JAVASCRIPT

jquery disable all input form

//In older versions you could use attr. 
//As of jQuery 1.6 you should use prop instead:
$("#target :input").prop("disabled", true);

//To disable all form elements inside 'target'. See :input:
//Matches all input, textarea, select and button elements.

//If you only want the <input> elements:
$("#target input").prop("disabled", true);

disable input field with jquery

// Disable #x
$( "#x" ).prop( "disabled", true );
 
// Enable #x
$( "#x" ).prop( "disabled", false );

disable input field using jquery

//jQuery 1.6+ use:
$("#inputID").prop('disabled', true); //disable 
$("#inputID").prop('disabled', false); //enable

//jQuery 1.5 and below use:
$("#inputID").attr('disabled','disabled'); //disable 
$("#inputID").removeAttr('disabled'); //enable

$( "#x" ).prop( "disabled", true );
 
// Enable #x
$( "#x" ).prop( "disabled", false );