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Page Design Controls 249 An XPath expression that should evaluate to true() or false(). If the expression evaluates to false()—and only if it evaluates to false()—is the control not visible. If the expression evaluates to true() or returns some other value, then the control is visible. The default is true(). Double-click inside the value field, or click the XPath button, to enter or edit an XPath expression. The Visible property can be used to render an object visible or not depending upon whether an XPath expression evaluates to true(). As a result, the display of an object can be made to be dynamically dependent on the content or structure of data. Note: The $MTControlValue variable is not available for the evaluation of the Visible property. If it is used, then a validation error results. Enabled/Editable The control is either enabled or disabled, according to whether the value of the property is true (enabled) or false (disabled). The value can be entered directly (by selecting it in the combo box or by double-clicking in the value field and entering the value you want). The value can also be an XPath expression that evaluates to boolean true or false. The default value is true. Typically the XPath expression of the Enabled/Editable property of a control would check the presence or value of a node. If the expression evaluates to true, the control will be enabled. Text Color Sets the color of the control's text. You can do one of the following to select the color: Click the color palette to select a text color Select a color from the dropdown list of the combo box Double-click in the value field to enter a color code (for example, #FF0000), or click the XPath toolbar button and enter an XPath expression to generate the required text Text Size Select a size from the dropdown list of the combo box, or double-click in the value field to enter a text size. Bold Text Select true or false from the dropdown list of the combo box. Default is false. Italic Text Select true or false from the dropdown list of the combo box. Default is false. Underline Text Select true or false from the dropdown list of the combo box. Default is false. Background Color Sets the background color of the object. You can do one of the following to select the color: Click the color palette to select a background color Select a color from the dropdown list of the combo box Double-click in the value field to enter a color code (for example, #FF0000), or click the XPath toolbar button and enter an XPath expression to generate the required © 2015 Altova Gmb H Altova MobileTogether Designer
