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Dynamically creating buttons for paragraphs with Angularjs

I want to dynamically create a button for each paragraph that is created inside a contenteditable div. I've been thinking a lot and can't come up with a good solution. The things I've thought about are
putting the button and paragraph together into one directive and have the content editable add a new <button+p> tag each time the user hits return. This has the benefit of having both the button and the paragraph use the same controller, but it leaves the button in the content editable div so it can be deleted...
Use the Model to maintain an array of all paragraphs in the div, then create buttons for each of the paragraphs in this array. My question here is: if I update the model with new paragraphs, will the buttons automatically be generated? If I use ng-repeat?
I'm kind of at a loss of the best way to approach this. Should I try to build the button and the paragraph together? Or is there a better way of separating them but binding them together so that when the button is clicked I can change the styling of the paragraph?

Create a directive and associate it to your div.
Ex:
Define as binding a parameter with two way data binding, the ones that will keep track of the p elements created inside the div and that will be passed from the the controller associated to your view.
Inject inside your link function of the directive the $element.
Then bind to the div with contenteditable the input event in order to detect edits in the div.
Inside this code get the total number of p children of your div, and associate it to the variable allowed from the directive.
In this way your parameter is always sync with the number of p inside your div, and it can be accessed from outside scopes because you pass it from outside.
Then inside your view, use a ng-repeat iterating over this parameter you passed in the directive, and create your dynamic content inside the ng-repeat.
HTML Code:
<div ng-app="myApp">
<div ng-controller="Controller">
<div contenteditable="true" p-inspector p-elements="pElementsNumber">
TEST
</div>
{{pElementsNumber}}
<div ng-repeat="p in returnArrayFromNumber() track by $index">
P detected
</div>
</div>
</div>
Here the JS code:
angular.module('myApp', [])
.controller('Controller', ['$scope', function($scope) {
$scope.pElementsNumber = 0;
$scope.returnArrayFromNumber = function () {
return new Array($scope.pElementsNumber);
};
}])
.directive('pInspector', function($rootScope) {
return {
restrict: 'A',
scope: {
pElements: '='
},
link: function ($scope, $element, $attrs) {
$element.on("input", function(e) {
var htmlString = $element.text();
var regex = /<p>[^<p><\/p>]*<\/p>/gi, result, count = 0;
var count = 0;
while ( (result = regex.exec(htmlString)) ) {
count++;
}
$scope.pElements = count;
$rootScope.$apply();
});
}
};
});
Here the running example: https://jsfiddle.net/a0jwmpy4/81/
Just one recommendation: if you want to detect more elements, make this directive dynamic accepting the name of the elements in the parameters and detecting all of them. Please do not create a single directive for every element you want to detect inside the div :)
Hope this helps

Have you tried to use ng-repeat for each paragraph/modal then set all your code in each repeat something like below
<div>
<p ng-repeat="paragraph in paragraphs"> {{contentsOfParagraph}} <button ng-click="editParagraph(MayBeIDOfParagraph)">Edit</button></p>
</div>
now your js code will have a function editParagraph that pass the ParagraphID

Process UI Change on callback?

I have some divs positioned as follows:
<div style="top: {{ item.top }}px;"></div>
In my controller, I have an array of elements:
$scope.things = [{ "top": 10}];
I have JavaScript function in my controller that gets fired somewhat rapidly:
MyFunction.thingThatRunsCallbackRapidly(function(newTopValue) {
$scope.things[0].top = newTopValue;
});
The top value of the things updates properly, but the element won't actually change its position until some other binding in my controller changes. What gives?

Try to use ng-style instead of style if you want to dynamically update the value.
ng-style="{'top': item.top + 'px'}"
https://docs.angularjs.org/api/ng/directive/ngStyle

How to pass a ng-repeat variable in ng-if?

I have ng-repeat in first line of code , in the next line I need to create a dynamic variable based on what I get in ng-repeat.
code would look something like this:
<div ng-repeat="head in arrayofhead">
<span ng-if="canIbecreated_{{head}}">I am created!!</span>
</div>
where
arrayofhead = ["1","2","3"];
but this produces an error while similarly I can pass {{$index}} in this easily.
Why this ditching is present in Angularjs?
on Controller I would do
var canIbecreated_1="false";
var canIbecreated_2="true";
var canIbecreated_3="false";
To crate and not to create the span.

... ng-if="someFunc(head)" ...
Inside the ng-repeat block. That should do the trick.

how to replace current repeater in angular

I init a repeater colorSetOne in the HTML, and then, I want to replace with another repeater colorSetTwo, how to do this (it can be trigger by an event)? and here is jsfiddle : http://jsfiddle.net/8xWRm/
HTML:
<ul ng-app ng-controller="cubeCtrl">
<li ng-repeat="color in colorSetOne">{{color}}</li>
Javascipt:
function cubeCtrl($scope){
$scope.colorSetOne = ["red","blue","green","oringe"]
$scope.colorSetTwo = ["blue","red","black","white"]
}

You just need to reassign colorSetOne
$scope.colorSetOne = $scope.colorSetTwo;
If you want to keep colorSetOne then you should put your repeater on another variable like colorSet and just assign the appropriate color set as needed.

How do I update my html on Click in Angularjs Controllers

I have the html Structure that I need to update from the json data. My Json data is in a Controller. I need to write an expression for ng-click event that will read the json data and put the in the corresponding div in html. but I am not sure how to acheive this.
Below is what I have so far.
<body data-ng-app>
<div class="container" data-ng-controller="UpdateDataCtrl">
<div class="inner1"></div>
<div class="inner2"></div>
</div>
UPdate Controllers
</body>
function UpdateDataCtrl($scope) {
$scope.data = [
{
"USA":"Eglish",
"Pop":"232423432432"
},
{
"France":"French",
"Pop":"1212323432"
},
{
"Spain":"Spainish",
"Pop":"3432432"
}
]
}
On each click the 2 Div should get updated from the json. First div should have USA---English Pop---2342234232 and then on next click the div should have data from France and so on.
http://jsfiddle.net/MBFpD/1/
Thanks

It appears that you are unclear on the concept of AngularjS. You don't want to update the DIVs. You want to reference your model and then change the data in your model.
For example you can write the div like this:
<div class="inner1">Population: {{data[dataindex].Pop}}</div>
Then in the Controller you initialize the dataindex to 0, so that this will output the population from the first entry in the array:
$scope.dataindex = 0;
The click function (you must have the link with the ng:click inside the block governed by the Controller!) could then just increase the dataindex by one and by using modulo restart at 0 again when the end of the array was reached.
$scope.click = function() {
$scope.dataindex = ($scope.dataindex+1) % $scope.data.length;
Here is an updated and modified jsfiddle of your example which will show everything in action: http://jsfiddle.net/MBFpD/2/

Bind your data to your scope when you click on the link:
$scope.update = function() {
$scope.data = data; //your array defined locally to the scope
};
ng-repeat your data bound to the scope; display the container if the size of the array is > 0.
Use {{index}} to get the iteration variable inside the loop.
Above all, move your ng-controller declarative at the top to enclose both your ng-repeat and your ng-click; otherwise, AngularJS cannot guess what you want to achieve.
http://jsfiddle.net/MBFpD/5/