How to create json by JavaScript for loop? - javascript

I have array of select tag.
<select id='uniqueID' name="status">
<option value="1">Present</option>
<option value="2">Absent</option>
</select>
and I want to create a json object having two fields 'uniqueIDofSelect and optionValue' in JavaScript.
I use getElementsByName("status") and I iterate on it.
EDIT
I need out put like
[{"selectID":2,"OptionValue":"2"},
{"selectID":4,"optionvalue":"1"}]
and so on...


From what I understand of your request, this should work:
<script>
// var status = document.getElementsByID("uniqueID"); // this works too
var status = document.getElementsByName("status")[0];
var jsonArr = [];
for (var i = 0; i < status.options.length; i++) {
jsonArr.push({
id: status.options[i].text,
optionValue: status.options[i].value
});
}
</script>


var sels = //Here is your array of SELECTs
var json = { };
for(var i = 0, l = sels.length; i < l; i++) {
json[sels[i].id] = sels[i].value;
}


If you want a single JavaScript object such as the following:
{ uniqueIDofSelect: "uniqueID", optionValue: "2" }
(where option 2, "Absent", is the current selection)
then the following code should produce it:
var jsObj = null;
var status = document.getElementsByName("status")[0];
for (i = 0, i < status.options.length, ++i) {
if (options[i].selected ) {
jsObj = { uniqueIDofSelect: status.id, optionValue: options[i].value };
break;
}
}
If you want an array of all such objects (not just the selected one), use michael's code but swap out status.options[i].text for status.id.
If you want a string that contains a JSON representation of the selected object, use this instead:
var jsonStr = "";
var status = document.getElementsByName("status")[0];
for (i = 0, i < status.options.length, ++i) {
if (options[i].selected ) {
jsonStr = '{ '
+ '"uniqueIDofSelect" : '
+ '"' + status.id + '"'
+ ", "
+ '"optionValue" : '
+ '"'+ options[i].value + '"'
+ ' }';
break;
}
}


If I want to create JavaScript Object from string generated by for loop then I would JSON to Object approach. I would generate JSON string by iterating for loop and then use any popular JavaScript Framework to evaluate JSON to Object.
I have used Prototype JavaScript Framework. I have two array with keys and values. I iterate through for loop and generate valid JSON string. I use evalJSON() function to convert JSON string to JavaScript object.
Here is example code. Tryout on your FireBug Console
var key = ["color", "size", "fabric"];
var value = ["Black", "XL", "Cotton"];
var json = "{ ";
for(var i = 0; i < key.length; i++) {
(i + 1) == key.length ? json += "\"" + key[i] + "\" : \"" + value[i] + "\"" : json += "\"" + key[i] + "\" : \"" + value[i] + "\",";
}
json += " }";
var obj = json.evalJSON(true);
console.log(obj);


Your question is pretty hard to decode, but I'll try taking a stab at it.
You say:
I want to create a json object having two fields
uniqueIDofSelect and optionValue in javascript.
And then you say:
I need output like
[{"selectID":2,"optionValue":"2"},
{"selectID":4,"optionvalue":"1"}]
Well, this example output doesn't have the field named uniqueIDofSelect, it only has optionValue.
Anyway, you are asking for array of objects...
Then in the comment to michaels answer you say:
It creates json object array. but I need only one json object.
So you don't want an array of objects?
What do you want then?
Please make up your mind.

Related

How to set sequence for exact consecutive elements of csv string?

I have a string csv containing PORTCODE and latitude longitude of location. I use these values to plot the marker on google map.
Eg csv string:
ANC|61.2181:149.9003,
ANC|61.2181:149.9003,
TLK|62.3209:150.1066,
DNL|63.1148:151.1926,
DNL|63.1148:151.1926,
DNL|63.1148:151.1926,
TLK|62.3209:150.1066,
TLK|62.3209:150.1066,
ALE|60.9543:149.1599
i want to autonumber SIMILAR PORTCODE sequence separated with pipe symbol '|' for the PORTCODE which are EXACT Consecutive next element.
Required out put:
ANC|61.2181:149.9003:1|2,
TLK|62.3209:150.1066:3,
DNL|63.1148:151.1926:4|5|6,
TLK|62.3209:150.1066:7|8,
ALE|60.9543:149.1599:9
Any solution using jquery/javascript/c# ?

