Unity Script Reference – Application.ExternalCall

Application.ExternalCall

static function ExternalCall (functionName : String, params args : object[]) : void

Description

Calls a function in the containing web page (Web Player only).

This will call JavaScript function functionName in the web page that contains the web player, passing given arguments to it. Supported argument types are the primitive types (string, int, float, char) and arrays of them. Any other objects are converted to string (using ToString method) and passed as strings.

The function is called non-blocking, i.e. ExternalCall immediately returns without waiting for the function that was called to complete.

The number of passed arguments can be varying:

JavaScript

    // Calls MyFunction1 in web page with no arguments
    Application.ExternalCall ("MyFunction1");
    // Calls MyFunction2 in web page with a string
    Application.ExternalCall ("MyFunction2", "Hello from Unity!");
    // Calls MyFunction3 in web page with several arguments of different types
    Application.ExternalCall ("MyFunction3", "one", 2, 3.0);

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    void Example() {
        Application.ExternalCall("MyFunction1");
        Application.ExternalCall("MyFunction2", "Hello from Unity!");
        Application.ExternalCall("MyFunction3", "one", 2, 3.0F);
    }
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

    def Example():
        Application.ExternalCall('MyFunction1')
        Application.ExternalCall('MyFunction2', 'Hello from Unity!')
        Application.ExternalCall('MyFunction3', 'one', 2, 3.0F)

The functions to be called are just declared in the HTML page using standard syntax, for example: // This should be contained in the host page in the appropriate <script> element.
// Using the above call from Unity, this will receive
// "Hello from Unity!" as the argument.
function MyFunction2( arg )
{
alert( arg );
}