JQuery snippets

Adding text to a span using jquery

$("#spanid").text("Your text here");

Adding html to a span using jquery

$("#spanid").text("HTML here");

Append html to a span using jquery

$("#spanid").append("HTML here");

Check/uncheck a checkbox input or radio button

$("#x").prop("checked", true);
$("#x").prop("checked", false);

Check checkbox checked property

$("#x").is(':checked')

Handle change of checkbox

$('#x').change(function() {
   if($(this).is(":checked")) {
      //'checked' event code
      return;
   }
   //'unchecked' event code
});

Make a dropdown disabled using jquery
If you work with a form, the disabled fields does not submit, so use a hidden field to store disabled dropdown value.

$('#dropdown').attr("disabled", "disabled"); 
$('#dropdown').removeAttr("disabled"); 

Get selected text from drop down list

$("#yourdropdownid option:selected").text();

increase the opacity of div

$(div).css({opacity : 0})
$(div).animate({'opacity': 1}, 1000);

$('div').fadeTo('fast', .5)

Register a handler to be called when Ajax requests complete

$( document ).ajaxComplete(function( event,request, settings ) {
  $( "#msg" ).append( "
Request Complete.
" );
});

Scroll to top

$('html,body').scrollTop(0);

Height and Width

screen.availHeight
screen.availWidth
screen.height
screen.width

Redirect page using jQuery

// similar behavior as an HTTP redirect
window.location.replace("http://stackoverflow.com");

// similar behavior as clicking on a link
window.location.href = "http://stackoverflow.com";

Check if an HTML element is empty

if ($('#element').is(':empty')){
  //do something
}

Load another page or div from another page in DIV

$( "#result" ).load( "ajax/test.html" );

$( "#result" ).load( "ajax/test.html", function() {
  alert( "Load was performed." );
});

$( "#result" ).load( "ajax/test.html #container" );