Passing variable data between classes OO Javascript - javascript

I am trying to create a basic app for creating and editing contact details - for the purposes of improving my JavaScript skills. For some reason I can't manage to pass variable data from one class to the next - I'm trying to implement something similar to an MVC just to get started before i move to backbone.js
Here's my code:
//App Model Class
var contactsAppModel =
{
contacts:contacts,
/* App Methods */
init: function()
{
var theDetails;
//initiate App - pull App data
$j.ajax({
type: "post",
url: "inc/contactsModel.php",
dataType: "html",
data: '',
beforeSend: function(url,data)
{
$j('#result').html('<img src="images/page-loader.gif" height="80px" width="80px">').fadeIn('slow');
},
success: function(data)
{
this.contacts = data;
return this.contacts;
}
});
//alert('From WithOut '+this.contacts);
}
};
//App Class
var contactsApp =
{
//App Properties
contactDetails:'',
/* App Methods */
init: function()
{
//populate App properties
this.contactDetails = contactsAppModel.contacts;
$j('#result').html('<p>Contact Details:</p>'+this.contactDetails).css({'border-color': 'red'}).fadeIn('slow');
alert('From contactsApp: '+this.contactDetails);
},
};
How can i access the contents of variable 'data' from the contactsAppModel inside of contactsApp class? I'm trying to implement and OO-based solution to running a Javascript powered App with AJAX - not a functional approach.

Maybe can put contactsAppModel.init(); on the first line of your contactsApp.init() method.

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try this
var app = new Framework7({
id: 'io.framework7.testapp',
precompileTemplates: true, //
template7Pages: true,
root: '#app',
theme: theme,
cache: false ,/* disable caching */
data: function () {
},
methods: {
helloWorld: function () {
app.dialog.alert('Hello World!');
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},
routes: routes,
vi: {
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Try using the above method. This might solve your problem.

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I am getting a nested JSON data from REST. Now I want to capture that value in a variable. Everything is working fine but I don't know how should I initialize that variable.
So here is my initialize method of Model.
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var self = this;
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P.S: Logic wise code snippet is working. I just want to know what's the correct way to initialize the dropdownData in the initializefunction in BACKBONE MODEL
I would recommend avoiding initializing dropdownData in the initialize method entirely, instead utilizing model.defaults here. If you add the following to your model definition:
defaults: function () {
return {
dropdownData: []
};
},
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Note that it's important to use the function version of defaults here. If you were to do this instead:
defaults: {
dropdownData: []
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React Component JSON Callback Scope

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Basic React Component:
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loadData: function() {
jQuery.getJSON(jsonFile.json?callback=?)
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console.log(data);
}.bind(this));
},
render: function(){
return ( ... );
}
});
I've tried a few solutions, and have come to the conclusion that I need to define my own callback on the JSON file like so:
JSON:
handleData({
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This looks like an odd way to do things, especially the part where you're using jQuery. That's a client-side utility to overcome not knowing where everything is and not having direct access to your elements. It makes no sense to use it when you're using React weith Webpack for bundling: React already knows where everything is (using refs) and Webpack means you can just use regular universal Node modules for everything that you need to do.
I'd recommend using something like, using request or a similar universal fetch API:
// loadData.js
var request = require('request');
var loadData = function(urlYouNeed, handler) {
request(urlYouNeed, function(error, response, body) {
if (error) {
return handler(error, false);
}
// do anything processing you need on the body,
var data = process(body);
handler(false, data);
};
So: just a module you can require in any component you define with require('./loadData'). And then in your actual component you do this:
var loadData = require('./loadData');
var AppComponent = React.createClass({
getDefaultProps: function() {
return {
jsonURL: "cdn://whateverjson.json"
};
},
getInitialState: function() {
loadData(this.props.jsonURL, this.updateData);
return {
data: []
}
},
updateData: function(err, data) {
if (err) {
return console.error(err);
}
data = secondaryEnsureRightFormat(data);
this.setState({ data: data });
},
render: function(){
var actualThings = this.state.data.map((entry, pos) => {
return <Whatever content={entry} key={entry.dontUseThePosVariableUpThere}/>
});
return (
<div>
...
{actualThings}
...
</div>
);
}
});
Much cleaner.
If I understand correctly the question, you only have to change your loadData this way :
loadData: function() {
var c = this
jQuery.getJSON(jsonFile.json?callback=?)
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c.handleData(data)
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},
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var Component = {
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After running this I noticed through Chrome Developer Tools that the API is responding correctly with the following:
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Before the model and changing the request to:
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Explanation:
m.request is a function, m.request.then() too, that is why "store" value is:
"function (){return arguments.length&&(a=arguments[0]),a}"
"stores()" is undefined, because you do an async ajax request, so you cannot get the result immediately, need to wait a bit. If you try to run "stores()" after some delay, your data will be there. That is why you basically need promises("then" feature). Function that is passed as a parameter of "then(param)" is executed when response is ready.
Working sample:
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getAll: function() {
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};
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]);
}
};
m.mount(document.body, Component);
If you have more questions, feel free to ask here.

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