You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
94 lines
2.9 KiB
JavaScript
94 lines
2.9 KiB
JavaScript
export default class DataUtils {
|
|
//--------------------------
|
|
// constructor
|
|
//--------------------------
|
|
constructor() {}
|
|
//--------------------------
|
|
// methods
|
|
//--------------------------
|
|
|
|
imgLoad(url) {
|
|
'use strict';
|
|
// Create new promise with the Promise() constructor;
|
|
// This has as its argument a function with two parameters, resolve and reject
|
|
return new Promise(function (resolve, reject) {
|
|
// Standard XHR to load an image
|
|
var request = new XMLHttpRequest();
|
|
request.open('GET', url);
|
|
request.responseType = 'blob';
|
|
// When the request loads, check whether it was successful
|
|
request.onload = function () {
|
|
if (request.status === 200) {
|
|
// If successful, resolve the promise by passing back the request response
|
|
resolve(request.response);
|
|
} else {
|
|
// If it fails, reject the promise with a error message
|
|
reject(
|
|
new Error(
|
|
"Image didn't load successfully; error code:" +
|
|
request.statusText
|
|
)
|
|
);
|
|
}
|
|
};
|
|
request.onerror = function () {
|
|
// Also deal with the case when the entire request fails to begin with
|
|
// This is probably a network error, so reject the promise with an appropriate message
|
|
reject(new Error('There was a network error.'));
|
|
};
|
|
// Send the request
|
|
request.send();
|
|
});
|
|
}
|
|
loadImage(src) {
|
|
'use strict';
|
|
let self = this;
|
|
return new Promise(function (resolve, reject) {
|
|
// Get a reference to the body element, and create a new image object
|
|
var myImage = new Image();
|
|
myImage.crossOrigin = ''; // or "anonymous"
|
|
// Call the function with the URL we want to load, but then chain the
|
|
// promise then() method on to the end of it. This contains two callbacks
|
|
self.imgLoad(src).then(
|
|
function (response) {
|
|
// The first runs when the promise resolves, with the request.reponse specified within the resolve() method.
|
|
var imageURL = window.URL.createObjectURL(response);
|
|
resolve(imageURL);
|
|
//$('background-content').setStyle('background-image', 'url('+imageURL+')') //myImage.src = imageURL;
|
|
//console.log(imageURL);
|
|
//body.appendChild(myImage);
|
|
// The second runs when the promise is rejected, and logs the Error specified with the reject() method.
|
|
},
|
|
function (Error) {
|
|
reject(Error);
|
|
}
|
|
);
|
|
});
|
|
}
|
|
|
|
/**
|
|
* Create a function to convert the serialize and convert the form data to JSON
|
|
* @param : $('#form_example');
|
|
* @return a JSON Stringify
|
|
*/
|
|
formDataToJSON(form) {
|
|
let object = {};
|
|
let formData = new FormData(form);
|
|
formData.forEach((value, key) => {
|
|
if (!object.hasOwnProperty(key)) {
|
|
object[key] = value;
|
|
return;
|
|
}
|
|
if (!Array.isArray(object[key])) {
|
|
object[key] = [object[key]];
|
|
}
|
|
object[key].push(value);
|
|
});
|
|
//let json = JSON.stringify(object);
|
|
return object;
|
|
}
|
|
//--------------------------
|
|
// event handlers
|
|
//--------------------------
|
|
}
|