javascript - How can I get an array element out of an array in the value of a form element? -

i have html form element value set array. want 1 of these values out of array via jquery. how done? here code. maybe can speak if explanation wasn't clear. thank you!

    var lat = 0;     var long = 0;      //gets latitude , longitude when user clicks on place on map      map.on('click', function(e) {         lat = e.latlng.lat;         long = e.latlng.lng;      //store lat , long in array          var latlong = [lat, long];      //here setting value of element in form array of lat , long          document.getelement(".<?= $this->getname() ?>").set("value", latlong);         var getlatlong = jquery(".<?= $this->getname() ?>").val();         console.log("retrieved: " + getlatlong);      //it saves , retrieves properly.      //the problem here     //the problem here       var lat = $(".<?= $this->getname() ?>").val()[0];       var long = $(".<?= $this->getname() ?>").val()[1];     //the problem here     //the problem here       }); 

this runs fine not reuslt want. if try using of lines of code below

    //the problem here       var lat = $(".<?= $this->getname() ?>").val()[0];    //returns 9       var long = $(".<?= $this->getname() ?>").val()[1];   //returns 4       var long = $(".<?= $this->getname() ?>").val()[3];   //returns 2       var long = $(".<?= $this->getname() ?>").val()[4];   //returns 3     //the problem here 

to either latitude or longitude "ie: 94.2323, 12.9932"

the index [0] returns 9, index [1] returns 4, index [3] returns 2 

as if 94.2323 array instead of lat , long array. want [0] return 94.2323, , [1] return 12.9932.

i tried explaining , formatting question best could. thank you.

you can use json.stringify() convert array json format

document.getelement(".<?= $this->getname() ?>") .set("value", json.stringify(latlong)); 

json.parse() convert json formatted string array

var getlatlong = json.parse(jquery(".<?= $this->getname() ?>").val()); console.log(getlatlong[0], getlatlong[1]); // stuff