Convert element of array to String when extracting in Json by JavaScript

Question

I have a Json document as:

{
  "_id": "13fee4aad95c7f822c0b559bd8d09fb0",
  "_rev": "5-336dea3680af3e7ec0de29369be90b09",
  "attributeCollection": {
    "attributeArray": [
      {
          "name": "Web Issue",
          "value": [
          "web security authentication"
        ]
      }
    ]
  },
  "hash": "1047fe2e1e58e5c8246b26f015d0ecd7"
}

I already extracted "value" by JS with this code:

if (doc.attributeCollection.attributeArray[i].value) {
        for (var j=0; j<doc.attributeCollection.attributeArray[i].value.length; j++) {
            value = doc.attributeCollection.attributeArray[i].value[j];
        }
}

My problem is how to convert "value" to string. Because "value" just has 1 element, i used some ways as:

var content=value.toString();

or

var content=value.join("");

Even I use loop as:

var content="";
for(var i; i<value.length; i++){
   content=content+value[i];
}

It still doesn't work, what is the problem in these cases.

the "value" is extracted successfully from Json, it already returned an array. The problem is how to convert element ""web security authentication" to string. — Nguyen Chi Hieu
– Nguyen Chi Hieu, Commented May 3, 2016 at 8:02
this value is already in string. why you need to convert again? — Jitendra Tiwari
– Jitendra Tiwari, Commented May 3, 2016 at 8:04
It is not a string, because when i call a function with string parameter. It can not recognize "value" is a string. — Nguyen Chi Hieu
– Nguyen Chi Hieu, Commented May 3, 2016 at 8:06

Jitendra Tiwari · Accepted Answer · 2016-05-03 08:12:09Z

1

Where is your i?? I have replace i with 0 and its working fine.

  var value=[];
  var doc={
    "_id": "13fee4aad95c7f822c0b559bd8d09fb0",
    "_rev": "5-336dea3680af3e7ec0de29369be90b09",
    "attributeCollection": {
      "attributeArray": [
        {
          "value": [
            "web security authentication"
          ]
        }
      ]
    },
    "hash": "1047fe2e1e58e5c8246b26f015d0ecd7"
  };

  if (doc.attributeCollection.attributeArray[0].value) {
          for (var j=0; j<doc.attributeCollection.attributeArray[0].value.length; j++) {
              value.push(doc.attributeCollection.attributeArray[0].value[j]);
          }
  }

 console.log(value.join(""));

edited May 3, 2016 at 8:12

answered May 3, 2016 at 8:02

Jitendra Tiwari

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8 Comments

Nguyen Chi Hieu Over a year ago

You printed out an array, not a string.

Jitendra Tiwari Over a year ago

@NguyenChiHieu I have improve my answer. please check.

Nguyen Chi Hieu Over a year ago

the problem which i mentioned is how to convert array "value" to string after extracting from Json. Your solution I already mentioned in the topic. It doesn't work.

Jitendra Tiwari Over a year ago

do you have any jsfiddle? this is working fine here

Nguyen Chi Hieu Over a year ago

as I mentioned alert and console.log printed "value" as array. I checked in a function with string parameter input. It doesn't work with "value".

|

Valery K. · Accepted Answer · 2016-05-03 08:05:11Z

0

Try this:

` var doc={ "_id": "13fee4aad95c7f822c0b559bd8d09fb0", "_rev": "5-336dea3680af3e7ec0de29369be90b09", "attributeCollection": { "attributeArray": [{ "value": [ "web security authentication" ] }] }, "hash": "1047fe2e1e58e5c8246b26f015d0ecd7" };

var value=[];

if(doc.attributeCollection.attributeArray.length>0){
    for(var i=0;i<doc.attributeCollection.attributeArray.length;i++){
        value.push(doc.attributeCollection.attributeArray[i].value);
    }
}

value=value.join("\n");
console.log(value);

`

answered May 3, 2016 at 8:05

Valery K.

1571 silver badge5 bronze badges

3 Comments

Nguyen Chi Hieu Over a year ago

It still doesn't work, I use a function with string parameter. It can not recognize "value" as a string.

Valery K. Over a year ago

If doc is string -- you can use doc=JSON.parse(doc); and use this code

Nguyen Chi Hieu Over a year ago

Yeah, obtaining "value" from Json is already done, I already got "value" but converting the "value" to pure string is my problem.

Nguyen Chi Hieu · Accepted Answer · 2016-05-10 09:01:45Z

0

I suspect the problem happens on integer elements. So tried this:

value = value + "";

Note: cloudant has trouble indexing empty string. So before calling index on anything, make sure it is never an empty string, or the search will fail on that document without telling you why (index will pass as successful, but it will not work)

answered May 10, 2016 at 9:01

Nguyen Chi Hieu

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