@observablehq/stdlib - npm Package Compare versions

Comparing version 2.0.3 to 2.0.4

dist/stdlib.js

@@ -1,2 +0,2 @@
-// @observablehq/stdlib v2.0.3 Copyright 2018 Observable, Inc.
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package.json

 {
   "name": "@observablehq/stdlib",
-  "version": "2.0.3",
+  "version": "2.0.4",
   "license": "ISC",
@@ -5,0 +5,0 @@ "main": "dist/stdlib.js",

README.md

@@ -62,2 +62,10 @@ # @observablehq/stdlib
 
+The *object* may also be specified as a function, in which case the function is called when the download button is clicked. For example:
+
+```js
+DOM.download(() => new Promise(resolve => canvas.toBlob(resolve)))
+```
+
+If the *object* is a promise, or if it is a function that returns a promise, the promise will be awaited before downloading. If necessary, an additional click may be required to download the asynchronous value.
+
 <a href="#DOM_element" name="DOM_element">#</a> DOM.<b>element</b>(<i>name</i>[, <i>attributes</i>]) [<>](https://github.com/observablehq/stdlib/blob/master/src/dom/element.js "Source")
@@ -64,0 +72,0 @@

src/dom/download.js

@@ -1,11 +0,31 @@
-export default function(object, name, label) {
-  var a = document.createElement("a"),
-      b = a.appendChild(document.createElement("button"));
-  b.textContent = label == null ? "Download" : label;
-  a.download = name == null ? "untitled" : name;
-  a.onclick = function() {
-    var url = a.href = URL.createObjectURL(object);
-    setTimeout(function() { URL.revokeObjectURL(url); }, 50);
+export default function(value, name = "untitled", label = "Save") {
+  const a = document.createElement("a");
+  const b = a.appendChild(document.createElement("button"));
+  b.textContent = label;
+  a.download = name;
+
+  async function reset() {
+    await new Promise(requestAnimationFrame);
+    URL.revokeObjectURL(a.href);
+    a.removeAttribute("href");
+    b.textContent = label;
+    b.disabled = false;
+  }
+
+  a.onclick = async event => {
+    b.disabled = true;
+    if (a.href) return reset(); // Already saved.
+    b.textContent = "Saving…";
+    try {
+      const object = await (typeof value === "function" ? value() : value);
+      b.textContent = "Download";
+      a.href = URL.createObjectURL(object);
+    } catch (ignore) {
+      b.textContent = label;
+    }
+    if (event.eventPhase) return reset(); // Already downloaded.
+    b.disabled = false;
   };
+
   return a;
 }

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Improved metrics

Total package byte prevSize

68791

increased by1.89%

Lines of code

602

increased by3.08%

Number of lines in readme file

795

increased by1.02%

No dependency changes