CODEWITHSUNDEEP
javascriptarraysjsonassociative-array
Guillermo
Guillermo

Reputation: 326

find a value in JSON stringify array

i want to find a value in JSON stringify array

[{"id":"432","temperature":"1","humidity":"1","createat":"0000-00-00 00:00:00"},{"id":"433","temperature":"22.00","humidity":"48","createat":"2015-10-11 19:49:57"},{"id":"434","temperature":"22.40","humidity":"48","createat":"2015-10-11 19:52:02"},{"id":"435","temperature":"22.40","humidity":"48","createat":"2015-10-11 19:55:26"},{"id":"436","temperature":"22.00","humidity":"48","createat":"2015-10-11 19:58:50"},{"id":"437","temperature":"22.00","humidity":"48","createat":"2015-10-11 20:02:14"},{"id":"438","temperature":"22.50","humidity":"51","createat":"2015-10-11 21:23:15"},{"id":"439","temperature":"22.50","humidity":"50","createat":"2015-10-11 21:24:37"},{"id":"440","temperature":"22.50","humidity":"51","createat":"2015-10-11 21:26:17"},{"id":"441","temperature":"22.50","humidity":"51","createat":"2015-10-11 21:26:41"}]

my idea to get this value is to know if what i am adding is not already added

Upvotes: 1

Views: 5125

Answers (3)

Felipe Brahm
Felipe Brahm

Reputation: 3160

// stringified JSON
stringifiedJson = '[{"id":"432","temperature":"1","humidity":"1","createat":"0000-00-00 00:00:00"},{"id":"433","temperature":"22.00","humidity":"48","createat":"2015-10-11 19:49:57"},{"id":"434","temperature":"22.40","humidity":"48","createat":"2015-10-11 19:52:02"},{"id":"435","temperature":"22.40","humidity":"48","createat":"2015-10-11 19:55:26"},{"id":"436","temperature":"22.00","humidity":"48","createat":"2015-10-11 19:58:50"},{"id":"437","temperature":"22.00","humidity":"48","createat":"2015-10-11 20:02:14"},{"id":"438","temperature":"22.50","humidity":"51","createat":"2015-10-11 21:23:15"},{"id":"439","temperature":"22.50","humidity":"50","createat":"2015-10-11 21:24:37"},{"id":"440","temperature":"22.50","humidity":"51","createat":"2015-10-11 21:26:17"},{"id":"441","temperature":"22.50","humidity":"51","createat":"2015-10-11 21:26:41"}]';

// parse the stringified JSON into a JavaScript object
parsedJson = JSON.parse(stringifiedJson);

// the object in the array you want to check
number = 0

// check if the property exists
if(typeof parsedJson[number].humidity !== 'undefined') {
  // set the property
  parsedJson.humidity = 1;
}

// stringify your object again
stringifiedJson = JSON.stringify(parsedJson);

EDIT: here is a propertyExists function:

var propertyExists = function(stringifiedJson, id, property) {
  // parse the stringified JSON into a JavaScript object
  parsedJson = JSON.parse(stringifiedJson);
  // check if the property exists for a given ID
  for(var i = 0; i < parsedJson.length; i += 1) {
    if(parseInt(parsedJson[i].id) === parseInt(id)) {
      return (typeof parsedJson[i][property] !== 'undefined')
    }
  }
  return false;
}

// stringified json
var stringifiedJson = '[{"id":"432","temperature":"1","humidity":"1","createat":"0000-00-00 00:00:00"},{"id":"433","temperature":"22.00","humidity":"48","createat":"2015-10-11 19:49:57"},{"id":"434","temperature":"22.40","humidity":"48","createat":"2015-10-11 19:52:02"},{"id":"435","temperature":"22.40","humidity":"48","createat":"2015-10-11 19:55:26"},{"id":"436","temperature":"22.00","humidity":"48","createat":"2015-10-11 19:58:50"},{"id":"437","temperature":"22.00","humidity":"48","createat":"2015-10-11 20:02:14"},{"id":"438","temperature":"22.50","humidity":"51","createat":"2015-10-11 21:23:15"},{"id":"439","temperature":"22.50","humidity":"50","createat":"2015-10-11 21:24:37"},{"id":"440","temperature":"22.50","humidity":"51","createat":"2015-10-11 21:26:17"},{"id":"441","temperature":"22.50","humidity":"51","createat":"2015-10-11 21:26:41"}]';

console.log(propertyExists(stringifiedJson, 432, 'humidity'));

Upvotes: 2

RobG
RobG

Reputation: 147413

i want to find a value in JSON stringify array

You don't say what value you are trying to find. What you've posted is an Array literal, not JSON. If you want to iterate over the array to determine if it contains an object with a certain property that has a particular value, you can use Array.prototype.some:

function hasPropValue(array, prop, value) {
  return array.some(function(obj) {
    return obj.hasOwnProperty(prop) && obj[prop] === value;
  }
}

some will iterate only over members that exist, and will stop as soon as the callback returns true, otherwise it returns false. If you really do have a string value that is valid JSON, you can do:

hasPropValue(JSON.parse(jsonText), 'id', '432');


var jsonText = '[{"id":"432","temperature":"1","humidity":"1","createat":"0000-00-00 00:00:00"},{"id":"433","temperature":"22.00","humidity":"48","createat":"2015-10-11 19:49:57"},{"id":"434","temperature":"22.40","humidity":"48","createat":"2015-10-11 19:52:02"},{"id":"435","temperature":"22.40","humidity":"48","createat":"2015-10-11 19:55:26"},{"id":"436","temperature":"22.00","humidity":"48","createat":"2015-10-11 19:58:50"},{"id":"437","temperature":"22.00","humidity":"48","createat":"2015-10-11 20:02:14"},{"id":"438","temperature":"22.50","humidity":"51","createat":"2015-10-11 21:23:15"},{"id":"439","temperature":"22.50","humidity":"50","createat":"2015-10-11 21:24:37"},{"id":"440","temperature":"22.50","humidity":"51","createat":"2015-10-11 21:26:17"},{"id":"441","temperature":"22.50","humidity":"51","createat":"2015-10-11 21:26:41"}]'

function hasPropValue(array, prop, value) {
  return array.some(function(obj) {
    return obj.hasOwnProperty(prop) && obj[prop] === value;
  });
}

document.write(hasPropValue(JSON.parse(jsonText), 'id', '432'));

Upvotes: 0

A.O.
A.O.

Reputation: 3763

....

var jsonArray = [{"id":"432","temperature":"1","humidity":"1",.....

var isPresent = false;
$.each(jsonArray, function(i,v){
    if(jsonArray[i].id == newObject.id){
        isPresent = true;
    }
});
if(!isPresent){
    jsonArray.push(newObject);
}

....

Upvotes: 1

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