MITHRIL.JS

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Installation

In index.html

Add the following script and variable

  <!DOCTYPE html>
  <html lang="en">

  <head>
      <meta charset="UTF-8">
      <meta name="viewport" content="width=device-width, initial-scale=1.0">
      <script defer type="text/javascript" src="https://unpkg.com/mithril/mithril.js"></script>
      <script defer type="text/javascript" src="./JavaScript/index.js"></script>
      <title>Mithril.js</title>
  </head>

  <body>
      <div id="content"></div>
      <main></main>
  </body>

  </html>

Virtual DOM

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Just like in React, Mithril has a virtual DOM that only changes/renders what has been changed (component).

What a Virtual DOM Looks Like?

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  const m = require('mithril');

  console.log(JSON.stringify(m('h1', 'Hello')));
  // {
  //   "tag":"h1",
  //   "attrs":null,
  //   "text":"Hello"
  // }

  console.log(JSON.stringify(m('h1.foo.bar[style=color: red]', 'Hello')));
  // {
  //   "tag": "h1",
  //   "attrs": { "style": "color: red", "className": "foo bar" },
  //   "text": "Hello"
  // }

Inline Styling

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We have 2 ways of inline styling

Chaining

  const Component = {
      view: () => m('h1[style=color:red]', 'Hello Friday!'),
  };

  const outputEl = document.getElementById('output');
  m.mount(outputEl, Component);

Pass as an attribute (an object)

  const Component = {
      view: () => m('h1', { style: 'color:blue' }, 'Hello Friday!'),
  };

  const outputEl = document.getElementById('output');
  m.mount(outputEl, Component);

Render

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To render a new thing into the DOM, we first need to target the element then we add the code

  m.render(document.body, "Hello World")

Mount a New Element

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We can mount a new element/component into the DOM using m.mount()

  const root = document.body;
  const helloComponent = {
      view: () => {
          return m('h1', 'Hello World hello method');
      },
  };

  m.mount(root, helloComponent);

A component is a JavaScript Object with the view method/property

the view method/property is a function that returns a mithril method

  const helloComponent = {
      view: () => {
          return m('h1', 'Hello World hello method');
      },
  };

Element By Id

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  const root = document.body;
  const helloComponent = {
      view: () => {
          return m('h1', 'Hello World hello method');
      },
  };

  m.mount(document.getElementById('content'), helloComponent);

Add a Single Element With a CSS Class

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  const root = document.body;
  m.render(root, m('h1', { class: 'title' }, 'My first app'));

Add Multiple Elements With a CSS Class

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To add multiple elements at the same time, we need to specify as an Array

  const root = document.body;

  m.render(root, [
      m('h1', { class: 'title' }, 'My first app'),
      m('button', 'A button'),
  ]);

Adding To an Existing Element

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Add a multiple elements with a CSS class to an element

  m.render(root, [
      m('main', [
          m('h1', { class: 'main-title' }, 'Main Title'),
          m('button', 'Main Button'),
      ]),
  ]);

Mount vs Render

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The m.mount function is similar to m.render, but instead of rendering some HTML only once, it activates Mithril's auto-redrawing system. To understand what that means, let's add some events:

  let count = 0; // added a variable

  const Hello = {
      view: () => {
          return m('main', [
              m('h1', { class: 'title' }, 'My first app'),
              // changed the next line
              m(
                  'button',
                  {
                      onclick: () => {
                          count++;
                      },
                  },
                  count + ' clicks'
              ),
          ]);
      },
  };

  m.mount(root, Hello);

We defined an onclick event on the button, which increments a variable count (which was declared at the top). We are now also rendering the value of that variable in the button label.
You can now update the label of the button by clicking the button. Since we used m.mount, you don't need to manually call m.render to apply the changes in the count variable to the HTML; Mithril does it for you.

Mithril only touches the parts of the DOM it absolutely needs to. So in our example above, when you click the button, the text in it is the only part of the DOM Mithril actually updates.

