Metric selectors

Introduction

Selectors can be used to switch between metrics. In that case they are called metric selectors.

Creating a Metric selector

Note: You must first create the metrics that you want to use in the selector.

Follow these steps to create a metric selector.

Step	Action
1	In the table item list, right-click on the table for which you want to create a metric selector and select New control - Selector.... A selector New selector is added in the table item list.
2	Double click on New selector to open the Edit Control dialog.
3	Right click in the Selector items pane an click on Add....
4	Select the metrics you want to add to the selector and click on OK.
5	If desired, you can set a Default value for the selector by adding the expression `uid([default metric])`.
6	Disable the checkbox Allow empty selection to enforce that either one of the available metrics from the selector is selected, and click on OK.

Using the Metric selector on a chart

Follow these steps to add the metric selector on a chart

Step	Action
1	Go to the Dashboards tab and create a new dashboard based on the table in which the metric selector control is present.
2	Go to the Chart tab.
3	Select the attribute you want to display in the chart from the Rows drop down list.
4	Select the metric selector control from the Metric drop down list.
5	Drag the metric selector control to the Header controls of the chart.

See illustration below for an example.

In the example the metric selector contains three metrics. By selecting a different metric in the selector, the size of the bars of the chart also change.

Note: The default value to be displayed for a chart is the number of records. If you use a metric selector you must also create a metric for the default value if you want this as one of the available display options.

Using the Metric selector on a legacy chart

To use the metric selector on a legacy chart you must create an expression that contains the following functions.

Function	Description
`Selecteduids`	Returns the list of UIDs (unique identifiers) of the current selection of the metric selector.
`Any`	Selects one item from that list. Note: the metric selector used can only select one value at a time.
`Metric`	Evaluate the selected metric. The metric function accepts either a metric or the UID of a metric.

For example: metric(any(selecteduids(FilterMetric_selector))).

Follow these steps to add the metric selector on a legacy chart.

Step	Action
1	Go to the Dashboards tab and create a new dashboard based on the table in which the metric control is present.
2	Go to the Chart tab.
3	Drag the attribute you want to display in the chart to the Rows level.
4	Drag the Metric selector control to the Header controls panel.
5	Change the Size to Expression.
6	Click on `expression` and enter the expression containing the elements described above.
7	Click on OK.

On this page

Introduction
Creating a Metric selector
Using the Metric selector on a chart
Using the Metric selector on a legacy chart

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