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index.js
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index.js
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/**********************
* Module Dependencies.
*********************/
var debug = require('debug')('glint-widget');
var isBrowser = require('is-browser');
var defaults = require('defaults');
var inherits = require('inherits');
var EventEmitter = require('events').EventEmitter;
var domify;
/**
* Expose Widget element.
*/
exports = module.exports = Widget;
inherits(Widget, EventEmitter);
/**
* Initialize a new `Widget` element.
*/
function Widget(rendr) {
if (!(this instanceof Widget)) return new Widget(rendr);
if (rendr && typeof rendr === 'function') this.render(rendr);
this.init();
}
/****************
* API Functions.
***************/
Widget.prototype.api = Widget.api = 'widget';
['template', 'data', 'render', 'key', 'id', 'selector', 'prepend', 'append', 'el', 'place'].forEach(function(attribute) {
Widget.prototype[attribute] = function(value) {
this.emit(attribute, value);
if (typeof value !== 'undefined') {
if (attribute == 'place' && this['_' + attribute] == 'both') return this;
this['_' + attribute] = value;
return this;
}
return this['_' + attribute];
};
});
Widget.prototype.load = function(context, done) {
if (typeof context === 'function') done = context, context = undefined;
done = done || noop;
var self = this, id = this._id;
this.emit('pre-load', this);
// make sure it loads either on the server or in the browser, but not both.
if (self.skip()) return done();
// 1. retrieve the data via adapter
this.ensureData();
this._data(function(err, result) {
debug('load', err, result);
if (err) return done(err);
if (context) result = defaults(result, context);
// 2. render with the given data
self.html = result ? self._render(result) : '';
self.insert(self.html);
done(null, self.html, result);
self.emit('post-load', self);
});
return this;
};
Widget.prototype.insert = function(html) {
var el = this.el();
if (!isBrowser || !el) return false;
domify = domify || require('domify');
if (this._prepend) {
// prepend
html = domify(html);
el.insertBefore(html, el.childNodes[0]);
} else if (this._append) {
// append
html = domify(html);
el.appendChild(html);
} else {
// insert (replace el's html content)
this.el().innerHTML = html;
}
return true;
};
/****************
* Base Functions.
***************/
Widget.prototype.init = function() {
var self = this;
this.on('selector', function(selector) {
// this or self, that's the question
if (isBrowser && selector) this.el(document.querySelector(selector));
});
};
Widget.prototype.ensureData = function() {
if (!this._data) this._data = pass;
};
Widget.prototype.skip = function skip() {
var p1 = this._place || process.env.GLINT_PLACE || 'server';
// general rules
if (p1 == 'force:both') return false;
if (!isBrowser) {
// server rules
if (p1 == 'force:server') return false;
if (p1 == 'force:browser') return true;
if (p1 == 'browser') return true;
} else {
// browser rules
if (p1 == 'force:server') return true;
if (p1 == 'force:browser') return false;
if (p1 == 'server') return true;
}
// default don't skip
return false;
};
function noop() {
}
function pass(fn) {
fn(null, {});
}