I want to delete a property of a node, so I have written something like this -
var params={};
var propKey="somekey"+"#Delete";
params[propKey] = "some value";
params["_charset_"] ="utf-8";
$CQ.post("/path/to/my/node",params,null);
above code is not deleting from the node. Kindly advice!
some value should actually be null, otherwise the property has a value and won't be deleted. The type hint only works for the empty values, like null.
var params={};
params["somekey"+"#Delete"] = null;
params["_charset_"] ="utf-8";
$CQ.post("/path/to/my/node", params, null);
Related
So, I get some JSON values from the server but I don't know if there will be a particular field or not.
So like:
{ "regatta_name":"ProbaRegatta",
"country":"Congo",
"status":"invited"
}
And sometimes, there will be an extra field like:
{ "regatta_name":"ProbaRegatta",
"country":"Congo",
"status":"invited",
"club":"somevalue"
}
I would like to check if the field named "club" exists so that at parsing I won't get
org.json.JSONException: No value for club
JSONObject class has a method named "has":
http://developer.android.com/reference/org/json/JSONObject.html#has(java.lang.String)
Returns true if this object has a mapping for name. The mapping may be NULL.
You can check this way where 'HAS' - Returns true if this object has a mapping for name. The mapping may be NULL.
if (json.has("status")) {
String status = json.getString("status"));
}
if (json.has("club")) {
String club = json.getString("club"));
}
You can also check using 'isNull' - Returns true if this object has no
mapping for name or if it has a mapping whose value is NULL.
if (!json.isNull("club"))
String club = json.getString("club"));
you could JSONObject#has, providing the key as input and check if the method returns true or false. You could also
use optString instead of getString:
Returns the value mapped by name if it exists, coercing it if
necessary. Returns the empty string if no such mapping exists
just before read key check it like before read
JSONObject json_obj=new JSONObject(yourjsonstr);
if(!json_obj.isNull("club"))
{
//it's contain value to be read operation
}
else
{
//it's not contain key club or isnull so do this operation here
}
isNull function definition
Returns true if this object has no mapping for name or
if it has a mapping whose value is NULL.
official documentation below link for isNull function
http://developer.android.com/reference/org/json/JSONObject.html#isNull(java.lang.String)
You can use has
public boolean has(String key)
Determine if the JSONObject contains a specific key.
Example
JSONObject JsonObj = new JSONObject(Your_API_STRING); //JSONObject is an unordered collection of name/value pairs
if (JsonObj.has("address")) {
//Checking address Key Present or not
String get_address = JsonObj .getString("address"); // Present Key
}
else {
//Do Your Staff
}
A better way, instead of using a conditional like:
if (json.has("club")) {
String club = json.getString("club"));
}
is to simply use the existing method optString(), like this:
String club = json.optString("club);
the optString("key") method will return an empty String if the key does not exist and won't, therefore, throw you an exception.
Try this:
let json=yourJson
if(json.hasOwnProperty(yourKey)){
value=json[yourKey]
}
Json has a method called containsKey().
You can use it to check if a certain key is contained in the Json set.
File jsonInputFile = new File("jsonFile.json");
InputStream is = new FileInputStream(jsonInputFile);
JsonReader reader = Json.createReader(is);
JsonObject frameObj = reader.readObject();
reader.close();
if frameObj.containsKey("person") {
//Do stuff
}
Try this
if(!jsonObj.isNull("club")){
jsonObj.getString("club");
}
I used hasOwnProperty('club')
var myobj = { "regatta_name":"ProbaRegatta",
"country":"Congo",
"status":"invited"
};
if ( myobj.hasOwnProperty("club"))
// do something with club (will be false with above data)
var data = myobj.club;
if ( myobj.hasOwnProperty("status"))
// do something with the status field. (will be true with above ..)
var data = myobj.status;
works in all current browsers.
You can try this to check wether the key exists or not:
JSONObject object = new JSONObject(jsonfile);
if (object.containskey("key")) {
object.get("key");
//etc. etc.
}
I am just adding another thing, In case you just want to check whether anything is created in JSONObject or not you can use length(), because by default when JSONObject is initialized and no key is inserted, it just has empty braces {} and using has(String key) doesn't make any sense.
So you can directly write if (jsonObject.length() > 0) and do your things.
Happy learning!
You can use the JsonNode#hasNonNull(String fieldName), it mix the has method and the verification if it is a null value or not
I have created a rootScope variable like
$rootScope.globalData = data;
$rootScope.globalData.chillerConditions.HeatSource.Value = "ST"; //Default Value
$scope.chillerConditions.HeatSource.Value = 1; //Default Value
where data is my returning value from api. Also create a scope variable which is a object contains a list of items.
$scope.chillerAttributes = data.ObjCandidateListChillerAttributes;
$scope.chillerConditions = data.ObjCandidateListConditions;
On HTML I have:
<select ng-model="chillerConditions.HeatSource.Value" style="width:53%;" ng-options="item.Id as item.Description for item in ValidRatingHeatSource" ng-change="heatSourceChanged()" id="ddRatingHeatSource" class="form-control search-select designComboboxHeight" data-container="body"></select>
Here ValidRatingHeatSource is
$scope.ValidRatingHeatSource = \*list of items*\
On change of Drop Down I have written an function. In that
if($scope.chillerConditions.HeatSource.Value == 2)
{
$rootScope.globalData.chillerConditions.HeatSource.Value = "HW";
}
else
{
$rootScope.globalData.chillerConditions.HeatSource.Value = "ST";
}
Till now was the my current code.
