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POHow to increment/decrements viewport meta values(initial scale, max scale or min scale) on every button click?
 

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  1. POHow to increment/decrements viewport meta values(initial scale, max scale or min scale) on every button click?
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    <p>Im developing phonegap app in that I have used meta tag values through Javascript , I need a requirement to change meta tag values(initial scale, max scale or min scale) on button clicks. Its changing only one times after that does not work(change). I am running it in Android 4.0.4 devices and using Phonegap 2.9.0 Below is my Javascript code</p> <pre><code>$(document).ready(function() { alert("Onload"); }); var scale = 1.0; function zoomIn(){ scale++; if (screen.width &lt; 500) { $('#meta-viewport').attr('content', 'width=device-width, initial-scale=' + scale + ', maximum-scale=' + scale + ', minimum-scale=' + scale + ', user-scalable=yes'); } } function zoomOut() { scale--; if (screen.width &lt; 500) { $('#meta-viewport').attr('content', 'width=device-width, initial-scale=' + scale + ', maximum-scale=' + scale + ', minimum-scale=' + scale + ', user-scalable=yes'); } } </code></pre> <p>Below is my html code</p> <pre><code>&lt;!DOCTYPE html&gt; &lt;html&gt; &lt;head&gt; &lt;meta charset="utf-8" /&gt; &lt;meta name="viewport" content="user-scalable=yes, initial-scale=1.0, maximum scale=1.0, minimum-scale=1.0,width=device-width, height=device-height,target-densitydpi=devicedpi" /&gt; &lt;script type="text/javascript" src="js/jquery_v1.9.1.js"&gt;&lt;/script&gt; &lt;/head&gt; &lt;body&gt; &lt;img id="background" src="img/bgImg.png" style="position: absolute; z-index:-1;" /&gt; &lt;img id="carImg1" src="img/up.png" style="position: absolute; left: 150px; top: 100px; z-index:1;" /&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>Please anybody help me to get resolve this..What am I doing wrong?</p>
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