There's probably a neater/shorter way to do this, but here's the first second way that came to mind using JavaScript:
var input = "ANC|61.2181:149.9003,\nANC|61.2181:149.9003,\nTLK|62.3209:150.1066,\nDNL|63.1148:151.1926,\nDNL|63.1148:151.1926,\nDNL|63.1148:151.1926,\nTLK|62.3209:150.1066,\nTLK|62.3209:150.1066,\nALE|60.9543:149.1599";
var output = input.split(",\n").reduce(function(p,c,i,a) {
if (i === 1) p += ":1";
return p + (c === a[i-1] ? "|" : ",\n" + c + ":") + (i+1);
});
console.log(output);
I've assumed each line ends with a single \n character, but obviously you can adjust for \r or whatever.
Further reading:
the string .split() method
the array .reduce() method

You can make something like that.
var csv = 'ANC|61.2181:149.9003,\nANC|61.2181:149.9003,\nTLK|62.3209:150.1066,\nDNL|63.1148:151.1926,\nDNL|63.1148:151.1926,\nDNL|63.1148:151.1926,\nTLK|62.3209:150.1066,\nTLK|62.3209:150.1066,\nALE|60.9543:149.1599'.split(',\n');
//count entry :
var results = [];
var j = -1;
var previous = "";
for (i = 0; i < csv.length; i++) {
if (previous === csv[i]) {
results [j] += '|' + (i+1);
} else {
j += 1;
previous = csv[i];
results [j] = csv[i] + ':' + (i+1);
}
}
//And reforme your csv
console.log(results.join(',\n'));
Further reading:
the string .split() method
the array .join() method

here is C# way to do,
public string[] data = { "ANC|61.2181:149.9003", "ANC|61.2181:149.9003", "TLK|62.3209:150.1066", "DNL|63.1148:151.1926", "DNL|63.1148:151.1926", "TLK|62.3209:150.1066", "TLK|62.3209:150.1066", "ALE|60.9543:149.1599", "DNL|63.1148:151.1926" };
int counter = 0;
var output = data.Select(x => new Tuple<string, int>(x, counter++))
.GroupBy(x => x.Item1)
.Select(h => h.Key + ":"+ string.Join("|", h.Select(x => x.Item2)));
output would be ANC|61.2181:149.9003:0|1,TLK|62.3209:150.1066:2|5|6,DNL|63.1148:151.1926:3|4|8,ALE|60.9543:149.1599:7

Can't get objects inside of array

I have been trying to use JavaScript array to push my object by header
like this :
var tab_temp = new Y.TabView(
{ srcNode: '#' + tabId }
);
tabsArray['"' + type + "_" + subTypes + '"'] = tab_temp;
Let's type = "x" and subTypes = "y", so I was expecting the object when I write something like:
tabs["x_y"]
But there is problem with this. When I debug, I can see this array will hold an object "x_y" but length of the array is 0
I can't use push also because in that way I need to use index to get it back but it is tough since sequence might change.
Edit 1:
I am using this because I want to hold a couple of TabView objects. Otherwise I can't reach those object after they created. (AlloyUI). I was able to push those object inside of array. As you see "Baru_BARANG" include and object that start with: s
Edit 2:
Thanks for help, I fixed it. I used Object instead of Array for this:
var tabs = {}
tabs[x + "_" + y] = "z";
I get the value by tabs[x + "_" + y]

You really need to be reading more about working with objects in JavaScript.
Try here first.
var type = "x";
var subType = "y";
var tabsArray = {};
tabsArray[type + "_" + subType] = "z";
console.log("tabsArray = ");
console.log(tabsArray);
console.log("tabsArray['x_y'] = " + tabsArray["x_y"]); // output: z
// Including code added to question as a comment:
var tabsArray = [];
var x = "x";
var y = "y";
tabsArray[x + "_" + y] = "z";
console.log("tabsArray['x_y'] = " + tabsArray["x_y"]);
// tabsArray.length will still be 0. To set .length you can use:
for (var i = 0; i < tabsArray.length; i++) {
tabsArray.length = ++i;
};
console.log("tabsArray.length = " + tabsArray.length);

You are most likely instantiating tabsArray as an array, i.e. var tabsArray = [];. This results in the observed behavior.
Since you want to define the keys yourself, you should instantiate it as an object instead:
var tabsArray = {};
tabsArray['x_y'] = 'z';
More about working with objects in JavaScript.

