You can use the [`setOptions()`][1] method on the map object:

    map.setOptions({draggable: false, zoomControl: false, scrollwheel: false, disableDoubleClickZoom: true});

If this doesn&#39;t prevent zooming, you could always set the minimum and maximum zoom to the current zoom level.

There is also the `disableDefaultUI` option, which probably takes all of these events into account, but it might disable clicking on existing elements.


  [1]: http://code.google.com/apis/maps/documentation/javascript/reference.html#MapOptions

@ScottE&#39;s answer pointed me in the right direction of using `map.setOptions()`. However, from the [API documentation](https://developers.google.com/maps/documentation/javascript/interaction), I found that there is a more elegant set of options to set. Perhaps these are newer than the answer, but they work pretty well for me.

    function disablePanningAndScrolling()
    {
        map.setOptions({
            zoomControl: false,
            gestureHandling: &#39;none&#39;
        });
    }

This completely disables zooming and panning.

To return things to normal, just set the properties back to their defaults:



    function enablePanningAndScrolling()
    {
        map.setOptions({
            zoomControl: true,
            gestureHandling: &#39;greedy&#39; // or &#39;cooperative&#39;*
        });
    }

*: the default is greedy if the page isn&#39;t scrollable, cooperative when it is. Pick whichever was the situation in your application.

I have made an application for my client by keeping target iOS as 4.  
But since the application still not submitted to Apple store, my client is planning to upgrade it for iOS 5.0.  

For this I read the [guideline from Apple][1] and found that &quot;Only user-generated data or that cannot otherwise be recreated by your application, should be stored in the &lt;Application_Home&gt;/Documents directory and rest should be stored to &lt;Application_Home&gt;/Library/Caches directory&quot; 

In my application, I am using server model of in-app purchase for non-consumable product. For this I am storing all my downloaded data (which are basically books or magazines) to Documents directory. The Database is also present in the same directory which contains the details about the downloaded products.  

My question is,  
1. Should I have to change my code to store the downloaded data to Library/Caches directory instead of to the Documents directory?  
2. Where should my database file be placed (to Documents or Caches)?  

If I put it products in the Caches then I have to change the logic of retrieval also, since it is considered that if record is present in database, there is no need change the existence of the file and it directly opens it when user clicks on the magazine.  

Kindly guide me on this issue.  
Thanks in advance.

**UPDATED:**  
I am updating this for those who are still not sure about this problem.  
Using the guideline of accepted answer, I have implemented this in 2 of my applications and submitted them to Apple Store. Both were approved in review.  
This may promote that the solution suggested in the accepted answer is correct.  

  [1]: https://developer.apple.com/icloud/documentation/data-storage/

iOS 5 does not allow to store downloaded data in Documents directory?

It seems weird that I couldn&#39;t find an explanation of the difference between those two helpers, so I would assume that is something obvious but I missed.

Basically I am trying to decide which one I should use for my case, with the following simple Model:


    public class Booking
        {
            public int ID { get; set; }
            public Room Room { get; set; }
            public DateTime StartTime { get; set; }
            public DateTime EndTime { get; set; }
            public ICollection&lt;Equipment&gt; Equipments { get; set; }
            public string Who { get; set; }
        }

and I want display a simple Room DropDownlist for Adding and Editing Booking record.

After doing a lots of Google around, it seems that I probably need a DropDopwListFor, but not sure why and how?

Difference between DropDownlist or DropDownListFor Html helper

I want to add codes inside disable() function to disable dragging and zooming in Google maps API v3 by clicking on &#39;disable&#39; button. 

    &lt;script type=&quot;text/javascript&quot;&gt;
       var map;

      function initialize() {
    var uluru = new google.maps.LatLng(21, 57);
    map = new google.maps.Map(document.getElementById(&quot;map&quot;), {
      zoom: 6,
      center: uluru,
      mapTypeId: google.maps.MapTypeId.HYBRID
    });
    }


    function disable(){

    }

    &lt;/script&gt;


    &lt;body onload=&quot;initialize()&quot; &gt;

	   &lt;input type=&quot;button&quot; id=&quot;next&quot; value=&quot;disableZoomDrag&quot; onclick=&quot;disable()&quot;&gt;

    &lt;/body&gt;


disable zooming dragging in Google maps by clicking on a button

I want to add codes inside disable() function to disable dragging and zooming in Google maps API v3 by clicking on 'disable' button.
<pre><code class="hljs language-php-template">&#x3C;script type="text/javascript">
 var map;

 function initialize() {
var uluru = new google.maps.LatLng(21, 57);
map = new google.maps.Map(document.getElementById("map"), {
 zoom: 6,
 center: uluru,
 mapTypeId: google.maps.MapTypeId.HYBRID
});
}


function disable(){

}

&#x3C;/script>


&#x3C;body onload="initialize()" >

 &#x3C;input type="button" id="next" value="disableZoomDrag" onclick="disable()">

&#x3C;/body>
</code></pre>

What is the difference (if there is any) between

    x = Array()

and

    x = new Array()

Which one should I use?

