Updating a JSON object using Javascript

Question

How can i update the following JSON object dynamically using javascript or Jquery   var jsonObj      Id   1   Username   Ray   FatherName   Thompson                       Id   2   Username   Steve   FatherName   Johnson                     Id   3   Username   Albert   FatherName   Einstein      I would like to dynamically update the Username to  Thomas  where the  Id  is  3    How can I acheive this

User · Answer

JSON is the JavaScript Object Notation    There is no such thing as a JSON object   JSON is just a way of representing a JavaScript object in text   So what you re after is a way of updating a in in-memory JavaScript object   qiao s answer shows how to do that simply enough

User · Answer

A plain JavaScript solution  assuming jsonObj already contains JSON   Loop over it looking for the matching Id  set the corresponding Username  and break from the loop after the matched item has been modified   for  var i   0  i  lt  jsonObj length  i        if  jsonObj i  Id     3        jsonObj i  Username    Thomas       break          Here it is on jsFiddle   Here s the same thing wrapped in a function   function setUsername id  newUsername      for  var i   0  i  lt  jsonObj length  i          if  jsonObj i  Id     id          jsonObj i  Username   newUsername        return                  Call as setUsername 3   Thomas

User · Answer

simply iterate over the list then check the properties of each object   for  var i   0  i  lt  jsonObj length    i        if  jsonObj i   Id        3             jsonObj i   Username      Thomas

User · Answer

I took Michael Berkowski s answer a step  or two  farther and created a more flexible function allowing any lookup field and any target field  For fun I threw splat     capability in there incase someone might want to do a replace all  jQuery is NOT needed  checkAllRows allows the option to break from the search on found for performance or the previously mentioned replace all    function setVal update           Included to show an option if you care to use jQuery       var defaults     jsonRS  null  lookupField  null  lookupKey  null          targetField  null  targetData  null  checkAllRows  false           update     extend     defaults  update           for  var i   0  i  lt  update jsonRS length  i              if  update jsonRS i  update lookupField      update lookupKey    update lookupKey                        update jsonRS i  update targetField    update targetData              if   update checkAllRows    return                        var jsonObj      Id   1   Username   Ray   FatherName   Thompson                   Id   2   Username   Steve   FatherName   Johnson                 Id   3   Username   Albert   FatherName   Einstein      With your data you would use like    var update         jsonRS  jsonObj      lookupField   Id       lookupKey  2       targetField   Username       targetData   Thomas        checkAllRows  false         setVal update     And Bob s your Uncle      Works great

User · Answer

use   var parsedobj   jQuery parseJSON  jsonObj     This will only be useful if you don t need the format to stay in string  otherwise you d have to convert this back to JSON using the JSON library

User · Answer

var jsonObj      Id   1   Quantity   2   Done   0   state   todo            product id   315   LBI-W-SL-3-AG-TA004-C650-36  LAURA BONELLI-WOMEN S-SANDAL             Username   Ray   FatherName   Thompson                  Id   2   Quantity   2   Done   0   state   todo              product id   314   LBI-W-SL-3-AG-TA004-C650-36  LAURA BONELLI-WOMEN S-SANDAL               Username   Steve   FatherName   Johnson                Id   3   Quantity   2   Done   0   state   todo              product id   316   LBI-W-SL-3-AG-TA004-C650-36  LAURA BONELLI-WOMEN S-SANDAL               Username   Albert   FatherName   Einstein                for  var i   0  i  lt  jsonObj length    i                if  jsonObj i   product id   0      314                      this onemorecartonsamenumber                      jsonObj i   Done        this quantity done                      if jsonObj i   Quantity       jsonObj i   Done                       console log  both are equal                      jsonObj i   state      packed                    else                    console log  not equal                      jsonObj i   state      todo                                      console log  quantiy  jsonObj i   Quantity                     console log  done  jsonObj i   Done                                        console log  final  jsonObj      quantity done  any   0     onemorecartonsamenumber         this quantity done    1      console log this quantity done   1

User · Answer

For example I am using this technique in Basket functionality   Let us add new Item to Basket   var productArray         document  on  click    cartBtn   function e     e preventDefault        this  html   lt i class  fa fa-check  gt  lt  i gt Added to cart      console log  Item added       var productJSON   id    this  attr  pr id     nameEn    this  attr  pr name en     price    this  attr  pr price     image    this  attr  pr image     quantity  1   discount  0   total    this  attr  pr price         if localStorage getObj  product     null       productArray localStorage getObj  product        productArray push productJSON         localStorage setObj  product   productArray           else      productArray push productJSON         localStorage setObj  product   productArray             itemCountInCart productArray length          After adding some item to basket - generates json array like this                   id    95            nameEn    New Braslet            price    8776            image    1462012394815 jpeg            quantity   1           discount   0           total    8776                        id    96            nameEn    new braslet            price    76            image    1462012431497 jpeg            quantity   1           discount   0           total    76                        id    97            nameEn    khjk            price    87            image    1462012483421 jpeg            quantity   1           discount   0           total    87            For Removing some item from Basket     document  on  click    itemRemoveBtn   function     var arrayFromLocal localStorage getObj  product    findAndRemove arrayFromLocal  id    this  attr  basketproductid     localStorage setObj  product   arrayFromLocal   loadBasketFromLocalStorageAndRender           This function will remove element by specified property  In my case this is ID  function findAndRemove array  property  value      array forEach function result  index        if result property      value            Remove from array       console log  Removed from index is   index   result is   JSON stringify result          array splice index  1                        And Finally the real answer of the question  Updating a JSON object using JS   In my example updating product quantity and total price on changing the  number  element value     document  on  keyup mouseup   input type number   function       var arrayFromLocal localStorage getObj  product      setQuantityAndTotalPrice arrayFromLocal   this  attr  updateItemid     this  val       localStorage setObj  product   arrayFromLocal     loadBasketFromLocalStorageAndRender         function setQuantityAndTotalPrice array id quantity       array forEach function result  index        if result id     id          result quantity quantity        result total  quantity result price

User · Answer

document  ready function                var jsonObj      Id   1   Username   Ray   FatherName   Thompson                       Id   2   Username   Steve   FatherName   Johnson                     Id   3   Username   Albert   FatherName   Einstein            each jsonObj function i v                if  v Id    3            v Username    Thomas           return false                   alert  New Username      jsonObj 2  Username

User · Answer

var i   jsonObj length  while   i -- gt  0         if   jsonObj i  Id     3             jsonObj  i   Username    Thomas           break            Or  if the array is always ordered by the IDs   jsonObj  2   Username    Thomas

[javascript] Updating a JSON object using Javascript

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