Develop Reference

how can i avoid error "can't convert undefined to an object "

some of the document does not consists planDetails planId properties and its returning error "can't convert undefined to an object , but i have to fetch that document if these properties exists or not , how can i avoid this error
this.profile.find({ userId: ObjectId(req.id) }).populate("planId").lean().exec(function(err, profileFound) {
console.log(profileFound);
if (err) return callback(err);
if (profileFound && profileFound.length === 0) {
return callback(false, common.errorMsg("PROFILE DOES NOT EXIST"));
} else {
var profileData = profileFound[0];
profileData["isPlanTaken"] = false;
profileData["planDetails"] = {};
if(profileData.hasOwnProperty("planId") && profileData.planId){
if(Object.keys(profileData.planId).length>0){
profileData["isPlanTaken"]=true;
profileData["planDetails"]=profileData.planId;
}
}
return callback(
false,
common.successMsg("PROFILE FETCHED",profileData )
);
}
});

I think there was missing the initialization of profileData variable only...
const profileData = {};
profileData["isPlanTaken"] = false;
console.log(profileData);
profileData["planDetails"] = {};
if(profileData.hasOwnProperty("planId") && Object.keys(profileData.planId)){
profileData["isPlanTaken"]=true;
profileData["planDetails"]=profileData.planId;
}
console.log(profileData);
And I think that is also enough to check a property is exists in an object. Can you please give me more data for example, because I don't really know what do you need.
const profileData = {};
profileData.isPlanTaken = false;
console.log(profileData);
profileData.planId = 5; // for example
if (profileData.planId) {
profileData.isPlanTaken = true;
profileData.planDetails = profileData.planId;
}
console.log(profileData);

React object property assignment only works the first time

For the following code, parameters are js objects whose structures are initialized as follows:
statePiece = {
field_name: { disabled: false, exampleValue: "arbitrary" },
field_name2: {
/* ... */
},
field_nameN: {
/* ... */
}
};
userField = "field_name_string";
sesarValues = {
format: "one2one",
selectedField: "latitude",
disabledSelf: true,
addField: 0
};
This function works correctly and returns the modified statePiece as returnTemp the first time a particular statePiece.field_name is modified
export let setUserField = (statePiece, userField, sesarValues) => {
console.log("set user field", userField, "set mappval", sesarValues);
var temp = { ...statePiece }; //(this.state.fields[each].mappedTo != null) ? (this.state.fields[userField].mappedTo) : [];
var XUnit = statePiece[userField];
if (typeof userField != "string") {
console.log("not string");
for (var each of userField) {
if (sesarValues) {
temp[each].mappedTo = sesarValues.selectedField;
temp[each].disabled = true;
} else {
temp[each].disabled = !temp[each].disabled;
delete temp[each].mappedTo;
}
}
} else {
//is string
console.log("is string");
console.log(XUnit);
if (sesarValues) {
if (XUnit.disabled === true) XUnit.disabled = false;
console.log("1");
console.log(XUnit);
XUnit.disabled = true;
console.log(XUnit);
XUnit.mappedTo = sesarValues.selectedField;
} else {
console.log("2");
temp[userField].disabled = !temp[userField].disabled;
delete temp[userField].mappedTo;
}
}
let returnTemp = { ...temp, [userField]: XUnit };
console.log("set UF debug ", returnTemp);
console.log(returnTemp["FACILITY_CODE"]);
return returnTemp;
};
But after that, changing the statePiece.userField.mappedTo value fails to alter the object property. Or at least alter it permanently. When I console log the returnTemp variable, I see the entry has lost its mappedTo entry(as should happen) without it being replaced with the new userField.
However, when I console.log(returnTemp[userField]) it shows the entry values with the expected mappedTo key: value pair.
Not sure what's going on here.

From the usage of userField, I can work out that it could be an Array or a String.
However you have done something curious with it in the following expression:
var XUnit = statePiece[userField];
Given userField is a String, the above expression is fine.
However, where it is an array, XUnit will be undefined.
Also doing the same where userField is an Array in the following line means that you're setting the userField.toString() as a key mapped to undefined.
let returnTemp = { ...temp, [userField]: XUnit };
I'd assign XUnit where the condition checks out that userField is a String and just return temp.
else {
//is string
var XUnit = statePiece[userField];
//...
}
return temp;

How do I ensure an array has no null values?

