Update server side code from client side on interval

Language

JavaScript (Client)

Tags

Author

Thomas Adrian

Submitted on

June 27, 2012 at 2:19 PM

Rating

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110

Notes

Use this code to update a specified ID on your xpage at a specified interval. This is useful for any backend content that frequently change and you want to show the latest infomation to the user without any need for the users to reload the page.

In the snippet above I start 3 different interval request which updates 3 different computed fields at different times. if you e.g put @Now() in the computedField and set the interval to 1000 (1 sec), then you will see the clock update every second.

You can specify any control id, like a repeat or panel. this way you can for instance easily create a facebook notification system, or update a news stream. Basically any server side code you put in the control id will update at the specified interval.

some sample uses are

- check if there is new content created since the user loaded the page
- check if there is new content edited since the user loaded the page
- check which users are onlne.
- check if user got new mail
- Look for external content from other websites or other internal systems.

put the code in client side javascript scriptlbrary.

// unique global variables for each interval
var num1;
var num2;
var num3;


// start each interval on page load
dojo.addOnLoad(function(){
	num1 = setInterval("updateID('computedField1','num1');",10000);
	num2 = setInterval("updateID('computedField2','num2');",15000);
	num3 = setInterval("updateID('computedField3','num3');",22000);
});


// Update the id using partial refresh
function updateID(idname, num){
	var id = dojo.query("*[id$='" + idname + "']")[0];
	if(id){
		XSP.partialRefreshGet(id.id,{
			onStart:function(){},
			onError:function(){return false;},
			onComplete:function(){}
		});
	}else{
		num = clearInterval(num);	
	}
}

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