How to I get a count of a selector and pass into a variable I can use later?

Question

I am looking to get a row count of items returned so I can later add a filter to the list. Then I will assert that the filtered list number is less than the total number.

I have tried a number of .perform and .execute arrangements and continue to get undefined errors.

module.exports = {
    'Verify rows': function (browser) {
        var value_id = 0;
        browser
            .url(browser.launchUrl)
            .waitForElementVisible('body', 20000)
            .pause(4000)
            .verify.visible('div:nth-of-type(2) > form > div > div > div > div')
            .assert.gdGreater('.offering-item-container', 0)
            .execute(function () {
                value_id = document.querySelectorAll('.offering-item-container').length;
            })
            .click('#IsGuaranteedToRun')
            .pause(4000)
            .assert.gdLess('#IsGuaranteedToRun', value_id)
    }

};

Answer 1

I found an answer here that helped point me in the right direction. Then I had to include the next steps within the callback.

module.exports = {
    'Verify rows': function (browser) {
        var value_id = 0;
        browser
            .url(browser.launchUrl)
            .waitForElementVisible('body', 20000)
            .pause(4000);
            const numElementsPromise = new Promise(resolve => {
                browser.elements('css selector', '.offering-item-container', result => {
                    resolve(result.value.length);
                });
            });

        numElementsPromise.then(result => {
            value_id = result;
            browser
                .pause(4000)
                .verify.visible('div:nth-of-type(2) > form > div > div > div > div')
                .assert.gdGreater('.offering-item-container', 0)
                .click('#IsGuaranteedToRun')
                .pause(4000)
                .assert.gdLess('.offering-item-container', value_id)
                .click('#IsGuaranteedToRun')
                .assert.gdEquals('.offering-item-container', value_id);
        });
  }

};