Pull information from a data file?

I have over 170000 entries of data in data file in this format:
1479661:-1,1,-1,-898,-769,0.00;-1,2,-1,-96,-1402,0.00;-1,3,-1,117,-1397,0.00;-1,4,-1,-4,-2420,0.00;4,5,-1,5570,4395,0.00;4,6,-1,5570,4395,0.00;4,7,-1,5570,4395,0.00;4,8,-1,5570,4395,0.00;4,9,-1,5570,4395,0.00;4,10,-1,5570,4395,0.00;4,11,-1,5570,4395,0.00;4,12,-1,5570,4395,0.00;4,13,-1,5570,4395,0.00;4,14,-1,5570,4395,0.00;-1,15,-1,913,-3533,0.00;4,16,-1,5570,4395,0.00;4,17,-1,5570,4395,0.00;4,18,-1,5570,4395,0.00;4,19,-1,5570,4395,0.00;4,20,-1,5570,4395,0.00;4,21,-1,5570,4395,0.00;4,22,-1,5570,4395,0.00;4,23,-1,5570,4395,0.00;4,24,-1,5570,4395,0.00;4,25,-1,5570,4395,0.00;4,26,-1,5570,4395,0.00;4,27,-1,5570,4395,0.00;4,28,-1,5570,4395,0.00;4,29,-1,5570,4395,0.00;:117,-1397,7,7.00,A,Dead;:
1479662:-1,1,-1,-898,-769,0.00;-1,2,-1,-96,-1402,0.00;-1,3,-1,117,-1392,0.00;-1,4,-1,-6,-2419,0.00;4,5,-1,5570,4395,0.00;4,6,-1,5570,4395,0.00;4,7,-1,5570,4395,0.00;4,8,-1,5570,4395,0.00;4,9,-1,5570,4395,0.00;4,10,-1,5570,4395,0.00;4,11,-1,5570,4395,0.00;4,12,-1,5570,4395,0.00;4,13,-1,5570,4395,0.00;4,14,-1,5570,4395,0.00;-1,15,-1,913,-3533,0.00;4,16,-1,5570,4395,0.00;4,17,-1,5570,4395,0.00;4,18,-1,5570,4395,0.00;4,19,-1,5570,4395,0.00;4,20,-1,5570,4395,0.00;4,21,-1,5570,4395,0.00;4,22,-1,5570,4395,0.00;4,23,-1,5570,4395,0.00;4,24,-1,5570,4395,0.00;4,25,-1,5570,4395,0.00;4,26,-1,5570,4395,0.00;4,27,-1,5570,4395,0.00;4,28,-1,5570,4395,0.00;4,29,-1,5570,4395,0.00;:117,-1392,7,7.07,A,Dead;:
Now each data array starts with a unique id and i was wondering is there a convenient way to push each entry 1479661 then 1479662 every second to an array and assign the values within the unique id into 6 fields that update.
Now I ask if there is a more convenient way as currently I am using this method:
Data comprises of three chunks in a single line
Split the link into chunks
var chunkOne = [1479661];
var chunkTwo = [-1,1,-1,-898,-769,0.00,-1,2,-1,-96,-1402,0.00,-1,3,-1,117,-1397,0.00,-1,4,-1,-4,-2420,0.00,4,5,-1,5570,4395,0.00,4,6,-1,5570,4395,0.00,4,7,-1,5570,4395,0.00,4,8,-1,5570,4395,0.00,4,9,-1,5570,4395,0.00,4,10,-1,5570,4395,0.00,4,11,-1,5570,4395,0.00,4,12,-1,5570,4395,0.00,4,13,-1,5570,4395,0.00,4,14,-1,5570,4395,0.00,-1,15,-1,913,-3533,0.00,4,16,-1,5570,4395,0.00,4,17,-1,5570,4395,0.00,4,18,-1,5570,4395,0.00,4,19,-1,5570,4395,0.00,4,20,-1,5570,4395,0.00,4,21,-1,5570,4395,0.00,4,22,-1,5570,4395,0.00,4,23,-1,5570,4395,0.00,4,24,-1,5570,4395,0.00,4,25,-1,5570,4395,0.00,4,26,-1,5570,4395,0.00,4,27,-1,5570,4395,0.00,4,28,-1,5570,4395,0.00,4,29,-1,5570,4395,0.00];
var chunkThree = [117,-1397,7,7.00,"A","Dead"];
Then get length of each array:
var chunkOneLength = chunkOne.length;
var chunkTwoLength = chunkTwo.length;
var chunkThreeLength = chunkThree.length;
Pick out the nth value in the array depending on the data chunk:
//uniqueID set as first
for (var i = 0; i < chunkOneLength; i = i + 1) {
// useful code would go here
alert("This is the unique ID " + chunkOne[i]);
}
//teamval
for (var i = 0; i < chunkTwoLength; i = i + 6) {
// useful code would go here
alert("This is the teamVal " + chunkTwo[i]);
}
Now the only problem I see with this method, is that the original data array will need to be formatted and separated into chunks every time.

