Supported expression syntax

[ultraq]

A list of the expression syntaxes currently supported in the latest version of ThymeleafJS. The full list of expression syntaxes was taken from the Thymeleaf docs here: https://www.thymeleaf.org/doc/tutorials/3.0/usingthymeleaf.html#standard-expression-syntax

Simple expressions

• Variable Expressions: ${...}
• Selection Variable Expressions: *{...}
• Message Expressions: #{...}
• Link URL Expressions: @{...}
• Fragment Expressions: ~{...}

Complex expressions

• Iteration expressions

Literals

• Text literals: 'one text', 'Another one!',...
• Number literals: 0, 34, 3.0, 12.3,...
• Boolean literals: true, false
• Null literal: null
• Literal tokens: one, sometext, main,...

Text operations

• String concatenation: +
• Literal substitutions: |The name is ${name}|

Arithmetic operations

• Binary operators: +, -, *, /, %
• Minus sign (unary operator): -

Boolean operations

• Binary operators:
  • &&
  • and
  • ||
  • or
• Boolean negation (unary operator):
  • !
  • not

Comparisons and equality

• Comparators:
  • >
  • <
  • >=
  • <=
  • gt
  • lt
  • ge
  • le
• Equality operators:
  • ==, ===
  • !=, !==
  • eq
  • ne

Conditional operators

• If-then: (if) ? (then)
• If-then-else: (if) ? (then) : (else)
• Default: (value) ?: (defaultvalue)

Special tokens

• No-Operation: _

[rob-bar]

The message expression is one that would be really handy.
I will have a look on how we can implement it

[rob-bar]

How would we do a .substring now?

[ultraq]

I think you can do a .substring on any string now as both Java and JavaScript both call that method "substring". I haven't tried it with that method in particular, but being able to do method calls on objects is already possible.

[rob-bar]

alright!

[oaj]

Hi, I have a problem

    let templateEngine = new TemplateEngine({
        ...STANDARD_CONFIGURATION,
        messageResolver: async (key, parameters) => resolveMessage(key, lang, 'defaultMessage')
    })

const context = {
user: user
}
templateEngine.processFile(fileName, context)

, it work on tags loike this with #

, but not on variable expressions

    <p th:text="#{email.activation.greeting(${user.firstName})}">
        Dear
    </p>

, this results in - Dear{0}

The templates I have worked fine with spring thymeleaf

Did I forget something ?