Question

preventing caching in jquery

Asked by: onyourmark

Hi. I am running the following code. It seems that the browser (I am using firefox) is caching the results and so I don't get the updates that Ajax should be showing. Any suggestion for preventing the caching?
Thanks!

<html>
      <head>
 
            <script type="text/javascript" src="http://www.google.com/jsapi?key=ABQIAAAAXGp-Wh7RXs1hPKr-7RuuSxTmrZ1BxykKkHNFRnXTFIyBz45ssBTaMI3cqdUcYN1sGvEQiRTn8kLpYg"></script>
            <script type="text/javascript">
            google.load("jquery", '1.3');
            google.load("maps", "2.x");
            var map;
			tId = new Array();
            </script>
            
            <script type="text/javascript" charset="utf-8">
  
 <!-- This is the initialize function. This sets up a map. It is called when the body finishes loading-->
 
    function initialize() {
      if (GBrowserIsCompatible()) {
        map = new GMap2(document.getElementById("map"));
        map.setCenter(new GLatLng(35.67419,139.708736), 2);
        geocoder = new GClientGeocoder();
		map.addControl(new GSmallMapControl());
		map.addControl(new GMap2TypeControl());
      }
 
    }
                  
<!-- This is the showAddress function. It takes a place name (like Tokyo) and displays it on the map  -->
 
function showAddress(address, text) {
var geocoder = new GClientGeocoder();
  geocoder.getLatLng(
    address,
    function(point) {
      if (!point) {
    
      } else {
        map.setCenter(point, 1);
        var marker = new GMarker(point);
        
        marker.openInfoWindowHtml(address);
 
		GEvent.addListener(marker, 'click',
											function() {
											marker.openInfoWindowHtml(text);
														}
							);
		map.addOverlay(marker);					
      }
    }
  );
}
 
     
            </script>
            
            <script> 
                                                     
                              
                        window.onload=function(){
                                                initialize();
 
                  
                                                };
            </script>
            <style type="text/css" media="screen">
                  #map { float:left; width:750px; height:750px; }
 
            </style>
      </head>
      <body> 
            <div id="map"></div>
 
  <script> 
  
 
<!--  within this section we contact the server to read the file (called 'somefile.xml') -->
<!--  then we continue to use jquery to parse the file we have read. If you take a look at -->
<!--   the somefile.xml you will see it has a 'location' tag <location>. So we want to read that-->
<!--   location and then have the showAddress() function show the location on the map.-->
 
 
 
  $(document).ready(function()
{
        $.ajax({        type:"GET"
                                ,url:"somefile.xml"
                                ,dataType:"xml"
                                ,error:function(XMLHttpRequest, textStatus, errorThrown)
                                {
                                        alert(textStatus);
                                }
                                ,success: function(xml)
                                { tId[tId.length]= setInterval(
                                        var locationText="";
                                        $(xml).find('statuses > status ').each(function()
                                        {
                                                locationText="";
												textText="";
 
                                                locationText += $(this).find('user > location').text();
												//textText += $(this).find('status > text').text();
												textText += $(this).find('text').text();
 
													showAddress(locationText, textText);
                                        });
 
									   }, 10000);
                                }
        });
 
</script>  
                                          
  
 
            
      </body>
</html>

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Asked On: 2009-08-10 at 22:12:28ID24642178
Tags: caching jquery
Topic: Jquery
Participating Experts: 3
Points: 500
Comments: 16

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Answers

by: sammy1971Posted on 2009-08-10 at 22:31:16ID: 25066347

Adding a querystring to the get method should do it
see the more alternatives here
http://stackoverflow.com/questions/367786/prevent-caching-of-ajax-call

Good luck

by: onyourmarkPosted on 2009-08-10 at 22:44:40ID: 25066398

Hi Thanks. It does not seem to be working. Actually I had sent you the wrong code but I tried it anyway but still seems to be caching. Here is the code. Sorry for the mistake:

