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DataAttributeHandler.js
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/
DataAttributeHandler.js
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(function() {
'use strict';
/**
* Initilizes senna.App, register surfaces and routes from data attributes.
* @constructor
*/
senna.DataAttributeHandler = function(baseElement) {
if (!senna.isElement(baseElement)) {
throw new Error('Base element not specified.');
}
this.setBaseElement(baseElement);
this.initApp_();
};
/**
* Holds app reference.
* @type {senna.App}
*/
senna.DataAttributeHandler.prototype.app = null;
/**
* Holds the base element to search initialization data attributes.
* @type {Element}
* @default null
*/
senna.DataAttributeHandler.prototype.baseElement = null;
/**
* Gets app reference.
* @return {senna.App}
*/
senna.DataAttributeHandler.prototype.getApp = function() {
return this.app;
};
/**
* Gets base element.
* @return {Element}
*/
senna.DataAttributeHandler.prototype.getBaseElement = function() {
return this.baseElement;
};
/**
* Initializes app.
* @protected
*/
senna.DataAttributeHandler.prototype.initApp_ = function() {
var baseElement = this.baseElement;
if (!baseElement.hasAttribute('data-senna')) {
console.log('Senna not initialized from data attribute, try passing <body data-senna>.');
return;
}
console.log('Senna initialized from data attribute.');
this.app = new senna.App();
var basePath = baseElement.getAttribute('data-senna-basepath');
if (!senna.isNull(basePath)) {
this.app.setBasePath(basePath);
console.log('Senna scanned basepath ' + basePath);
}
var linkSelector = baseElement.getAttribute('data-senna-link-selector');
if (!senna.isNull(linkSelector)) {
this.app.setLinkSelector(linkSelector);
console.log('Senna scanned link selector ' + linkSelector);
}
this.scanSurfaces();
this.scanRoutes();
};
/**
* Makes default route in case of not found any.
* @return {Element}
*/
senna.DataAttributeHandler.prototype.makeDefaultRoute_ = function() {
var link = document.createElement('link');
link.href = 'regex:.*';
link.rel = 'senna-route';
link.type = 'senna.HtmlScreen';
return link;
};
/**
* Scans routes from link elements.
*/
senna.DataAttributeHandler.prototype.scanRoutes = function() {
var routes = document.querySelectorAll('link[rel="senna-route"]');
if (routes.length === 0) {
console.log('Senna can\'t find a route element, adding default.');
routes = [this.makeDefaultRoute_()];
}
for (var i = 0; i < routes.length; i++) {
var route = routes[i];
if (route.hasAttribute('senna-parsed')) {
continue;
}
var path = route.getAttribute('href');
var handler = route.getAttribute('type');
if (senna.isDefAndNotNull(path) && senna.isDefAndNotNull(handler)) {
if (path.indexOf('regex:') === 0) {
path = new RegExp(path.substring(6));
}
this.app.addRoutes(new senna.Route(path, senna.getObjectByName(handler)));
route.setAttribute('data-parsed', '');
console.log('Senna scanned route ' + path);
}
}
};
/**
* Scans surfaces with data attribute.
*/
senna.DataAttributeHandler.prototype.scanSurfaces = function() {
var surfaces = this.baseElement.querySelectorAll('[data-senna-surface]');
for (var i = 0; i < surfaces.length; i++) {
var surfaceId = surfaces[i].id;
if (surfaceId) {
if (!this.app.surfaces[surfaceId]) {
this.app.addSurfaces(surfaceId);
console.log('Senna scanned surface ' + surfaceId);
}
} else {
throw new Error('Surface element id not specified.');
}
}
};
/**
* Sets the app.
* @param {senna.App} app
*/
senna.DataAttributeHandler.prototype.setApp = function(app) {
this.app = app;
};
/**
* Sets the base element.
* @param {Element} baseElement
*/
senna.DataAttributeHandler.prototype.setBaseElement = function(baseElement) {
this.baseElement = baseElement;
};
}());