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WebAPI/WebActivities: Difference between revisions
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Some examples
(add proprietary dependencies) |
(Some examples) |
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bool isActivityHandlerRegistered(ActivityHandler handler); | bool isActivityHandlerRegistered(ActivityHandler handler); | ||
}; | }; | ||
== Examples == | |||
The ''data'' structure used in those the activities used in those examples shouldn't be considered as near to anything final. It is just a snapshot on how it could look like. Those examples goal is to underline the use of the API. | |||
=== Launch an activity === | |||
View a png image: | |||
var a = new Activity({ name: "view", data: { type: "image/png", url: ... }}); | |||
a.onerror = function() { alert("Can't view the image!"); }; | |||
Pick an image: | |||
var a = new Activity({ name: "pick", data: { type: "image/png", multiple: false }}); | |||
a.onsuccess = function() { var image = a.result; doSomethingWithImage(image); }); | |||
a.onsuccess = function() { alert("Failure when trying to pick an image!"); }); | |||
=== Register to handle an activity === | |||
View a png image: | |||
var r = navigator.registerActivityHandler({ name: "view", disposition: "inline", | |||
filters: { type: "image/png" }}); | |||
r.onerror = function() { alert("failed to register activity"); } | |||
View a png/gif image in another page than the current one: | |||
navigator.registerActivityHandler({ name: "view", href: "image-viewer.html", disposition: "inline", | |||
filters: { type: ["image/png", "image/gif"] }}); | |||
View only HTML pages from example.org: | |||
navigator.registerActivityHandler({ name: "view", filters: { url: /https?:\/\/example.org\/.*/ }}); | |||
=== Handle an activity request === | |||
View a png image: | |||
navigator.setMessageHandler('activity', function(a) { | |||
// We can't be handling an activity that isn't what we asked, because of |filters|. | |||
var i = getImageObject(); | |||
i.src = a.source.url; | |||
// We do not call a.postResult() or a.postError() because this activity shouldn't return a value. | |||
}); | |||
Pick an image: | |||
navigator.setMessageHandler('activity', function(a) { | |||
var image = getImageToReturn(); | |||
if (!image) { | |||
a.postError("NoImage"); | |||
return; | |||
} | |||
a.postResult({ type: "image/png", url: image }); | |||
}); | |||