How to Detect a Textbox's Content Has Changed

How to detect a textbox's content has changed

Start observing 'input' event instead of 'change'.

jQuery('#some_text_box').on('input', function() {
    // do your stuff
});

...which is nice and clean, but may be extended further to:

jQuery('#some_text_box').on('input propertychange paste', function() {
    // do your stuff
});

Detect a textbox's content has changed after date selection

I think this is what you are looking for

$('#' + CalenderId).datepicker({
    onSelect: 
    }
});

You will need to add your function to the on select property

check textbox's content has changed

You can use onchange event like this:

var ttime = document.getElementById('txtTime');
var tdate = document.getElementById('txtDate');
var tdt = document.getElementById('txtDateTime');

ttime.onchange = function(){
  tdt.value = tdate.value + ttime.value;
};

tdate.onchange = function(){
  tdt.value = tdate.value + ttime.value;
};

Make sure to assign id attribute to your text boxes eg txtTime, txtDate and txtDateTime

Detect changed input text box

You can use the input Javascript event in jQuery like this:

$('#inputDatabaseName').on('input',function(e){
    alert('Changed!')
});

In pure JavaScript:

document.querySelector("input").addEventListener("change",function () {
  alert("Input Changed");
})

Or like this:

<input id="inputDatabaseName" onchange="youFunction();"
onkeyup="this.onchange();" onpaste="this.onchange();" oninput="this.onchange();"/>

WinForms C++ How to detect that text has changed since it was saved last time?

Firstly I've set up the variable:

private: bool TextChanged = false;

By clicking on the Textbox and Properties we can find a TextChanged event. Clicking twice we're adding a code to our .h file and then we should mark what should happen when the text is changing, in this case:

private: System::Void tresc_TextChanged(System::Object^  sender, 
    System::EventArgs^  e) 
        {
            TextChanged = true;
        }

At the end, I added

TextChanged = false;

in every single method where I needed to, like i.e. saving or opening a new file.

See what changed inside TextArea with on change listener

Consider that what you have in string a1 is the constant text and that what you have in string a2 is where you make changes.

let's just say that the value in a1 is "test";

Try this for your JavaScript:

var constValue = $('#a1').val();
$('#a2').change(function() {
    var changingValue = $('a2').val();                   // say the value entered is "testing"
    console.log(changingValue.replace(constValue, '');   // gives you "ing"
}

This will give you the changed/entered (newly) value in string a2 and log it to your console.

The logic you use here is simple:

Read the value from string a2 and use the value in a1 to replace (if exists) in string a2, hence giving you the changed value. You need not use any libraries for this. JavaScript gives you this function called replace.

Do let me know if any more queries.

jquery detect textbox value change NOT based on user input

There is no such event supported. The only thing you can try is to set interval or timeout to check if the value was changed (using data to store temporary value):

var $myText = $("#myText");

$myText.data("value", $myText.val());

setInterval(function() {
    var data = $myText.data("value"),
        val = $myText.val();

    if (data !== val) {
        $myText.data("value", val);
        alert("changed");
    }
}, 100);

DEMO: http://jsfiddle.net/xZcAr/1/

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