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Building Advanced Reports
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The dialog box looks like this:
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If you preview the report at this time, you see the report parameter, but because the report definition hasn t been changed yet to use its value, nothing happens if you try to change the value.
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A report parameter is an object in the Parameters collection that you can access using either its Value or Label property. The Value property retrieves the current value of the parameter, whereas the Label property retrieves the user-friendly name for the parameter that is defined in the list of available values. Using Microsoft Visual Basic collection syntax, you can refer to a report parameter in any expression. In this procedure, you will modify the expressions that conditionally format the margin percentage so that they use the report parameter value instead of a fixed value.
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Change conditional formatting with a report parameter
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Click the Margin % cell, which is the cell in the sixth column of the third row (the details row).
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Notice the Expression button to the right of the Default Value input box. You can click this button to build an expression that calculates the default value rather than use a fixed value. 14 Click the OK button.
Building Advanced Reports
13 Enter a default value: .15.
Part 2
Authoring Reports
3 Building Advanced Reports Abbrev. Title Abbrev. Title Abbrev. Title
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In the Properties window, click Expression in the Color property for the Margin % cell. Position the cursor after the greater than symbol (<), and then, while pressing SHIFT, use the Right Arrow button to select 0.15. Expand the Parameters collection in the Fields list. Each time you add a report parameter to the report, a new member is added to the Parameters collection for you to use in an expression. Click MarginPercent, and then click the Insert button. The Edit Expression dialog box looks like this:
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The MarginPercent parameter value, which can be changed at run time by the user, replaces the fixed value of 0.15. Now the conditional formatting will depend on the value of the parameter supplied by the user to determine whether the margin percentage value in the report is displayed in red or black. Copy the expression to the Clipboard so that you can easily update the footer rows, and then click the OK button. Click the Margin % cell in the table1_SubCategory footer, and then while pressing the CTRL key, click the same cell in the table1_Category footer and in the table footer to select all three cells. Paste the expression from the Clipboard into the Color property. Select only the Margin % cell in the table footer, click Expression in the Color property list box, and then edit the expression to replace Black with White, as shown here:
=IIf(Me.Value<Parameters!MarginPercent.Value, "Red", "White")
In the table footer, the background is black. If the text color is also black, the margin percentage will not be visible to users when its value is greater than the value supplied for the report parameter.
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Building Advanced Reports
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You didn t provide a list of available values for this parameter, so a parameter input box is displayed above the report, preceded by its prompt string (Margin %). Because the report parameter has a default value, the report is rendered on demand and the default value is displayed in the parameter s input box. 11 Enter 0.35 for Margin %, and then click the View Report button. Clicking the View Report button renders the report using the new report parameter value, and now you can see the Full-Finger Gloves, L and the category footer rendered with a red font.
Allowing a null value for the report parameter is perfectly fine if the expression will evaluate correctly. If you want to allow the user to render this report without any conditional formatting, you can select the report parameter option Allow Null Value. Then, when the report renders, a NULL check box appears next to the Margin % parameter. If the user were to select the NULL check box, the expression would return false for all rows because none of the rows has a margin percentage that is less than null. The false result for the expression would cause all rows to display the margin percentage in black, except the table footer which would display in white, which effectively removes conditional formatting from the report.
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