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Postback

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steambird1 edited this page Nov 13, 2022 · 4 revisions

Postback is a new function which is supported since BluePage 2.0. It supports:

<?blue initial

# Function like this will be called if they're listened below.
function [HTML Control]_[HTML Event]:
    # Your code ...
    # Here, you can use 'postback.get' and 'postback.set'.
?>
<?blue postback
listen [HTML Control].[HTML Event]
postback [HTML Control].[HTML Attribute]
on_load [A function that will be executed if the page is loading]
...
?>

Here is a simple multi-thread adder example:

<?blue initial
sender.write_header "HTTP/1.1",200,"OK"
sender.write_attribute "Content-Type","text/html"

function gs_tick:
	set og=atoi (keeper.get "Counter")+(atoi (postback.get "adds","value"))
	postback.set "counter","innerHTML",og
	keeper.set "Counter",og
	keeper.sync
	
function susp_onclick:
	postback.remove_timer "Timer"
	
function page_load:
	postback.add_timer "Timer",1000,"gs_tick",null
?>
<?blue postback
postback counter.innerHTML
postback adds.value
listen susp.onclick
on_load page_load
?>
<!DOCTYPE HTML>
<html>
<body>
<p>Add it by: </p>
<input type="text" id="adds" />
<p>Current Value: <span id="counter"></span></p>
<button id="susp">Don't add anymore</button>
</body>
</html>

Postback cannot be used as index file (index.bp and browse it by /), or the postback will fail.

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