Remember that m.render expects a vnode tree, and m.mount expects a component:

  // wrap the component in a m() call for m.render
  m.render(document.body, m(MyComponent))

  // don't wrap the component for m.mount
  m.mount(document.body, MyComponent)

Auto-Redraw System

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The auto-redraw system

Mithril implements a virtual DOM diffing system for fast rendering, and in addition, it offers various mechanisms to gain granular control over the rendering of an application. Mithril employs an auto-redraw system that synchronizes the DOM whenever changes are made in the data layer. The auto-redraw system becomes enabled when you call m.mount or m.route (but it stays disabled if your app is bootstrapped solely via m.render calls). The auto-redraw system simply consists of triggering a re-render function behind the scenes after certain functions complete.

Disable Auto-Redraw

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You can disable an auto-redraw for specific events by setting e.redraw to false.

  const MyComponent = {
      view: function() {
          return m("div", {onclick: doSomething})
      }
  }

  function doSomething(e) {
      e.redraw = false
      // no longer triggers a redraw when the div is clicked
  }

  m.mount(document.body, MyComponent)

After Event Handlers

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Mithril automatically redraws after DOM event handlers that are defined in a Mithril view:

  const MyComponent = {
      view: function() {
          return m("div", {onclick: doSomething})
      }
  }

  function doSomething() {
      // a redraw happens synchronously after this function runs
  }

  m.mount(document.body, MyComponent)

After m.request

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Mithril automatically redraws after m.request completes:

  // Normal promise
  m.request("/api/v1/users").then(function() {
      // a redraw happens after this function runs
  })

  // async/await
  const response = await m.request('/api/v1/users')
  console.log(reponse)

DISABLE AUTO-REDRAW AFTER M.REQUEST

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You can disable an auto-redraw for a specific request by setting the background option to true:

  m.request("/api/v1/users", {background: true}).then(function() {
      // does not trigger a redraw
  })

  const response = await m.request('/api/v1/users', {background: true})

After Route Changes

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Mithril automatically redraws after m.route.set() calls and after route changes via links using m.route.Link.

  const RoutedComponent = {
      view: function() {
          return [
              // a redraw happens asynchronously after the route changes
              m(m.route.Link, {href: "/"}),
              m("div", {
                  onclick: function() {
                      m.route.set("/")
                  }
              }),
          ]
      }
  }

  m.route(document.body, "/", {
      "/": RoutedComponent,
  })

When Mithril Does Dot Redraw

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Methods
- Mithril does not redraw after:
  - setTimeout
  - setInterval
  - requestAnimationFrame
  - raw Promise resolutions
  - 3rd party library event handlers (e.g. Socket.io callbacks).
- In those cases, you must manually call m.redraw().
Lifecycle Methods
- Mithril also does not redraw after lifecycle methods. Parts of the UI may be redrawn after an oninit handler, but other parts of the UI may already have been redrawn when a given oninit handler fires. Handlers like oncreate and onupdate fire after the UI has been redrawn.
- If you need to explicitly trigger a redraw within a lifecycle method, you should call m.redraw(), which will trigger an asynchronous redraw.

  function StableComponent() {
      let height = 0

      return {
          oncreate: function(vnode) {
              height = vnode.dom.offsetHeight
              m.redraw()
          },
          view: function() {
              return m("div", `This component is ${height} px tall`)
          }
      }
  }

vnode trees that are rendered via m.render
- Mithril does not auto-redraw vnode trees that are rendered via m.render. This means redraws do not occur after event changes and m.request calls for templates that were rendered via m.render.
- If your architecture requires manual control over when rendering occurs (as can sometimes be the case when using libraries like Redux), you should use m.render instead of m.mount.
Frequency
- Mithril may also avoid auto-redrawing if the frequency of requested redraws is higher than one animation frame (typically around 16ms).
- This means, for example, that when using fast-firing events like onresize or onscroll
- Mithril will automatically throttle the number of redraws to avoid lag.

view() - Component

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A Mithril component is just an Javascript object with a view function.

  const Hello = {
      view: () => {
          return m('main', [
              m('h1', { class: 'title' }, 'My first app'),
              m('button', 'A button'),
          ]);
      },
  };

m.route() - Route

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Routing just means going from one screen to another in an application with several screens. Let's add a splash page that appears before our click counter. First we create a component for it:

  const Splash = {
      view: () => {
          return m('a', { href: '#!/hello' }, 'Enter!');
      },
  };

As you can see, this component simply renders a link to #!/hello. The #! part is known as a hashbang, and it's a common convention used in Single Page Applications to indicate that the stuff after it (the /hello part) is a route path. Now that we're going to have more than one screen, we use m.route instead of m.mount.

  m.route(root, '/splash', {
      '/splash': Splash,
      '/hello': Hello,
  });

The m.route function still has the same auto-redrawing functionality that m.mount does, and it also enables URL awareness; in other words, it lets Mithril know what to do when it sees a #! in the URL.

