forked from projects/fipamo
115 lines
4.1 KiB
JavaScript
115 lines
4.1 KiB
JavaScript
export const REQUEST_TYPE_POST = "POST";
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export const REQUEST_TYPE_GET = "GET";
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export const REQUEST_TYPE_PUT = "PUT";
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export const REQUEST_TYPE_DELETE = "DELETE";
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export const CONTENT_TYPE_JSON = 'json';
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export const CONTENT_TYPE_FORM = 'x-www-form-urlencoded';
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import EventEmitter from '../events/EventEmitter.jsx';
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import * as DataEvent from '../events/DataEvent.jsx';
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class DataUtils extends EventEmitter {
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//--------------------------
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// constructor
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//--------------------------
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constructor() {
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super();
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var self = this;
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}
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//--------------------------
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// methods
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//--------------------------
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request(requestURL, eventType, requestType = REQUEST_TYPE_GET, contentType = CONTENT_TYPE_JSON, requestData = null) {
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var self = this;
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return new Promise(function(resolve, reject) {
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var request = new XMLHttpRequest();
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request.upload.onprogress = self.handleLoadProgress;
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request.open(requestType, requestURL, true);
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request.onload = function(e) {
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if (request.status == 200) {
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resolve({
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request,
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eventType
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});
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} else {
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reject({
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request,
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eventType
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});
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}
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;
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};
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if (requestType == REQUEST_TYPE_PUT || requestType == REQUEST_TYPE_POST) {
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switch (contentType) {
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case CONTENT_TYPE_JSON:
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request.setRequestHeader("Content-type", "application/" + contentType);
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request.send(JSON.stringify(requestData));
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break;
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case CONTENT_TYPE_FORM:
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request.send(requestData);
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break;
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}
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} else {
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request.send();
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}
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})
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}
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imgLoad(url) {
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'use strict';
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// Create new promise with the Promise() constructor;
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// This has as its argument a function with two parameters, resolve and reject
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return new Promise(function(resolve, reject) {
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// Standard XHR to load an image
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var request = new XMLHttpRequest();
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request.open('GET', url);
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request.responseType = 'blob';
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// When the request loads, check whether it was successful
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request.onload = function() {
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if (request.status === 200) {
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// If successful, resolve the promise by passing back the request response
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resolve(request.response);
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} else {
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// If it fails, reject the promise with a error message
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reject(new Error('Image didn\'t load successfully; error code:' + request.statusText));
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}
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};
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request.onerror = function() {
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// Also deal with the case when the entire request fails to begin with
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// This is probably a network error, so reject the promise with an appropriate message
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reject(new Error('There was a network error.'));
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};
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// Send the request
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request.send();
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});
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}
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loadImage(src) {
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'use strict';
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let self = this;
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return new Promise(function(resolve, reject) {
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// Get a reference to the body element, and create a new image object
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var body = document.querySelector('body'),
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myImage = new Image();
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myImage.crossOrigin = ""; // or "anonymous"
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// Call the function with the URL we want to load, but then chain the
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// promise then() method on to the end of it. This contains two callbacks
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self.imgLoad(src).then(function(response) {
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// The first runs when the promise resolves, with the request.reponse specified within the resolve() method.
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var imageURL = window.URL.createObjectURL(response);
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resolve(imageURL);
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//$('background-content').setStyle('background-image', 'url('+imageURL+')') //myImage.src = imageURL;
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//console.log(imageURL);
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//body.appendChild(myImage);
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// The second runs when the promise is rejected, and logs the Error specified with the reject() method.
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}, function(Error) {
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reject(Error)
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});
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});
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}
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//--------------------------
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// event handlers
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//--------------------------
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handleLoadProgress(e) {
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var percentComplete = Math.ceil((e.loaded / e.total) * 100);
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//console.log(percentComplete);
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}
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}
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export default DataUtils;
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