common-binders 

The module includes common binder creators or HTML binding, attribute binding etc. which can be used with defi.js.

- attr used to bind attributes.
- className used to bind element class name.
- dataset used to bind dataset properties.
- display switches element visibility.
- existence switches element existence at DOM tree.
- html used to bind innerHTML.
- prop used to bind element properties.
- style used to bind element style properties.
- text used to bind textContent.

Usage

In browser environment these functions live at `window.commonBinders object.

`html

`

`js
const { bindNode } = defi;
const {
attr, className, dataset, display,
existence, html, prop, style, text
} = commonBinders;
const obj = {};

bindNode(obj, 'key', node, html());

// if you don't want to create variables
bindNode(obj, 'key', node, commonBinders.prop('foo'));
`

The bundle can be downloaded at gh-pages branch

-------------

`
npm i common-binders
`

`js
// import all binders
const {
attr, className, dataset, display,
existence, html, prop, style, text
} = require('common-binders');

// import only needed binders
const attr = require('common-binders/attr');
const className = require('common-binders/classname');
const dataset = require('common-binders/dataset');

// ...
bindNode(obj, 'key', node, attr('foo'));
`

attr(attribute, [mappingFn])


Returns a binder which changes an attribute of DOM node depending on an object property value. The value can be transformed using mappingFn argument.

`js
bindNode(obj, 'image', 'img.my-image', attr('src'));
obj.image = 'http://example.com/cats.jpg';
`
`js
bindNode(obj, 'myKey', '.my-node', attr('foo', value => Hello, ${value}));
obj.myKey = 'World'; // the foo attr now has value "Hello, World"
`

className(className, [bool=true])

Returns a binder which switches over DOM node class name depending on an object property value. If property value equals true non-strictly, a class name is added, otherwise - it's removed. The logic can be changed by passing false as the second argument and in this way, a class name will be added when a property value equals false non-strictly and vice versa.

`js
bindNode(obj, 'myKey', '.my-element', className('foo'));
obj.myKey = true; // adds the 'foo' class
obj.myKey = false; // removes the 'foo' class
`
`js
bindNode(obj, 'myKey', '.my-element', className('foo', false));
obj.myKey = false; // adds the 'foo' class
obj.myKey = true; // removes the 'foo' class
`

dataset(property, [mappingFn])

Returns a binder which changes given dataset property of bound DOM node depending on an object property value. The property value can be transformed using mappingFn argument.

`js
bindNode(obj, 'myKey', '.my-element', dataset('myProp'));
obj.myKey = 'foo';
`
`js
bindNode(obj, 'myKey', '.my-element', dataset('myProp', value => Hello, ${value}));
obj.myKey = 'foo'; // the attr data-my-prop now has value "Hello, foo"
`

display([bool=true])

Returns a binder which controls a visibility of DOM node (using style.display) depending on an object property value. If the bool argument equals true, a node is hidden when a property value is falsy; if it equals false, it is hidden when a property value is truly.


`js
bindNode(obj, 'myKey', '.my-element', display(true));
`

`js
bindNode(obj, 'myKey', '.my-element', display(false));
`

existence([bool=true])

Returns a binder which controls an existence of DOM node at DOM tree depending on an object property value. The binder works the same way as display, but instead of visibility change the existence at page DOM is changed. The binder is useful for:

- Big appications: show one or another page depending on route state;
- For infinite scrolling;
- For other cases where you need to hide an element but its existence at DOM tree isn't necessary.

If the bool argument equals true, a node is removed when a property value is falsy; if it equals false, it is removed when a property value is truly.

`js
bindNode(obj, 'myKey', '.my-element', existence(true));
`
`js
bindNode(obj, 'myKey', '.my-element', existence(false));
`




html([mappingFn])

Returns a binder which changes innerHTML of a bound DOM node depending on an object property value. The property value can be transformed using mappingFn argument.

`js
bindNode(obj, 'myKey', '.my-element', html());

// sets innerHTML="

"
obj.myKey = '

foo

';
`
`js
bindNode(obj, 'myKey', '.my-element', html(value => Hello, ${value}));

// sets innerHTML="Hello,

foo

"
obj.myKey = '

foo

';
`

prop(property, [mappingFn])

Returns a binder which changes given property of DOM node depending on an object property value. The property value can be transformed using mappingFn argument.

`js
bindNode(obj, 'disabled', '.my-button', prop('disabled'));
// sets disabled = true property for the node
obj.disabled = true;
// sets disabled = false property for the node
obj.disabled = false;
`
`js
bindNode(obj, 'myProp', '.my-node', prop('foo', value => Hello, ${value}));

// foo property of the element now has value "Hello, World"
obj.myProp = 'World';
`

style(property, [mappingFn])

Returns a binder which changes given style property of bound DOM node depending on an object property value. The property value can be transformed using mappingFn argument.

`js
bindNode(obj, 'myKey', '.my-progres', style('backgroundColor'));

obj.myKey = 'red'; // background-color of .my-progress is red now
`
`js
bindNode(obj, 'myKey', '.my-element', style('backgroundImage', value => url("${value}")));

obj.myKey = 'cats.jpg'; // backgroundImage now equals to "url("cats.jpg")"
`




text([mappingFn])

Returns a binder which changes textContent of bound DOM node depending on an object property value. The property value can be transformed using mappingFn argument.

`js
bindNode(obj, 'myKey', '.my-element', text());

obj.myKey = 'foo'; // sets textContent as "foo"
`
`js
bindNode(obj, 'myKey', '.my-element', text(value => Hello, ${value}));

obj.myKey = 'foo'; // sets textContent as "Hello, foo"
``