Javascript 绘图更新数据

Plotly update data

提问by Marc Rasmussen

Okay so i have the following code:

好的，所以我有以下代码：

    var element = document.getElementById(scope.changeid);

function getData(division,redraw) {
    var employeeData = [];
    if (!division) {
        $http.get(api.getUrl('competenceUserAverageByMyDivisions', null)).success(function (response) {
            processData(response,redraw);
        });
    }
    else {
        $http.get(api.getUrl('competenceUserAverageByDivision', division)).success(function (response) {
            processData(response,redraw);
        })
    }

}

function processData(data,redraw) {
    var y = [],
        x1 = [],
        x2 = [];

    data.forEach(function (item) {
        y.push(item.user.profile.firstname);
        x1.push(item.current_level);
        x2.push(item.expected);
    });

    var charData = [{
            x: x1,
            y: y,
            type: 'bar',
            orientation: 'h',

            name: 'Nuv?rende'
        }, {
            x: x2,
            y: y,
            type: 'bar',
            orientation: 'h',

            name: 'Forventet'
        }],
        layout = {
            barmode: 'stack',
            legend: {
                traceorder: 'reversed',
                orientation: 'h'

            }
        };

    if(!redraw){
        Plotly.plot(element, charData, layout);
    }
    else
    {
        Plotly.redraw(element,charData,layout);
    }
}

scope.$watch('divisionId', function (newValue, oldValue) {
    if (newValue) {
        getData(newValue.id,true);
    }
}, true);

getData(null,false);

Which creates the following chart:

这将创建以下图表：

Now as you can see ive added a watcher

现在你可以看到我添加了一个 watcher

            scope.$watch('divisionId', function (newValue, oldValue) {
            if (newValue) {
                getData(newValue.id,true);
            }
        }, true);

Now when i trigger this it should update the chart and call Plotly.redraw(element,charData,layout);

现在，当我触发它时，它应该更新图表并调用 Plotly.redraw(element,charData,layout);

However when it does this the chart does not change at all. There is no error in the console so i am not quite sure what to do?

然而，当它这样做时，图表根本不会改变。控制台中没有错误，所以我不太确定该怎么办？

采纳答案by Marc Rasmussen

I found the answer to the question.

我找到了问题的答案。

Apprently i needed to use:

显然我需要使用：

 Plotly.newPlot(element,charData,layout);

instead of redraw

代替 redraw

回答by Honghe.Wu

Plotly.redraw(gd)is the right way.
But you call Plotly.redrawincorrectly.
The right way is update the dataobject, instead of new a dataobject.

Plotly.redraw(gd)是正确的方法。
但是你叫Plotly.redraw错了。
正确的方法是更新data对象，而不是新data对象。

var data = [ {
    x: ['VALUE 1'], // in reality I have more values... 
    y: [20], 
    type: 'bar'
}
]; 
Plotly.newPlot('PlotlyTest', data); function adjustValue1(value) {
    data[0]['y'][0] = value; 
    Plotly.redraw('PlotlyTest');
}

Ref: http://www.mzan.com/article/35946484-most-performant-way-to-update-graph-with-new-data-with-plotly.shtml

参考：http: //www.mzan.com/article/35946484-most-performant-way-to-update-graph-with-new-data-with-plotly.shtml

回答by Safwan

According to a Plotly community moderator (see the first answer here), Plotly.restyleis faster than Plotly.redrawand Plotly.newPlot.

根据 Plotly 社区版主的说法（请参阅此处的第一个答案），Plotly.restyle比Plotly.redraw和快Plotly.newPlot。

Example taken from the link:

来自链接的示例：

var data = [{
    x: ['VALUE 1'], // in reality I have more values...
    y: [20],
    type: 'bar'
}];
Plotly.newPlot('PlotlyTest', data);

function adjustValue1(value)
{
    Plotly.restyle('PlotlyTest', 'y', [[value]]);
}

回答by Andrei

The extendTraces function should be what you are aiming for. It can add data points to your graph and redraws it. In contrast to redraw (@Honghe.Wu Answer), you do not need to update the reference when using extendTraces.

extendTraces 函数应该是您的目标。它可以向您的图形添加数据点并重新绘制它。与重绘（@Honghe.Wu 答案）相反，使用extendTraces 时不需要更新引用。

[extendTraces] This function has comparable performance to Plotly.react and is faster than redrawing the whole plot with Plotly.newPlot.

[extendTraces] 该函数的性能与 Plotly.react 相当，并且比使用 Plotly.newPlot 重新绘制整个图更快。

https://plot.ly/javascript/plotlyjs-function-reference/#plotlyextendtraces

https://plot.ly/javascript/plotlyjs-function-reference/#plotlyextendtraces

Example usage

示例用法

// initialise some data beforehand
var y = [];
for (var i = 0; i < 20; i ++) {
    y[i] = Math.random();
}

var trace = {
    // x: x,
    y: y,
    type: 'bar',
  };
var data = [trace];
// create the plotly graph
Plotly.newPlot('graph', data);

setInterval(function() {
  // add data to the trace via function call
  Plotly.extendTraces('graph', { y: [[getData()]] }, [0]);
  // y.push(getData()); Plotly.redraw('graph'); //similar effect
}, 400);

function getData() {
     return Math.random();
}