Array() vs new Array()

# DO YOU KNOW SOME MORE BEST PRACTICES FOR CANVAS?? 

## Please add to this thread what you know, have learned, or have read online any and all Canvas best practices, tips/tricks for performance

With Canvas being still very new to internet, and no signs of it ever getting old that I can see in the future, there are not too many documented &quot;best practices&quot; or other really important tips that are a &#39;must know&#39; for developing with it in any one particular place. Things like this are scattered around and many times on lesser known sites. 

**There&#39;s so many things that people need to know about, and still so much to learn about too.** 

----------


I wanted to share some things to help people who are learning Canvas and maybe some who already know it quite well and am hoping to get some feedback from others about what they feel are some best practices or other tips and tricks for working with Canvas in HTML5. 

I want to start off with one I personally found to be quite a useful yet surprisingly uncommon thing for developers to do.

# 1. Indent your code

Just as you would any other time, in any other language whatever the case may be. It has been a best practice for everything else, and I have come to find that in a complex canvas app, things can get a little confusing when dealing with several different contexts and saved/restore states. Not to mention the code is just more readable and overall cleaner looking too. 

For example:

    ...
    // Try to tell me this doesn&#39;t make sense to do
    ctx.fillStyle = &#39;red&#39;;
    ctx.fill();
    ctx.save();
        if (thing &lt; 3) {
            // indenting
            ctx.beginPath();
                ctx.arc(2, 6, 11, 0, Math.PI*2, true);
            ctx.closePath();
            ctx.beginPath();
                ctx.moveTo(20, 40);
                ctx.lineTo(10, 200);
                ctx.moveTo(20, 40);
                ctx.lineTo(100, 40);
            ctx.closePath();
            ctx.save();
                ctx.fillStyle = &#39;blue&#39;
                ctx.fill();
            ctx.restore();
        } else { 
            // no indenting
            ctx.drawImage(img, 0, 0, 200, 200);
            ctx.save();
            ctx.shadowBlur();
            ctx.beginPath();
            ctx.arc(2, 60, 10, 0, Math.PI*2, false);
            ctx.closePath();
            ctx.fillStyle &#39;green&#39;;
            ctx.fill();
            ctx.restore();
        }
    ctx.restore();
    ctx.drawRect();
    ctx.fill();
    ...

Is the IF statement not easier and cleaner to read and know what is what immediately going on than the ELSE statement in this? Can you see what I&#39;m saying here? I think this should be a method that developers should continue to practice just as they would when writing plain &#39;ol javascript or any other language even.


# Use requestAnimationFrame instead of setInterval / setTimeout

setInterval and setTimeout were never intended to be used as animation timers, they&#39;re just generic methods for calling functions after a time delay.  If you set an interval for 20ms in the future, but your queue of functions takes longer than that to execute, your timer won&#39;t fire until after these functions have completed.  That could be a while, which isn&#39;t ideal where animation is concerned. **RequestAnimationFrame** is a method which tells the browser that an animation is taking place, so it can optimize repaints accordingly.  It also throttles the animation for inactive tabs, so it won&#39;t kill your mobile device&#39;s battery if you leave it open in the background.

Nicholas Zakas wrote a hugely detailed and informative [article about requestAnimationFrame](http://www.nczonline.net/blog/2011/05/03/better-javascript-animations-with-requestanimationframe/) on his blog which is well worth reading.  If you want some hard and fast implementation instructions, then [Paul Irish has written a requestAnimationFrame shim](http://paulirish.com/2011/requestanimationframe-for-smart-animating/) – this is what I&#39;ve used in every one of the Canvas apps I have made until recently.

## ACTUALLY

Even better than using requestAnimationFrame in place of setTimeout and setInterval, Joe Lambert has written a [NEW and improved shim](http://blog.joelambert.co.uk/2011/06/01/a-better-settimeoutsetinterval/) called requestInterval and requestTimeout, which he explains what issues exist when using requestAnimFrame.
You can view the [gist of the script](https://gist.github.com/1002116#file_request_interval.js).

