JUMON.js - JUst html element MONitor

JUMON.js is simple DOM access library. This enables easily and readable access to DOM element from your code by binding DOM elements' attribute to Jumon object.

How to use

1. Add 'jumon-*' attribute to HTML elements

<form>
  <input value="50" jumon-bind="width" jumon-type="Number">
  <input value="100" jumon-bind="height" jumon-type="Number">
</form>

2. import Jumon class and create instance

import { Jumon } from './jumon.js';
parameter = new Jumon();

3. access element's value via Jumon instance

// read text box's values
console.log(parameter.width);
console.log(parameter.height);

// update text box's value
parameter.width = 100;
parameter.height = 200;

jumon-* attribute references

jumon-bind="propertyName"

Bind the element's value to Jumon instance's .propertyName property.

Example:

<select jumon-bind="count">
  <option value="1" selected>1</option>
  <option value="2">2</option>
  <option value="3">3</option>
</select>

parameter = new Jumon();
console.log(parameter.count); // output: "1"

jumon-type="Number"

Enable auto type conversion to Number. If value is not a number, conversion result is "NaN".

Example:

<select jumon-bind="count" jumon-type="Number">
  <option value="1" selected>1</option>
  <option value="2">2</option>
  <option value="3">3</option>
</select>

parameter = new Jumon();
console.log(parameter.count); // output: 1

jumon-bind-to="selector[attribute]"

Bind the element's value to another element's attribue.

Example:

<input class="ratio" value="100" jumon-bind-to="#frame[height]">
<iframe src="https://example.com/" height="0"></iframe>

jumon-bind-to="converter:selector[attribute]"

Bind the element's value to another element's attribue. the value is given to converter function, and then set its return value to the selected element's attribute.

Example:

<input class="ratio" value="100" jumon-bind-to="calcSize:#frame[height]">
<iframe src="https://example.com/" height="0"></iframe>

parameter = new Jumon();
parameter.calcSize(val => val * 2); // set the iframe's height to twice the value

jumon-bind-renderer="renderMethod:propertyName"

Append the HTML which render method returns as the element's child.

Example:

<div jumon-bind-renderer="renderer:items">
</div>

parameter = new Jumon();
parameter.renderer = (param, index) => {
  return `<div>${index}: ${param.title}</div>`;
}
parameter.items = [
  {title: "foo"},
  {title: "bar"},
];

jumon-listen="click:listenerMethod"

Add EventListner to the element.

Example:

<button jumon-listen="click:update">update</button>

parameter = new Jumon();
parameter.update = (event) {
  // When the button is clicked, this method is invoked.
};

Copyright

2022, Hiromichi Matsushima (hylom) [email protected].

License

MIT License.