JavaScript Synchronous Loop Example

javascript-synchronous-loop.js

function doSynchronousLoop(data, processData, done) {
    if (data.length > 0) {
        var loop = function (data, i, processData, done) {
            processData(data[i], i, function () {
                if (++i < data.length) {
                    setTimeout(function () {
                        loop(data, i, processData, done);
                    }, 0);
                } else {
                    done();
                }
            });
        };
        loop(data, 0, processData, done);
    } else {
        done();
    }
}

var checkboxes = document.getElementsByClassName("ChkPattern");
doSynchronousLoop(checkboxes,
    function (item, i, callback) {
        console.log(item.checked);
        if (item.checked == false) {
            setTimeout(function () { item.click(); callback() }, 100);
        } else {
            callback();
        }
    },
    function () { console.log("finished"); }
);