Migrating from `v0.2.x` to `v1.x`
=================================

`v1.x` is largely API-compatible with `v0.2.x`, but there are a few breaking changes.

- [`config` function](#config-function)
- [Cancelling redraw from event handlers](#cancelling-redraw-from-event-handlers)
- [Component `controller` function](#component-controller-function)
- [Passing components to `m()`](#passing-components-to-m)

## `config` function

In `v0.2.x` mithril provided a single lifecycle method, `config`. `v1.x` provides much more fine-grained control over the lifecycle of a vnode.

### `v0.2.x`

```js
m("div", {
    config : function(element, isInitialized) {
        // runs on each redraw
        // isInitialized is a boolean representing if the node has been added to the DOM
    }
});
```

### `v1.x`

More documentation on these new methods is available in [lifecycle-methods.md](lifecycle-methods.md).

```js
m("div", {
    // Called before the DOM node is created
    oninit : function(vnode) { ... },
    // Called after the DOM node is created
    oncreate : function(vnode) { ... },
    // Called before the node is updated, return false to cancel
    onbeforeupdate : function(vnode, old) { ... },
    // Called after the node is updated
    onupdate : function(vnode) { ... },
    // Called before the node is removed, call done() when ready for the node to be removed from the DOM
    onbeforeremove : function(vnode, done) { ... },
    // Called before the node is removed, but after onbeforeremove calls done()
    onremove : function(vnode) { ... }
});
```

If available the DOM-Element of the vnode can be accessed at `vnode.dom`.

## Cancelling redraw from event handlers

`m.mount()` and `m.route()` still automatically redraw after a DOM event handler runs. Cancelling these redraws from within your event handlers is now done by setting the `redraw` property on the passed-in event object to `false`.

### `v0.2.x`

```js
m("div", {
    onclick : function(e) {
        m.redraw.strategy("none");
    }
})
```

### `v1.x`

```js
m("div", {
    onclick : function(e) {
        e.redraw = false;
    }
})
```

## Component `controller` function

In `v1.x` there is no more `controller` property in components, use `oninit` instead.

### `v0.2.x`

```js
m.mount(document.body, {
    controller : function() {
        var ctrl = this;
        
        ctrl.fooga = 1;
    },
    
    view : function(ctrl) {
        return m("p", ctrl.fooga);
    }
});
```

### `v1.x`

```js
m.mount(document.body, {
    oninit : function(vnode) {
        vnode.state.fooga = 1;
    },
    
    view : function(vnode) {
        return m("p", vnode.state.fooga);
    }
});

// OR

m.mount(document.body, {
    oninit : function(vnode) {
        var ctrl = this;  // this is bound to vnode.state by default
        
        ctrl.fooga = 1;
    },
    
    view : function(vnode) {
        var ctrl = this; // this is bound to vnode.state by default
        
        return m("p", ctrl.fooga);
    }
});
```

## Passing components to `m()`

In `v0.2.x` you could pass components as the second argument of `m()` w/o any wrapping required. To help with consistency in `v1.x` they must always be wrapped with a `m()` invocation.

### `v0.2.x`

```js
m("div", <component>);
```

### `v1.x`

```js
m("div", m(<component>));
```