attr-chooser/index.js

select among a list of dom elements with the same attribute

var classList = require('class-list');

module.exports = function (className, cb) {
    if (typeof className === 'string') {
        className = (function (str) {
            return function () { return str };
        })(className);
    }
    if (typeof className !== 'function') {
        throw new Error('className must be a function, string, or object');
    }
    
    var prev, elements = [];
    return function (elem) {
        elements.push(elem);
        
        var cname = className(elem);
        elem.addEventListener('click', function (ev) {
            ev.preventDefault();
            if (cname && prev) classList(prev).remove(cname);
            if (cname) classList(elem).add(cname);
            prev = elem;
            if (cb) cb(elem, ev);
        });
    };
};