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| Table of Contents |
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Description
The binding element provides a mechanism in Helium with which to bind values submitted from input widgets to unit variables of a base type or attributes of object instance unit variables. It also provides a way to bind functions to widgets in order to use the values returned from these functions in the widgets.
Example
Binding directly to a unit variable
| Code Block | ||||
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<datefield label="select.date_of_stocktake">
<binding variable="selectedDateOfStocktake"/>
</datefield> |
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date selectedDateOfStocktake;
void init() {
selectedDateOfStocktake = Mez:now();
} |
Binding to a unit variable attribute
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<info label="info.first_name">
<binding variable="farmer">
<attribute name="firstName"/>
</binding>
</info> |
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Farmer farmer;
void init() {
Farmer = Farmer:new();
.
.
} |
Binding to a function
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<info label="info.email_address">
<binding function="getSystemAdminEmailAddress"/>
</info> |
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SystemAdmin currentSystemAdminUser;
void init() {
currentSystemAdminUser = SystemAdmin:user();
.
.
}
string getSystemAdminEmailAddress() {
return currentSystemAdminUser.emailAddress;
} |
Additional Mentions and References
- Used in multiple lessons in the Helium Tutorial with first mention in Lesson 1: A Basic Helium App
- Multiple examples in the Helium Quick Reference