THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
Tapestry uses property expressions to move data between components. Property expressions are the basis of the component parameters and template expansions.
| Div | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| ||||||||||
|
...
- Whitespace is ignored.
- Integers and decimals may have a leading sign ('+' or '-').
- Constants are in base 10 (octal and hex notation is not yet supported). Decimals may contain a decimal point (exponent notation not yet supported).
- Literal strings are enclosed in single quotes.
- The
rangeOpcreates a range object that will iterate between the two values. The upper and lower bounds may be literal integers, or property expressions. - An identifier by itself is a property name. An identifier with parenthesis is a method invocation.
- Property names, method names, and keywords are case-insensitive.
- 'this' is the root object (i.e., the containing component).
- The
notoperator coerces the expression to aboolean(so it can be used on strings, numbers, etc.). - Method matching is based on method name and number of parameters, but not parameter types. The TypeCoercer service is used to convert parameters to the correct type to be passed into the method.
...
| Example | Notes |
|---|---|---|
Keyword | this |
|
Keyword | null |
|
Property Name | userName | Calls getUserName() or setUserName, depending on context |
Property Chain | user.address.city | Calls getUser().getAddress().getCity() or getUser().getAddress().setCity(), depending on context |
Property Chain | user?.name | Calls getUser() and, if the result is not null, calls getName() on the result |
Method Invocation | groupList.size() | calls getGroupList().size() |
Method Invocation | members.findById(user.id)?.name | Calls getMembers().findById(getUser().getId())?.getName() (unless findById returns null) |
Range | 1..10 | Iterates between integers 1 and 10 |
Range | 1..groupList.size() | Iterates between 1 and the result of getGroupList().size() |
Literal String | 'Beer is proof that God loves us and wants us to be happy.' | Use single quotes |
List | [user.name, user.email, user.phone] |
|
Not Operator | ! user.deleted | the boolean negation of getUser().getDeleted() |
Not, Coerced | ! user.middleName | true only if getUser.getMiddleName() returns null or an empty string |
Map | { 'framework' : 'Tapestry', 'version' : version } | Keys are string literals (in single quotes), but could be properties as well |