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How to assign max-tag value dynamically?

If I assign max-tags="1", it working perfectly but when I tried to assign dynamically by using max-tags="maxtag()",through link function, but it is showing red border for input box. From view I am trying to put max number of tags. Everything is working fine, but input box is red,
It is showing like following text image. Like warning. How to fixed it.
Working Demo
http://plnkr.co/edit/ooTucE4yqmLwMH9kNkO7?p=preview
<tags-input ng-model="modeldisplay" class="input-md" display-
property="data" on-tag-removed="removedCustomerTag()"
placeholder="Select a User" on-tag-adding="addSearchedTag()" on-tag-added="tagAdded($tag)"
enable-editing-last-tag="removedCustomerTag()" replace-spaces-with-dashes="false" max-tags="maxtag()"
add-from-autocomplete-only="true">
<auto-complete source="loadTags($query)" min-length="1" load-on-focus="true" load-on-empty="true"
max-results-to-show="10" template="autocomplete.html">
</auto-complete>
</tags-input>

Most options of ngTagsInput are simply DOM attributes, thus you should use interpolation in order to dynamically change them:
<tags-input ng-model="modeldisplay" max-tags="{{maxtag}}" ...></tags-input>
That would work, but not quite as one might expect. To keep the number of watches as low as possible, ngTagsInput doesn't actively monitor DOM attributes by default, so the {{maxtags}} expression above is evaluated only once. In your case, that seems to be enough. But if it isn't, you can change that behavior by using the tagsInputConfigProvider service in your module`s config block:
app.config(function(tagsInputConfigProvider) {
tagsInputConfigProvider.setActiveInterpolation('tagsInput', {
maxTags: true
});
});
You can learn more about that on ngTagsInput documentation.
Finally, here is your updated Plunker.

AngularJS - how to add dynamic ng-model

I'm working with a form and would like to add ng-model on dynamic input elements. I have a scope variable defined as:
$scope.formData = {};
On the page there are a couple of drop-down lists that users can choose an option from and based on those options we are appending some input fields to form body.
formBody.append('<input ng-model="formData.'+obj.Title+'" type="number"></input></br>');
This is not working for me because I'm assuming once the controller runs it can't register any new ng-model. Is there way to add dynamic ng-model or there is a different approach to what I'm trying to do (i.e. build predefined views that can be loaded on the page)?
EDIT:
I have created a jsfiddle that outlines what I'm trying to do - http://jsfiddle.net/k5u64yk1/

If you need to dynamically add html with dynamic bindings that cannot be encapsulated into ng-repeat, ng-if, etc, you have to call $compile on the template once it has been modified to alert AngularJS that it has to reparse the template and initiate a new digest cycle. This will pick up any new ng-model bindings and appropriately tie them to your scope.
HTML:
<div ng-app="MyApp" ng-controller="MyCntrl">
<button ng-click="addInput()">Add Input</button>
<div id="form">
input would go here.
</div>
</div>
JS:
By placing your add input inside of a click event, you avoid an infinite compile loop. Note that this currently resets the state of your form, so if you wanted to work around that you'd need to capture your form state and restore it after compile.
$scope.addInput = function () {
var aForm = (angular.element(document.getElementById('form')));
if ($scope.data["Digital Conversation"][0].MetricType.Title === "Number") {
aForm.append(
'<input ng-model="formData.' +
$scope.data["Digital Conversation"][0].Title.Title +
'" type="number"></input>');
}
$compile(aForm)($scope);
}
You can find the working jsfiddle here: http://jsfiddle.net/k5u64yk1/

Dynamically how to make checkbox check/uncheck in angularjs controller using ng-click

I am new to Angular JS. When the user check/uncheck on a check box, I am calling a function in a controller using ng-click. I am passing $event to the function in controller. Using the $event, I am able to get the srcElement inside the controller function. Now I would like to set the previous check/uncheck value to the check box based on certain conditions.
$scope.isAccessChanged = function(event){
if (some condition) {
var elem = angular.element(event.srcElement);
/** here how to set the elem value back to whatever it was before.*/
}
};

Lets say you have check box like
<input ng-model="form.isSelected" type="checkbox">
All you need to do is:
$scope.form.isSelected = !$scope.form.isSelected;

