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Collecting values in array and pass it to php

I have these checkboxes with value in them that I would like to store and pass to php.
my function suppose to check each one of them and evaluate if thy're checked or not and then push/remove them from the array:
function isChecked(){
let distributionEL = document.querySelector("[name='distribution']");
console.log(distributionEL.value);
sendingLists.forEach(function(list) {
let sendSMSArr = distributionEL.value.split(',');
if(list.checked == true){
sendSMSArr.push(list.value);
} else {
let index = sendSMSArr.indexOf(list.value);
if (index > -1) {
sendSMSArr.splice(index, 1);
}
distributionEL.value = sendSMSArr.join(',');
});
}
What happens now is that the function repeats the existing elements of the array and then adds the new value like so. let's say my array looks like this:
sendSMSarr = ['1','2']
and after if do .push to the new value '3':
sendSMSarr = ['1','2','1','2','3']
I would like to store those values without duplicates.
As for some other data in here:
isChecked() is invoked after the loading of the page and after every search. you can search for those checkboxes in a search bar. after every search the entire div is emptied (div.innerHTML = '') and then filled with the results.
then:
// call func after every search
listR.addEventListener('change', function(){
isChecked();
})
The distributionEL is an hidden input which I use to store the values I need in a string in order to pass it to php and later convert to array agian so I can loop through it.
sendinglist is all the checkboxes in my page (document.querySelector(.checkboxes))
Manage to Isolate the problem:
Each checkbox is added when checked and removed when unchecked separately but when I check a few together without unchecking the others its start to duplicate. Obviously I would like to be able to do that without unchecking

How to get checkbox value from localStorage

There is a page with a lot of different checkbox questions which then get submitted and populate the next page, this page however gets refreshed and the already annoyed potential client needs to go back and fill out the form again.
Now I have localstorage set up so he doesn't need to reselect all the checkbox again, he just needs to resubmit the form and his back in action.
How does one keep the values populated on the problem page so this fella doesn't have to go back to resubmit?
//SIZE SAVE
function save() {
localStorage.setItem('100', checkbox.checked);
var checkbox = document.getElementById('100');
localStorage.setItem('200', checkbox.checked);
var checkbox = document.getElementById('200');
//SIZE LOAD
function load() {
var checked = JSON.parse(localStorage.getItem('100'));
document.getElementById("100").checked = checked;
var checked = JSON.parse(localStorage.getItem('200'));
document.getElementById("200").checked = checked;
//THIS PAGE NEEDS THE CHECKMARK
echo get_site_url().
"/the/checkmark/selected/was/".$_POST['check_group'].
"/.png";
}

I think is much simple for now and especially for the feature if you write some code to make the management for all checkboxes form your form.
First of all it will be best if you group all your checkboxes into a single place.
Into a function like this you can declare all your checkbox selectors you want to save into the localStoarge (now you don't need to make variables for each selector into multiple places into your code)
function getCheckboxItems() {
return ['100', '200']
.map(function(selector) {
return {
selector: selector,
element: document.getElementById(selector)
}`enter code here`
});
}
Then to make things much simpler you can store all the values from the checkbox into a single object instead of save the result in multiple keys, in this way is much simpler to make management (let's say you want to erase all values or to update only a part)
The following function will take as argument all checkbox items from the function above, the point is the function above will return an array with the checkbox id and the checkbox element, than you just reduce all that array into this function into an single object containing all the ids and values, after this you just store the object into the localStorage
function serializeCheckboxes(elements) {
var container = elements.reduce(function (accumulator, item) {
accumulator[item.selector] = item.element.checked;
return accumulator;
}, {})
localStorage.setItem('container', JSON.stringify(container));
}
function save() {
var elements = getCheckboxItems();
serializeCheckboxes(elements);
}
After this you need another function who will read all the values from the localStorge and place them into your checkbox "checked" state
function readCheckboxes() {
var storage = localStorage.getItem('container'), //Your key
container = (storage) ? JSON.parse(storage) : {};
Object.keys(container).forEach(function(key) {
var element = document.getElementById(key);
if(element) {
element.checked = container[key];
}
});
}
This is just a simple service who can manage your problem but I think, for any additional changes you can customize this solution much simpler instead of keeping all into multiple variables, also if you add more checkbox elements into your application with this solution you just add the corresponding id into the array from the first function.
A live example here:
https://jsbin.com/xejibihiso/edit?html,js,output

localStorage has two main functions, getItem and setItem. For setItem you pass in a key and a value. If you write to that key again, it will rewrite that value. So in your case, if a box is checked you would do
localStorage.setItem("checkbox_value", true)
and when it is unchecked you would pass in false instead. To get the value you can look at using jQuery like so:
$(checkbox).is(':checked')
and use a simple if-else clause to pass in true or false. then when you reload your page, on $(document).ready() you can get the values using
localStorage.getItem(key)
and use JavaScript to set the check boxes values.
localStorage only allows you to store strings. What you can do is use a loop to create a string that has all the check boxes values separated by some delimiter. So, for example, if there are four check boxes with values true false false true your string would be "true\nfalse\nfalse\ntrue" where \n is the delimiter. then you can store that string in localStorage and when you retrieve it you can put all the values into an array like so:
array = localStorage.getItem(key).split('\n').
Then you can populate your check boxes with that newly retrieved array. Ask if anything needs clarification.

