how to prevent this function to be executed more than 2 times in x miliseconds?

Question

how can i prevent this to be executed twice when i get to the bottom of the scroll?

 if  ($(window).scrollTop() == $(document).height() - $(window).height()){
                   last_msg_funtion();
 }

Options i see:

I tried setting a var loading_already == false and, something like:

if(loading_already==false){
     loading_already = true;
     last_msg_function();
     setTimeout('refresh_loading',300);
}

where

function refresh_loading(){ loading_already = false; }

But didn't work out, any suggestion for this?

thanks!

score 2 · Accepted Answer · answered Mar 28 '11 at 03:25

2

loading_already = true;

You have == which is boolean is operator, not assignment.

answered Mar 28 '11 at 03:25

Justin Thomas

5,680
3
38
63

i live rote that so it was a live mistake, thanks. but in my code was ok. should it work? – Toni Michel Caubet Mar 28 '11 at 03:28

jessegavin · Answer 2 · 2011-03-28T03:31:48.587

1

You should use the awesome jQuery throttle/debounce plugin. Makes this sort of thing very easy.

The following example will ensure that las_msg_function is called no more than once every 250 milliseconds (assuming your scroll detection expression is correct);

if ($(window).scrollTop() == $(document).height() - $(window).height()) {
  $.throttle(250, las_msg_function);
}

Here's an example page which shows how this is used in conjunction with scroll detection (look at second example)

edited Mar 28 '11 at 03:31

answered Mar 28 '11 at 03:26

jessegavin

74,067
28
136
164

j is undefined [Interrumpir en este error] (function(b,c){var $=b.jQuery||b.C...d,e,false):a(d,f,e!==false)}})(this); – Toni Michel Caubet Mar 28 '11 at 03:37
and its only executed if like: $.throttle(250, last_msg_funtion()); – Toni Michel Caubet Mar 28 '11 at 03:39
`$.throttle(250, last_msg_funtion());` is not the correct syntax. Read more here: http://benalman.com/code/projects/jquery-throttle-debounce/docs/files/jquery-ba-throttle-debounce-js.html – jessegavin Mar 28 '11 at 04:07

how to prevent this function to be executed more than 2 times in x miliseconds?

2 Answers2