As you have a separator on each section i.e. : you can actually use split to split them up like below and push them into a array and only have to do 2 loops - firstly pushing the split data in a new array and then looping through them and populating the structure.
Please note as long as each chunk of data is separated with : this will work with anything even if you expand the data later. obviously it will not work if you remove the : separator.
example below:
var splitChucks = [];
var chucks = [ "1479661:-1,1,-1,-898,-769,0.00;-1,2,-1,-96,-1402,0.00;-1,3,-1,117,-1397,0.00;-1,4,-1,-4,-2420,0.00;4,5,-1,5570,4395,0.00;4,6,-1,5570,4395,0.00;4,7,-1,5570,4395,0.00;4,8,-1,5570,4395,0.00;4,9,-1,5570,4395,0.00;4,10,-1,5570,4395,0.00;4,11,-1,5570,4395,0.00;4,12,-1,5570,4395,0.00;4,13,-1,5570,4395,0.00;4,14,-1,5570,4395,0.00;-1,15,-1,913,-3533,0.00;4,16,-1,5570,4395,0.00;4,17,-1,5570,4395,0.00;4,18,-1,5570,4395,0.00;4,19,-1,5570,4395,0.00;4,20,-1,5570,4395,0.00;4,21,-1,5570,4395,0.00;4,22,-1,5570,4395,0.00;4,23,-1,5570,4395,0.00;4,24,-1,5570,4395,0.00;4,25,-1,5570,4395,0.00;4,26,-1,5570,4395,0.00;4,27,-1,5570,4395,0.00;4,28,-1,5570,4395,0.00;4,29,-1,5570,4395,0.00;:117,-1397,7,7.00,A,Dead;:", "1479662:-1,1,-1,-898,-769,0.00;-1,2,-1,-96,-1402,0.00;-1,3,-1,117,-1392,0.00;-1,4,-1,-6,-2419,0.00;4,5,-1,5570,4395,0.00;4,6,-1,5570,4395,0.00;4,7,-1,5570,4395,0.00;4,8,-1,5570,4395,0.00;4,9,-1,5570,4395,0.00;4,10,-1,5570,4395,0.00;4,11,-1,5570,4395,0.00;4,12,-1,5570,4395,0.00;4,13,-1,5570,4395,0.00;4,14,-1,5570,4395,0.00;-1,15,-1,913,-3533,0.00;4,16,-1,5570,4395,0.00;4,17,-1,5570,4395,0.00;4,18,-1,5570,4395,0.00;4,19,-1,5570,4395,0.00;4,20,-1,5570,4395,0.00;4,21,-1,5570,4395,0.00;4,22,-1,5570,4395,0.00;4,23,-1,5570,4395,0.00;4,24,-1,5570,4395,0.00;4,25,-1,5570,4395,0.00;4,26,-1,5570,4395,0.00;4,27,-1,5570,4395,0.00;4,28,-1,5570,4395,0.00;4,29,-1,5570,4395,0.00;:117,-1392,7,7.07,A,Dead;:"];
for (var i = 0; i < chucks.length; i++){
splitChucks.push(chucks[i].split(':'))
}
for (var h = 0; h < splitChucks.length; h++) {
alert("This is the unique ID " + splitChucks[h][0]);
alert("This is the teamVal " + splitChucks[h][1]);
}
Hope this helps, this is a much more efficient way to do your task :)

