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PODynamically refreshing an image using ajax within Grails
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  1. PODynamically refreshing an image using ajax within Grails
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    copied!<p>I have a web page where I need periodically update image based on several conditions. For now I'm using this:</p> <pre><code> &lt;html&gt; &lt;head&gt; &lt;meta http-equiv="refresh" content="3"&gt; &lt;/head&gt; &lt;body&gt; &lt;img src="${createLink(controller:'advertisment',action:'viewImage',id:advertismentInstance.id)}"/&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>But it causes total reload of the web page, so I want it to be done with Ajax (I'm also using Prototype framework which is default in Grails).</p> <p>Provide with advertisment controller method:</p> <pre><code> def viewImage = { log.info("before view Image") def adv = Advertisment.get(params.id) byte[] image = adv.fileContent response.outputStream &lt;&lt; image log.info("after view Image") } </code></pre> <p>device controller method:</p> <pre><code>def showAdv = { log.info("showAdv start") def deviceInstance = Device.get(params.id) int totalNumberOfAdv = deviceInstance.advertisment.size(); Random rand = new Random() int advToShow = rand.nextInt(totalNumberOfAdv+1) - 1; def advertismentInstance = deviceInstance.advertisment.toArray()[advToShow] if(advertismentInstance) { render(view: "image", model: [deviceInstance :deviceInstance,advertismentInstance: advertismentInstance]) } else { flash.message = "${message(code: 'default.not.found.message', args: [message(code: 'advertisment.label', default: 'Advertisment'), params.id])}" } log.info("showAdv end") } </code></pre>
 

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