How to Bind to the Change Event of a Textarea in Jquery

How can I bind to the change event of a textarea in jQuery?

Try this actually:

$('#textareaID').bind('input propertychange', function() {

      $("#yourBtnID").hide();

      if(this.value.length){
        $("#yourBtnID").show();
      }
});

DEMO

That works for any changes you make, typing, cutting, pasting.

How to capture TextArea text changed event in JQuery

You could attach the event using change() or .on(), like :

$('.barcodeInput').change(function(){
    alert("changed");
});
//Or
$('.barcodeInput').on('change', function(){
    alert("changed");
});

And you could invoke the event when you change the text :

textarea.val('new val').change();
//Or
textarea.val('new val').trigger('change');

NOTE : bind and delegate are deprecated.

Hope this helps.

$('.barcodeInput').on('change', function(){    alert("changed");});
$('.barcodeInput').val('new val').change();

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script><textarea class='barcodeInput'></textarea>

Trigger change event on textarea in jquery

Set a value per script does not trigger a change event.
If you need the event you must manually trigger it.

$("#but").bind("click",function(){
    $("#inptxt").val("Jquery").trigger('change');
});

jsfiddle

Update text on textarea value change w/ jQuery

$(document).ready(function(){
    function myFunc(){
        var input = $("#myTxt").val();
        $("#txtHere").text(input);
    }       
    myFunc();

    //either this
    $('#myTxt').keyup(function(){
        $('#txtHere').html($(this).val());
    });

    //or this
    $('#myTxt').keyup(function(){
        myFunc();
    });

    //and this for good measure
    $('#myTxt').change(function(){
        myFunc(); //or direct assignment $('#txtHere').html($(this).val());
    });
});

Why on change event for TextArea not firing in my ASP.net page

Bind on input propertychange instead. This will alert on every change. The change event will fire only when leaving the textarea.

$(function () {
    $("body").on('input propertychange', "#ContentMain_taskNotes", function (e) {
        alert("changing");
    });
});

JSFiddle.

What event does jQuery fire when using append on a textarea?

Using trigger function after append will help

$(document).on('click', '#myBtn', function(e) {    $('#log-box__data').append('someText' + '\n');  $('#log-box__data').trigger("change");  });
$('#log-box__data').on('change', function(e) {  alert( "foobar" );});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script><textarea id="log-box__data"></textarea><br /><button id="myBtn">add text</button>

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