impression

Check DOM component in view

Also can use it handle something like transition effect in view

You can use it log some dom component impression

Method

• getCount()

Get current impression dom object quantity

• addImpression([dom object])

Add dom object or nodelist which want to check impression

	type	required	description	example
dom object	DOM Object or Node List	required	dom object which want to check impression	document.querySelector('#traget'), document.querySelectorAll('.traget li')

• removeImpression([key])

Remove impression dom object, but you must know which dom object match impression key

	type	required	description	example
key	String	required	impression obj key and it is impression_ + number	impression_0, impression_3

• calcImpression([doSomething], [width], [height])

Calculate Dom object in view & get callback

You can use it do something like ga or log or transition

	type	required	description	example
doSomething	function([dom]) {}	option	callback function	function(dom) {console.log(dom);}
width	Number	option	view width want to calculate, default is browser view width	960
height	Number	option	view height want to calculate, default is browser view height	480

	type	required	description
dom	DOM Object	option	impression dom object

• impressionObj

Show object which added to impression dom object

Usage

var IMP = new impression();

IMP.addImpression(document.querySelectorAll('li')[100]);

window.addEventListener('scroll', debounce(function() {
    IMP.calcImpression(function (dom) {
        console.log(dom);
    });
}, 300));