Develop Reference

How to find an object key using an variable?

What I want is that my object listen to a string that I send to my function
for example :
const [object,setobject] = useState([]);
const HandleChange = (text,field) => {
if (Object.keys(object).length > 0){
var objects = values + ',' + '{"' +field +'":' + text + '}'
console.log(object[text])
setobject(objects);
}
else {
var objects = '{"' + field +'":' + '"'+ text + '"}'
setobject(objects);
console.log(object[field]);
}
}
from this object(which is a state) I want to get if there is any value equal to variable text inside my object, someone knows how can I find it ?

It seems there several typos in your code (object or objects, console.log(object[text]) or console.log(object[field]), ...).
What I understand is that you wish to access object[field], but object is a String and not an Object.
Following this premise I would suggest converting it to an actual Object first, using JSON.parse(). Then you could check if object[field] already exists.

Searching For Existing Values in Array

I have been trying to search for an existing value in an array like below
var values = []
values.push(localStorage.getItem('items'));
console.log(values);
if (values.includes(2)) {
alert('Already Exists.');
}
When i console the array values i have output as ["1,2,3,4,5,6"] so the code treats the array as having just one index which is index[0] which makes the search quite challenging for me.
My challenge is how to find the value 2 in the array values ?

localStorage can only hold strings. As such you need to convert the value you retrieve in to an array, which can be done using split().
Also note that the resulting array will contain string values, so you need to use includes('2'). Try this:
var values = "1,2,3".split(','); // just for this demo
//var values = localStorage.getItem('items').split(',');
console.log(values);
if (values.includes("2")) {
console.log('Already Exists.');
}

Hope this help you.
var names_arr = '["1,2,3,4,5,6"]';
names_arr = names_arr.replace("'",'');
function checkValue(value,arr){
var status = 'Not exist';
for(var i=0; i<arr.length; i++){
var name = arr[i];
if(name == value){
status = 'Exist';
break;
}
}
return status;
}
console.log('status : ' + checkValue('3', names_arr) );
console.log('status : ' + checkValue('10', names_arr) );

First of all, this isn't jQuery, it's vanilla JS.
Second, after doing localStorage.setItem("items", [1,2,3,4,5,6]);, items in local storage will equal to "1,2,3,4,5,6", which is no longer the appropriate format.
Rather, save your array with localStorage.setItem("items", JSON.stringify([1,2,3,4,5,6]));. When you want to retrieve those items, write let vals = JSON.parse(localStorage.getItem("items"));, and search in vals with
vals.includes(2) for a true/false answer,
vals.find(val => val === 2) for 2 or undefined,
val.indexOf(2) to get the index of the
first element equal to 2.
Hope this helps.

firstly get the values from local storage store it in a variable, split it using the split
function, then check if the number is inside the array, alert the message if it returns true
var values =localStorage.getItem('items')
var spliter = values.split(',')
console.log(spliter);
if (spliter.includes('2') == true) {
alert('Already Exists.');
}

Get multiple values from hash in URL

www.domain.com/lookbook.html#look0&product1
On page load I would like to grab the whole hash ie. #look0&product1
then split it up and save the number of the look ie 0 in a variable called var look and the number of the product ie 1 in another variable called var product. Not sure how to achieve this.
Is this also the best way of passing and retrieving such parameters? Thanks

Use var myHash = location.hash to get hash part of URL. Than do var params = myHash.split('&') and after that for each part do part.split('=') to get key-value pairs.
Maybe it's better to pass these parameters via GET from PHP side and than post them inside page when page is processed via PHP?
<input type="hidden" name="look" value="<?php echo isset($_GET['look']) ? $_GET['look'] : '';?>"/>

