Expression
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The expression widget displays text or the result of an expression at runtime. It's similar to the print command in other programming languages. To use the expression widget:
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In the widget toolbar, search for expression and drag the widget to a screen, block or placeholder. The expression editor opens.
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Enter an expression in the expression editor and click Done.
You can use one of these examples as the expression:
"Hello, world!""1 + 2 = " + (1 + 2)"The square root of 3 is " + Sqrt(3)"Today is " + CurrDate() + "!"ToUpper("this is text in uppercase")
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Publish the app and open the screen.
Here is what you get if you use one of the examples in the previous step:
- Hello, world!
- 1 + 2 = 3
- The square root of 3 is 1.73205080756887729352744634151
- Today is 2020-10-08!!
- THIS IS TEXT IN UPPERCASE
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Properties
| Name | Description | Mandatory | Default value | Observations |
|---|---|---|---|---|
| Name | Identifies an element in the scope where it's defined, like a screen, action, or module. | Yes | ||
| Value | Combination of values, operands, operators and variables or the result of a function, computed at runtime. | Yes | ||
| Example | Text displayed in the Preview and Design modes. | |||
| Style Classes | Specifies one or more style classes to apply to the widget. Separate multiple values with spaces. | |||
| Attributes | ||||
| Property | Name of an attribute to add to the HTML translation for this element. | You can pick a property from the drop-down list or type a free text. The name of the property isn't validated by the platform. Duplicated properties aren't allowed. Spaces, " or ' are also not allowed. |
||
| Value | Value of the attribute. | You can type the value directly or write expressions using the Expression Editor. If the Value is empty, the corresponding HTML tag is property="property". For example, the nowrap property doesn't require a value, therefore its value is nowrap="nowrap". |
||
Events
| Name | Description | Mandatory | Observations |
|---|---|---|---|
| Event | JavaScript or custom event to handle. | ||
| Handler | JavaScript event handler. |
Runtime properties
| Name | Description | Read Only | Type | Observations |
|---|---|---|---|---|
| Id | Identifies the widget instance at runtime (HTML 'id' attribute). You can use it in JavaScript and Extended Properties. | Yes | Text |