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---
layout: default
class: Macro
title: js (';' JAVASCRIPT )*
summary: Execute Javascript, return the value of the last expression
---
ScriptEngine engine = new ScriptEngineManager().getEngineByName("javascript");
ScriptContext context = null;
Bindings bindings = null;
StringWriter stdout = new StringWriter();
StringWriter stderr = new StringWriter();
static String _js = "${js [;<js expr>...]}";
public Object _js(String args[]) throws Exception {
verifyCommand(args, _js, null, 2, Integer.MAX_VALUE);
StringBuilder sb = new StringBuilder();
for (int i = 1; i < args.length; i++)
sb.append(args[i]).append(';');
if (context == null) {
context = engine.getContext();
bindings = context.getBindings(ScriptContext.ENGINE_SCOPE);
bindings.put("domain", domain);
String javascript = domain.mergeProperties("javascript", ";");
if (javascript != null && javascript.length() > 0) {
engine.eval(javascript, context);
}
context.setErrorWriter(stderr);
context.setWriter(stdout);
}
Object eval = engine.eval(sb.toString(), context);
StringBuffer buffer = stdout.getBuffer();
if (buffer.length() > 0) {
domain.error("Executing js: %s: %s", sb, buffer);
buffer.setLength(0);
}
if (eval != null) {
return toString(eval);
}
String out = stdout.toString();
stdout.getBuffer().setLength(0);
return out;
}
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