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v-model depending on conditions [duplicate]

I have a vue component that shows a form populated with items from a selected item to edit. Now I don't want to have to use a second form for creating a new item. At the moment I auto populate and update the item with v-model which obviously updates the object. Am I not able to use conditional operators in this like so?
<form #submit.prevent>
<div class="field">
<label class="label">Job Title</label>
<p class="control">
<input type="text" class="input" placeholder="Job title" v-model="experiences[editIndex].title ? experiences[editIndex].title : ''" />
</p>
</div>
</form>

You can use conditional operators with v-model, but you can't give v-model a string like you're attempting in your example.
I wouldn't use the same form for editing and creating (might be preference). I would make the form its own component and then make two additional form components for editing and creating.
However, if you really want to handle the logic in each input's v-model directive, you would need to give it a variable in the last part of the ternary operator. Something like this:
v-model="experiences[i].title ? experiences[i].title : newExperience.title"

If you use eslint-plugin-vue it will complain about ternary in v-model.
ESLint: 'v-model' directives require the attribute value which is
valid as LHS. (vue/valid-v-model)
So I'd rather explicitly use a pair of :value and #input props.
Like that:
<input
type="text"
class="input"
placeholder="Job title"
:value="experiences[editIndex].title ? experiences[editIndex].title : ''"
#input="experiences[editIndex].title = $event.target.value"
/>
Also, you can use some function for #input, which will check property existence and add it if necessary.

Dynamically generating validation attribute on input using interpolation

Edit: This question is no longer relevant as of Angular version: 1.3.0-beta.12 you can now parse ng-minlength and ng-maxlength dynamic values. See: https://github.com/angular/angular.js/issues/5319
My problem is quite simple: I need to dynamically create input validation (ex. ng-minlength) using interpolation.
And doing that I am running into some issues specifically generating the validation attributes for ng-minlength and ng-maxlength. I assume this is due to them only taking constants?
Below you can see my code, the reason I am using a wrapper through outerForm is that I cannot dynamically generate the name attribute of input elements using interpolation, and that I have to wrap each set of repeated inputs in an ngForm directive and nest these in an outer form element.
So again, the problem lies in the attribute ng-minlength="field.ValidationAttributes['data-val-length-min']" not being properly set.
When I print the value directly using {{field.ValidationAttributes['data-val-length-min']}} the value appears correct.
Do I have to create a directive to parse my information, do I need to create my own min/max validation or am I simply running into a syntax error?
<form name="outerForm">
<div ng-repeat="field in logEntry.StringValues">
<ng-form name="innerForm">
<input type="text" name="foo" ng-model="item.foo" ng-minlength="field.ValidationAttributes['data-val-length-min']" required/>
<span ng-show="innerForm.foo.$error.required">required</span>
<span ng-show="innerForm.foo.$error.minlength">to short</span>
</ng-form>
</div>
</form>

Hi you can use double {} to interpolate dynamic validation rules please see here: http://jsbin.com/xayiro/1/
If you can post you field.ValidationAttributes model I can update jsbin.
HTML:
<ng-form name="innerForm">
<input type="text" name="foo" ng-model="item.foo" ng-minlength="{{validation.minlength}}" required/>
<span ng-show="innerForm.foo.$error.required">required</span>
<span ng-show="innerForm.foo.$error.minlength">to short</span>
</ng-form>
JS:
$scope.validation= {
maxlength:20,
minlength:3
};

AngularJS validation, binding, etc. not working when using jQuery plugins (eg. autoNumeric)

I have an angular form which was using angular's built-in validation successfully. Take the following markup for example:
<form name="numberForm" novalidate>
<input type="text" required />
<button type="submit">Submit</button>
</form>
When the browser loads, the input field renders like this (unnecessary attributes removed):
<input class="ng-pristine ng-invalid ng-invalid-required" />
If I were to enter a value in the input field, the markup turns into:
<input class="ng-dirty ng-valid ng-valid-required" />
All of this was working great. Then I implemented two jQuery plugins to implement some masking/input formatting for the form: autoNumeric and jQuery.maskedinput. Now, nothing I do will change the original ng-pristine ng-invalid... classes on the input. It also doesn't seem to allow the binding of models to be successful either.
Any ideas?
I tried creating a http://jsfiddle.net/ma44H/3/, but can't seem to figure out how to get it to work.

