android - unable to call onclick event only at first page in phonegap -

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i'm using cordova phonegap make android app. in first page i'm trying use input elements button:

$(document).ready(init());

and:

document.addeventlistener("deviceready", ondeviceready, false);

input element:

<input type="button" id="task_btn" value="button" />

click event:

$("#download_btn").click(function() {       console.log("index.html >> task button clicked"); }

but doesn't work; however, in second page works well.
element ids defined correctlly.

how solve problem?

full code on html page :

    <!doctype html>  <html>     <head>         <title>home page</title>         <meta charset="utf-8">         <link rel="stylesheet" href="js/jquery.mobile-1.3.1.min.css">         <script src="js/jquery-1.9.1.min.js"></script>         <script src="js/jquery.mobile-1.3.1.min.js"></script>         <script src="js/cordova.js"></script>         <style type="text/css">             .main {                 margin:0 auto;                 width:100%;                 height: 100%;             }             .button_main {                 margin-left:1%;                 width:20%;                 height: 20%;                 padding-top: 3%;                 padding-bottom: 3%;                 background-color: #fbe26f;                 float: left;             }             .button_right {                 margin-left: 8.75%;                 margin-right: 8.75%;                 width:20%;                 height: 20%;                 padding-top: 3%;                 padding-bottom: 3%;                 background-color: #fbe26f;                 float: left;             }             .p_tag {             margin-left: auto;             margin-top: 5%;             margin-right: auto;             text-align: right;             color: #194b7e;             width:90%;             font: italic bold 25px/30px georgia, serif;             background-color: #d0d0d0;             word-wrap: break-word;         }     </style> </head> <body>     <div class="main" align="center">         <div id="button_keeper" align="center">             <input type="button" id="contact_btn" value="contact us" />             <input type="button" id="product_btn" value="product" />             <input type="button" id="about_btn" value="about us" />             <!--<a href="view.html?status=1" rel="external"><div id="contact_btn" class="button_main">contact us</div></a>-->             <!--<a href="view.html?status=2" rel="external"><div id="product_btn" class="button_main">product</div></a>-->             <!--<a href="view.html?status=3" rel="external"><div id="about_btn" class="button_main">about us</div></a>-->         </div>         <p id="message" class="p_tag"></p>     </div>     <script type="text/javascript">         $( document ).ready(function() { //                $('#message').append('device ready use');             document.addeventlistener("deviceready", ondeviceready, false);         });         function ondeviceready() { //                $('#message').append('<br />'+'device ready use');         }         $("#contact_btn").click(function() {             console.log("index.html >> button clicked : ");             $('#message').append('contact button clicked');         });         $("#about_btn").click(function() {             console.log("index.html >> button clicked : ");             $('#message').append('about button clicked');         });         $("#product_btn").click(function() {             console.log("index.html >> button clicked : ");             $('#message').append('products button clicked');         });     </script> </body>

i solved input buttons changed :

            <input type="button" id="contact_btn" value="contact us" onclick="contactclicked()" />             <input type="button" id="product_btn" value="product" onclick="contactclicked()"/>             <input type="button" id="about_btn" value="about us" onclick="contactclicked()"/>

and functions :

        function contactclicked() {             console.log("index.html >> button clicked .");             $('#message').html('contact button clicked');         }         function productclicked() {             console.log("index.html >> button clicked : ");             $('#message').html('products button clicked');         }         function aboutclicked() {             console.log("index.html >> button clicked : ");             $('#message').html('about button clicked');         }

thank answers.


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