The "/splash" right after root means that's the default route
If the hashbang in the URL doesn't point to one of the defined routes (/splash and /hello, in our case), then Mithril redirects to the default route.
So if you open the page in a browser and your URL is https://localhost, then you get redirected to https://localhost/#!/splash.

m.route.link()

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m.route.link - Docs

This component can create a dynamic routable link:

  m(m.route.Link, {href: "/test"})

Using m.route.Link causes the link to behave as a router link - clicking it navigates to the route specified in href, instead of navigating away from the current page to the URL specified in href. You can also set the options passed to m.route.set when the link is clicked by passing the options attribute:

  m(m.route.Link, {href: "/test", options: {replace: true}})

  m(m.route.Link, {
      // Any hyperscript selector is valid here - it's literally passed as the
      // first parameter to `m`.
      selector: "span",
      options: {replace: true},
      href: "/test",
      disabled: false,
      class: "nav-link",
      "data-foo": 1,
      // and other attributes
  }, "link name")

You can also prevent navigation by, in an onclick handler, invoking ev.preventDefault() or returning false. This is the same way you block other events.

  m(m.route.Link, {
      href: "/test",
      onclick: function(e) {
          // Do things...
          if (notReady()) e.preventDefault()
      }
  }, "link name")

This supports full accessibility for both a and button, via a disabled attribute. This ensures no href attribute or onclick handler is set and that an "aria-disabled": "true" attribute is set. If you are passing an onclick handler already, that's dropped. (You can work around this by adding it directly in a lifecycle hook.) The disabled attribute is itself proxied to the element or component, so you can disable routed <button>s and the like.

  // This does the right thing and the accessible thing for you.
  m(m.route.Link, {disabled: disabled, href: "/test"}, "disabled")

  // It renders to this hyperscript, assuming the prefix is the default one:
  m("a", {
      href: "#!/test",
      disabled: disabled,
      "aria-disabled": disabled ? "true" : false,
      onclick: disabled ? null : function(e) {
          // ...
      },
  })

m.request() - XHR (API Calls)

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Basically, XHR is just a way to talk to a server. First we create a function that calls m.request.

method PUT
url specifies an endpoint that represents a resource
body is the payload that we're sending to the endpoint
withCredentials means to enable cookies (indicates that we're using cookies)

  let count = 0;
  const increment = () => {
      m.request({
          method: 'PUT',
          url: '//rem-rest-api.herokuapp.com/api/tutorial/1',
          body: {
            count: count + 1
          },
          withCredentials: true,
      }).then((data) => {
          count = parseInt(data.count);
      });
  };

Calling the increment function, sends an object {count: 1} to the /api/tutorial/1 endpoint. In this case this endpoint returns an object with the same count value that was sent to it.

  let Hello = {
      view: () => {
          return m('main', [
              m('h1', { class: 'title' }, 'My first app'),
              m('button', { onclick: increment }, count + ' clicks'),
          ]);
      },
  };

Lifecycle Methods

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Components and virtual DOM nodes can have lifecycle methods, also known as hooks, which are called at various points during the lifetime of a DOM element.

Components can have the same lifecycle methods as virtual DOM nodes. Note that vnode is passed as an argument to each lifecycle method, as well as to view (with the previous vnode passed additionally to onbeforeupdate): All lifecyle methods receive the vnode as their first arguments, and have their this keyword bound to vnode.state. Lifecycle methods are only called as a side effect of a m.render() call. They are not called if the DOM is modified outside of Mithril.

