ref: 7318098a6068e312c787eca834baef3daf03a642
parent: 0bb8f448b325722a804566b0557824f3a7ec2fcd
author: Tor Andersson <tor.andersson@gmail.com>
date: Tue Jan 17 17:18:00 EST 2017
Add a simple example.
--- a/docs/examples.html
+++ b/docs/examples.html
@@ -75,6 +75,35 @@
js_setglobal(J, "t");
</pre>
+<h2>Callbacks from C to JS (by name)</h2>
+
+<pre>
+static int call_callback(js_State *J, const char *arg1, int arg2)
+{+ int result;
+
+ /* Find the function to call. */
+ js_getglobal(J, "my_callback");
+
+ /* Push arguments to function. */
+ js_pushnull(J); /* the 'this' object to use */
+ js_pushstring(J, arg1);
+ js_pushnumber(J, arg2);
+
+ /* Call function and check for exceptions. */
+ if (js_pcall(J, 2)) {+ fprintf(stderr, "an exception occurred in the javascript callback\n");
+ js_pop(J, 1);
+ return -1;
+ }
+
+ /* Retrieve return value. */
+ result = js_tonumber(J, -1);
+ js_pop(J, 1);
+
+ return result;
+}
+
<h2>Callbacks from C to JS</h2>
<pre>