Issue is :
When the above function is called then whenever current $rootScope varible i.e. $rootScope.globalData.chillerConditions.HeatSource.Value is changed to "HW" or "ST" it also changing $scope.chillerConditions.HeatSource.Value to "HW" or "ST".
Why so?
Is there any inbuilt functionality in angularjs?
Please suggest if I am making any mistake? New suggestion are also welcome.
This behavior is the way JavaScript works and has nothing to do with AngularJS. JavaScript is an object-oriented (prototype-based) language where objects are addressed by reference and not by value. E.g. assign car2 to car1 and both of them will reference the same object (JSFiddle)
var car1 = {make: "Audi"}
var car2 = car1;
car2.make = "Toyota";
So in your case, $rootScope.globalData.chillerConditions.HeatSource and $scope.chillerConditions.HeatSource are the same object.
Rather, it seems like you want to create a copy. You can do so with angular.Copy
$scope.chillerAttributes = angular.copy(data.ObjCandidateListChillerAttributes);
$scope.chillerConditions = angular.copy(data.ObjCandidateListConditions);
In your example u have both ng-model and ng-change, so:
1. User change value in select.
2. $scope.chillerConditions.HeatSource.Value changes (ng-model)
3. heatSourceChanged starts (ng-change) -> $rootScope.globalData.chillerConditions.HeatSource.Value changes
So everything works as should...
$location.search() to set an url
the search parameter which is passed to the search() is set by a form. selecting and deselecting an element causes some parameters value to be "null" and so the url looks like this :
myapp.com/search?type=text¶meter=null
so i would like to remove those "null" parameters from the url. In the documentation, there is a "paramValue" which can be passed as a second parameters to .search(search, paramValue) : If the value is null, the parameter will be deleted.
but i can't make this work… any suggestion ?
edit: here is a solution based on #BKM explanation
to remove every parameters which are null, it's necessary to loop through all of them and test each one, like this :
for (var i in search) {
if (!search[i]) $location.search(i, null);
}
$location.search(search);
Using the $location service, you can remove the search param by assigning it a null value:
In the case when your parameter is null, in your case 'parameter' you can remove it from the url by assigning it a null value like;
$location.search('parameter', null);
You can use $location.search({}) to clear all at once.
You can also do:
var search = $location.search();
if (search.parameter == 'null') {
$location.search({'parameter': null});
}
I have such objects in ScriptDb,
[{a:1,b:2,c:3},{a:0,b:0}]
How do I query object without key c?
It seems the only way is to query all object using db.query({}), then use something like "typeof result.c == 'undefined'".
Is there a way to do it in ScriptDb?
Thanks.
You can use that to get records without c:
var db = ScriptDb.getMyDb();
var result = db.query({c: db.not(db.anyValue())});
while (result.hasNext()) {
var current = result.next();
Logger.log ("a= "+current.a+", c="+current.c);
}
The ones with c:
var result = db.query({c: db.anyValue()});
These functions (not, anyValue...) are documented in Class ScriptDbInstance
I keep getting a NullReferenceException at this line UserRoot.Element("User_ID").Value = User.User_ID.ToString();
What exactly am I doing wrong?
Here's the majority of the code for that method
if (File.Exists(Path2UserDB + User.User_ID.ToString() + ".db") == false)
{
File.Create(Path2UserDB + User.User_ID.ToString() + ".db");
}
XElement UserRoot = new XElement("User");
UserRoot.Element("User_ID").Value = User.User_ID.ToString();
UserRoot.Element("Full_Name").Value = User.Full_Name;
UserRoot.Element("Gender").Value = User.Gender;
UserRoot.Element("BirthDate").Value = User.BirthDate.ToString();
UserRoot.Element("PersonType").Value = User.PersonType.ToString();
UserRoot.Element("Username").Value = User.Username;
UserRoot.Element("Password").Value = User.Password;
UserRoot.Element("Email_adddress").Value = User.Email_Address;
XDocument UserDoc = new XDocument();
UserDoc.Save(Path2UserDB + User.User_ID.ToString() + ".db");
Thanks
I know that saving Usernames and Passwords in plain text is incredibly unsafe, but this is only going to be accessed by one process that I will eventually implement strong security
The Element("User_ID") method returns an existing element named <User_ID>, if any.
Since your XML element is empty, it returns null.
You should create your XML like this:
var userDoc = new XDocument(
new XElement("User",
new XElement("User_ID", User.User_ID),
new XElement("Full_Name", User.Full_Name),
new XElement("Gender", User.Gender),
...
)
);
Alternatively, you can call the Add method to add a node to an existing element.
You are getting this error, because there is no XML element called User_ID under UserRoot to set its value. If you comment it out, you will get the same error on the next line and so on for every other Element, since you haven't added Elements with thos names. To create the tree that you want, try this:
XElement UserRoot =
new XElement("User",
new XElement("User_ID", User.User_ID.ToString()),
new XElement("Full_Name", User.Full_Name),
new XElement("Gender", User.Gender),
new XElement("BirthDate", User.BirthDate.ToString()),
new XElement("PersonType", User.PersonType.ToString()),
new XElement("Username", User.Username),
new XElement("Password", User.Password),
new XElement("Email_adddress", User.Email_Address)
);
The following MSDN link on XML Tree Creation with XElement will be of help.
You want to check if the value is null or empty before running methods on it.
if(!String.IsnullorEmpty(User.User_ID))
UserRoot.Element("User_ID").Value = User.User_ID.ToString();