## ACTUALLY x2

Now that all the browsers have caught up on the spec for this, there has been an [update to the requestAnimFrame() polyfill](http://my.opera.com/emoller/blog/2011/12/20/requestanimationframe-for-smart-er-animating), one which will probably remain the one to use to cover all vendors. 


# Use more than one canvas 

A technique for animation-heavy games which [@nicolahibbert](https://twitter.com/nicolahibbert) wrote about in a [post of hers on optimizing Canvas games](http://nicolahibbert.com/optimising-html5-canvas-games/) mentions that it may be better to use multiple canvasses layered on top of one another rather than do everything in a single canvas. Nicola explains that &quot;drawing too many pixels to the same canvas at the same time will cause your frame rate to fall through the floor. Take Breakout for example. Trying to draw the bricks, the ball, the paddle, any power-ups or weapons, and then each star in the background – this simply won&#39;t work, it takes too long to execute each of these instructions in turn. By splitting the starfield and the rest of the game onto separate canvases, you are able to ensure a decent framerate.&quot;

## Render Elements Off-screen

I have had to do this for a few apps I&#39;ve made including [Samsung&#39;s Olympic Genome Project facebook app][1]. It&#39;s an extremely useful thing to know and to make use of whether it&#39;s needed or not. It decreases load time immensely, plus it can be a really useful technique to load images off screen since they can sometimes take a while.

    var tmpCanvas = document.createElement(&#39;canvas&#39;),
        tmpCtx = tmpCanvas.getContext(&#39;2d&#39;),
        img = document.createElement(&#39;img&#39;);
    
    img.onload = function() {
        tmpCtx.drawImage(thumbImg, 0, 0, 200, 200);
    };
    img.src = &#39;/some/image/source.png&#39;;

Notice that the src of the image is set after it is loaded. This is a key thing to remember to do too. Once the images are done loading and drawn into these temp canvases, you can then draw them to your main canvas by using the same ctx.drawImage(), but instead of putting the image as the first argument, you use &#39;tmpCtx.canvas&#39; to reference the temp canvas.


### Other tips, tricks and resources

 - **[Canvas test cases](http://philip.html5.org/tests/canvas/suite/tests/)**
 - **[Some more canvas and JS tests](http://kangax.github.com/jstests/)**
 - **[HTML5Rocks performance Improving](http://www.html5rocks.com/en/tutorials/canvas/performance/)**
 - **[requestAnimFrame to Optimize Dragging Events](http://blog.digitalbackcountry.com/2012/05/using-requestanimationframe-to-optimize-dragging-events/)

### Canvas has a back-reference

The 2d context has a back reference to it&#39;s associated DOM element:

    var ctx = doc.getElementById(&#39;canvas&#39;).getContext(&#39;2d&#39;);
    console.log(ctx.canvas);    // HTMLCanvasElement



I&#39;d love to hear more from other people on this. I am working on making a list of things that we should standardize to add a new section to my company&#39;s [Front-end Code Standards and Best Practices](http://na.standards.com/standards). I&#39;d love to get as much feedback on this as I can.


  [1]: http://www.facebook.com/samsunggenomeproject/app_197458140327772

HTML5 Canvas Performance and Optimization Tips, Tricks and Coding Best Practices

I have run into an odd situation. I&#39;m writing a JavaScript bookmarklet that will allow users to click and share external websites to our website very easily and quickly. It simply get&#39;s the title, page URL, and if they&#39;ve selected any text on the page, it grabs it too.

The problem is it doesn&#39;t work with external domains for some reason, so if we use it internally we end up with a share window with the URL formatted like this:

http://internaldomain.com/sharetool.php?shareid=http://internaldomain.com/anotheroddpage.html&amp;title=....

That works just fine, BUT if we try to use an external domain and end up with a URL formatted like this:

http://internaldomain.com/sharetool.php?shareid=http://externaldomain.com/coolpagetoshare.html&amp;title=...

Then we get a *Forbidden Error* on our page and can&#39;t load it... If we manually remove the `http://` from the externaldomain address, it loads just fine again.

So.. I&#39;m thinking the best solution to get around this problem is to modify the JavaScript bookmarklet to remove the `http` as it&#39;s loading the window. Here is how my current bookmarklet looks:

    javascript:var d=document,w=window,e=w.getSelection,k=d.getSelection,x=d.selection,s=(e?e():(k)?k():(x?x.createRange().text:0)),f=&#39;http://internaldomain.com/sharetool.php&#39;,l=d.location,e=encodeURIComponent,u=f+&#39;?u=&#39;+e(l.href)+

As you can see, `e(l.href)` is where the URL is passed.

