I am using knockout where I get my JSON object using Ajax. My question is how do I use this data in my own javascript code:
I have my mapped item, which is what I get returned from the ajax.
Example:
MedarbejderId: ko.observable(element.MedarbejderId),
MedarbejderId is the Id I need to find the name in my following method.
function TranslateMed(i)
{
console.log("test " + i) // for testing purposes in console.
for (var key in obj)
{
if (obj[key].Value == i)
{
console.log("vi er inde");
return obj[key].Text;
}
}
return obj[0].Text
}
obj is my List of names. this works fine. My issue comes when i save the Data,
$(document).on("click", ".kout-update", null, function (ev) {
var current = ko.dataFor(this);
console.log(current);
current.MedarbejderNavn = TranslateMed(current.MedarbejderId);
current.Mode("display");
saveData(current);
});
here my current.MedarbejderId is c(){if(0<arguments.length)return c.Ua(c[F],arguments[0])&&(c.ia(),c[F]=arguments[0],c.ha()),this;a.l.sc(c);return c[F]}
I need to get the Value of it instead.
The solution i found was that i needed to treat
current.MedarbejderNavn = TranslateMed(current.MedarbejderId);
Diffrently, so when i changed it to:
current.MedarbejderNavn = TranslateMed(current.MedarbejderId());
Related
Not sure where to start with this one... I'm creating a basic todo app, using localStorage. (I specially, am not using a backend database).
So far, I can update and display, the objects I have stored locally. And I am displaying them on my page.
form.addEventListener('submit', function(e){
e.preventDefault();
// Set object
let data = {
name: nameInput.value,
url: urlInput.value
};
bookMarksArray.push(data);
console.log("Added bookmark #" + data);
// Saving
localStorage.setItem("bookMarksArray", JSON.stringify(bookMarksArray));
});
However, I also want to able to edit, each item in my DOM. Once edited, I want that specific object, which correlates to this, to be updated in localStorage.
How do I do this?
I'm not sure where to start. Here's a codepen, of my code so far:
https://codepen.io/ReenaVerma1981/pen/LYEPbjL
EG
- if I want to update a URL value to www.google.co.uk
- And this is updated, in the correct object, in localStorage
Here's some psuedo code, is this a good approach?
// List each object as an individual form in DOM
// So I can easily update the input.value, (with a new value)
// The **edit** button, would be a submit button
// Or there's an eventHandler on this button
// Which onClick, takes the input.value, (either name.value or url.value)
// Identifies whether these values, match values in the localStorage object
// And if so, get the object index
// Then update these object values, based on the object index?
// Update localStorage via localStorage.setItem
Here's some example code, I'm writing, to try and do this:
// UPDATE/EDIT EXISTING
const list = document.querySelector('.url-list');
list.addEventListener('click', event => {
if (event.target.classList.contains('js-edit-url')) {
console.log('edit');
const editName = event.target.parentElement.name.value;
const editURL = event.target.parentElement.url.value;
let data = {
name: editName,
url: editURL
};
Object.keys(bookMarksArray).map(function (old_key, index) {
// console.log('old_key',old_key);
let new_key = data;
console.log('data', data);
if (old_key !== new_key) {
Object.defineProperty(bookMarksArray, new_key,
Object.getOwnPropertyDescriptor(bookMarksArray, old_key));
// console.log('bookMarksArray',bookMarksArray);
// localStorage.setItem("bookMarksArray", JSON.stringify(bookMarksArray));
delete bookMarksArray[old_key];
}
});
}
});
I figured it out!
I found a really good example here, using the ES6 way, without mutating original data:
// UPDATE/EDIT EXISTING
const list = document.querySelector('.url-list');
list.addEventListener('click', event => {
if (event.target.classList.contains('js-edit-url')) {
console.log('edit');
const editName = event.target.parentElement.name.value;
const editURL = event.target.parentElement.url.value;
// Find the object index, by looping through and matching name.value
const objIndex = bookMarksArray.findIndex(obj => obj.name === editName);
// make new object of updated object.
const updatedObj = { ...bookMarksArray[objIndex], url: editURL};
// make final new array of objects by combining updated object.
const updatedProjects = [
...bookMarksArray.slice(0, objIndex),
updatedObj,
...bookMarksArray.slice(objIndex + 1),
];
localStorage.setItem("bookMarksArray", JSON.stringify(updatedProjects));
}
});
I have the following problem: I want to get data from a specific node from firebase during runtime. It should display "stats" of a player that was selected before. Now I could use on() to get all the data in the beginning, but I want to save data transfers by only downloading the data of on player if I need to, so I tried to use once like this:
var firebaseRef = firebase.database().ref();
function getScoresOfPlayer(player) {
console.log(player);
var selectedPlayerScores = [];
firebaseRef.once('value').then(function(snap) {
snap.child('scores').child('thierschi').forEach(function(child) {
selectedPlayerScores.push([child.key, child.val()]);
});
});
return selectedPlayerScores;
}
The problem is that it retruns the array before the data was loaded into it. Also I checked the docs and didn't find a better solution.
Thanks in advance!
This is because the getScoresOfPlayer function returns selectedPlayerScores before the promise returned by the once() method resolves.
You should include the return within the then(), as follows:
var firebaseRef = firebase.database().ref();
function getScoresOfPlayer(player) {
console.log(player);
var selectedPlayerScores = [];
return firebaseRef.once('value') //return here as well
.then(function(snap) {
snap.child('scores').child(player).forEach(function(child) { //I guess it should be child(player) and not child('thierschi') here
selectedPlayerScores.push([child.key, child.val()]);
});
return selectedPlayerScores;
});
}
which means that you have to call your function as follows, since it is going to be asynchronous and to return a promise:
getScoresOfPlayer('xyz')
.then(function(selectedPlayerScores) {
....
