javascript - Why does this ExtJS code get the error "this.el is null"? -

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i want able click button , execute extjs code testing, extjs code gives me error this.el null. what have code work?

main.js:

ext.onready(function() {      var button = new ext.button('button-div', {         text: 'hello',         handler: function() {             alert('pressed');         }     });      viewport = new ext.viewport({         layout: 'border',         items: [ button ]     });      viewport.dolayout();  });

html:

<!doctype html> <html>     <head>         <link rel="stylesheet" type="text/css" href="ext/resources/css/ext-all.css">         <script type="text/javascript" src="ext/adapter/ext/ext-base.js">         </script>         <script type="text/javascript" src="ext/ext-all-debug.js">         </script>         <script type="text/javascript" src="js/main.js"></script>     </head>     <body>      </body> </html>

working code:

thanks pointer @mchl, works code:

ext.onready(function() {      var button = new ext.button({         text: "click this",         handler: function() {             alert('pressed');         }     });      var regioncontent = new ext.panel({         region: 'center',         padding:'10',         autoscroll: true,         items: [ button ]     });      viewport = new ext.viewport({         layout: 'border',         items: [ regioncontent ]     });      viewport.dolayout(); });

you're using layout: 'border' makes viewport use ext.layout.borderlayout. in documentation layout you'll find note:

  • any container using borderlayout must have child item region:'center'. child item in center region resized fill remaining space not used other regions in layout.

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