var splitChucks = [];
var chucks = [ "1479661:-1,1,-1,-898,-769,0.00;-1,2,-1,-96,-1402,0.00;-1,3,-1,117,-1397,0.00;-1,4,-1,-4,-2420,0.00;4,5,-1,5570,4395,0.00;4,6,-1,5570,4395,0.00;4,7,-1,5570,4395,0.00;4,8,-1,5570,4395,0.00;4,9,-1,5570,4395,0.00;4,10,-1,5570,4395,0.00;4,11,-1,5570,4395,0.00;4,12,-1,5570,4395,0.00;4,13,-1,5570,4395,0.00;4,14,-1,5570,4395,0.00;-1,15,-1,913,-3533,0.00;4,16,-1,5570,4395,0.00;4,17,-1,5570,4395,0.00;4,18,-1,5570,4395,0.00;4,19,-1,5570,4395,0.00;4,20,-1,5570,4395,0.00;4,21,-1,5570,4395,0.00;4,22,-1,5570,4395,0.00;4,23,-1,5570,4395,0.00;4,24,-1,5570,4395,0.00;4,25,-1,5570,4395,0.00;4,26,-1,5570,4395,0.00;4,27,-1,5570,4395,0.00;4,28,-1,5570,4395,0.00;4,29,-1,5570,4395,0.00;:117,-1397,7,7.00,A,Dead;:", "1479662:-1,1,-1,-898,-769,0.00;-1,2,-1,-96,-1402,0.00;-1,3,-1,117,-1392,0.00;-1,4,-1,-6,-2419,0.00;4,5,-1,5570,4395,0.00;4,6,-1,5570,4395,0.00;4,7,-1,5570,4395,0.00;4,8,-1,5570,4395,0.00;4,9,-1,5570,4395,0.00;4,10,-1,5570,4395,0.00;4,11,-1,5570,4395,0.00;4,12,-1,5570,4395,0.00;4,13,-1,5570,4395,0.00;4,14,-1,5570,4395,0.00;-1,15,-1,913,-3533,0.00;4,16,-1,5570,4395,0.00;4,17,-1,5570,4395,0.00;4,18,-1,5570,4395,0.00;4,19,-1,5570,4395,0.00;4,20,-1,5570,4395,0.00;4,21,-1,5570,4395,0.00;4,22,-1,5570,4395,0.00;4,23,-1,5570,4395,0.00;4,24,-1,5570,4395,0.00;4,25,-1,5570,4395,0.00;4,26,-1,5570,4395,0.00;4,27,-1,5570,4395,0.00;4,28,-1,5570,4395,0.00;4,29,-1,5570,4395,0.00;:117,-1392,7,7.07,A,Dead;:"];
for (var i = 0; i < chucks.length; i++){
splitChucks.push(chucks[i].split(':'))
}
for (var h = 0; h < splitChucks.length; h++) {
alert("This is the unique ID " + splitChucks[h][0]);
alert("This is the teamVal " + splitChucks[h][1]);
}

