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qimage

v1.3.0

Published

Simple Promise Image Loader based on Q

Downloads

14

Readme

Qimage Build Status

Qimage is a simple Promise Image Loader library based on Q.

Checkout the Annotated Source Code

Installation

on NPM:

npm install qimage

Bower is also supported.

Usage Examples

Qimage takes an URL (string) and returns a Promise of Image.

Qimage(url: String) => Promise[Image]

Qimage.anonymously(url: String) => Promise[Image]

Simple example

Qimage("images/foo.png").then(function (img) {
  document.body.appendChild(img);
}, function (error) {
  document.body.innerHTML = "Unable to load the image";
});

Making Anonymous Cross Origin requests

Qimage.anonymously("https://example.com/image.jpg")
  .then(function (img) {
    // I'm now allowed to use img in a Canvas for instance. (CORS restriction)
    canvasctx.drawImage(img);
  });

Multiple image loading

Q.all([
  Qimage("res1.png"),
  Qimage("res2.png"),
  Qimage("res3.png")
])
.spread(function (res1, res2, res3) {
  document.body.appendChild(res1);
  document.body.appendChild(res2);
  document.body.appendChild(res3);
});

Mixing with Qajax

Qajax.getJSON("http://my-image-service.com/images/today.json?limit=10")
.get("images") // my json has an "images" array
.then(function (images) {
  // wait all images to load
  return Q.all(_.map(images, function (image) {
    return Qimage(image.url);
  }));
})
.then(function (imgs) {
  templatize(imgs);
})
.fail(displayError);