What is the best method for saving a canvas image from GUI to back-end using an AJAX call that accepts content type "image/jpeg" and avoids the error "jquery.js: 8453 Uncaught TypeError: Illegal invocation?"
HTML
<canvas id="myImage"></canvas> // Canvas loaded with image
Creating a Canvas Image using HTML
<canvas id="myImage"></canvas> // HTML code for loading canvas with an image
Using JavaScript to Save the Image
var can = $("#myImage");
var blob = this.dataURItoBlob(can.toDataURL("image/jpeg"));
var postPromise = $.ajax({
type: "PUT",
url: 'URL_to_save_the_image',//API URL for saving the image
data: blob, // The data is sent without being transformed into a query string
processData: false, // Important step to avoid "jquery.js:8453 Uncaught TypeError: Illegal invocation" error caused by transformation to query string
contentType: 'image/jpeg'
});
postPromise.done(function(data, textStatus, jqXHR) {
//Code for handling success goes here
});
postPromise.fail(function(jqXHR, textStatus, errorThrown) {
//Code for handling failure goes here
});
function dataURItoBlob(dataURI) {
// Function to convert base64/URLEncoded data component to raw binary data in a string format
var byteString;
if (dataURI.split(',')[0].indexOf('base64') >= 0)
byteString = atob(dataURI.split(',')[1]);
else
byteString = unescape(dataURI.split(',')[1]);
// Separating the mime component from the data URI
var mimeString = dataURI.split(',')[0].split(':')[1].split(';')[0];
// Writing the bytes of the string to a typed array
var ia = new Uint8Array(byteString.length);
for (var i = 0; i < byteString.length; i++) {
ia[i] = byteString.charCodeAt(i);
}
return new Blob([ia], {
type: mimeString
});
}
I am currently working on a TypeScript project with a specific configuration setup. The partial contents of my tsconfig.json file are as follows: { "compilerOptions": { "module": "commonjs", "baseUrl": &quo ...
This is the main page with a date picker that links to index.php, where the data table is located. Everything works fine when I select a date, but if I make any changes on the index.php page or try to access it directly, I encounter this error: Notice: ...
Working in an MVC environment, I find myself calling a Controller method from my View. The Controller method conducts some validation checks and then returns to the same view with a faulty modelstate. However, despite expecting all of my validation fields ...
Currently, I am using periodic Ajax calls from the view to fetch new data every 2 seconds. The controller is responsible for monitoring hardware/sensor signals. Is it possible to implement SignalR instead of Ajax? I have come across examples where change ...
Could someone help me find the bug in my code related to resizing SVG symbols with CSS? I am able to resize one <symbol> from an external SVG file, but not another <symbol> from the same file. In my CSS, I am trying to change the width and hei ...
I am currently facing an issue with closing a ModalPopup after a code sequence is executed. The situation at hand involves coding a filebrowser for the company and everything seems to be working fine except for the downloading of files. I have implemented ...
I am working on a task management app that allows users to create a To-Do list and remove specific items from the list. Currently, I am facing an issue with using 'localStorage' to save the list when the page is refreshed. The problem arises when ...
In my Next.js project, I am using the useState hook to render different components based on the button a user clicks. The main page, called account.js in the application, contains the following code: // Importing react and getting components import React f ...
Currently, I am working on some ajax processing for a click event. Everything is functioning correctly so far, but now I have encountered an issue when trying to add a class in the success function. I am using $(this).addClass("cover");, however, nothing ...
Looking to insert some Python code into an HTML document using the code tag. Here is an example: <code> for iris, species in zip(irises, classification): if species == 0: print(f'Flower {iris} is Iris-setosa') </ ...
Having trouble changing the background color for my drop down menu. I tried to change the color for the sub div but it's not working. Can anyone help me fix this issue? Here is the code snippet: http://jsfiddle.net/3VBQ6/4/ #nav li:hover ul.sub li { ...
I have developed an Angular 2 application that utilizes Node.js server APIs. After building the app using nd b, the files were generated in the dist folder. Where should I specify the production URL for the build so that all CSS and JS files load properly? ...
My code runs smoothly in browsers, but faces issues with PhoneGap compilation. The SCROLL FROM LEFT/SCROLL FROM RIGHT functionality doesn't seem to work as expected. Despite this, the LEFT/RIGHT menus can be accessed by clicking the button at the top ...
One way I've been attempting to send information to a directive is through the following setup: <ui-message data="{{app}}"></ui-message> In my controller, this is how I define it: app.controller("testCtrl", function($scope) { $scope.a ...
I'm attempting to access the Binance API in order to obtain the current price of Litecoin (LTC) in Bitcoin (BTC). For this purpose, I have tested the following URL on my web browser: "https://api.binance.com/api/v1/ticker/price?symbol=LTCBTC". Now, I ...
I am currently facing an issue with my ajax call that updates a kendo multiselect's data source based on another dropdown selection. The multiselect also has a read action that filters the data. AJAX Call function getPsychiatrists() { return $.aj ...
I'm encountering issues with jQuery touch events on iOS devices. Here is my current script: $(document).ready(function(){ var iX = 0,iY = 0,fX = 0,fY = 0; document.addEventListener('touchstart', function(e) { ...
I have been developing a ToDo App using MongoDB, EJS, and Node JS. My current challenge involves implementing a theme changer button that successfully changes colors when clicked. However, whenever a new item is added to the database, the page reloads caus ...
I am uncertain if achieving this purely with CSS is possible, but it would be ideal. I currently have an image: <img src="#" class="article-thumb"> CSS: .article-thumb { height: 55%; } Is there a way to set the width equal to the height? My g ...
I have encountered an issue in my Django app where a datatable used in the template disappears if there is missing data in any column or row. The problem occurs when trying to download the data in CSV, Excel, PDF, or copy format. Here is the HTML code snip ...