质面线图不可见

Question

这是我的。xhtml

<div id="detailed_div_graph" align="center">
            <p:lineChart id="linear" value="#{ChartBean.linearModel}" legendPosition="e" 
                title="Medical Data" minY="0" maxY="10" style="height:300px"/>
        </div>

我的ChartBean代码:

public class ChartBean implements Serializable {
private CartesianChartModel linearModel;
public ChartBean() {  
    createLinearModel();  
}
public CartesianChartModel getLinearModel() {  
    return linearModel;  
} 
private void createLinearModel() {  
    linearModel = new CartesianChartModel();  
    LineChartSeries series1 = new LineChartSeries();  
    series1.setLabel("BP");  
    series1.set(1, 2);  
    series1.set(2, 1);  
    series1.set(3, 3);  
    series1.set(4, 6);  
    series1.set(5, 8);  
    linearModel.addSeries(series1);  
}  
}

我的代码有什么问题?

Answer 1

这里假定将调用这个构造函数。

public ChartBean() {  
    createLinearModel();  
}

Jsf有阶段，您应该考虑到它们。

如果您希望在bean初始化之后首先调用createLinearModel()方法，您应该使用@PostConstruct annotation对其进行注释

@PostConstruct 
private void createLinearModel(){
    ...
}