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Editorial Team
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Asked: 2026-05-13T11:18:02+00:00

I am trying to get it so that when a certain value is put

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I am trying to get it so that when a certain value is put into a textbox, the focus will stay on the textbox(and an alert will be shown in production). I am trying to get this to work in Firefox 3.5.7 with no luck.

How can I make it so when a textbox is a certain value at onchange that it will stay focused/refocus on the textbox?

Live example is at http://jsbin.com/ipina

<body>
Enter your name: <input type="text" name="fname" id="fname" onchange="
  if(this.value=='foo'){
    this.select();
    this.focus();
  }
  "  />
</body>

Also, I don’t get any javascript errors or warnings in the Error Console on executing this code.

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1 Answer

  1. Editorial Team

    According to Javascript onchange different in IE and FireFox I needed to set the focus after the onchange event occurs, so I had to end up with something like this:

    Enter your name: <input type="text" name="fname" id="fname" onblur="
  if(this.value=='foo'){
    alert('bah');
    setTimeout('document.getElementById(\'fname\').focus();document.getElementById(\'fname\').select();',0);
  }
  "  />

    And also I had to catch it when the focus was lost, not necessarily when the text was changed, so I had to use onblur instead of onchange.

    Live: http://jsbin.com/ofeva

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