I would like test my Array (input value) before submit my form.
My array with value :
const fields = [
this.state.workshopSelected,
this.state.countrySelected,
this.state.productionTypeSelected,
this.state.numEmployeesSelected,
this.state.startAt
];
I've try this :
_.forEach(fields, (field) => {
if (field === null) {
return false;
}
});
alert('Can submit !');
...
I think my problem is because i don't use Promise. I've try to test with Promise.all(fields).then(());, but i'm always in then.
Anyone have idea ?
Thank you :)

The problem is that even though you're terminating the lodash _.forEach loop early, you don't do anything else with the information that you had a null entry.
Instead of lodash's _.forEach, I'd use the built-in Array#includes (fairly new) or Array#indexOf to find out if any of the entries is null:
if (fields.includes(null)) { // or if (fields.indexOf(null) != -1)
// At least one was null
} else {
// All were non-null
alert('Can submit !');
}
For more complex tests, you can use Array#some which lets you provide a callback for the test.
Live example with indexOf:
const state = {
workshopSelected: [],
countrySelected: [],
productionTypeSelected: [],
numEmployeesSelected: [],
startAt: []
};
const fields = [
state.workshopSelected,
state.countrySelected,
state.productionTypeSelected,
state.numEmployeesSelected,
state.startAt
];
if (fields.indexOf(null) != -1) {
console.log("Before: At least one was null");
} else {
console.log("Before: None were null");
}
fields[2] = null;
if (fields.indexOf(null) != -1) {
console.log("After: At least one was null");
} else {
console.log("After: None were null");
}

You do not need to use promises unless there is an asynchronous operation (for example if you are getting that array from your server).
If you already have that array you can do something like:
// Using lodash/underscore
var isValid = _.every(fields, (field) => (field!==null)}
// OR using the Array.every method
var isValid = fields.every((field)=>(field!==null))
// Or using vanilla JS only
function checkArray(array){
for(var i = 0; i < array.length ; i ++){
if(array[i]===null){
return false;
}
}
return true;
}
var isValid = checkArray(fields);
// After you get that value, you can execute your alert based on it
if(!isValid){
alert('Something went wrong..');
}

Try this simple snippet
var isAllowedToSubmit = true;
_.forEach(fields, (field) => {
if (!field) {
isAllowedToSubmit = false;
}
});
if(isAllowedToSubmit)
alert('Can submit !');

You can do that without library:
if (fields.some(field => field === null)) {
alert('Cannot submit');
} else {
alert('Can submit');
}

You don't need to use lodash, you can do this in simple vanilla javascript. Simply iterate over each field and if an error occurs set your errors bool to true
let errors = false;
fields.forEach(field) => {
if(field === null || field === '') {
errors = true;
}
});
if (!errors) {
alert('Yay no errors, now you can submit');
}
For an es6 you can use.
const hasNoError = fields.every((field, index, selfArray) => field !== null);
if (!hasNoError) {
alert('yay It works');
};
Have a look at Array.every documentation Array every MDN documentation

If statement not returning as supposed

I might seem really dumb but this piece of code is really frustating me.
if(fs.exist(parametters[0])){
fs.remove(parametters[0]);
return "removed";
}else{
return "doesn't exist"
}
The thing is, the fs.remove() is actually called but the function is returning "doesnt't exist", Am I missing something?
I'm not using nodejs, this is from one library i made, is asynchronously.
It's not modifying the parametters but it does change the condition, might be that?
Well I'm posting my fs object although I don't think this will change anything.
fs = {
load: function() {
if (localStorage[0] == undefined || localStorage[0] == "undefined" || localStorage[0] == "") {
localStorage[0] = JSON.stringify(fs.files);
} else {
fs.files = JSON.parse(localStorage[0]);
}
},
save: function() {
localStorage[0] = JSON.stringify(fs.files);
},
files: [],
newFile: function(name, content, overwrite) {
if (overwrite == undefined)
overwrite = true;
if (fs.exist(name) && overwrite) {
fs.find(name).content = content;
fs.save();
}
if (!(fs.exist(name))) {
fs.files.push({
name: name,
content: content
});
fs.save();
}
},
exist: function(fileName) {
for (var i = 0; i < fs.files.length; i++) {
if (fs.files[i].name == fileName)
return true;
}
return false;
},
find: function(fileName) {
for (var i = 0; i < fs.files.length; i++) {
if (fs.files[i].name == fileName)
return fs.files[i];
}
return false;
},
format: function() {
fs.files = [];
localStorage[0] = undefined;
},
write: function(name, content, overwrite) {
if (overwrite == undefined)
overwrite = true;
if (fs.exist(name) && overwrite) {
fs.find(name).content = content;
fs.save();
}
if (!(fs.exist(name))) {
fs.files.push({
name: name,
content: content
});
fs.save();
}
},
remove: function(file) {
var arrToreturn = [];
for (var i = 0; i < fs.files.length; i++) {
if (fs.files[i].name != file)
arrToreturn.push(fs.files[i]);
}
fs.files = arrToreturn;
fs.save();
return arrToreturn;
}
}
Resolved -
After a few days of inspecting the code I found the bug where the function was called twice, the amount of code was really huge so it took me a while.

You need to add a semi-colon to return "doesn't exist", it should read return "doesn't exist";

If this is an Object, still it works.
We can assume this to be an File object ARRAY, indexOf still works to find if the item exists.
Please have a look upon below example:
var fruits = ["Banana", "Orange", "Apple", "Mango"];
var a = fruits.indexOf("Apple");
Result is 2 in case Apple is found
Result is -1 in case Apple is not found
You can have some more options at this link: http://www.w3schools.com/jsref/jsref_indexof_array.asp
Thanks

Use This Code For Solving This Problam. thanks
var fs = require('fs-extra')
fs.remove('/tmp/myfile', function (err) {
if (err) return console.error(err)
console.log('success!')
})
fs.removeSync('/home/jprichardson') //I just deleted my entire HOME directory.