<html>
      <head>
 
            <script type="text/javascript" src="http://www.google.com/jsapi?key=ABQIAAAAXGp-Wh7RXs1hPKr-7RuuSxTmrZ1BxykKkHNFRnXTFIyBz45ssBTaMI3cqdUcYN1sGvEQiRTn8kLpYg"></script>
            <SCRIPT language="JavaScript" >
            google.load("jquery", '1.3');
            google.load("maps", "2.x");
            var map;
			tId = new Array();
            </script>
            
            <script type="text/javascript" charset="utf-8">
  
 <!-- This is the initialize function. This sets up a map. It is called when the body finishes loading-->
 
    function initialize() {
      if (GBrowserIsCompatible()) {
        map = new GMap2(document.getElementById("map"));
        map.setCenter(new GLatLng(35.67419,139.708736), 2);
        geocoder = new GClientGeocoder();
		map.addControl(new GSmallMapControl());
		map.addControl(new GMap2TypeControl());
      }
 
    }
                  
<!-- This is the showAddress function. It takes a place name (like Tokyo) and displays it on the map  -->
 
function showAddress(address, text) {
var geocoder = new GClientGeocoder();
  geocoder.getLatLng(
    address,
    function(point) {
      if (!point) {
    
      } else {
        map.setCenter(point, 1);
        var marker = new GMarker(point);
        
        marker.openInfoWindowHtml(address);
 
		GEvent.addListener(marker, 'click',
											function() {
											marker.openInfoWindowHtml(text);
														}
							);
		map.addOverlay(marker);					
      }
    }
  );
}
 
     
            </script>
            
            <script> 
                                                     
                              
                        window.onload=function(){
                                                initialize();
 
                  
                                                };
            </script>
            <style type="text/css" media="screen">
                  #map { float:left; width:750px; height:750px; }
 
            </style>
      </head>
      <body> 
            <div id="map"></div>
 
<script> 
 $(document).ready(function()
{
   //ajaxTime.php is called every second to get time from server
   var refreshId = setInterval(function()
   {
     $('#timeval').load('getTweetsTimeLine.php?randval='+ Math.random());
   }, 30000);
 
   //stop the clock when this button is clicked
   //$("#stop").click(function()
   //{
    // clearInterval(refreshId);
   //});
}); 
 
<!--  within this section we contact the server to read the file (called 'somefile.xml') -->
<!--  then we continue to use jquery to parse the file we have read. If you take a look at -->
<!--   the somefile.xml you will see it has a 'location' tag <location>. So we want to read that-->
<!--   location and then have the showAddress() function show the location on the map.-->
 
var t;
 
$(document).ready(function()
{
    omr();
});
 
function omr()
{
        $.ajax({        type:"GET"
                                ,url:"somefile.xml?q=Date().getTime()"
                                ,dataType:"xml"
                                ,error:function(XMLHttpRequest, textStatus, errorThrown)
                                {
                                        alert(textStatus);
                                }
                                ,success: function(xml)
                                {
                                        var locationText="";
                                        $(xml).find('statuses > status ').each(function()
                                        {
                                                locationText="";
                                                                                                textText="";
 
                                                locationText += $(this).find('user > location').text();
                                                                                                //textText += $(this).find('status > text').text();
                                                                                                textText += $(this).find('text').text();
 
                                                                                                        showAddress(locationText, textText);
                                        });
 
                                                                           
                                }
        });
 
    t = setTimeout("omr()",10000); // 1 second
} // omr
 
</script>  
                                          
  
 
            
      </body>
</html>

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by: Seo_ExpertPosted on 2009-08-10 at 22:46:25ID: 25066410

Hello,

Try below URL:

http://www.i18nguy.com/markup/metatags.html
Add HTML header
<META HTTP-EQUIV="CACHE-CONTROL" CONTENT="NO-CACHE">

changes below code in javascript::

$.ajax({ type:"GET"
,url:"somefile.xml?sid="+Math.random()
,dataType:"xml"

 $.ajax({        type:"GET"
                                ,url:"somefile.xml?sid="+Math.random()
                                ,dataType:"xml"