Change the div's in another html page

still learning some javascript here, got done other things but now the final and most important part of it.
I have two html pages - one of which uses javascript to dynamically add text-fields (and to remove them of course) (genmain.html) and the other one where the text field input should go(table.html).
So i have already created a function to retrieve the array of values.
function getElementArray(divName){
var names = document.getElementsByName("namefield");
}
The variable names is an array and it has all the values from fields.
The problem is I would like to set these values from array to the values of another div on the page. After some searching i understood that it could be done with 'id'-s but i'm not that sure and don't completely understand how.
Let's say i have a lot of div's on another page (table.html) but some of them have id="MAIN". I would like to change the value inside of the div
For example
<div id="MAIN">THIS PART I WANT TO CHANGE</div>
Javascript is not part of my school system and i've done CodeAcademy tutorials and that's the most i've got about this, I hope you guys can help with my issue.

The variable names is an array and it has all the values from fields.
function getElementArray(divName){
var names = document.getElementsByName("namefield");
}
Nope, you've only got reference to the elements here. You've not got the value yet.
You can get the values by iterating through the names Nodelist array and use names[i].value
The problem is I would like to set these values from array to the
values of another div on the page
If it's going to be in same page, then use innerHTML or textContent property of the DOM to assign the value.
document.getElementById("MAIN").textContent= names[1].value;
Just for demo purpose am using names[1] here so it will load the second input value.
Let's say i have a lot of div's on another page (table.html) but some
of them have id="MAIN". I would like to change the value inside of the
div
Once you move to another page, the javascript state will be lost. So you wont have access to names inside that page.
Either you must store the values into localStorage and retrieve in next page.
Else add the values to query string of your URL and retrive it there.
Edit: Update based on comments
Let us assume you have var names = document.getElementsByName("namefield"); so to store the values inside localStorage.
var myValues = [],
names = document.getElementsByName("namefield");
for(var i = 0; i < names.length; i++) {
myValues.push(names[i].value);
}
localStorage.myValues = JSON.stringify(myValues);
Now if your next page, Iinside window.onload event:
window.onload = function() {
var myValues = localStorage.getItem("myValues") ? JSON.parse(localStorage.getItem("myValues")) : [],
divElements = document.querySelectorAll("#MAIN");
for(var i =0; i < myValues.length; i++) {
divElements[i].textContent = myValues[i];
}
}

If you want to set or change the contents of an element, you can use the innerHTML property.
So in your case, document.getElementById("MAIN").innerHTML = "Whatever you want";
For the record, names in your example technically isn't an array, but a NodeList. See https://developer.mozilla.org/en/docs/Web/API/NodeList#Why_is_NodeList_not_an_Array.3F.

EmberJS - Prevent record with duplicate attributes being added to store

My first question here so please accept my apologies if this has been asked before and/or I am making some newbie mistake!
I am trying to get my head around EmberJS with a simple exercise. I am trying to create a list of keywords and I have the basic functionality working. I wish to allow the user to enter a comma separated list of keywords to the store, however, alert if the keyword is a duplicate.
So I have an ArrayController with an Actions object and within which I have a createKeyword function.
createKeyword: function() {
// Get the keyword title set by the "New Keyword" text field
var entered_value = this.get('newKeyword');
if (!entered_value) { return false; }
if (!entered_value.trim()) { return; }
var entered_values = entered_value.split(",");
for ( var i=0; i<entered_values.length; i++){
var value = entered_values[i];
value = value.replace(/\+|"|'/g," ");
if ( ! value.trim() ){
continue;
}
value = value.toUpperCase();
alert( "Prior addition:" + this.get('length'));
// Prevent duplicates being added
if ( this.findBy('keyword',value) === undefined ) {
// Create the new Keyword model
var keyword = this.store.createRecord('keyword', {
value: value,
weighting: 1,
isNew: true
});
// Save the new model
keyword.save();
alert( "post addition:" + this.get('length') );
}
else {
alert( "Keyword [" + value + "] already defined");
}
}
// Clear the "New Keyword" text field
this.set('newKeyword', '');
}
I have a couple of alerts in there - one to display the array controller's length before I check for the value and subsequently createRecord on the store and one after. So I run this with 3 records, say 'tom','dick','harry' and if I add 'fred' to it, first alert is 3 and second alert is also 3 and fred appears.
I am confused as to why the 2nd alert is showing 3 and not 4 - I am assuming (perhaps incorrectly) that the arrayController has not yet been updated with the new record.
Secondly, if I restart then try adding fred,dick as an input, both get added, I would have thought fred should have been added and dick rejected as it was a duplicate.
Thanks in advance for any suggestions.
Jon

