) return -1;
        return 1;
    },

    setImmediate(callback) {
        window.setImmediate
            ? window.setImmediate(callback)
            : setTimeout(callback, 0);
    },
	
	createScrollHandler(callback, ms = 100) {
		let didScroll = false;
		let timer = null;
		
		return event => {
			didScroll = true;
			if (timer == null) {
				timer = setTimeout(() => {
					if (didScroll) {
						didScroll = false;
						callback();
					}
					
					clearTimeout(timer);
					timer = null;
				}, ms);
			}
		};
	}

};

export default utils;