javascript - Protractor :如何在 ui-grid 中滚动几次

Question

我正在尝试编写滚动到表中后一行的函数。 ui-grid 在行中无限滚动。

我找到了解释滚动到最后一个元素的答案，但我的表格在一次滚动后有许多隐藏元素，我需要一个解决方案来滚动整个网格。 ( Protractor: Scrolling a table and testing for infinite scroll )

解决方案:How to getText from all rows & columns in an infinite scrolling ng-grid using protractor - 对我没有帮助

我的网格是:

<div class="ui-grid-viewport ng-isolate-scope" ng-style="colContainer.getViewportStyle()" role="rowgroup" ui-grid-viewport="" style="overflow-x: hidden; overflow-y: scroll;">
<div class="ui-grid-canvas">
   <div class="ui-grid-row ng-scope" ng-style="Viewport.rowStyle(rowRenderIndex)" ng-repeat="(rowRenderIndex, row) in rowContainer.renderedRows track by $index" style="margin-top: 630px;">
   <div class="ui-grid-row ng-scope" ng-style="Viewport.rowStyle(rowRenderIndex)" ng-repeat="(rowRenderIndex, row) in rowContainer.renderedRows track by $index">
   <div class="ui-grid-row ng-scope" ng-style="Viewport.rowStyle(rowRenderIndex)" ng-repeat="(rowRenderIndex, row) in rowContainer.renderedRows track by $index">
   <div class="ui-grid-row ng-scope" ng-style="Viewport.rowStyle(rowRenderIndex)" ng-repeat="(rowRenderIndex, row) in rowContainer.renderedRows track by $index">
   <div class="ui-grid-row ng-scope" ng-style="Viewport.rowStyle(rowRenderIndex)" ng-repeat="(rowRenderIndex, row) in rowContainer.renderedRows track by $index">
   <div class="ui-grid-row ng-scope" ng-style="Viewport.rowStyle(rowRenderIndex)" ng-repeat="(rowRenderIndex, row) in rowContainer.renderedRows track by $index">
   <div class="ui-grid-row ng-scope" ng-style="Viewport.rowStyle(rowRenderIndex)" ng-repeat="(rowRenderIndex, row) in rowContainer.renderedRows track by $index">
   <div class="ui-grid-row ng-scope" ng-style="Viewport.rowStyle(rowRenderIndex)" ng-repeat="(rowRenderIndex, row) in rowContainer.renderedRows track by $index">
   <div class="ui-grid-row ng-scope" ng-style="Viewport.rowStyle(rowRenderIndex)" ng-repeat="(rowRenderIndex, row) in rowContainer.renderedRows track by $index">
   <div class="ui-grid-row ng-scope" ng-style="Viewport.rowStyle(rowRenderIndex)" ng-repeat="(rowRenderIndex, row) in rowContainer.renderedRows track by $index">
   <div class="ui-grid-row ng-scope" ng-style="Viewport.rowStyle(rowRenderIndex)" ng-repeat="(rowRenderIndex, row) in rowContainer.renderedRows track by $index">
   <div class="ui-grid-row ng-scope" ng-style="Viewport.rowStyle(rowRenderIndex)" ng-repeat="(rowRenderIndex, row) in rowContainer.renderedRows track by $index">
   <div class="ui-grid-row ng-scope" ng-style="Viewport.rowStyle(rowRenderIndex)" ng-repeat="(rowRenderIndex, row) in rowContainer.renderedRows track by $index">
   <div class="ui-grid-row ng-scope" ng-style="Viewport.rowStyle(rowRenderIndex)" ng-repeat="(rowRenderIndex, row) in rowContainer.renderedRows track by $index">
   <div class="ui-grid-row ng-scope" ng-style="Viewport.rowStyle(rowRenderIndex)" ng-repeat="(rowRenderIndex, row) in rowContainer.renderedRows track by $index">
   <div class="ui-grid-row ng-scope" ng-style="Viewport.rowStyle(rowRenderIndex)" ng-repeat="(rowRenderIndex, row) in rowContainer.renderedRows track by $index">
   <div class="ui-grid-row ng-scope" ng-style="Viewport.rowStyle(rowRenderIndex)" ng-repeat="(rowRenderIndex, row) in rowContainer.renderedRows track by $index">
   <div class="ui-grid-row ng-scope" ng-style="Viewport.rowStyle(rowRenderIndex)" ng-repeat="(rowRenderIndex, row) in rowContainer.renderedRows track by $index">
   <div class="ui-grid-row ng-scope" ng-style="Viewport.rowStyle(rowRenderIndex)" ng-repeat="(rowRenderIndex, row) in rowContainer.renderedRows track by $index">
   <div class="ui-grid-row ng-scope" ng-style="Viewport.rowStyle(rowRenderIndex)" ng-repeat="(rowRenderIndex, row) in rowContainer.renderedRows track by $index">
   <div class="ui-grid-row ng-scope" ng-style="Viewport.rowStyle(rowRenderIndex)" ng-repeat="(rowRenderIndex, row) in rowContainer.renderedRows track by $index" style="">
   <div class="ui-grid-row ng-scope" ng-style="Viewport.rowStyle(rowRenderIndex)" ng-repeat="(rowRenderIndex, row) in rowContainer.renderedRows track by $index">
   <div class="ui-grid-row ng-scope" ng-style="Viewport.rowStyle(rowRenderIndex)" ng-repeat="(rowRenderIndex, row) in rowContainer.renderedRows track by $index">
   <div class="ui-grid-row ng-scope" ng-style="Viewport.rowStyle(rowRenderIndex)" ng-repeat="(rowRenderIndex, row) in rowContainer.renderedRows track by $index">
   </div>
</div>

根据案例，DOM 中有 24 行可见，65 行隐藏。

我的算法是“滚动”，而顶部元素和“最后一个”元素之间的滚动距离不会改变(并收集所有必要的文本)，但 WHILE 主体无法正常工作，它只滚动一次:

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);

            });


        }


    });

非常感谢任何帮助或想法，

提前致谢。

Answer 1

好的，经过长时间的研究，我有了答案。问题是 promise (通常 :))。感谢这篇文章 ( While loop using bluebird promises )，我的解决方案如下:

     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!
     }