javascript - Two dimentional array in js -

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i trying 2 dimensional array in javascript, have json , trying populate 2d array. code here:

jquery.each(data.data, function(key,val){         survey_sec_id_arr.push(val.section_id);         survey_question_id_arr.push(val.section_id);         jquery.each(val, function(key1,val1){             if(key1!="section_id" && key1!="section_name"){                  survey_question_id_arr[val.section_id].push(val1.question_id);             }         }); }); console.log(survey_question_id_arr);

so here error in firebug is:

typeerror: survey_question_id_arr[val.section_id] undefined

what going wrong?

you loop not correct. add of elements via push array looks 

survey_question_id_arr = array( [0] => val.section_id, [1] => val.section_id...)

then try element of array via 

//returns undefined survey_question_id_arr[val.section_id]  //should return value val.section_id[0]

fix:

survey_question_id_arr[val.section_id].push(val1.question_id)

i think solves problem


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