})
I'm trying to represent multiple selects with its selected values from backend JSON to knockout view model.
And it's needed to retrieve this JSON when each select is changed, first time - all is ok, but if I apply mapping again (ko.mapping.fromJS(test_data, ViewModel)), all subscriptions are lost does anyone know how to avoid this situation?
jsfiddle (I don't know why selects don't have its values, without jsfiddle - all is ok):
http://jsfiddle.net/0bww2apv/2/
$(ViewModel.attributes()).each(function(index, attribute) {
attribute.attribute_value.subscribe(function(name) {
console.log('SUBSCRIBE', name);
var send_data = {};
$(ViewModel.attributes()).each(function (index, attribute) {
send_data[attribute.attribute_name.peek()] = attribute.attribute_value.peek();
if (attribute.attribute_value() === null) {
send_data = null;
return false;
}
});
if (send_data) {
console.log('REQUEST TO BACKEND: ', ko.toJSON(send_data));
ko.mapping.fromJS(test_data, ViewModel);
// subscriptions is lost here !
}
});
});
At last I've solved my own question with knockout.reactor plugin,
If we remove all auxiliary constructions, it will look like:
var ViewModel = ko.mapping.fromJS(test_data);
ko.applyBindings(ViewModel);
ko.watch(ViewModel, { depth: -1 }, function(parents, child, item) {
// here we need to filter watches and update only when needed, see jsfiddle
ko.mapping.fromJS(test_data2, {}, ViewModel);
});
This way we update selects and don't have troubles with subscription recursions.
full version (see console output for details): http://jsfiddle.net/r7Lo7502/
I'm trying to store an object in my chrome extension containing other objects using chrome.storage - but am having trouble initializing it and properly fetching it using chrome.storage.sync.get. I understand that I'm supposed to get objects in the form of chrome.storage.sync.get(key: "value", function(obj) {} - the issue is I'm not sure how to
Initialize the object the first time with get
Properly update my object with set
I have the following code to create the object and add the data I need.
allData = {};
currentData = {some: "data", goes: "here"};
allData[Object.keys(allData).length] = currentData;
This will correctly give me an object with it's first key (0) set to currentData. (Object: {0: {some: "data", goes: "here"}}) Working as intended, and allData[Object.keys(allData).length] = currentData; will properly push whatever currentData is at the time into my Object later on.
But how do I properly store this permanently in chrome.storage? chrome.storage.sync.get("allData", function(datas) {}) fails to create an empty allData variable, as does allData: {}, allData = {}, and a variety of different things that return either undefined or another error. How do I properly initialize an empty object and store it in chrome.storage? Or am I going about this all wrong and need to break it down into associative arrays in order for it to work?
I essentially need that small block of working code above to be stored permanently with chrome.storage so I can work with it as needed.
You first need to set the data inside the storage:
allData = {};
currentData = {some: "data", goes: "here"};
// to initialize the all data using the storage
chrome.storage.sync.get('allData', function(data) {
// check if data exists.
if (data) {
allData = data;
} else {
allData[Object.keys(allData).length] = currentData;
}
});
// Save it using the Chrome extension storage API.
chrome.storage.sync.set({'allData': allData}, function() {
// Notify that we saved.
message('Settings saved');
});
After that you should be able to access the data using the chrome.storage.sync.get('allData', function(){ ... }) interface.
You can easily do this with the new JavaScript (ECMAScript 6), have a look into Enhanced Object Properties:
var currentData = {some: "data", goes: "here"};
chrome.storage.local.set({allData: currentData });
In the old way, was something like this:
var obj = {};
var key = "auth";
obj[key] += "auth";
obj[key] = JSON.stringify({someKey: someValue});
Good day everyone,
I am pulling back some data from a database (via a PHP script) using jQuery's .getJSON() method. This is all well and good, the data comes back just fine and as expected. The problem occurs when I try to pass the data to a secondary function, no matter how I try to access the values of that data they come back as undefined. I have a feeling I am overlooking something very simple but after a lot of trial and error I come to SO asking for an extra set of eyes.
Here is a simple example of the JavaScript code.
function fnCheck_Vis(Row, sField, sMode)
{
sField = sField+"_vis";
sTest = Row.sField.val();
alert(sTest); // Comes back as undefined.
}
$(document).ready(function()
{
$("#btnSearch").click(function()
{
$("#divResults").empty();
var ssearch = $("#ssearch").val();
var i = 0;
$.getJSON("get_results.php?keywords=" + ssearch,
function(Data)
{
var iRec = 0;
$.each(Data, function(i, Row)
{
fnCheck_Vis(Row, "slinkpic1", "Int");
var content = Row.slast;
$("#divResults").append(content);
iRec++;
});
alert(iRec + " records retrieved using AJAX.");
});
});
});
The first piece of the fnCheck_Vis() function works fine and "_vis" is appended to the field name, this is proper behavior. No matter how I try to access that member in the dataset (Row) I can not get a value back.
I really appreciate any insight that can be given on this issue.
Thanks,
Nicholas
It looks like you want to access the property of Row whose name is stored in sField, not its actual sField property. Try:
function fnCheck_Vis(Row, sField, sMode)
{
sField = sField + "_vis";
var sTest = Row[sField];
alert(sTest);
}