Here's the pure Javascript method:
function parseHash(hash) {
// Remove the first character (i.e. the prepended "#").
hash = hash.substring(1, hash.length);
// This is where we will store our properties and values.
var hashObj = {};
// Split on the delimiter "&" and for each key/val pair...
hash.split('&').forEach(function(q) {
// Get the property by splitting on all numbers and taking the first entry.
var prop = q.split(/\d/)[0];
// Get the numerical value by splitting on all non-numbers and taking the last entry.
var val_raw = q.split(/[^\d]/);
var val = val_raw[val_raw.length - 1]
// If the property and key are defined, add the key/val pair to our final object.
if (typeof prop !== 'undefined' && typeof val !== 'undefined') {
hashObj[prop] = +val;
}
});
return hashObj;
}
Use like:
parseHash(window.location.hash /* #book10&id1483 */)
/* returns: Object {book: 10, id: 1483} */
I suggest using the norm for passing values through the location's hash: prop=value. Ex: #book=10&id=311. Then you can easily split on = for each property.

You can use .match(re) method with use of regular expression to extract the number from the given string.
You can try this:
var hashes = location.hash.split('&'); // get the hash and split it to make array
var values = hashes.map(function(hash){ // use .map to iterate and get a new array
return hash.match(/\d+/)[0]; // returns the numbers from the string.
});
var loc = "look0345345345&product1";
var hashes = loc.split('&');
var values = hashes.map(function(hash){ return hash.match(/\d+/)[0]; });
document.body.innerHTML = '<pre>'+ JSON.stringify(values) + '</pre>';

You could try this:
var url = 'www.domain.com/lookbook.html#look0&product1'
, result = {}
, expr = RegExp(/[#&]([a-zA-z]+)(\d+)/g);
var parts = expr.exec(url);
while(parts != null && parts.length == 3) {
result[parts[1]] = parts[2];
parts = expr.exec(url);
}
var look = result['look']
, product = result['product'];
document.getElementById('result').innerHTML = 'look = ' + look + '<br>' + 'product = ' + product;
<p id='result'></p>
We are basically using a regular expression to divide the parameter name and value into two groups that we can then get by calling expr.exec(url).
Each time we call expr.exec(url), we get the next set of name and value groups.
We set the value of the parameter to its name in the result object.
In the regular expression /[#&]([a-zA-z]+)(\d+)/g, the g after the /.../ means match each time find the two groups.
The two groups are prefaced by either & or # ([#&]). The first group is a String of letters ([a-zA-z]+), the name of the parameter. The second is a String of numbers (\d+), the value you are looking for.
The regex returns the String that matches the pattern as the first result in the parts array, followed by the groups matched, which which means that our two groups in each iteration will be parts[1] and parts[2].

you should use:
function parseHash(hash){
hash = hash.substring(1, hash.length); //remove first character (#)
var obj ={}; //create the output
var qa = hash.split('&'); //split all parameters in an array
for(var i = 0; i < qa.length; i++){
var fra1 = qa[i].split('='); //split every parameter into [parameter, value]
var prop = fra1[0];
var value = fra1[1];
if(/[0-9]/.test(value) && !isNaN(value)){ //check if is a number
value = parseInt(value);
}
obj[prop] = value; //add the parameter to the value
}
return obj;
}
document.querySelector("input.hash").onkeyup = function(){
console.log( parseHash(document.querySelector("input.hash").value));
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="text" class="hash"/>
<p class="output"></p>
use as
parseHash(location.hash /* #look=0&product=1 );
/returns {look: 0, product: 1}/

jQuery traverse json recursive

I am trying to traverse a JSON object with jQuery recursive.. normally it worked , but not on the following JSON.
I want to traverse this JSON, here I uploaded an image:
For my json objects, i had this jquery function:
var construct_id = "#ecommerce_form_";
// function to traverse json objects given back from Serializer class
function process(callback, id) {
var key;
for (key in callback) {
// Handle the arrays
if ('length' in callback[key]) {
// Handle the end - we found a string
if (typeof callback[key][0] == "string") {
var field_id = construct_id + id + key;
var err_msg = callback[key][0];
$(field_id).tooltip('destroy');
$(field_id).tooltip({'title': err_msg});
$(field_id).closest('div[class="form-group"]').addClass('has-error');
console.log(field_id, ":", err_msg);
}
// Else we found something else, so recurse.
else {
var i = 0;
while (i < callback[key].length) {
process(callback[key][i], key + "_" + i + "_");
i++;
}
}
}
// Handle the objects by recursing.
else {
process(callback[key], key + "_");
}
}
}
But that functions fails when trying to build the contact > addresses id with the error message:
"Uncaught TypeError: Cannot use 'in' operator to search for 'length'
in This value should not be blank."
Hope you guys can help me enhancing the jQuery function, it is not 100% successfull as you can see on this json example.
Regards