One of the best purposes of an unique ID is to act as an index. So, instead of iterating over your index array (chunkOne), use ID as an Object key!
// 1479661:-1,1,-1,-898,-769,0.00;-1,2,-1,-96,-1402,0.00;-1,3,-1,117,-1397,0.00;-1,4,-1,-4,-2420,0.00;4,5,-1,5570,4395,0.00;4,6,-1,5570,4395,0.00;4,7,-1,5570,4395,0.00;4,8,-1,5570,4395,0.00;4,9,-1,5570,4395,0.00;4,10,-1,5570,4395,0.00;4,11,-1,5570,4395,0.00;4,12,-1,5570,4395,0.00;4,13,-1,5570,4395,0.00;4,14,-1,5570,4395,0.00;-1,15,-1,913,-3533,0.00;4,16,-1,5570,4395,0.00;4,17,-1,5570,4395,0.00;4,18,-1,5570,4395,0.00;4,19,-1,5570,4395,0.00;4,20,-1,5570,4395,0.00;4,21,-1,5570,4395,0.00;4,22,-1,5570,4395,0.00;4,23,-1,5570,4395,0.00;4,24,-1,5570,4395,0.00;4,25,-1,5570,4395,0.00;4,26,-1,5570,4395,0.00;4,27,-1,5570,4395,0.00;4,28,-1,5570,4395,0.00;4,29,-1,5570,4395,0.00;:117,-1397,7,7.00,A,Dead;:
var data =
{
1479661:
[
-1,1,-1,-898,-769,0.00,-1,2,-1,-96,-1402,0.00,-1,3,-1,117,-1397,0.00,-1,4,-1,-4,-2420,0.00,4,5,-1,5570,4395,0.00,4,6,-1,5570,4395,0.00,4,7,-1,5570,4395,0.00,4,8,-1,5570,4395,0.00,4,9,-1,5570,4395,0.00,4,10,-1,5570,4395,0.00,4,11,-1,5570,4395,0.00,4,12,-1,5570,4395,0.00,4,13,-1,5570,4395,0.00,4,14,-1,5570,4395,0.00,-1,15,-1,913,-3533,0.00,4,16,-1,5570,4395,0.00,4,17,-1,5570,4395,0.00,4,18,-1,5570,4395,0.00,4,19,-1,5570,4395,0.00,4,20,-1,5570,4395,0.00,4,21,-1,5570,4395,0.00,4,22,-1,5570,4395,0.00,4,23,-1,5570,4395,0.00,4,24,-1,5570,4395,0.00,4,25,-1,5570,4395,0.00,4,26,-1,5570,4395,0.00,4,27,-1,5570,4395,0.00,4,28,-1,5570,4395,0.00,4,29,-1,5570,4395,0.00,117,-1397,7,7.00,"A","Dead"
]
// More data...
};
Object.keys(data).forEach(function(key)
{
console.log('This is ID ' + key);
data[key].forEach(function(value,index,array)
{
console.log('Index ' + index + ' of data key ' + key + ':');
console.log(data[key][index]);
});
});
Test this on any modern browser's console or node.js instance to see results.

How to build a simple string from a multidimensional array?

Basically, I have a multidimensional array that I need to build into a simple string.
Quite an easy question, although it has been eating away at me for quite some time now since I can't seem to nail it.
Here is an example of how my array could look with just 3 questions within it:
[["question1","answer1","answer2","answer3","answer4"],["question2","answer1","answer2","answer3","answer4"],["question3","answer1","answer2","answer3","answer4"]]
For example, D.rows[0][0] would be "question1" and D.rows[2][3] would be "answer3", just to clarify.
Here is how it must be saved into a string as:
question1,answer1,answer2,answer3,answer4
question2,answer1,answer2,answer3,answer4
question3,answer1,answer2,answer3,answer4
Each element must have a comma between them, and each question must be separated by a line-break.
This is what I currently have that is not working:
var fullString;
for (i = 0; i < csvArray.length; ++i)
{
second = secondArray[i];
for (j = 0; j < second.length; ++j)
{
fullString += entry[j] + "'";
}
fullString += "\n";
}
Thanks in advance!

try this
var s,a=[["question1","answer1","answer2","answer3","answer4"],"question2","answer1","answer2","answer3","answer4"],["question3","answer1","answer2","answer3","answer4"]];
for(i=0; i < a.length; i++){
s=(s)?s+"\n\r"+a[i].join():a[i].join();
}
jsfiddle example
In your own example: since you are going straight to adding to fullString, it should have an empty string for value, otherwise you will end up with undefined in the beginning.
var fullString="";
this part second = secondArray[i]; should have been
var second = csvArray[i];
and in a same way this fullString += entry[j] + "'"; should have been
fullString += second[j] + ",";

one liner:
var result = [["question1","answer1","answer2","answer3","answer4"],["question2","answer1","answer2","answer3","answer4"],["question3","answer1","answer2","answer3","answer4"]].join('\r\n');

something like this:
var questionAnswerSet= { "question1" : [
{ "answer1" : "value",
"answer2" : "value",
"answer3" : value}
],
"question2" : [
{ "answer1" : "value",
"answer2" : "value",
"answer3" : value}
],
}
and access like this:
questionAnswerSet[0].answer2 // question one answer 2
questionAnswerSet[1].answer2 // question two answer 2

for (var i=0; i<yourArray.length; i++) { // iterate on the array
var obj = yourArray[i];
for (var key in obj) { // iterate on object properties
var value = obj[key];
console.log(value);
}
}

