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📝 Say more on sending messages from browser to web page.

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This commit is contained in:
Cheng Zhao 2014-05-07 09:45:39 +08:00
parent a67c54869f
commit f25480dec5
2 changed files with 39 additions and 3 deletions
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33
docs/api/browser-window.md
View file

@ -459,3 +459,36 @@ Evaluate `code` in page.
Send `args..` to the web page via `channel` in asynchronous message, the web
page can handle it by listening to the `channel` event of `ipc` module.
An example of sending messages from browser side to web pages:
```javascript
// On browser side.
var window = null;
app.on('ready', function() {
window = new BrowserWindow({width: 800, height: 600});
window.loadUrl('file://' + __dirname + '/index.html');
window.on('did-finish-load', function() {
window.webContents.send('ping', 'whoooooooh!');
});
});
```
```html
// index.html
<html>
<body>
<script>
require('ipc').on('ping', function(message) {
console.log(message); // Prints "whoooooooh!"
});
</script>
</body>
</html>
```
**Note:**
1. The IPC message handler in web pages do not have a `event` parameter, which
is different from the handlers on browser side.
2. There is no way to send synchronous messages from browser side to web pages,
because it would be very easy to cause dead locks.

9
docs/api/ipc-browser.md
View file

@ -7,6 +7,9 @@ is the `channel` when sending message. To reply a synchronous message, you need
to set `event.returnValue`, to send an asynchronous back to the sender, you can
use `event.sender.send(...)`.
It's also possible to send messages from browser side to web pages, see
[WebContents.send](browser-window.md#webcontentssendchannel-args) for more.
An example of sending and handling messages:
```javascript
@ -34,12 +37,12 @@ ipc.on('asynchronous-reply', function(arg) {
ipc.send('asynchronous-message', 'ping');
```
### Class: Event
## Class: Event
## Event.returnValue
### Event.returnValue
Assign to this to return an value to synchronous messages.
## Event.sender
### Event.sender
The `WebContents` of the web page that has sent the message.