Exploring the World of Observables within AngularJS

I've been experimenting with some exercises to grasp the inner workings of AngularJS, but I'm feeling a little lost at the moment.

Despite scouring through the API, various documentation, and tutorials, I haven't quite found what I'm looking for.

To illustrate my point, I've put together a small JsFiddle: http://jsfiddle.net/8HqnZ/

What I'm attempting is fairly basic... although I suspect I may not be doing things the best way possible. Nonetheless, I'm eager to learn and any advice would be greatly appreciated.

My main goal here is:

To make everything dynamic... without question.

  1. I'm puzzled as to why changing the name or date in my input fields at the top doesn't update the red bars below (it seems like they're not observable...)
  2. I've also included a "get data" button to view my updated JSON, but it only returns [object, Object]...

In addition to resolving these issues, I'd like to explore the possibility of creating draggable red bars that can update the dates at the top... if that's achievable.

Here's a snippet of my small app:

function App($scope) {
        $scope.windows = [
            {"name":"First Window","from":"2013-11-05","to":"2013-11-21"},
            {"name":"Second","from":"2013-11-10","to":"2013-11-30"},
            {"name":"Another One","from":"2013-11-17","to":"2013-11-20"}
        ];

        $scope.addWindow = function() {
            $scope.windows.push({"name":"insert name","from":"2013-11-01","to":"2013-11-02"});
        };

        $scope.setWindow = function(from, to) {
            var f = (from.split("-")[2]) * 40,
                t = ((to.split("-")[2]) * 40) - f;

            return { f: f, t: t };
        };

        $scope.getData = function() {
            console.log($scope.windows);
        };

};

The HTML structure looks something like this (I've omitted the "calendar"):

<div ng-app ng-controller="App">

    <section id="window-data">
        <div ng-repeat="window in windows">
            <label>Name:<input value="{{window.name}}"></label> <label>From:<input type="date" value="{{window.from}}"></label> <label>To:<input type="date" value="{{window.to}}"></label>
        </div>
        <button id="add-window" ng-click="addWindow()">Add Window</button>
    </section>

    <section id="window-display">
        <div id="date-labels">
            <div class="block">
                <span class="rotate">2013-11-01</span>
            </div>
            <div class="block">
                <span class="rotate">2013-11-02</span>
            </div>
            ...
        </div> 

        <div id="windows">
            <div class="window-container" ng-repeat="window in windows">
                <span class="window" style="left:{{setWindow(window.from, window.to).f}}px; width:{{setWindow(window.from, window.to).t}}px">{{window.name}}</span>
            </div>
        </div>

    </section>

    <button id="get-data" ng-click="getData()">Get Data</button>

</div>

If you know of any helpful websites with clear and comprehensive documentation, examples, etc., please do share them with me.

Answer №1

Typically, I rely on the Angular website for all my documentation needs. Have you taken a look at their tutorial yet?

To address your concerns: It would be best to utilize ng-model for those inputs rather than manually setting the value.

<input ng-model="window.name">

The error you encountered likely stems from attempting to console.log JSON without converting it into a string first. Here's how you can log it properly:

console.log(JSON.stringify($scope.windows));

Check out this http://jsfiddle.net/8HqnZ/1/ for additional assistance.

Answer №2

1.

I am puzzled by the fact that changing the name or date in my input fields at the top does not trigger an update in the red bars (it seems unobservable...)

In order to achieve two-way data binding, it is necessary to use ng-model. Specifically, you should do this

`<input ng-model="window.name">`

instead of setting the input value as "window.name"

I have also added a get data button to view the updated Json, but it only returns [object, Object]...

This behavior is to be expected.

  1. For a draggable element, a custom AngularJS directive needs to be created.

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