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Angular 4 - Printing a unique and dynamic value on an HTML with Angular's *ngFor

So i am presented with a task from the client to make a loop of div elements draggable. To make this happened, i have used angular2-draggable to make it possible.
It works on a single div that has not been looped over, as seen below:
<div ngDraggable [handle]="DemoHandle" class="card">
<div #DemoHandle class="card-header">I'm handle. Drag me!</div>
<div class="card-block">You can't drag this block now!</div>
</div>
But the question is, how to i make take this code an place it into an *ngFor loop in Angular (maybe just like the code seen below)?
<div *ngFor="let myValue of myValues" [handle]="{{myValue.id}}">
<div #{{ myValue.id }} >{{ myValue.title }}</div>
</div>
The problem here is that both this [handle]="DemoHandle" and #DemoHandle (Im talking about the DemoHandle value) needs to be unique. But i have no way to print a unique value similar to this code below:
<div *ngFor="let myValue of myValues">
<div [attr.id]="myValue.id" >{{ myValue.title }}</div>
</div>
How do i go about this?

Template reference variables are unique within enclosed view. *ngFor directive create embedded view for each item so that template reference variable is unique there.
So just try the following:
<div ngDraggable *ngFor="let item of [1,2,3]" [handle]="DemoHandle">
<div #DemoHandle class="card-header">I'm handle {{item}}. Drag me!</div>
...
</div>
Ng-run Example

How to reset the value of $index in ng-repeat nested loops?

I have this code and not sure is it right or wrong the way to implement it. But definitely so far not working in my view.
<div ng-repeat="data in DataObject">
<ul style="list-style-type:decimal !important;">
<li ng-repeat="(indexX,answer) in bkm.content_detail.question_data.question_content[0].question_answer[0].answer_text track by $index">
{{indexX+1}} - {{answer | joinBy : " / "}}
</li>
<div ng-init="indexX=0"></div>
</ul>
</div>
Well, I tried to make value of indexX=0 at ng-init="indexX=0". Is it true the way I've done it?
The purpose I need to reset the value of indexX is because of nested loop of ng-repeat at the outer div.

You can add a directive to your ng-repeat loop that can utilize the scope.$last parameter to reset your index on the last element.
Example:
https://stackoverflow.com/a/13472605/6452040

hide div based on textfield input with angularjs

I need to hide a div(class "card") until the user enters text into the textfield.
I'm using angularJS for my app. I guess i have to use ng-showbut how can I get this to work? I appreciate your help.
This is my code:
<input type="text" ng-model="searchBox" class="search1" placeholder="Suchen...">
<div ng-repeat="item in posts | filter:searchBox" class="card">
<h3 class="w">{{item.storeName}}</h3>
[...]

You can simply set ng-show equal to the model value. When it's empty ng-show will evaluate to false and hide the div. When the input has a value ng-show will evaluate to true and show the div.
<div ng-repeat="item in posts | filter:searchBox" class="card" ng-show="searchBox">

add ng-show or ng-if to the element you want to show after value is entered
<div ng-repeat="item in posts | filter:searchBox" class="card" ng-if="searchBox">
or you can wrap this div with another div
<div ng-if="searchBox">
<div ng-repeat="item in posts | filter:searchBox" class="card">
but you do not have to do this... given that the filter will give results only if there is any value matching as per the searchBox, hence if there are not values, ng-repeat will not create any element

ng-repeat on two (or more) rows

My array:
$scope.data = [1,2,3,4,5,6,7,8,9,10];
My HTML:
<div ng-repeat="item in data track by $index">{{item}}</span>
This will output, as expected: 12345678910.
But I want to display the array over two rows, as in the following sample:
12345 // break here
678910
I run some functions on this array, so I don't want to split the array into two smaller ones, cause that would mean I have to run these other functions twice as often. I have looked into the 'start end' part of ngRepeat, but honestly, I don't understand how it works, thoughts?
Note: this is an ionic application, if that matters.
Edit: I can't get the suggested answers to work, I though I could dumb down my code, and make it work, but no. this is my full html ng-repeat code:
<div class="row">
<div class="col" ng-repeat="item in data track by $index">
{{item}}
<br ng-if="$index == 4">
</div>
</div>
This did not work, how come? Anything with row or col?

You could use ng-if to insert a new line when the $index is equal to 4:
<div class="col">
<span ng-repeat="item in data track by $index">
{{item}}
<br ng-if="$index==4">
</span>
</div>
Here, we also move the ng-repeat to a span element inside the div. This solves any potential issues which may arise from the styling applied to the div.

You could also experiment with item.$middle.
item.$middle: true if the repeated element is between the first and last in the iterator
https://docs.angularjs.org/api/ng/directive/ngRepeat
<div ng-repeat="item in data track by $index">
{{item}} <br ng-if="item.$middle" />
</div>
?

AgularJS ng-repeat without repeating parent elements

What I bassically want to do is the following:
I have two columns and I want to fill them with data with a single ng-repeat but without repeating the columns themselves. I think that it may not be possilbe, but I had to try :)
->Start ng-repeat="item in items"
<div exclude-from-repeat class="col1"> -> append {{item.Name}} here </div>
<div exclude-from-repeat class="col2"> -> append {{item.Description}} here </div>
->End ng-repeat

<div ng-repeat="item in items" class="col{{$index}}">{{item}}</div>
I know it's not what you asked for, but it does assign a different class to each column. The $index in ng-repeat goes from 0 to items.length-1
You could also try to use ng-repeat-start and ng-repeat-end to have more flexibility. But in general, I do not think it is possible to exclude the parent element from the ng-repeat loop.