Components are a mechanism to encapsulate parts of a view to make code easier to organize and/or reuse.
Any JavaScript object that has a view method is a Mithril component. Components can be consumed via the m() utility:

A component can have following lifecycle methods:

oninit
oncreate
onbeforeupdate
onupdate
onbeforeremove
onremove

  let ComponentWithHooks = {
      oninit: (vnode) => {
          console.log("initialized")
      },
      oncreate: (vnode) => {
          console.log("DOM created")
      },
      onbeforeupdate: (newVnode, oldVnode) => {
          return true
      },
      onupdate: (vnode) => {
          console.log("DOM updated")
      },
      onbeforeremove: (vnode) => {
          console.log("exit animation can start")
          return new Promise((resolve) => {
              // call after animation completes
              resolve()
          })
      },
      onremove: (vnode) => {
          console.log("removing DOM element")
      },
      view: (vnode) => {
          return "hello"
      }
  }

Like other types of virtual DOM nodes, components may have additional lifecycle methods (custom methods) defined when consumed as vnode types.

  const initialize = (vnode) => {
      console.log("initialized as vnode")
  }

  m(ComponentWithHooks, {oninit: initialize})

The DOM Element Lifecycle

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A DOM element is typically created and appended to the document. It may then have attributes or child nodes updated when a UI event is triggered and data is changed; and the element may alternatively be removed from the document. After an element is removed, it may be temporarily retained in a memory pool. The pooled element may be reused in a subsequent update (in a process called DOM recycling). Recycling an element avoids incurring the performance cost of recreating a copy of an element that existed recently.

oncreate

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The oncreate(vnode) hook is called after a DOM element is created and attached to the document. oncreate is guaranteed to run at the end of the render cycle, so it is safe to read layout values such as vnode.dom.offsetHeight and vnode.dom.getBoundingClientRect() from this method.

Particularities
- This hook does not get called when an element is updated.
- Like in other hooks, the this keyword in the oncreate callback points to vnode.state. DOM elements whose vnodes have an oncreate hook do not get recycled.
Applications
- The oncreate hook is useful for reading layout values that may trigger a repaint, starting animations and for initializing third party libraries that require a reference to the DOM element.

  const HeightReporter = {
      oncreate: (vnode) => {
          console.log("Initialized with height of: ", vnode.dom.offsetHeight)
      },
      view: () => {}
  }

  m(HeightReporter, {data: "Hello"})

ATTENTION: You should not modify model data synchronously from this method. Since oncreate is run at the end of the render cycle, model changes created from this method will not be reflected in the UI until the next render cycle.

onupdate

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The onupdate(vnode) hook is called after a DOM element is updated, while attached to the document. onupdate is guaranteed to run at the end of the render cycle, so it is safe to read layout values such as vnode.dom.offsetHeight and vnode.dom.getBoundingClientRect() from this method.

Particularities
- This hook is only called if the element existed in the previous render cycle. It is not called when an element is created or when it is recycled.
- DOM elements whose vnodes have an onupdate hook do not get recycled.
Applications
- The onupdate hook is useful for reading layout values that may trigger a repaint, and for dynamically updating UI-affecting state in third party libraries after model data has been changed.

  const RedrawReporter = () => {
      let count = 0
      return {
          onupdate: () => {
              console.log("Redraws so far: ", ++count)
          },
          view: () => {}
      }
  }

  m(RedrawReporter, {data: "Hello"})

onbeforeremove

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The onbeforeremove(vnode) hook is called before a DOM element is detached from the document. If a Promise is returned, Mithril only detaches the DOM element after the promise completes.

Particularities
- This hook is only called on the DOM element that loses its parentNode, but it does not get called in its child elements.
- Like in other hooks, the this keyword in the onbeforeremove callback points to vnode.state. DOM elements whose vnodes have an onbeforeremove hook do not get recycled.

  const Fader = {
      onbeforeremove: (vnode) => {
          vnode.dom.classList.add("fade-out")
          return new Promise((resolve) => {
              setTimeout(resolve, 1000)
          })
      },
      view: () => {
          return m("div", "Bye")
      },
  }

onremove

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The onremove(vnode) hook is called before a DOM element is removed from the document. If a onbeforeremove hook is also defined, the onremove hook runs after the promise returned from onbeforeremove is completed.

