How to track changes made in a HTML form?
Description: Bind an event handler to the "change" JavaScript event, or trigger that event on an element.
This method is a shortcut for
.on( "change", handler ) in the first two variations, and .trigger( "change" ) in the third.
The
change event is sent to an element when its value changes. This event is limited to <input> elements, <textarea>boxes and <select> elements. For select boxes, checkboxes, and radio buttons, the event is fired immediately when the user makes a selection with the mouse, but for the other element types the event is deferred until the element loses focus.
For example, consider the HTML:
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>change demo</title>
<style>
div {
color: red;
}
</style>
<script src="https://code.jquery.com/jquery-1.10.2.js"></script>
</head>
<body>
<form>
<select name="sweets" multiple="multiple">
<option>Chocolate</option>
<option selected="selected">Candy</option>
<option>Taffy</option>
<option selected="selected">Caramel</option>
<option>Fudge</option>
<option>Cookie</option>
</select>
<div></div>
<div id="divChange"></div>
<input id="tb" type="text" value="umesh"></input>
</form>
<script>
$( "form" )
.change(function () {
var str = "";
$( "select option:selected" ).each(function() {
str += $( this ).text() + " ";
});
$( "div" ).text( str );
$("#divChange").text($("#tb").val());
})
.change();
</script>
</body>
</html>
For more information:
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