JavaScript HElps

Js

                        Interesting  Jquery 
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//Añadir elementos a un select 
 $('#mySelect')
         .append($("<option></option>")
                    .attr("value",key)
                    .text(value)); 
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selection tag select for select value
 example : $('#species select option[value="' +  + '"]').prop('selected',true);
     $('#words').val("{{$card_word->id_wd}}").change();
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AJAX jquery charge call ajax example 
http://stackoverflow.com/questions/3709597/wait-until-all-jquery-ajax-requests-are-done
$.when(ajax1(), ajax2(), ajax3(), ajax4()).done(function(a1, a2, a3, a4){
    // the code here will be executed when all four ajax requests resolve.
    // a1, a2, a3 and a4 are lists of length 3 containing the response text,
    // status, and jqXHR object for each of the four ajax calls respectively.
});

function ajax1() {
    // NOTE:  This function must return the value 
    //        from calling the $.ajax() method.
    return $.ajax({
        url: "someUrl",
        dataType: "json",
        data:  yourJsonData,            
        ...
    });
}
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