If you have an array as this...
var arr = [["question1","answer1","answer2","answer3","answer4"],["question2","answer1","answer2","answer3","answer4"],["question3","answer1","answer2","answer3","answer4"]];
then...
var strArr = arr.join(',');
var strLine = arr.join('\n'); // string with line breaks.
will do that for you.
if you want different strings for each question-answer block, then...
var strJoinArr = [], strJoinLines = '';
for(var i = 0; i < arr.length; i++){
strJoinArr.push(arr[i].join(','));
strJoinLines += arr[i].join(',')+ '\n'; // string with line break
}
then to access each section you can use indexes,
For example, strJoinArr[2] will return 'question3,answer1,answer2,answer3,answer4'
more on .join()
more on .push()

This might be your solution if you plan ot change separators or number of answers.
var array = [["question1","answer1","answer2","answer3","answer4"],["question2","answer1","answer2","answer3","answer4"],["question3","answer1","answer2","answer3","answer4"]],
string = "";
for (var i = 0; i <= array.length - 1; i++) {
string +=array[i].join(', ');
string += "\n";
}
Also, in the less readable but also effective way, for any object of this structure
string = array.join('\r\n');

How to get length string json in js or jQuery

i have this code,
buildSelect: function (data) {
var response = $.parseJSON(data);
alert(response.length);
var s = "<select>";
if (response && response.length) {
for (var i = 0, l = response.length; i < l; i++) {
var ri = response[i];
s += '<option value="' + ri.CUSTOMS_ID + '">'
+ ri.CUSTOMS_NAME + '</option>';
}
}
return s + "</select>";
}
},
i want check response is n't null or empty and get length i write this code response.length
but return undifine
and data return
{"rows":[{"id":1,"cell":["1","بندرامام خميني","IMAM KHOMEINI PORT","True",null]},{"id":2,"cell":["2","آبادان","ABADAN","True",null]},{"id":3,"cell":["3","خرمشهر","KHORRAMSHAHR","True",null]},{"id":4,"cell":["4","بندرعباس","BANDAR ABBAS","True",null]},{"id":5,"cell":["5","بوشهر","BUSHEHR","True",null]},{"id":6,"cell":["6","تهران","TEHRAN","True",null]},{"id":7,"cell":["7","شيراز","SHIRAZ","True",null]},{"id":8,"cell":["8","دبي","DUBAI","True",null]}],"Page":0,"Total":0,"Records":0}
i want if Rows isn't empty all child add to DropDownlist
plese help me, thanks

The issue is that response doesn't have a length property. However, response.rows, as an Array, does:
var response = $.parseJSON(data);
alert(response.rows.length);
You could then save a reference to response.rows and use that going forward:
var rows = response.rows;
alert(rows.length);
var s = "<select>";
if (rows && rows.length) {
for (var i = 0, l = rows.length; i < l; i++) {
var ri = rows[i];
s += '<option value="' + ri.id + '">' + ri.cell[1] + '</option>';
}
}
return s + "</select>";

$.parseJSON(data) returns JavaScript object and not a string. You cannot use length on an object. According to documentation $.parseJSON will return null if you pass in nothing, an empty string, null, or undefined.
UPD:
In your particular case it is enough to check that response is not null (no need to check the length). If data is not a valid JSON then $.parseJSON(data) will through an exception. You may want to catch it as well.

Once you've parsed the JSON string, in this case, you will get an Object in you var response. JavaScript objects do not have a length property. If you just want to check for a null or empty value then do one or more of the following.
var data = "";//in case of null data
if(!data){
//do something
}
//or
if(data === ''){
//do something
}
Now, if you want to check whether your rows are empty,
var data = {
rows:{}
};//assuming an empty rows object
if($.isEmptyObject(data.rows)){
//do something
}

Since object does not contain length property/method and there is no sense for length of object.you can assign methods and properties to each object, pre-written or self-defined.
In your case try to search for object data/properties,like
for(keys in response){
check some properties related on keys
}

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