Judging by the way you wrote your code and that you use an 'ArrayController, I'm going to assume that the model for this particular route is all of your keywords. So themodel` hook is probably:
model: function() {
return this.get('store').findAll('keyword');
}
Assuming that, I think I can answer your questions.
First, the length doesn't change when you create the new record. It should increment from 3 to 4, but it doesn't. You are correct in assuming that the bindings haven't had time to update yet. You added the new record to the store, but the store hasn't had time to update the model for your controller yet because you still have control of the program flow. Most bindings are updated asynchronously in the run loop, so for many scenarios in Ember, you can't expect immediate updates.
Secondly, as for duplicates being added, it's hard to say but I think it's because you have a logic error.
// Prevent duplicates being added
if ( this.findBy('keyword',value) === undefined ) {
It seems to me as if you mistakenly put keyword instead of value. This might be just a typo when you were typing this question, but based on how you created your model, keyword is the type and value is the property.
Finally, a quick note: you shouldn't override the isNew property like you do when creating the new keyword. That will actually override the Ember-Data property with a permanent true value. (At least that's how I remember it working. I might be wrong, but it doesn't matter.) isNew is a computed property created by Ember-Data that will automatically update when the state of the object changes. Don't worry about setting it manually; just use the record as you normally would and Ember-Data will take care of the rest.

how do I create list of unique values and systematically store them in localstorage

I'm trying to build a history list of clicked clicked page elements and store that list into HTML local storage, to be later displayed back to the user. The main pre-requisite is that the list cannot contain duplicates, so for example if the user clicks on item A and then on item B and again back on item A, only A and B are recorded. The third click is not recorded because it is not unique.
I'm also using persist.js.
I noticed that I am able to name the storage and give it a key and both are stored together in the real key of the localstorage thus: myStorageName>myKeyand my value is whatever I put there.
Here's the thing. I know you can store stringyfied JSON there but my list is built up from simple javascript variables one at at time.
I know what to do for the first click:
myStorageName.set(myKey, myCurrentElementId); // myCurrentElementId = this.id
now on the second click this is where I'm beginning to getting stuck. There is the original variable value already stored, now I want to append the new variable value. Assume that I can get the value from the store like this:
var dataExtract = myStorageName.get(myKey);
myObject = JSON.parse(dataExtract);
But how do I then turn this into a JSONstring -able thing (sorry I don't even know what it should be) that contains only a list of unique values. Does this make any sense to anyone?

First of all, you don't want to keep writing to/from localStorage everytime a link is clicked, because this'll slow down your page. Keep an updated Array populated with the element ids, then write to localStorage before the user navigates away from the page (by binding to the window's onbeforeunload event, for instance).
First:
var clickedLinks = []; // this Array will hold the ids of the clicked links
function uniqueClick(id){
return !~clickedLinks.indexOf(id); // this tests whether the id is already in the Array
};
In your click handler:
if(uniqueClick(this.id)){
clickedLinks.push(this.id); // append the new element id to the Array
}
Bind to window.onunload to save the Array before the user navigates from the page:
window.onunload = function(){
localStorage.setItem('clickedLinks',JSON.stringify(clickedLinks)); // stringify the Array and save to localStorage
}
To retrieve clickedLinks on subsequent page visit:
// convert the String back to an Array; try/catch used here in case the value in localStorage is modified and unable to be parsed, in which case clickedLinks will be initialized to an empty Array
try{
var clickedLinks = JSON.parse(localStorage.getItem('clickedLinks')) || [];
}catch(e){
var clickedLinks = [];
}
You may want to replace the first line (var clickedLinks = [];) with this last bit of code, as it will initialize the Array if it doesn't exist.
UPDATE:
IE8 does not support Array.indexOf. Alternatives might be:
use jQuery's $.inArray by replacing !~clickedLinks.indexOf(id); with !~$.inArray(id, clickedLinks);
Detect whether Array.prototype.indexOf is supported. If not, shim it with the code provided on this page.

Your model has an error. At the first time, you save a primitive value. Then, you want to "append" another value to it. Seems like you actually want to use an object:
var myObj = localStorage.getItem("myName");
if(myObj) myObj = JSON.parse(myObj); //Variable exists
else myObj = {}; //Elsem create a new object
function appendNewValue(name, value){
myObj[name] = value;
localStorage.setItem("myName", JSON.stringify(myObj));
/* Saves data immediately. Instead of saving every time, you can
also add this persistence feature to the `(before)unload` handler. */
}

I suggest to define in your code this:
localStorage.set= function(key,val)
{
localStorage.setItem(JSON.stringify(val));
}
localStorage.get = function(key,defval)
{
var val = localStorage.getItem(key);
if( typeof val == "undefined" ) return defval;
return JSON.parse(val);
}
and use them instead of get/setItem. They will give you ready to use JS values that you can use in the way you need.