Replace null values to empty values in a JSON OBJECT

Question

Hi I\'ve got a JSON object provided by an ajax request.

Some of the values inside the json appears as null, but I want an empty String inst

Answer 1

Hope this help

var List = [];


$.post("/profil_process/wall/preview-post.php",param, function (data){

jQuery.each(data, function (key, value) {
                List.push({
                    ReportId : value.ReportId,
                    ReportType: CheckNullReturnBlank(value.ReportType),
                    ReportName: CheckNullReturnBlank(value.ReportName),
                    Description : CheckNullReturnBlank(value.Description)
                })
            });   },'json');



function CheckNullReturnBlank(item) {
    return item = (item == null) ? '' : item;
}

Answer 2

Here's how you should be doing it, replacing the objects values with empty strings, not stringifying it

$.post("/profil_process/wall/preview-post.php",param, function (data){

    (function removeNull(o) {
        for(var key in o) {
            if( null === o[key] ) o[key] = '';
            if ( typeof o[key] === 'object' ) removeNull(o[key]);
        }
     })(data);

     $('#previewWall').html(
          getPostWall(
              data.type,
              data.titre,data.url,
              data.description,
              data.media,
              data.photo_auteur,
              data.nom_auteur,
              data.url_auteur,
              data.date_publication
          )  // ^^^ why not just pass the entire object ?
    ).fadeIn();

    $(".bouton-vertM").show();
    $("#wLoader").hide();

},'json');

Answer 3

If you can replace null-s with empty strings on serialized string, do something like this:

data = JSON.parse(JSON.stringify(data).replace(/\:null/gi, "\:\"\"")); 

Answer 4

function returnblank(item){
  if(item == null){
    return "";
  }else{
    return item;
  }
}

Answer 5

Your function should be like this:

function (key, value) {
    return (value == null) ? "" : value
}

Checks null and undefined values and returns an empty string

Answer 6

I recommend you the check the return type of the Ajax because it determines how to remove null.

If it is string, you can use this:

data = data.replace(/null/g, '""');  //Stays as string

Or:

data = JSON.parse(data);    // Turns to a JSON object

If it is json object, then you can use this:

data = JSON.stringify(data).replace(/null/g, '""');  //Turns to string