使用google图表处理javascript对象

我正试图绘制一个基于以下JSON的谷歌可视化饼图。我遇到了一些问题，因为谷歌使用数字数据，而不仅仅是普通对象

例如，我想要一个基于用例的饼图。饼图将列出VDI、升级、演示，并显示其占总数的比例。请帮忙

下面是JSON示例 [{Id:0，处理时间：2012/01，批准人：zoo，POC:POC1，用例：VDI}，{Id:0，处理时间：2012/02，批准人：zoo，POC:POC1，用例：Upgrade}，{Id:0，处理时间：2012/03，批准人：zoo，POC:POC2，用例：DEMO}，{Id:0，处理时间：2012/04，批准人：victor，POC:POC2，用例：DEMO}，{Id:0，处理时间：2012/05，批准人：victor，POC3，用例：DEMO}，{Id:0，处理时间：2012/06，批准人：victor，POC:POC3，用例：升级}，{Id:0，处理时间：2012/05，批准人：tom，POC:POC3，用例：VDI}，{Id:0，处理时间：2012/06，批准人：tom，POC:POC3，用例：升级}]

// Full source
google.setOnLoadCallback(drawChart);

function drawChart() {
    $.get('/Home/GetData', {},
function (data) {
var tdata = new google.visualization.DataTable();

tdata.addColumn('string', 'UseCase');
tdata.addColumn('int', 'Count');


// Reservation based on UseCase
var ReservationByUseCase = [];
for (var i = 0; i < data.length; i++) {
    var d = data[i];

    // If not part of array.. Add it
    if ($.inArray(d.UseCase, ReservationByUseCase) === -1)
    {
        var UseCaseValue = d.UseCase;
        var UseCaseCountValue = 1;
        ReservationByUseCase.push({ UseCase: UseCaseValue, UseCaseCount: UseCaseCountValue });
    }

    // If part of the array.. Increase count
    if ($.inArray(d.UseCase, ReservationByUseCase) !== -1) {
        var cUseCase = ReservationByUseCase[$.inArray(d.UseCase, ReservationByUseCase)];
        cUseCase.UseCaseCount = cUseCase.UseCaseCount + 1;

        ReservationByUseCase[$.inArray(d.UseCase, ReservationByUseCase)] = cUseCase
    }

}

for (var i = 0; i < ReservationByUseCase.length; i++) {
    tdata.addColumn(ReservationByUseCase[i].UseCaseValue, ReservationByUseCase[i].UseCaseCountValue)
    alert(ReservationByUseCase[i].UseCaseValue);
    alert(ReservationByUseCase[i].UseCaseCountValue);
}

var options = {
    title: "Reservations"
};

var chart = new google.visualization.PieChart(document.getElementById('chart_div'));
chart.draw(tdata, options);
});
}

---

您只需循环浏览数据并将每个用例相加：

var ndata = {}

var data = [{"Id":0,"ProcessedTime":"2012/01","Approver":"zoo","POC":"POC1","UseCase":"VDI"},{"Id":0,"ProcessedTime":"2012/02","Approver":"zoo","POC":"POC1","UseCase":"Upgrade"},{"Id":0,"ProcessedTime":"2012/03","Approver":"zoo","POC":"POC2","UseCase":"DEMO"},{"Id":0,"ProcessedTime":"2012/04","Approver":"victor","POC":"POC2","UseCase":"DEMO"},{"Id":0,"ProcessedTime":"2012/05","Approver":"victor","POC":"POC3","UseCase":"VDI"},{"Id":0,"ProcessedTime":"2012/06","Approver":"victor","POC":"POC3","UseCase":"Upgrade"},{"Id":0,"ProcessedTime":"2012/05","Approver":"tom","POC":"POC3","UseCase":"VDI"},{"Id":0,"ProcessedTime":"2012/06","Approver":"tom","POC":"POC3","UseCase":"Upgrade"}];

for (i = 0; i < data.length; i++) {
    var d = data[i];
    if (ndata[d["UseCase"]] == null) {
      ndata[d["UseCase"]] = 1
    } else {
      ndata[d["UseCase"]] = ndata[d["UseCase"]] + 1
    }
}

console.log(ndata);

---

这里有一把小提琴：

这就是我想到的……这有用吗

// Reservation based on UseCase
var ReservationByUseCase = [];
for (var i = 0; i < data.length; i++) {
    var d = data[i];

    // If not part of array.. Add it
    if ($.inArray(d.UseCase, ReservationByUseCase) === -1)
    {
        var UseCaseValue = d.UseCase;
        var UseCaseCountValue = 1;
        ReservationByUseCase.push({ UseCase: UseCaseValue, UseCaseCount: UseCaseCountValue });
    }

    // If part of the array.. Increase count
    if ($.inArray(d.UseCase, ReservationByUseCase) !== -1) {
        var cUseCase = ReservationByUseCase[$.inArray(d.UseCase, ReservationByUseCase)];
        cUseCase.UseCaseCount = cUseCase.UseCaseCount + 1;

        ReservationByUseCase[$.inArray(d.UseCase, ReservationByUseCase)] = cUseCase
    }

}

---

谢谢你的帮助！我想这已经接近解决我的问题了。这是你能以更可读的格式给我这一行的方式吗？我有C语言的经验，但对javascript不熟悉。ndata[d[UseCase]]=ndata[d[UseCase]]==null？1:ndata[d[UseCase]]+1；当然，它只是说：如果这是真的？分配这个：否则分配这个谢谢你重写上面的代码。这很有帮助。我确实对这行有疑问。这是在检查ndata数组中是否存在d.usecase吗？非常感谢。。我对这种语法不是很熟悉。我想我回到了第一步。我发布了完整的源代码。请帮助。