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I want to hide a Visualforce Chart if there are no data points. Since PieData is a list of data points, why can I not use the style below?

<apex:page Controller="PieChartController" rendered="{!Piedata.size() > 0}">

Example chart from Salesforce Documentation:

https://developer.salesforce.com/docs/atlas.en-us.pages.meta/pages/pages_charting_overview_simple_example.htm

public class PieChartController {
public List<PieWedgeData> getPieData() {
    List<PieWedgeData> data = new List<PieWedgeData>();
    data.add(new PieWedgeData('Jan', 30));
    data.add(new PieWedgeData('Feb', 15));
    data.add(new PieWedgeData('Mar', 10));
    data.add(new PieWedgeData('Apr', 20));
    data.add(new PieWedgeData('May', 20));
    data.add(new PieWedgeData('Jun', 5));
    return data;
}

// Wrapper class
public class PieWedgeData {

    public String name { get; set; }
    public Integer data { get; set; }

    public PieWedgeData(String name, Integer data) {
        this.name = name;
        this.data = data;
    }
}
} 
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2 Answers 2

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There is a syntax issue in your code, your condition will work if you make a small change.

<apex:page ... rendered="{!Piedata.size() > 0}">

This will not work as it is not a formula as required in VF page.

Change it to. <apex:page ... rendered="{!Piedata.size > 0}">

You can also use .empty property as well <apex:page ... rendered="{!Piedata.empty}">.

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Change to rendered="{!Piedata.size>0}"

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