Particularities
- This hook is called on any element that is removed from the document, regardless of whether it was directly detached from its parent or whether it is a child of another element that was detached.
- Like in other hooks, the this keyword in the onremove callback points to vnode.state. DOM elements whose vnodes have an onremove hook do not get recycled.
Applications
- The onremove hook is useful for running clean up tasks.

  const Timer = () => {
      const timeout = setTimeout(() => {
          console.log("timed out")
      }, 1000)

      return {
          onremove: () => {
              clearTimeout(timeout)
          },
          view: () => {}
      }
  }

onbeforeupdate

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ATTENTION: onbeforeupdate hook should only be used as a last resort.

The onbeforeupdate(vnode, old) hook is called before a vnode is diffed in a update.If this function is defined and returns false, Mithril prevents a diff from happening to the vnode, and consequently to the vnode's children.

Particularities
- This hook by itself does not prevent a virtual DOM subtree from being generated unless the subtree is encapsulated within a component.
- Like in other hooks, the this keyword in the onbeforeupdate callback points to vnode.state.
Applications
- This hook is useful to reduce lag in updates in cases where there is a overly large DOM tree.

Passing Data To Component

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Data can be passed to component instances by passing an attrs object as the second parameter in the hyperscript function:

  m(Example, {name: "Floyd"})

This data can be accessed in the component's view or lifecycle methods via the vnode.attrs:

  let Example = {
      view: (vnode) => {
          return m("div", "Hello, " + vnode.attrs.name)
      }
  }

State

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Like all virtual DOM nodes, component vnodes can have state. Component state is useful for supporting object-oriented architectures, for encapsulation and for separation of concerns.

IMPORTANT
- Note that unlike many other frameworks, mutating component state does not trigger redraws or DOM updates. Instead, redraws are performed when event handlers fire, when HTTP requests made by m.request complete or when the browser navigates to different routes.
- Mithril's component state mechanisms simply exist as a convenience for applications.
- If a state change occurs that is not as a result of any of the above conditions (e.g. after a setTimeout), then you can use m.redraw() to trigger a redraw manually.

Closure Component State

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Closure component, which is simply a wrapper function which returns a POJO (Plain Old JavaScript Object) component instance, which in turn carries its own, closed-over scope. With a closure component, state can simply be maintained by variables that are declared within the outer function:

  const ComponentWithState = (initialVnode) => {
      // Component state variable, unique to each instance
      let count = 0

      // POJO component instance: any object with a
      // view function which returns a vnode
      return {
          oninit: (vnode) => {
              console.log("init a closure component")
          },
          view: (vnode) => {
              return m("div",
                  m("p", "Count: " + count),
                  m("button", {
                      onclick: () => {
                          count += 1
                      }
                  }, "Increment count")
              )
          }
      }
  }

Any functions declared within the closure also have access to its state variables.

  const ComponentWithState = (initialVnode) => {
      let count = 0

      const increment = () => {
          count += 1
      }

      const decrement = () => {
          count -= 1
      }

      return {
          view: (vnode) => {
              return m("div",
                  m("p", "Count: " + count),
                  m("button", {
                      onclick: increment
                  }, "Increment"),
                  m("button", {
                      onclick: decrement
                  }, "Decrement")
              )
          }
      }
  }

Closure components are consumed in the same way as POJOs.

  m(ComponentWithState, { passedData: ... })

A big advantage of closure components is that we don't need to worry about binding this when attaching event handler callbacks. In fact this is never used at all and we never have to think about this context ambiguities.

POJO Component State

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It is generally recommended that you use closures for managing component state. If, however, you have reason to manage state in a POJO, the state of a component can be accessed in three ways: as a blueprint at initialization, via vnode.state and via the this keyword in component methods.

At Initialization

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For POJO components, the component object is the prototype of each component instance, so any property defined on the component object will be accessible as a property of vnode.state. This allows simple "blueprint" state initialization.