How can I modify that so it removes the external domains `http://`?



How to remove &#39;http://&#39; from a URL in JavaScript

What is the equivalent code of `window[&quot;functionName&quot;](arguments)` in NodeJS server-side?




Equivalent of &quot;window[&quot;functionName&quot;](arguments)&quot; in server-side

How can a checkbox be checked/unchecked using JavaScript?

Check/Uncheck checkbox with JavaScript

I&#39;m working on an ajax google maps script and I need to create dynamic variable names in a for loop.

    for (var i = 0; i &lt; coords.length; ++i) {
        var marker+i = &quot;some stuff&quot;;
    }

What I want to get is: `marker0`, `marker1`, `marker2` and so on.
and I guess there is something wrong with `marker+i`

Firebug gives me this: `missing ; before statement`




How do I create dynamic variable names inside a loop?

I need to develop an application using `Google Maps` in Android to locate my *current location* and need to *find nearest location*.

(For example: **Nearby police station from my current location**.)

It should accept my current location and output should display nearest place.

Can anyone help me to give some suggestion,links,tutorial to do that?
 

Show Current Location and Nearby Places and Route between two places using Google Maps API in Android

I&#39;m inserting a very basic Google map into my page and the zoom control and streetmap icon are not visible, however if I place my mouse over where they should be I can zoom the map and enter streetview. 
So the controls are there just not visible.

    &lt;script type=&quot;text/javascript&quot;
	    src=&quot;//maps.googleapis.com/maps/api/js?key=&lt;apikey&gt;&amp;sensor=false&amp;region=IT&quot;&gt;
	&lt;/script&gt;

	var myOptions = {
		zoom: 17,
		center: latlng,
		panControl: true,
		zoomControl: true,
		zoomControlOptions: {
			style: google.maps.ZoomControlStyle.LARGE
		},
		scaleControl: true,
		mapTypeId: google.maps.MapTypeId.ROADMAP
	};
	var map = new google.maps.Map(document.getElementById(&quot;map_canvas&quot;), myOptions);

                
Any ideas what the problem could be?

![Missing controls][1]


  [1]: http://i.stack.imgur.com/WAa4n.png

Zoom control and streetview not showing on my Google map?

I want to open a new window by clicking on a marker using Google Maps API 3.

Unfortunately there are not many examples for the Google Maps API and I found out this code:
    
    google.maps.event.addListener(marker, &#39;click&#39;, function() {
        window.location.href = marker.url;
    });

How to use it, when I create markers with a loop? I tried it in many ways with no afford.

This is my code – I made it simple and short:

    &lt;!DOCTYPE html&gt;
    &lt;html&gt;
    &lt;head&gt;
        &lt;meta name=&quot;viewport&quot; content=&quot;initial-scale=1.0, user-scalable=no&quot; /&gt;

        &lt;style type=&quot;text/css&quot;&gt;
            html { height: 100% }
            body { height: 100%; margin: 0; padding: 0 }
            #map_canvas { height: 100% }
        &lt;/style&gt;

        &lt;script type=&quot;text/javascript&quot; src=&quot;http://maps.googleapis.com/maps/api/js?sensor=false&quot;&gt;&lt;/script&gt;

        &lt;script type=&quot;text/javascript&quot;&gt;
        var points = [
            [&#39;name1&#39;, 59.9362384705039, 30.19232525792222, 12],
            [&#39;name2&#39;, 59.941412822085645, 30.263564729357767, 11],
            [&#39;name3&#39;, 59.939177197629455, 30.273554411974955, 10]
        ];

        function setMarkers(map, locations) {
            var shape = {
                coord: [1, 1, 1, 20, 18, 20, 18 , 1],
                type: &#39;poly&#39;
            };

            for (var i = 0; i &lt; locations.length; i++) {
                var flag = new google.maps.MarkerImage(&#39;markers/&#39; + (i + 1) + &#39;.png&#39;,
                new google.maps.Size(17, 19),
                new google.maps.Point(0,0),
                new google.maps.Point(0, 19));

                var place = locations[i];
                var myLatLng = new google.maps.LatLng(place[1], place[2]);
                var marker = new google.maps.Marker({
                    position: myLatLng,
                    map: map,
                    icon: flag,
                    shape: shape,
                    title: place[0],
                    zIndex: place[3]
                });
            }
        }

        function initialize() {
            var myOptions = {
                center: new google.maps.LatLng(59.91823239768787, 30.243222856188822),
                zoom: 12,
                mapTypeId: google.maps.MapTypeId.ROADMAP
            };
            var map = new google.maps.Map(document.getElementById(&quot;map_canvas&quot;),myOptions);
            setMarkers(map, points);
        }
        &lt;/script&gt;
    &lt;/head&gt;