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by: sammy1971Posted on 2009-08-10 at 23:32:10ID: 25066573

as indicate in the link I posted earlier, you can use ajax function instead of Jquery Get,

have you tried using $.ajax({url: "somefile.xml", success: callBackfunction, cache: false});

or you can use ajaxoptions to disable caching for all ajax calls generated by jQuery

http://docs.jquery.com/Ajax/jQuery.ajaxSetup

by: onyourmarkPosted on 2009-08-10 at 23:36:28ID: 25066591

Thanks. It still seems to not quite be working and now I am sometimes getting a parse error. Here is the webpage: http://www.sentimentmining.net/sendToGGroupsOmrNoCache1.html

And I will paste in the code from the page called getTweetsTimeLine.php

 <?php
    $curl = curl_init();
    $fp = fopen("somefile.xml", "w");
    curl_setopt ($curl, CURLOPT_URL, "http://twitter.com/statuses/public_timeline.xml");
    curl_setopt($curl, CURLOPT_FILE, $fp);
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
 
    $result = curl_exec ($curl);
	echo $result;
 // Need to write to your local file, or else it will be empty
    fwrite($fp, $result);
    // It's a good idea to explicitly close your file handles in your code rather than relying on PHP to clean it up for you
    fclose($fp);
 
    curl_exec ($curl);
    curl_close ($curl);
?>

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by: sammy1971Posted on 2009-08-11 at 00:29:21ID: 25066777

looks good but for one thing, the page keeps alerting parser error in both IE and firefox.
what about users whith javascript disabled? do you intend to ask them to enable javascript or just ignore them?
I would recommend the server perform the same task in case javascript is disabled.

by: onyourmarkPosted on 2009-08-11 at 00:46:54ID: 25066849

hi, thank you. Do you know what the parser error is? Because sometimes there is a parser error but other times there is none. I will try to do something server side but I want this one to work first.

by: onyourmarkPosted on 2009-08-11 at 00:49:16ID: 25066862

And actually, although the page is reloading it does not seem as though it is changing the tweets or the locations of the tweets.
Thanks.

by: sammy1971Posted on 2009-08-11 at 00:54:12ID: 25066875

No I cant really tell you what is the error, What I would do is do more debuging and see why its happening in some cases only, it can be data formatting issues or something as simple as that.

Good luck

by: onyourmarkPosted on 2009-08-11 at 02:25:45ID: 25067261

Ok. I tried using $.ajax({url: "somefile.xml", success: callBackfunction, cache: false}); but I still don't really seem to be getting new entries onto the map with code:
var refreshId = setInterval(function()
{
$('#timeval').load('getTweetsTimeLine.php?randval='+ Math.random());
}, 30000);

And if I check the xml file it seems that it is not changing and hasn't changed for 2 hours even though I am running the page now. It says last modified about 2 hours ago. HOWEVER, if I actually download the xml file to my computer and check it, it is different from the one from a minute earlier???
Cannot figure it out

<html>
      <head>
			<META HTTP-EQUIV="CACHE-CONTROL" CONTENT="NO-CACHE">
            <script type="text/javascript" src="http://www.google.com/jsapi?key=ABQIAAAAXGp-Wh7RXs1hPKr-7RuuSxTmrZ1BxykKkHNFRnXTFIyBz45ssBTaMI3cqdUcYN1sGvEQiRTn8kLpYg"></script>
            <SCRIPT language="JavaScript" >
            google.load("jquery", '1.3');
            google.load("maps", "2.x");
            var map;
			tId = new Array();
            </script>
            
            <script type="text/javascript" charset="utf-8">
  
 <!-- This is the initialize function. This sets up a map. It is called when the body finishes loading-->
 
    function initialize() {
      if (GBrowserIsCompatible()) {
        map = new GMap2(document.getElementById("map"));
        map.setCenter(new GLatLng(35.67419,139.708736), 2);
        geocoder = new GClientGeocoder();
		map.addControl(new GSmallMapControl());
		map.addControl(new GMap2TypeControl());
      }
 
    }
                  
<!-- This is the showAddress function. It takes a place name (like Tokyo) and displays it on the map  -->
 
function showAddress(address, text) {
var geocoder = new GClientGeocoder();
  geocoder.getLatLng(
    address,
    function(point) {
      if (!point) {
    
      } else {
        map.setCenter(point, 1);
        var marker = new GMarker(point);
        
        marker.openInfoWindowHtml(address);
 