Avoid DOM manipulation and limit jQuery use as much as possible in angular.
I recommend using jQuery only in directives to make it less of an available option.
Try this out:
<input type="checkbox" ng-model="foShizzle" ng-click="isAccessChanged()"/>
$scope.isAccessChanged = function(event){
if(some condition){
$scope.foShizzle = !$scope.foShizzle; // This will reverse the user's decision
}
}

angularjs scope for ngModel is not working as expected

I have created custom directive drop down in angularjs and ionic-framework. In my dropdown items will open in modal popup which is working very good.
But I have kept search input box with clear button input box which is tide up with ng-model='search' and on button ng-click if I put ng-click="search=''" than it will work very good but if I put function and try to delete from directive module than it will not work
In template
<input type="search" ng-model="search" placeholder="select city...">
<button ng-show="search.length" ng-click="clearSearch()" class="customIcon button button-icon ion-close-circled input-button"></button>
In directive module
$scope.clearSearch = function() {
$scope.search = '';
}
then it will give me error
$scope.search is undefined
I am just very much confuse with $scope thing I also want to know how can i know scope any tool or something
I have also another issue that I kept two custom directive on the same and when first control change its value I want to clear the selection in second directive for that I am doing $watch also but I don't understand How can I do
My plunkr
http://plnkr.co/edit/GxM78QRwSjTrsX1SCxF7?p=preview

I have no experience with Ionic, but these types of issues are usually related to how prototypal inheritance works in JS and AngularJS.
A great explanation on prototypal inheritance in relation to Angular can be found here.
The issue can usually be solved by moving the property into an object:
$scope.viewModel = {};
$scope.clearSearch = function() {
$scope.viewModel.search = '';
};
And then use viewModel.search in your HTML where you need it:
<input type="search" ng-model="viewModel.search" placeholder="select city...">
Demo: http://plnkr.co/edit/4SLfA1CjRWB1XazIhj9d?p=info

ng-model inside radio input refresh

I'm using a jQuery library of radio/checkbox components (yeah, I know using jQuery is bad with angular, but that was not my choice to use that library and I cannot change that) and I got a problem with refreshing ng-model data (radio component in library does a simple click trigger event when radio value change).
I noticed, that while one click trigger does nothing to model, triggering it twice solves the problem (but that is not the way I would like to solve this problem). I prepared a simple fiddle- a little example of what is my problem. First click (executing changeInput(1, 1) in the code below) on a button does a change in DOM, but does nothing to angular model - while clicking just on the radio button is doing just fine. Executing changeInput(1,2) does exacly the same as clicking the radio element.
function changeInput(obj, num){
for(var i = 0; i < num; i++){
$('input').eq(obj).click();
}
}
What else can I do? While reading stackoverflow I have noticed that people say that triggering 'input' solves the problem - but not in that case (JSFiddle). Is triggering click twice is the only way to solve this problem?

In Angular things don't work the way you might be used to. Once you get used to it, you will enjoy the much more straightforward and declarative nature of you code.
You said:
"in this question I would like only to know how to make model changes"
Nevertheless, in your attempts your are trying to make model changes by changing the view (programmatically). This is both unintuitive and a nightmare in terms of maintainability.
In Angular you should worry about your data (model) and watch the views adapt automagically.
So, if you want to make model changes, then all you need to do is to...well, change the model:
<input type="radio" name='test' ng-model="value" value="0" />
<input type="radio" name='test' ng-model="value" value="1" />
<button ng-click="changeInput(0)">Change value to 0</button><br/>
<button ng-click="changeInput(1)">Change value to 1</button><br/>
function Ctrl($scope) {
$scope.value = 0;
$scope.changeInput = function (newValue) {
$scope.value = newValue;
}
}
In order for Angular to do its magic and update the view you need to perform the action within the Angular context (ng-click instead of onclick takes care of that). If for whatever reason you can't use ng-click, you need to let Angular know something changed by wrapping your code in the changeInput() function in $scope.apply().
See, also, this short demo.

I had a similar issue once using only angular. The ng-binding of your input must be a property of an object defined in your controller. I think that otherwise, the input value is binded to a variable defined in the input own scope.
That wouldn't work :
<input type="checkbox" ng-model="selected"></input>
But that would :
<input type="checkbox" ng-model="someObject.selected"></input>
with for example in you controller :
$scope.someObject = {
selected: false
};