Question

how to use setInterval

Asked by: onyourmark

Hi, I was trying to use the setInterval() function in Javascript but am not getting anywhere. In the code attached there is a function called showAddress() which is called near the end of the page around line 93. This is called within an Ajax call. I am using Ajax to read a file on the server and then parse that file and then use showAddress() to take some of what was read (a location) and then show it on the page (on a map).

I want this showAddress() function to run every minute.

I was trying to use var refreshId = setInterval(function() but cannot get it to work.

<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;
            </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)
                                {
                                        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);
                                        });
 
									   
                                }
        });
});
</script>  
                                          
  
 
            
      </body>
</html>

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Asked On: 2009-08-09 at 22:35:29ID24639058
Tags: javascript jquery setInterval
Topics: JavaScript
,; Jquery
Participating Experts: 2
Points: 500
Comments: 14

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Answers

by: DreamwarePosted on 2009-08-09 at 23:13:30ID: 25057465

What error message is it giving you? I tried setting it up, but Could not reproduce your error since I don't have the xml file you are using.

by: onyourmarkPosted on 2009-08-09 at 23:22:46ID: 25057486

It just does nothing and shows nothing on the page. Can I ask what code you used?
Also, I will attach the file "somefile.xml" but I have to rename it somefile.txt

somefile.txt
- 37 KB
file of some tweets from twitter

by: mplungjanPosted on 2009-08-09 at 23:28:54ID: 25057516

You set some function on each - but I cannot guess when it is triggered.

Perhaps you want

setInterval('showAddress("'+locationText+'","'+ textText+'")',60000);

by: onyourmarkPosted on 2009-08-09 at 23:44:01ID: 25057565

hi. Thanks. I tried that but it is inside the .each function and so it won't show all the results each time but just one at a time (actually it did not even do that). So then I tried the code below but I get a blank map (no markers):
here is the page: http://www.sentimentmining.net/sendToGGroups.html
and here is what it should look like but without a timer (the markers are clickable:
http://www.sentimentmining.net/mapForTwitterWithDescrip4.html

<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;
            </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)
                                { 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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Select all Open in new window

by: mplungjanPosted on 2009-08-09 at 23:46:13ID: 25057571

try this

define

tId = new Array();
outside all functions then

tId[tId.length]=setInterval('showAddress("'+locationText+'","'+ textText+'")',60000);

by: onyourmarkPosted on 2009-08-10 at 00:01:34ID: 25057637

Hi. I think that the setInterval cannot be inside the 'each' function because I want all the markers in the loop to be updated at the same time. So I tried your idea around the whole success response but it still is not working.

<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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Select all Open in new window

by: mplungjanPosted on 2009-08-10 at 00:33:39ID: 25057736

that would not work You would need to do

setInterval(function() { something }, 60000)
to wrap such statements.

I believe you will have to wait for a person better versed in jQuery and scope/closure

by: DreamwarePosted on 2009-08-10 at 02:18:03ID: 25058213

@mplungjan - May I suggest using an anonymous function instead of a string with setInterval? Using a string means that your code is eval'd, which isn't the best way of doing things...

by: mplungjanPosted on 2009-08-10 at 02:19:33ID: 25058221

See my last comment:

setInterval(function() { something }, 60000)

However due to closure issues it MIGHT be better to have the string eval'ed

by: onyourmarkPosted on 2009-08-10 at 03:17:08ID: 25058474

Hi. Thank you. I am not sure how to do that with the code I have. I thought that I did use an anonymous function. Could you say where I can put it and what I should write?

by: mplungjanPosted on 2009-08-10 at 04:51:10ID: 25059005

We meant this (which I am not sure will work due to closure issues)

,success: function(xml) {
tId[tId.length]= setInterval( function() {
var locationText="";
.
.
.
}, 60000);
},
.
.
.

by: mplungjanPosted on 2009-08-10 at 05:04:09ID: 25059082

PS: Could you please note open new identical questions until you have resolved the first ?

by: onyourmarkPosted on 2009-08-10 at 05:14:35ID: 25059159

Hi. Here is what I have. Maybe I have my brackets mixed up but I am not showing any markers. I misinterpreted your previous instructions and thought I should post this in jquery. Thanks.
$(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);
}
});
});

by: mplungjanPosted on 2009-08-10 at 06:10:17ID: 25059566

This is not possible:
{ 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);
}

this might be

{ tId[tId.length]= setInterval(
function() {
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);
}

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