Примеры для jQuery.when()

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Execute a function after two Ajax requests are successful. (See the jQuery.ajax() documentation for a complete description of success and error cases for an ajax request).

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$.when( $.ajax( "/page1.php" ), $.ajax( "/page2.php" ) ).done(function( a1, a2 ) {
  // a1 and a2 are arguments resolved for the page1 and page2 ajax requests, respectively.
  // Each argument is an array with the following structure: [ data, statusText, jqXHR ]
  var data = a1[ 0 ] + a2[ 0 ]; // a1[ 0 ] = "Whip", a2[ 0 ] = " It"
  if ( /Whip It/.test( data ) ) {
    alert( "We got what we came for!" );
  }
});

Execute the function myFunc when both ajax requests are successful, or myFailure if either one has an error.

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$.when( $.ajax( "/page1.php" ), $.ajax( "/page2.php" ) )
  .then( myFunc, myFailure );