unix - Javascript refresh function problem -

-

i have problem following javascript code. want run background check (check.php) process on unix server. execution time of php , response takes 1.2-1.5 seconds (did test in mozilla) i've come script below refresh , check what's going on process , change background of div accordingly. right now, after few refreshes hangs, because think goes loop , doesn't wait first function finish , piles up. ideas doing wrong? more simpler way it?

<script language="javascript" type="text/javascript">      function getval(param)     {         var strurl = param;         var req = new xmlhttprequest();         req.open("get", strurl, false); //third parameter set false here         req.send(null);         return req.responsetext;     }      function changedivimage()     {            var pid = getval("check.php")         var imgpath = new string();         imgpath = document.getelementbyid("status_body").style.backgroundimage;              if(pid == 2)             {                 document.getelementbyid("status_body").style.backgroundimage = "url(active.png)";             }             else             {                 document.getelementbyid("status_body").style.backgroundimage = "url(down.png)";             }         changetimer();     }      function changetimer()     {         setinterval( "changedivimage()", 5000 );     }     </script>

setinterval keep calling funciton on , over, calling changetimer funciton again after changedivimage returns stack more , more unwanted functions. try this:

<script language="javascript" type="text/javascript">      function getval(param)     {         var strurl = param;         var req = new xmlhttprequest();         req.open("get", strurl, false); //third parameter set false here         req.send(null);         return req.responsetext;     }     //this function calls self automatically , again everytime      //but when finishes operations.  (function changedivimage() {        var pid = getval("check.php")     var imgpath = new string();     imgpath = document.getelementbyid("status_body").style.backgroundimage;          if(pid == 2)         {             document.getelementbyid("status_body").style.backgroundimage = "url(active.png)";         }         else         {             document.getelementbyid("status_body").style.backgroundimage = "url(down.png)";         }       settimeout(changedivimage, 5000); })();


Comments

Post a Comment

Popular posts from this blog

javascript - Enclosure Memory Copies -

-
function myclass() { //lots , lots of vars , code here. this.bar = function() { //do numerous enclosed myclass vars } this.foo = function() { alert('hello'); //don't enclosed variables. } } each instance of myclass gets own copy of bar , foo, why prototyped methods use less memory. however, know more memory use of inner methods. it seems obvious me (1) below must true. agree? not distinct myclass instances have own distinct copies of bar, must have own distinct copies of myclass enclosure. (or else how bar method keep myclass variables straight on per instance basis?) now (2) question i'm after. since inner foo method doesn't use in myclass enclosure natural qustion is: javascript smart enough not keep myclass enclosure in memory use of foo? this depend entirely on implementation not language. naive implementations keep far more around others. answer true e.g. v8 (chrome's js engine) may not true spider...
Read more

php - Replacing tags in braces, even nested tags, with regex -

-
example preg_replace('/\{[a-za-z.,\(\)0-9]+\}/', 'replaced', 'lorem ipsum dolor sit {tag1({tag2()})}, consectetur adipiscing elit.'); the result: lorem ipsum dolor sit {tag1(replaced)}, consectetur adipiscing elit. question as can see "tag2" has been replaced, want replace "tag1" know how can this? (in cases might this: {tag1({tag2({tag3()})})}) , on.) btw using preg_replace_callback, easier show preg_replace here site can test code: http://www.spaweditor.com/scripts/regex/index.php you need add curly braces character set. here's pattern used: /\{[a-za-z.,\(\)\{\}0-9]+\}/ and here result: "lorem ipsum dolor sit replaced, consectetur adipiscing elit."
Read more