JQuery and Angular do not cooperate well
Chocolate and Peanut Butter taste great together, but AngularJS and JQuery are a painful mix. We've all tried (with varying success) to accomplish this.
The problem is that JQuery DOM manipulation works outside of AngularJS Digest Cycle. The lesson is usually that using pure Angular is better.
Alternative #1: Angular UI
Try Angular-UI. Set of tools every Angular Developer could use.
Whatever Mask you want to implement can be done with their ui-mask directive:
Want a Date Mask?
<input type="text" ng-model="date" ui-mask="99/99/9999" />
Currency Mask?
<input type="text" ng-model="currency" ui-mask="$99999999.99" />
Phone Mask?
<input type="text" ng-model="phone" ui-mask="1 (999) 999-9999" />
:
See Fiddle
:
Alternative #2: Filters
Angular has built-in filters:
Currency:
$filter('currency')(amount, symbol)
Date:
$filter('date')(date, format)
Insist on using JQuery? Try the jQuery Passthrough directive from the angular-ui toolset. I haven't made use of this directive but it's an intriguing option:
To call something like $.fn.tooltip() simply do ui-jq="tooltip". Note
that the name of the function must be identical. This also works for
normal jQuery commands such as $.fn.slideUp().
To pass parameters use the ui-options attribute. The value will be
evaluated in the $scope context and passed to the function. If
defaults are set, the passed options will extend them. If a string is
passed, the default options will be ignored.
Use the directive name jq for namespacing inside uiJqConfig. Then
sub-namespace options for each function by the name of that function
(exactly as it is passed to ui-jq) so that you don't have to pass
options every time you call the directive.

AngularJS how to properly use ng-model as a class?

I read the angularjs docs and it says you can use ng-model directive as a class like this:
<input class="ng-model">
My issue is, I want to bind this input to a variable like test. How do I do this?
I tried using
<input class="ng-model='test'">
<h1>{{test}}</h1>
but it's not working..
How do I do this? Please help.

ngModel docs are wrong and require updating.
ngModel directive definition object does not have a restrict property, which means that it will work only with the attributes, as in:
<input ng-model="test" />
So you're out of luck. Sorry.

Use the ng-class directive. In the example below, the css-class will be applied when isCssClass (i.e. $scope.isCssClass) is true.
<input ng-class="{css-class: isCssClass}">

Angular.js: update binding after manual modification

I'm only starting to dive into angular.js and have found this issue that I can't seem to get around. Consider this simple code:
<input type="text" ng-model="test">
<input type="text" value="{{test}}">
When I write in the first field, the second one is updated nicely. When I write in the second field and then go back to the first one, the binding is not updated anymore. Interestingly though, the HTML attribute value does get updated - it's just not displayed.
Equivalent (at least roughly) code in vanilla javascript does not suffer from this:
<input type="text" id="model">
<input type="text" id="binding">
<script>
var model = document.getElementById("model");
var binding = document.getElementById("binding");
model.addEventListener("keyup",function() {
binding.value = model.value;
});
</script>
Here's a fiddle for you to test both: http://jsfiddle.net/Q6b5k/
Any idea why this happens when using angular.js and how to fix this?
[EDIT] Judging by the initial replies, it appears I have not made it clear. I do not want the second field to update the first one. The binding is to be one-way only, e.g. to allow filtering or even manual corrections (such as automatic creation of a URL alias in a blog post creation form). http://jsfiddle.net/Q6b5k/1/

The value attribute is only used when rendering the initial HTML. After the page load, everything else happens in the Angular Event Loop and therefore you need to do something that event loop can pick up. You can use ng-change for what you are looking to do:
<input type="text" ng-model="test" ng-change="test2=test.toLowerCase();" />
<input type="text" ng-model="test2"">

This happens because {{value}} does not create a binding, it is used for interpolation.
The simplest solution is to use ng-model in both the fields
<div ng-app>
Angular.js:<br>
<input type="text" ng-model="test">
<input type="text" ng-model="test">
</div>
Demo: Fiddle