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A Modern Equivalent to MXML? Exploring Svelte and JSX

In the heyday of Flex, MXML was magic.

You could declare your UI in a clean, readable, XML-like syntax. Need a data grid? Just drop it in. Want two-way binding? It was built-in. MXML let you build complex UIs fast, with structure and clarity.

Fast forward to today: XML is out, but the declarative spirit lives on—in frameworks like Svelte and React (JSX).

Let’s explore how these modern tools compare to MXML—and whether they’ve finally cracked the code on that elusive “developer joy.”

🏛️ MXML: The Blueprint of UIs

Here’s a simple example of MXML for a login form:

xml
<mx:Form>
<mx:FormItem label="Username">
<mx:TextInput id="username"/>
</mx:FormItem>
<mx:FormItem label="Password">
<mx:TextInput id="password" displayAsPassword="true"/>
</mx:FormItem>
<mx:Button label="Login" click="login()"/>
</mx:Form>

Everything—layout, events, components—was declarative. It was tightly integrated with ActionScript for logic, and worked like a compiled language: structure + behavior = app.

⚛️ JSX: The React Revolution

React introduced JSX, an HTML-in-JavaScript syntax that redefined component-driven development.

Here’s the same login form in React:

jsx
<form onSubmit={handleLogin}>
<label>
Username:
<input type="text" value={username} onChange={e => setUsername(e.target.value)} />
</label>
<label>
Password:
<input type="password" value={password} onChange={e => setPassword(e.target.value)} />
</label>
<button type="submit">Login</button>
</form>

Pros:

  • Full control with JavaScript

  • Component-driven

  • Ecosystem of hooks and libraries

Cons:

  • Lots of boilerplate

  • Binding is manual (vs. automatic in MXML)

  • Styling and layout are separate concerns

JSX is powerful, but not always ergonomic—especially compared to the simplicity of MXML for quick prototyping.

đź”® Svelte: The Spiritual Successor?

Then came Svelte. It’s not just a framework—it’s a compiler. Svelte feels like Flex in spirit: fast, simple, and powerful out of the box.

svelte
<script>
let username = '';
let password = '';function login() {
// Your login logic
}
</script>

<form on:submit|preventDefault={login}>
<label>
Username:
<input bind:value={username} />
</label>
<label>
Password:
<input type=”password” bind:value={password} />
</label>
<button type=”submit”>Login</button>
</form>

What’s familiar:

  • Declarative UI (like MXML)

  • Two-way binding with bind:

  • Reactive updates

  • Component encapsulation

  • CSS scoped inside components

Svelte is the closest thing we have today to the ease and expressiveness of MXML—without the plugin baggage.

🧠 MXML’s Influence Lives On

We may not write XML anymore, but the core ideas of MXML are very much alive:

  • Declarative UI

  • Data binding

  • Componentization

  • Rapid iteration

Modern devs just use <script> and <style> tags instead of <mx:Script> and <mx:Style>. And the best modern tools—Svelte, Vue, even React with JSX—are rediscovering what MXML pioneered.

🚀 What’s Next for UI Syntax?

As we look to the future, we’re seeing a convergence:

  • Svelte simplifies state and UI in a single file.

  • React Server Components reimagine rendering pipelines.

  • Web Components strive for interoperability.

But no matter how modern the stack, the dream remains the same: write less, build more, and make the web sing.

MXML was ahead of its time. Svelte may be its spiritual successor. And here at FlexandAir.com, we’re keeping that dream alive—by blending the lessons of the past with the power of the present.

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