jquery - undefined value for empty database record -

what best solution undefined values being returned database when column empty. there way having

if (!(databasevalue == 'undefined') || !(databasevalue == null)) {      console.log(databasevalue)  } else {      console.log('value empty')   } 

this ok if few values can empty if multiple values can empty check each value if undefined or not show result

update

$.ajax({     type: 'post',     url: 'php',     datatype: "json",     data: {         id: "id"     },     success: function (data) {         //check data undefined or not     },     error: function (data) {         console.log(data);     }   }); 

is there collective checking see data response undefined or need check each have if condition check if data empty or not

you need use && operator instead of || , undefined should not in quotes

if (!(databasevalue == undefined) && !(databasevalue == null)) {     console.log(databasevalue) } else {     console.log('value empty'); } 

however simplest solution should check truthy condition, following condition check databasevalu has value

if (databasevalu) { //!!databasevalu     console.log(databasevalue) } else {     console.log('value empty'); } 

!! double-negation used conversion of condition boolean instead of truthy