You can try javascript indexOf function to check if the value really exists, BEFORE REMOVE Operation.
Example below:
var str = "Hello world, welcome to the universe.";
var n = str.indexOf("welcome");
=> Gives 13 if found
if we search for "welcome1" -> will give -1

How to respond to SyntaxError in javascript

I get data back from a php server and sometimes it tosses in warnings. These warnings cause the parsing of the response to throw a syntax error which defies all try/catch code I have in place and just stops processing, leaving complex objects in partial states that can't be recovered.
How can I catch these errors? I want to have a chance to get the object back into some steady state.
Ideally, I would not receive answers stating that I should rethink architecture or change php settings. I would like to know how to respond to SyntaxErrors being thrown by JSON.parse().
Thank you,
Jeromeyers
EDIT:
It has come to my attention that the problem is more complex than I originally thought. This is the code that doesn't catch the SyntaxError:
generateSubmissionSuccessCallback: function (reloadOnSave) {
var self = this;
var submissionCallback = function(response) {
var processingError = false;
try
{
var responseObject = {};
if (self.isAspMode())
{
if (typeof response !== 'object') // Chrome auto-parses application/json responses, IE & FF don't
{
response = JSON.parse(response);
}
responseObject = {
entity: response.Payload,
success: response.Success,
message: response.Exception
};
if (jQuery.isArray(response.ValidationErrors))
{
responseObject.message += ' \r\n\r\nValidation Errors\r\n';
for (var i = 0, maxi = response.ValidationErrors.length; i < maxi; i++)
{
var error = response.ValidationErrors[i];
responseObject.message += error.Error + '\r\n';
}
}
}
else
{
responseObject = JSON.parse(response);
}
if (!responseObject || (responseObject.success !== undefined && responseObject.success !== true))
{
processingError = true;
var message = responseObject ? responseObject.message : response;
ErrorHandler.processError(
'An attempt to save failed with following message: \r\n' + message,
ErrorHandler.errorTypes.clientSide,
null,
jQuery.proxy(self.validatingAndSubmittingFinallyFunction, self));
}
else
{
// If this is a parent metaform, reload the entity, otherwise, close the metaform
if (self.metaformType === 'details')
{
if (self.substituteWhatToDoAfterSavingCallback)
{
self.substituteWhatToDoAfterSavingCallback(responseObject);
}
else if (reloadOnSave)
{
self.reloadCurrentEntity(true, responseObject.entity);
}
if (self.doesViewOutlineDefinePostSaveHook())
{
self.viewOutline.functions.postSaveHook(self);
}
}
else if (self.metaformType === 'childDetails')
{
// Reload the Grid by which this form was made
if (self.associatedGridId)
{
Metagrid.refresh(self.associatedGridId);
}
if (self.parentMetaform.associatedGridId && self.childPropertyName)
{
var annotation = self.parentMetaform.getAnnotationByPropertyName(self.childPropertyName);
if (annotation && annotation.hasPropertyOptions('updateParentMetaformAssociatedGrid'))
{
Metagrid.refresh(self.parentMetaform.associatedGridId, self.parentMetaform.entityId);
}
}
if (self.substituteWhatToDoAfterSavingCallback)
{
if (self.doesViewOutlineDefinePostSaveHook())
{
self.viewOutline.functions.postSaveHook(self);
}
self.substituteWhatToDoAfterSavingCallback(responseObject);
}
else
{
if (self.doesViewOutlineDefinePostSaveHook())
{
self.viewOutline.functions.postSaveHook(self);
}
self.disposeMetaform();
}
}
}
}
catch (ex)
{
processingError = true;
ErrorHandler.processError(
"Please immediately inform the authorities that: \r\n\r\n" + typeof response === 'string' ? response : JSON.parse(response) + "\r\n\r\nand:\r\n\r\n " + ex.message,
ErrorHandler.errorTypes.clientSide,
null,
jQuery.proxy(self.validatingAndSubmittingFinallyFunction, self));
}
finally
{
// If we are reporting an error to the user then we can't reset these state variables
// because in the case where this is a child form, the parent will close the form
// before the user has read the error.
if (!processingError)
{
self.validatingAndSubmittingFinallyFunction();
}
}
};
return jQuery.proxy(submissionCallback, self);
}
There's really a lot going on in there, and a lot of structure that it fits into. I don't know if including it will really help.

Assuming you are talking about JSON and it raising an error (and not actual JavaScript being served to the page):
var data;
try{
data = JSON.parse(jsonString);
}catch(e){
// handle the error here, if you like
}
if (typeof data !== "undefined"){
// Yay, we got some!
}
Read more about try...catch at MDN.
For example (from Chrome's console):
> try{ JSON.parse('3/') }catch(e){ console.log('oh no!') }; console.log('OK!')
"oh no!"
"OK!"