<textfield/>

Description

The text field widget is a basic labeled input widget with a small area for text representing an int, decimal or string basic data type.

Is allows for binding of values to basic variables or attributes of objects instances in a unit.

It also allows for binding to a variable, object instance attribute or function in order to determine if the widget is hidden or not.

The title is specified as a key to a lang file entry and is required.

In addition, the text field widget provides a datatype attribute that can be used to slightly alter the behaviour of the text field widget. Possible values and their related behaviour is as follows:

Note that when the text field is bound to a variable of type int it will behave as though datatype="number" has been specified even though it hasn't.

Example

Implied number datatype

The abbreviated code snippets and screenshot below shows the use of <textfield/> with a value binding to an object instance attribute and a visibility binding to a unit function. It uses the default datatype behaviour.

 <textfield label="textfield.quantity_to_purchase">
	<visible function="showPurchaseForm"/>
    <binding variable="farmerPurchase">
		<attribute name="purchaseQuantity"/>
	<binding/>
</textfield>

FarmerPurchase farmerPurchase;
bool makingPurchase;
bool stockItemSelected;

void init() {
    farmerPurchase = FarmerPurchase:new();
    makingPurchase = true;
    stockItemSelected = false;
}
.
.
.
bool showPurchaseForm() {
    if(makingPurchase == true && stockItemSelected == true) {
        return true;
    }
    return false;
}

 textfield.quantity_to_purchase = Quantity to purchase:

Password datatype

<textfield label="textfield.password" datatype="password">
    <binding variable="userPassword"/>
</textfield>

Implied text datatype

persistent object SystemAdmin {
    
    @requiredFieldValidator("validator.required_field")
    string firstName;
    .
    .
}

<textfield label="textfield.first_name">
    <binding variable="systemAdmin">
        <attribute name="firstName"/>
    </binding>
</textfield>

Additional Mentions and References

• Devoted section to the text field widget in the Helium Tutorial Lesson 3: User Input, Persistence, Validation, and Tables (continued)
• Devoted sub section to the datatype attribute in the Helium Tutorial Lesson 3: User Input, Persistence, Validation, and Tables (continued)
• Helium DSL and View Quick Reference