Protractor: How to scroll a few times in ui-grid

Question

I am trying to write function which scrolls to a latter row in a table. The ui-grid has infinite scrolling through the rows.

I have found answers that explain scrolling to a last element, but my table has many hidden elements after an one scrolling and I need a solution to scroll through the full grid. (Protractor: Scrolling a table and testing for infinite scroll)

The solution: How to getText from all rows & columns in an infinite scrolling ng-grid using protractor - doesn't help me

My grid is:




According to the case, there are 24 rows visible in DOM and 65 hidden.

My algorithm is "to scroll" while a scrolled distance between top element and "last" element won't be changed (and collect all necessary text), but the WHILE body does not work properly, it scrolls one time only:

this.tableContent = function tableContent() {      

    //for loop
    var start = {};
    var distance = {};
    var lastRow = {};     
    var div = element(by.css('div.ui-grid-viewport'));
    lastRow.elm = element.all(by.css('div.ui-grid-row')).last();

    browser.executeScript("return arguments[0].scrollTop;", lastRow.elm.getWebElement()).then(function (dst) {
        return distance.value = dst;       
    }).then(function () { 


        while (start.value !== distance.value) {
            //console.log('The distance before scrolling ' + dst);


            start.value = distance.value;

            //scroll
            browser.executeScript("arguments[0].scrollIntoView();", lastRow.elm.getWebElement());
            browser.wait(protractor.ExpectedConditions.presenceOf(element.all(by.css('div.ui-grid-row')).last()), 1000);

            lastRow.elm = element.all(by.css('div.ui-grid-row')).last();


            browser.executeScript("return arguments[0].scrollTop;", div.getWebElement()).then(function (dst) {

                //console.log('the distance after scroll is ' + dst)
                return distance.value = dst;

            }).then(function () {

                console.log('the distance is ' + distance.value);
                console.log('The start.value is ' + start.value);

            });


        }


    });


Any help or idea are highly appreciated, 

thanks in advance.

Nadin · Accepted Answer

OK, After a long research I have an answer. The problem is promises (as usually :)). Thanks for this article (While loop using bluebird promises), my solution that works for me is below:

     var promiseWhile = Promise.method(function (condition, action) {
        if (!condition()) return;
        return action().then(promiseWhile.bind(null, condition, action));
    });

    lastRow.elm = element.all(by.css('div.ui-grid-row')).last();


    browser.executeScript("return arguments[0].scrollTop;", lastRow.elm.getWebElement()).then(function (dst) {
        return distance.value = dst;

    })
    .then(function () {


        promiseWhile(function () {

            // Condition for stopping
            return start.value !== distance.value;

        }, function () {
                start.value = distance.value;

                return collectData().then(function () { 

                    //scroll
                    browser.executeScript("arguments[0].scrollIntoView();", lastRow.elm.getWebElement());
                    browser.wait(protractor.ExpectedConditions.presenceOf(element.all(by.css('div.ui-grid-row')).last()), 1000);

                    lastRow.elm = element.all(by.css('div.ui-grid-row')).last();
                    browser.executeScript("return arguments[0].scrollTop;", div.getWebElement()).then(function (dst) {
                        distance.value = dst;
                    });

                });

            });
        });




    var collectData = function collectData() { 

        // HERE COLLECT YOUR DATA and don't forget return result!
     }

Protractor: How to scroll a few times in ui-grid

Answers (2)

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