145 lines
3.2 KiB
JavaScript
145 lines
3.2 KiB
JavaScript
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var $ = require('jquery');
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var _ = require('underscore');
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var CoreView = require('backbone/core-view');
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var checkAndBuildOpts = require('builder/helpers/required-opts');
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var TEMPLATES = {
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// Using <%= %> instead of <%- %> because if not / characters (for example) will be escaped
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regular: '<%- protocol %>://<%= mapsApiResource %>/api/v1/map/static/named/<%- tpl %>/<%- width %>/<%- height %>.png<%= authTokens %>',
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cdn: '<%- protocol %>://<%- cdn %>/<%- username %>/api/v1/map/static/named/<%- tpl %>/<%- width %>/<%- height %>.png<%= authTokens %>'
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};
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var REQUIRED_OPTS = [
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'config',
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'visId',
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'mapsApiResource',
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'username'
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];
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/**
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* MapCard previews
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*
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*/
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module.exports = CoreView.extend({
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options: {
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width: 300,
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height: 170,
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privacy: 'PUBLIC',
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className: '',
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authTokens: []
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},
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initialize: function (options) {
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checkAndBuildOpts(options, REQUIRED_OPTS, this);
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},
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load: function () {
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this._startLoader();
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this._loadFromVisId();
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return this;
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},
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_generateImageTemplate: function () {
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return 'tpl_' + this._visId.replace(/-/g, '_');
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},
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_loadFromVisId: function () {
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var protocol = this._isHTTPS() ? 'https' : 'http';
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var cdnConfig = this._config.get('cdn_url');
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var template = _.template(cdnConfig ? TEMPLATES['cdn'] : TEMPLATES['regular']);
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var options = {
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protocol: protocol,
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username: this._username,
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mapsApiResource: this._mapsApiResource,
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tpl: this._generateImageTemplate(),
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width: this.options.width,
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height: this.options.height,
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authTokens: this._generateAuthTokensParams()
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};
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if (cdnConfig) {
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options = _.extend(options, {
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cdn: cdnConfig[protocol]
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});
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}
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var url = template(options);
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this._loadImage({}, url);
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},
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_generateAuthTokensParams: function () {
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var authTokens = this.options.authTokens;
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if (authTokens && authTokens.length > 0) {
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return '?' + _.map(authTokens, function (t) { return 'auth_token=' + t; }).join('&');
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} else {
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return '';
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}
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},
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_isHTTPS: function () {
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return location.protocol.indexOf('https') === 0;
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},
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loadURL: function (url) {
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var $img = $('<img class="MapCard-preview" src="' + url + '" />');
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this.$el.append($img);
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if (this.options.className) {
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$img.addClass(this.options.className);
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}
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$img.fadeIn(250);
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},
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showError: function () {
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this._onError();
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},
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_startLoader: function () {
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this.$el.addClass('is-loading');
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},
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_stopLoader: function () {
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this.$el.removeClass('is-loading');
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},
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_onSuccess: function (url) {
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this._stopLoader();
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this.loadURL(url);
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this.trigger('loaded', url);
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},
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_onError: function () {
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this._stopLoader();
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this.$el.addClass('has-error');
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var $error = $('<div class="MapCard-error" />');
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this.$el.append($error);
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$error.fadeIn(250);
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this.trigger('error');
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},
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_loadImage: function (error, url) {
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var self = this;
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var img = new Image();
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img.onerror = function () {
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self._onError(error);
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};
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img.onload = function () {
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self._onSuccess(url);
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};
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try {
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img.src = url;
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} catch (err) {
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this._onError(err);
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}
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}
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});
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