Rust Requires Chilkat v11.4.0+

Eval JavaScript Returning String

See more JavaScript Examples

Demonstrates getting the completion value of a JavaScript that returns a string. Rust

// This example demonstrates getting the completion value of a script,
// where the last evaluated expression is a string.

// The Javascript run in this example is shown below.

// Load the JavaScript from a file.
let sb_script = chilkat::StringBuilder::new();
if sb_script.load_file("js_eval_return_string.js", "utf-8").is_err() {
    println!("{}", sb_script.last_error_text());
    return;
}

let js = chilkat::Js::new();
let result = chilkat::JsonObject::new();

// Run the JavaScript
// Eval returns the completion value of the script. This is generally the value of the last evaluated expression.
// In this case, the last evaluated expression is a string.
if js.eval(&sb_script, &result).is_err() {
    println!("{}", js.last_error_text());
    return;
}

result.set_emit_compact(false);
println!("{}", result.emit().unwrap_or_default());

// Output:

// {
//   "type": "string",
//   "value": "Ready for Chilkat.Js"
// }

JavaScript

var status = "Ready";
var system = "Chilkat.Js";

// The last statement is an expression
status + " for " + system;