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hello friends in this video tutorial we are going to learn dynamic dependent select box by using query Ajax with JSON data in one of our previous video tutorial in which we have already made discussion on how to create dynamic dependent drop-down list in PHP in which we have used Ajax for load data under next select box from MySQL database using PHP script so this type of dynamic dependent drop-down we have already made but here we have do something different here we have stored data in JSON array file and by using ajax query we will load dynamic data and different select box as per requirement here we will not write any service script for fetching data from database but we will use Ajax for fetch data from JSON file so it will be very light on server and it will do all operation as client-side in their website execution speed will be increased for discuss this topic we have used country state city example to describe topic like how to make dynamic dependent drop-down list by using ajax query here when we have select country then in next select box that will load state data and when we have select state name then in next select box that will load city data now let's start learning this topic this is our simple JSON file which we have store under our working folder in this JSON file there is an array of data in which we have stored country state and city data in this file array there is three key like head name and parented and at key we have story unique kid of array in name we have store name of country state and city and in parented key we have store it of parent array here you can see in first or a parent it is 0 and did is 1 a name as USA here parent at 0 means it is country name same way here and for array its parent it as one wishes and it of USA that means it is state of USA and lastly and at 11 array name is New York City and parent it is for this is an eighth of New York which is state of USA and it is city of New York State so this way we have made data structure for make dynamic dependent select box now we have moved to write HTML code on our index file on this file we have already include JavaScript libraries query file and bootstrap framework file on this page we will use functionality of both library after this we have right select tag with name is equal to country it is equal to country and under the Select tag we have defined on option tag with value is equal blank and in text we have right select country under this we will load country named with the read then after we have a gain right select...