    &lt;body onload=&quot;initialize()&quot;&gt;
        &lt;div id=&quot;map_canvas&quot; style=&quot;width:50%; height:50%&quot;&gt;&lt;/div&gt;
    &lt;/body&gt;
    &lt;/html&gt;

How to open url by clicking on marker with code above?

Google Maps API: open url by clicking on marker

There is a &quot;person&quot; icon which allows user to view &quot;Street View&quot;. I don&#39;t want this functionality on my map, is there a way to remove it or disable it?

[Street View][1]


  [1]: http://code.google.com/apis/maps/documentation/javascript/streetview.html

Google Maps V3: How to disable &quot;street view&quot;?

I am using google autocomplete places javascript to return suggested results for my searchbox , what I need is to only show the city and the country related to the characters entered but google api will give a lot of general places results which I dont need , so how to limit the result to show only city and the country .

I am using the following Example:

    &lt;html&gt;
    &lt;head&gt;
    &lt;style type=&quot;text/css&quot;&gt;
       body {
             font-family: sans-serif;
             font-size: 14px;
       }
    &lt;/style&gt;

    &lt;title&gt;Google Maps JavaScript API v3 Example: Places Autocomplete&lt;/title&gt;
    &lt;script src=&quot;http://maps.googleapis.com/maps/api/js?sensor=false&amp;amp;libraries=places&quot; type=&quot;text/javascript&quot;&gt;&lt;/script&gt;
    &lt;script type=&quot;text/javascript&quot;&gt;
       function initialize() {
          var input = document.getElementById(&#39;searchTextField&#39;);
          var autocomplete = new google.maps.places.Autocomplete(input);
       }
       google.maps.event.addDomListener(window, &#39;load&#39;, initialize);
    &lt;/script&gt;

    &lt;/head&gt;
    &lt;body&gt;
       &lt;div&gt;
          &lt;input id=&quot;searchTextField&quot; type=&quot;text&quot; size=&quot;50&quot; placeholder=&quot;Enter a location&quot; autocomplete=&quot;on&quot;&gt;
       &lt;/div&gt;
    &lt;/body&gt;
    &lt;/html&gt;

How to limit google autocomplete results to City and Country only

I have a Google Maps (V3) in my page at 100% page width with one marker in the middle. When I resize my browser window&#39;s width I would like the map to stay centered (responsive). Now the map just stays at the left side of the page and gets smaller.

UPDATE
Got it to work exactly as described thanks to duncan. This is the final code:

    var center;
    function calculateCenter() {
      center = map.getCenter();
    }
    google.maps.event.addDomListener(map, &#39;idle&#39;, function() {
      calculateCenter();
    });
    google.maps.event.addDomListener(window, &#39;resize&#39;, function() {
      map.setCenter(center);
    });

Center Google Maps (V3) on browser resize (responsive)

I have scoured stackoverflow and other forums including the google maps v3 api docs for an answer but I cannot find how to change the event that fires the marker info window from *click* to *mouseover* in the files I am working with. 

I am working with a demo from the google library that includes a fusion table layer.

You zoom into the clusters and see the small red circle markers for locations.
You have to click to reveal an info window. I wish to rollover to reveal the info window.

My demo is here:
&lt;http://www.pretravelvideo.com/gmap2/&gt;

The functions.js file does most of the work here:
&lt;http://www.pretravelvideo.com/gmap2/functions.js&gt;


Content Type	Original Author	Original Content on Stackoverflow
Question	Sami Al-Subhi	View Question on Stackoverflow
Solution 1 - Javascript	ScottE	View Answer on Stackoverflow
Solution 2 - Javascript	Jasper	View Answer on Stackoverflow

disable zooming dragging in Google maps by clicking on a button

Javascript Problem Overview

Javascript Solutions

Solution 1 - Javascript

Solution 2 - Javascript

Difference between DropDownlist or DropDownListFor Html helper

iOS 5 does not allow to store downloaded data in Documents directory?

Attributions