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<html><head><script class="jsbin" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script><meta charset=utf-8 /><title></title></head><body> <script> String.prototype.trim = function() { return this.replace(/^\s+|\s+$/g,""); } function test_field(){ if(document.getElementById("field").value.trim() == ''){ alert("1"); document.getElementById("field").style.display ="2"; }else{ alert("3"); } } </script> <textarea id="field">a</textarea> <input type="button" onclick="test_field()"></body></html>
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