Re: [JSMentors] Image polling through Javascript

[fernando trasvina]

use ?Math.random() on ur uri
or timestamp + Math.random()

On Dec 20, 2010, at 3:35 AM, Amit Agarwal wrote:

> Hi every one,
> 
> I need to poll an image using javascript and need to perform an action once 
> the image is found at its position. This is the code I have written for this 
> task.
> 
> /*----Image handling script starts here----*/
> var beacon = new Image(); 
> 
> 
> beacon.onload = function() {
> 
> 
>     console.log('Image found'); 
>     console.log(this.width,this.height);
> 
> 
>     window.clearInterval(timer);
> };
> 
> 
> beacon.onerror = function(){    
>    console.log('Image not found');
> 
> 
> }
> var timer = window.setInterval(function(){
> 
> 
>     console.log('sending the request again');
>     beacon.src = "http://www.google.co.in/logos/2010/lennon10-hp.gif";;
> 
> 
> },2000);
> /*----Image handling script ends here----*/
> Problem is that, after one GET request, the response gets cached and requests 
> don't get sent everytime I set src. If you examine NET tab, it sends request 
> only on first src set and caches the response.
> 
> I need to send a fresh request for image every time my code sets the src. Any 
> workarounds?
> 
> 
> -Regards
> Amit Agarwal
> +91-779-822-8765
> 
> 
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