In the example below, data becomes a property of the ComponentWithInitialState component's vnode.state object.

  const ComponentWithInitialState = {
      data: "Initial content",
      view: function(vnode) {
          return m("div", vnode.state.data)
      }
  }

  m(ComponentWithInitialState)
  // <div>Initial content</div>

Via vnode.state

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As you can see, state can also be accessed via the vnode.state property, which is available to all lifecycle methods as well as the view method of a component.

  const ComponentWithDynamicState = {
      oninit: (vnode) => {
          vnode.state.data = vnode.attrs.text
      },
      view: (vnode) => {
          return m("div", vnode.state.data)
      }
  }

  m(ComponentWithDynamicState, {text: "Hello"})
  // <div>Hello</div>

Via The This Keyword

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State can also be accessed via the this keyword, which is available to all lifecycle methods as well as the view method of a component.

  const ComponentUsingThis = {
      oninit: (vnode) => {
          this.data = vnode.attrs.text
      },
      view: (vnode) => {
          return m("div", this.data)
      }
  }

  m(ComponentUsingThis, {text: "Hello"})
  // <div>Hello</div>

Classes

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Components can also be written using classes:

  class ClassComponent {
      constructor(vnode) {
          this.kind = "class component"
      }
      view() {
          return m("div", `Hello from a ${this.kind}`)
      }
      oncreate() {
          console.log(`A ${this.kind} was created`)
      }
  }

Class components must define a view() method, detected via .prototype.view, to get the tree to render. They can be consumed in the same way regular components can.

  // EXAMPLE: via m.render
  m.render(document.body, m(ClassComponent))

  // EXAMPLE: via m.mount
  m.mount(document.body, ClassComponent)

  // EXAMPLE: via m.route
  m.route(document.body, "/", {
      "/": ClassComponent
  })

  // EXAMPLE: component composition
  class AnotherClassComponent {
      view() {
          return m("main", [
              m(ClassComponent)
          ])
      }
  }

Class Component State

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With classes, state can be managed by class instance properties and methods, and accessed via this:

  class ComponentWithState {
      constructor(vnode) {
          this.count = 0
      }
      increment() {
          this.count += 1
      }
      decrement() {
          this.count -= 1
      }
      view() {
          return m("div",
              m("p", "Count: " + count),
              m("button", {
                  onclick: () => {this.increment()}
              }, "Increment"),
              m("button", {
                  onclick: () => {this.decrement()}
              }, "Decrement")
          )
      }
  }

Note that we must use arrow functions for the event handler callbacks so the this context can be referenced correctly.

  class Person {
      constructor(firstName, lastName) {
          this.firstName = firstName;
          this.lastName = lastName;
          this.fullName = () => `${this.firstName} ${this.lastName}`;
      }
  }

  let Component = {
      view: function () {
          console.log('--------------This Before--------------');
          console.log(JSON.stringify(this, undefined, 3));
          this.person = new Person('Roger', 'Takeshita');
          console.log('--------------This  after--------------');
          console.log(JSON.stringify(this, undefined, 3));
          const name = m('span', this.person.fullName());
          return m('h1', ['Hello ', name, '!']);
      },
  };

  const outputEl = document.getElementById('output');
  m.mount(outputEl, Component);

Name		Name	Last commit message	Last commit date
Latest commit History 17 Commits
001_Simple_HTML		001_Simple_HTML
002_Node_Mithril		002_Node_Mithril
003_Cookie_Calculator		003_Cookie_Calculator
004_Mithril_0-60		004_Mithril_0-60
.gitignore		.gitignore
README.md		README.md

Roger-Takeshita/MithrilJS

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TABLE OF CONTENTS

MITHRIL.JS

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Installation

Virtual DOM

What a Virtual DOM Looks Like?

Inline Styling

Render

Mount a New Element

Element By Id

Add a Single Element With a CSS Class

Add Multiple Elements With a CSS Class

Adding To an Existing Element

Mount vs Render

Auto-Redraw System

Disable Auto-Redraw

After Event Handlers

After m.request

DISABLE AUTO-REDRAW AFTER M.REQUEST

After Route Changes

When Mithril Does Dot Redraw

view() - Component

m.route() - Route

m.route.link()

m.request() - XHR (API Calls)

Lifecycle Methods

The DOM Element Lifecycle

oncreate

onupdate

onbeforeremove

onremove

onbeforeupdate

Passing Data To Component

State

Closure Component State

POJO Component State

At Initialization

Via vnode.state

Via The This Keyword

Classes

Class Component State

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