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Editorial: add more examples #238

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Jun 7, 2022
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Editorial: add more examples #238

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74 changes: 72 additions & 2 deletions index.html
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Original file line number Diff line number Diff line change
Expand Up @@ -75,11 +75,14 @@
<h2>
Usage Examples
</h2>
<h3>
Sharing text and links
</h3>
<p>
This example shows a basic share operation. In response to a button
click, this JavaScript code shares the current page's URL.
</p>
<pre class="example javascript" title="Basic usage">
<pre class="example javascript" title="Sharing text and URL">
shareButton.addEventListener("click", async () =&gt; {
try {
await navigator.share({ title: "Example Page", url: "" });
Expand All @@ -99,9 +102,33 @@ <h2>
display a picker or chooser dialog, allowing the user to select a
target to share this title and the page URL to.
</p>
<h3>
Sharing a file
</h3>
<p>
This example shows how to share a file. Note that the
{{ShareData/files}} member is an array, allowing for multiple files to
be shared.
</p>
<pre class="example javascript" title="Sharing a file">
shareButton.addEventListener("click", async () =&gt; {
const file = new File(data, "some.png", { type: "image/png" });
try {
await navigator.share({
title: "Example File",
files: [file]
});
} catch (err) {
console.error("Share failed:", err.message);
}
});
</pre>
<h3>
Validating a share
</h3>
<p>
Calling {{Navigator/canShare()}} method with a {{ShareData}} dictionary
[=validate share data|validates=] the shared data. unlike
[=validate share data|validates=] the shared data. Unlike
{{Navigator/share()}}, it can be called without [=transient
activation=].
</p>
Expand All @@ -118,6 +145,49 @@ <h2>
// The URL is valid and can probably be shared...
}
</pre>
<h3>
Checking if members are supported
</h3>
<p>
Because of how WebIDL dictionaries work, members passed to
{{Navigator/share(())}} that are unknown to the user agent are ignored.
This can be a problem when sharing multiple members, but the user agent
doesn't support sharing one of those members. To be sure that every
member being passed is supported by the user agent, you can pass them
to {{Navigator/canShare()}} individually to check if they are
supported.
</p>
<pre class="js example" title="Future-proofing shares">
const data = {
title: "Example Page",
url: "https://example.com",
text: "This is a text to share",
someFutureThing: "some future thing",
};
const allSupported = Object.entries(data).every(([key, value]) =&gt; {
return navigator.canShare({ [key]: value });
});
if (allSupported) {
await navigator.share(data);
}
</pre>
<p>
Alternatively, you can adjust application's UI to not show UI
components for unsupported members.
</p>
<pre class="js example" title="Filtering out unsupported members">
const data = {
title: "Example Page",
url: "https://example.com",
text: "This is a text to share",
someFutureThing: "some future thing",
};

// Things that are not supported...
const unsupported = Object.entries(data).filter(([key, value]) =&gt; {
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There's an interesting workaround that supports single call (whatwg/webidl#107 (comment)):

let supported = false;
supported = navigator.canShare({
  title: "Example Page",
  url: "https://example.com",
  text: "This is a text to share",
  get someFutureThing() {
    supported = true;
    return "some future thing";
  }
}) && supported;

Hacky, yeah.

return !navigator.canShare({ [key]: value });
});
</pre>
</section>
<section>
<h2>
Expand Down