Home Web Front-end JS Tutorial Call JavaScript or be called by JavaScript

Call JavaScript or be called by JavaScript

Nov 25, 2016 pm 01:37 PM

1. Calling Flex methods in JavaScript
In Flex, you can use ExternalInterface to call Flex methods by adding specified public methods to the list of callable methods in the Flex application. A method can be added to this list by calling addCallback() in a Flex application. addCallback registers an ActionScript method as a method that JavaScript and VBScript can call. The definition of the
addCallback() function is as follows:
addCallback(function_name:String, closure:Function):void The
function_name parameter is the method name called by the script in the Html page. The closure parameter is the local method to be called. This parameter can be a method or an object instance.

For example:

import flash.external.*;
public function myFunc():Number {
return 42;
}
public function initApp():void {
ExternalInterface.addCallback ( "myFlexFunction",myFunc);
}

Then in the Html page, first get the reference to the SWF object, that is, the Id attribute of the Swf declared with For example, it is MyFlexApp. Then you can call methods in Flex in the following way.

< ;button onclick="callApp()">Call App

2. Call JavaScript in Flex
You can call JavaScript in the Html page. By interacting with JavaScript, you can change the Style and call remote method. You can also pass the data to the Html page, and then return it to Flex after processing. There are two main methods to complete such a function: ExternalInterface() and navigateToUrl().
The easiest way to call JavaScript in Flex is to use ExternalInterface(). You can use this API to call any JavaScript, pass parameters, and get the return value. If the call fails, Flex throws an exception.
ExternalInterface encapsulates checking of browser support, which can be viewed using the available attribute.
ExternalInterface is very simple to use, the syntax is as follows:
flash.external.ExternalInterface.call(function_name: String[, arg1, ...]):Object;
The parameter function_name is the name of the JavaScript function to be called, and the following parameters are Parameters required by JavaScript.
An example of how to call a JavaScript function
In the Flex application, add the following method:


< mx: Application var f:String = "changeDocumentTitle"; var m:String = ExternalInterface.call(f,"New Title");
trace(m); ="Change Document Title" click="callWrapper()"/>

Html page has the following function definition:

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

What should I do if I encounter garbled code printing for front-end thermal paper receipts? What should I do if I encounter garbled code printing for front-end thermal paper receipts? Apr 04, 2025 pm 02:42 PM

Frequently Asked Questions and Solutions for Front-end Thermal Paper Ticket Printing In Front-end Development, Ticket Printing is a common requirement. However, many developers are implementing...

Demystifying JavaScript: What It Does and Why It Matters Demystifying JavaScript: What It Does and Why It Matters Apr 09, 2025 am 12:07 AM

JavaScript is the cornerstone of modern web development, and its main functions include event-driven programming, dynamic content generation and asynchronous programming. 1) Event-driven programming allows web pages to change dynamically according to user operations. 2) Dynamic content generation allows page content to be adjusted according to conditions. 3) Asynchronous programming ensures that the user interface is not blocked. JavaScript is widely used in web interaction, single-page application and server-side development, greatly improving the flexibility of user experience and cross-platform development.

Who gets paid more Python or JavaScript? Who gets paid more Python or JavaScript? Apr 04, 2025 am 12:09 AM

There is no absolute salary for Python and JavaScript developers, depending on skills and industry needs. 1. Python may be paid more in data science and machine learning. 2. JavaScript has great demand in front-end and full-stack development, and its salary is also considerable. 3. Influencing factors include experience, geographical location, company size and specific skills.

How to merge array elements with the same ID into one object using JavaScript? How to merge array elements with the same ID into one object using JavaScript? Apr 04, 2025 pm 05:09 PM

How to merge array elements with the same ID into one object in JavaScript? When processing data, we often encounter the need to have the same ID...

Is JavaScript hard to learn? Is JavaScript hard to learn? Apr 03, 2025 am 12:20 AM

Learning JavaScript is not difficult, but it is challenging. 1) Understand basic concepts such as variables, data types, functions, etc. 2) Master asynchronous programming and implement it through event loops. 3) Use DOM operations and Promise to handle asynchronous requests. 4) Avoid common mistakes and use debugging techniques. 5) Optimize performance and follow best practices.

How to achieve parallax scrolling and element animation effects, like Shiseido's official website?
or:
How can we achieve the animation effect accompanied by page scrolling like Shiseido's official website? How to achieve parallax scrolling and element animation effects, like Shiseido's official website? or: How can we achieve the animation effect accompanied by page scrolling like Shiseido's official website? Apr 04, 2025 pm 05:36 PM

Discussion on the realization of parallax scrolling and element animation effects in this article will explore how to achieve similar to Shiseido official website (https://www.shiseido.co.jp/sb/wonderland/)...

The difference in console.log output result: Why are the two calls different? The difference in console.log output result: Why are the two calls different? Apr 04, 2025 pm 05:12 PM

In-depth discussion of the root causes of the difference in console.log output. This article will analyze the differences in the output results of console.log function in a piece of code and explain the reasons behind it. �...

How to implement panel drag and drop adjustment function similar to VSCode in front-end development? How to implement panel drag and drop adjustment function similar to VSCode in front-end development? Apr 04, 2025 pm 02:06 PM

Explore the implementation of panel drag and drop adjustment function similar to VSCode in the front-end. In front-end development, how to implement VSCode similar to VSCode...

See all articles