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Editorial Team
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Asked: 2026-06-06T04:56:39+00:00

I am runing the following jquery script: <html> <head> <script type=text/javascript src=jquery.js></script> <script type=text/javascript>

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I am runing the following jquery script:

<html>
<head>

<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript">
$(document).ready(function(){
  $("#textThing").blur(function(){
    var isNumber = $("#textThing").val().match(/^\d+/);

    $("#p2").html(isNumber);
  });
});

</script>

</head>

<body>
<input type="text" id="textThing" />
<p id="p2">Paragraph 2</p>
</body>
</html>

The problem is that the p2 never gives me anything when I deselect the input. What did I do wrong?

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1 Answer

  1. Editorial Team

    You need to say:

    $("#p2").html(isNumber == null ? "" : isNumber[0]);

    instead of:

    $("#p2").html(isNumber);

    …because .match() returns an array if matched. See here: https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/String/match

    Here’s a working version: http://jsfiddle.net/k45Ka/5/

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