var myJSON = {
"list1" : [ "1", "2" ],
"list2" : [ "a", "b" ],
"list3" : [ { "key1" : "value1" }, { "key2" : "value2" } ],
"not_a_list" : "11"
};
How do I dynamically build this JSON structure in javascript? Google tells me to use use some push command, but I've only found specific cases. So what do I write to enter data to "listX" and "not_a_list". Appending as well as creating a new list. The whole procedure begninning with:
var myJSON = {};
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First, I think you're calling it the wrong thing. "JSON" stands for "JavaScript Object Notation" - it's just a specification for representing some data in a string that explicitly mimics JavaScript object (and array, string, number and boolean) literals. You're trying to build up a JavaScript object dynamically - so the word you're looking for is "object".
With that pedantry out of the way, I think that you're asking how to set object and array properties.
// make an empty object
var myObject = {};
// set the "list1" property to an array of strings
myObject.list1 = ['1', '2'];
// you can also access properties by string
myObject['list2'] = [];
// accessing arrays is the same, but the keys are numbers
myObject.list2[0] = 'a';
myObject['list2'][1] = 'b';
myObject.list3 = [];
// instead of placing properties at specific indices, you
// can push them on to the end
myObject.list3.push({});
// or unshift them on to the beginning
myObject.list3.unshift({});
myObject.list3[0]['key1'] = 'value1';
myObject.list3[1]['key2'] = 'value2';
myObject.not_a_list = '11';
That code will build up the object that you specified in your question (except that I call it myObject instead of myJSON). For more information on accessing properties, I recommend the Mozilla JavaScript Guide and the book JavaScript: The Good Parts.
As myJSON is an object you can just set its properties, for example:
myJSON.list1 = ["1","2"];
If you dont know the name of the properties, you have to use the array access syntax:
myJSON['list'+listnum] = ["1","2"];
If you want to add an element to one of the properties, you can do;
myJSON.list1.push("3");
Source: Stackoverflow.com