You are trying to search for the property "length" in a string, which can't be done. In the erroneous iteration: callback = obj.contacts.addresses, key = cities and then callback[key][0] = "This value should not be blank".
What you should do is check if you have reached a string before looking for the "length" property, and only then if you haven't found a string, begin the recursion check.
see jsfiddle example here:
http://jsfiddle.net/38d15z4o/
var construct_id = "#ecommerce_form_";
// function to traverse json objects given back from Serializer class
function process(callback, id) {
var key;
for (key in callback) {
// Handle the end - we found a string
if (typeof callback[key] == "string") {
var field_id = construct_id + id + key;
var err_msg = callback[key][0];
$(field_id).tooltip('destroy');
$(field_id).tooltip({'title': err_msg});
$(field_id).closest('div[class="form-group"]').addClass('has-error');
console.log(field_id, ":", err_msg);
}
// Handle the objects and arrays by recursing.
else {
process(callback[key], id + key + "_");
}
}
}
NOTE: for the error message, you are only showing the first letter of the string, I think you meant to put: err_msg = callback[key] not err_msg = callback[key][0].

Why don't you check for
typeof callback[key] === 'array'
Instead checking the length property?

chrome.storage.local.get results in "Undefined" when called

I'm building a chrome extension, and I needed to save some data locally; so I used the Storage API . I got to run the simple example and save the data, but when I integrated it with my application, it couldn't find the data and is giving me "Undefined" result.
Here is my Code:
function saveResults(newsId, resultsArray) {
//Save the result
for(var i = 0; i < resultsArray.length; i++) {
id = newsId.toString() + '-' + i.toString();
chrome.storage.local.set({ id : resultsArray[i] });
}
//Read and delete the saved results
for(var i = 0; i < resultsArray.length; i++) {
id = newsId.toString() + '-' + i.toString();
chrome.storage.local.get(id, function(value){
alert(value.id);
});
chrome.storage.local.remove(id);
}
}

I am not certain what type of data you are saving or how much, but it seems to me that there may be more than one newsId and a resultsArray of varying length for each one. Instead of creating keys for each element of resultsArarry have you considered just storing the entire thing as is. An example of this would be:
chrome.storage.local.set({'results':[]});
function saveResults(newsId, resultsArray) {
// first combine the data into one object
var result = {'newsId':newsId, 'resultsArray':resultsArray};
// next we will push each individual results object into an array
chrome.storage.get('results',function(item){
item.results.push(result);
chrome.storage.set({'results':item.results});
});
}
function getResults(newsId){
chrome.storage.get('results', function(item){
item.results.forEach(function(v,i,a){
if(v.newsId == newsId){
// here v.resultsArray is the array we stored
// we can remove any part of it such as
v.resultsArray.splice(0,1);
// or
a.splice(i,1);
// to remove the whole object, then simply set it again
chrome.storage.local.set({'results':a});
}
});
});
}
This way you don't need to worry about dynamically naming any fields or keys.

First of All thanks to Rob and BreadFist and all you guys. I found out why my code wasn't working.
Storage.Set doesn't accept the key to be an 'integer' and even if you try to convert that key to be a 'string' it won't work too. So I've added a constant character before each key and it worked. Here's my code.
function saveResults(Id, resultsArray) {
var key = Id.toString();
key = 'a'.key;
chrome.storage.local.set({key : resultsArray});
}
function Load(Id) {
var key = Id.toString();
key = 'a'.key;
chrome.storage.local.get(key, function(result){
console.debug('result: ', result.key);
});
}