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sunflower
Asked: 2020-04-08 09:28:54 +0800 CST 2020-04-08 09:28:54 +0800 CST

How to enable a textbox in jquery? [closed]

  • 772

what I need is that a textbox is disabled and it is enabled until I write 4 numbers in a previous textbox. The textboxes are asp:Textbox. The truth is that I haven't tried it because I don't know how, and it occurs to me that it could be with jquery or from behind code c#. Thank you for reading.

c#

1 Answers

  1. Best Answer

    For this I would use the keyup event

    jQuery keyup() Method Documentation

    I hope it helps you

    $("#txt1").keyup(function() {
  var _this = $(this);
  if (_this.val().length >= 4) {
    $('#txt2').removeAttr("disabled");
  }else{
    $('#txt2').attr("disabled", "disabled");
  }
});
    input[disabled] {
  background-color: #eee;
  cursor: not-allowed;
}
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="textbox" id="txt1" placeholder="Escribe ...">
<input type="textbox" id="txt2" disabled>

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