		GEvent.addListener(marker, 'click',
											function() {
											marker.openInfoWindowHtml(text);
														}
							);
		map.addOverlay(marker);					
      }
    }
  );
}
 
     
            </script>
            
            <script> 
                                                     
                              
                        window.onload=function(){
                                                initialize();
 
                  
                                                };
            </script>
            <style type="text/css" media="screen">
                  #map { float:left; width:750px; height:750px; }
 
            </style>
      </head>
      <body> 
            <div id="map"></div>
 
<script> 
 $(document).ready(function()
{
   //ajaxTime.php is called every second to get time from server
   var refreshId = setInterval(function()
   {
     $('#timeval').load('getTweetsTimeLine.php?randval='+ Math.random());
   }, 30000);
 
   //stop the clock when this button is clicked
   //$("#stop").click(function()
   //{
    // clearInterval(refreshId);
   //});
}); 
 
<!--  within this section we contact the server to read the file (called 'somefile.xml') -->
<!--  then we continue to use jquery to parse the file we have read. If you take a look at -->
<!--   the somefile.xml you will see it has a 'location' tag <location>. So we want to read that-->
<!--   location and then have the showAddress() function show the location on the map.-->
 
var t;
 
$(document).ready(function()
{
    omr();
});
 
function omr()
{
$.ajax({url: "somefile.xml", success: callBack, cache: false});
                              
                                 function callBack(xml)
                                {
                                        var locationText="";
                                        $(xml).find('statuses > status ').each(function()
                                        {
                                                locationText="";
                                                                                                textText="";
 
                                                locationText += $(this).find('user > location').text();
                                                                                                //textText += $(this).find('status > text').text();
                                                                                                textText += $(this).find('text').text();
 
                                                                                                        showAddress(locationText, textText);
                                        });
 
                                                                           
                                }
       
 
    t = setTimeout("omr()",10000); // 1 second
} // omr
 
</script>  
                                          
  
 
            
      </body>
</html>

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by: hieloPosted on 2009-08-11 at 14:24:33ID: 25073623

I pasted this http://twitter.com/statuses/public_timeline.xml on the browser and refreshed a few times. The issue that I found was that sometimes it times out, in which case, twitter is NOT returning an XML file to your script above(ID:25066591). So when that happens and you do:
echo $result;

you are not really echoing back any xml, so your script is correctly alerting you of the parseError. Eventually, you will make a request that will not timeout, and the parseError will go away (temporarily until a subsequent request timesout again).

My suggestion is to check the returned data, and overwrite your xml file on the server ONLY if data was returned:

 <?php	//getTweetsTimeline.php
	$curl = curl_init();
	$fp = fopen("somefile.xml", "w");
	curl_setopt ($curl, CURLOPT_URL, "http://twitter.com/statuses/public_timeline.xml");
	curl_setopt($curl, CURLOPT_FILE, $fp);
	curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
 
	$result = curl_exec ($curl);
	if( FALSE !== $result )
	{
		//send the "Fresh" result
		echo $result;
 
		// Need to write to your local file, or else it will be empty
		fwrite($fp, $result);
 
		// It's a good idea to explicitly close your file handles in your code rather than relying on PHP to clean it up for you
		fclose($fp);
	}
	else
	{
		//send a blank XML result. Due to the "filtering" that you are doing, not matches will
		//be found so your content will not update, but you should NOT see the parseError either
		echo "<statuses></statuses>";
	}
 
 	//you already called curl_exec above. You don't need to do so again.
	//curl_exec ($curl);
    curl_close ($curl);
?> 
 
Also, read the comments in the html below.
 
 
<html>
      <head>
			<META HTTP-EQUIV="CACHE-CONTROL" CONTENT="NO-CACHE">
            <script type="text/javascript" src="http://www.google.com/jsapi?key=ABQIAAAAXGp-Wh7RXs1hPKr-7RuuSxTmrZ1BxykKkHNFRnXTFIyBz45ssBTaMI3cqdUcYN1sGvEQiRTn8kLpYg"></script>
            <SCRIPT language="JavaScript" >
            google.load("jquery", '1.3');
            google.load("maps", "2.x");
            var map;
			tId = new Array();
            </script>
            
            <script type="text/javascript" charset="utf-8">
  
// This is the initialize function. This sets up a map. It is called when the body finishes loading
 
    function initialize() {
      if (GBrowserIsCompatible()) {
        map = new GMap2(document.getElementById("map"));
        map.setCenter(new GLatLng(35.67419,139.708736), 2);
        geocoder = new GClientGeocoder();
		map.addControl(new GSmallMapControl());
		map.addControl(new GMap2TypeControl());
      }
 
    }
                  
// This is the showAddress function. It takes a place name (like Tokyo) and displays it on the map
 
function showAddress(address, text) {
var geocoder = new GClientGeocoder();
  geocoder.getLatLng(
    address,
    function(point) {
      if (!point) {
    
      } else {
        map.setCenter(point, 1);
        var marker = new GMarker(point);
        
        marker.openInfoWindowHtml(address);
 
		GEvent.addListener(marker, 'click',
											function() {
											marker.openInfoWindowHtml(text);
														}
							);
		map.addOverlay(marker);					
      }
    }
  );
}
 
     
/*
If you are using jquery then call initialize from $(document).ready(). Look at how I combined
every thing into a single script tag.
 
Also STOP using html comments within script tags in place of javascript comments.
                        window.onload=function(){
                                                initialize();
                                                };
*/
            </script>
            <style type="text/css" media="screen">
                  #map { float:left; width:750px; height:750px; }
 
            </style>
      </head>
      <body> 
            <div id="map"></div>
 
<script type="text/javascript"> 
var t;
 $(document).ready(function()
{
	initialize();
 
 
   //ajaxTime.php is called every second to get time from server
   var refreshId = setInterval(function()
   {
     $('#timeval').load('getTweetsTimeLine.php?randval='+ Math.random());
   }, 30000);
 
   //stop the clock when this button is clicked
   //$("#stop").click(function()
   //{
    // clearInterval(refreshId);
   //});
 
 
/*
  within this section we contact the server to read the file (called 'somefile.xml') 
  then we continue to use jquery to parse the file we have read. If you take a look at 
   the somefile.xml you will see it has a 'location' tag <location>. So we want to read that
   location and then have the showAddress() function show the location on the map
*/
    omr();
});
 
function omr()
{
$.ajax({url: "somefile.xml", success: callBack, cache: false});
                              
                                 function callBack(xml)
                                {
                                        var locationText="";
                                        $(xml).find('statuses > status ').each(function()
                                        {
                                                locationText="";
                                               textText="";
                                                locationText += $(this).find('user > location').text();
                                                                                                //textText += $(this).find('status > text').text();
                                                                                                textText += $(this).find('text').text();
                                                                                                        showAddress(locationText, textText);
                                        });
                                      
                                }
 
    t = setTimeout("omr()",10000); // 1 second
} // omr
 
</script>  
       </body>
</html>

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Select all Open in new window

by: onyourmarkPosted on 2009-08-11 at 19:17:02ID: 25075222

Ok. I will try it. I think I am still getting the caching.

by: hieloPosted on 2009-08-12 at 07:06:37ID: 25078826

>>I think I am still getting the caching.
Try:
...{url: "somefile.xml?id="+(new Date()).valueOf(), ...

by: onyourmarkPosted on 2009-08-13 at 03:06:29ID: 25086700

Hi. Thank you. I still cannot figure it out. In both firefox and IE it seems to be caching. As soon as I manually refresh the page I get a different set of markers but otherwise even though the map moves the markers are the same:
http://www.sentimentmining.net/sendToGGroupsOmrNoCache3.html

by: hieloPosted on 2009-08-13 at 13:20:01ID: 25092439

The Web Developer Toolbar for FF is reporting:

Error: this.dc is not a function
Source File: http://maps.gstatic.com/intl/en_us/mapfiles/171b/maps2.api/main.js
Line: 752

You need to address all runtime errors first! If you are obfuscating that main.js file, then try using the unobfuscated version to narrow down the problem.

by: onyourmarkPosted on 2009-08-15 at 02:49:02ID: 31614069

Thanks

20120131-EE-VQP-002

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