AngularJs: How to set radio button checked based on model

Question

I have a model returning in the storeLocations object with a isDefault value. if isDefault returns true, I wan't to set that radio button in the group as checked.

Not sure if I need to do a $each(data, function(index,value) and iterate through each object returned or if there's an easier way to do this using angular constructs.

Object:

storeLocations = [
 {
  ... more values,
  isDefault: true
 }
]

Markup:

    <tr ng-repeat="location in merchant.storeLocations">
        <td>{{location.name}}</td>
        <td>{{location.address.address1}}</td>
        <td>{{location.address.address2}}</td>
        <td>{{location.address.city}}</td>
        <td>{{location.address.stateProvince}}</td>
        <td>{{location.address.postalCode}}</td>
        <td>{{location.address.country}}</td>
        <td>{{location.website}}</td>
        <td>{{location.zone}}</td>
        <td><input type="radio" ng-model="location.isDefault" value="{{location.isDefault}}" name="isDefault_group"></td>

Elmoelmore

Do you need an isDefault on every store location object? It seems it might be easier to remove that property from every object and just have a single storeDefault property. Then <input ... ng-model="storeDefault" value="{{location.id}}">. This of course assumes/requires that each location has a field (e.g., id) that holds a unique value. – Unclasp

I like the data structure you proposed better, but I'd still need to show the default store as checked when returning the storeLocation objects. – Elmoelmore

@joragupra Considering this question was asked in 2013, your linked answer should be marked a duplicate of this if anything. – Elmoelmore

Answer 1

Use ng-value instead of value.

ng-value="true"

Version with ng-checked is worse because of the code duplication.

Secco

Is that from a recent release? I don't think that was available in the version I was using at the time. – Elmoelmore

I use AngularJS v1.1.5. – Secco

This is the correct answer. Use 'ng-value' and 'ng-model' to correctly check/uncheck the button and to maintain the two way binding. – Claribelclarice

@Claribelclarice Just used this again, changing to correct answer. – Elmoelmore

doesn't work for me .. instead ng-checked has worked – Irksome

Idem for me. The only thing that works for me was ng-checked. Not ng-model nor ng-value. – Retsina

Answer 2

If you have a group of radio button and you want to set radio button checked based on model, then radio button which has same value and ng-model, is checked automatically.

<input type="radio" value="1" ng-model="myRating" name="rating" class="radio">
<input type="radio" value="2" ng-model="myRating" name="rating" class="radio">
<input type="radio" value="3" ng-model="myRating" name="rating" class="radio">
<input type="radio" value="4" ng-model="myRating" name="rating" class="radio">

If the value of myRating is "2" then second radio button is selected.

Pops

How do you set the first one selected when the model is empty? I tried ng-checked and ng-init but doesn't work. Any ideas? – Neapolitan

Hi, Why are you not set the default value of your model on controller load or in ng-init method? If you set the default value of your model on controller load like "myRating" = 1 then first radio button will show selected. – Pops

What version of Angular? At least in 1.2, ng-model combined with "value" does NOT set one of the radio buttons to checked state when the page loads. Only after you select one does the two-way binding start to work. Edit: Actually, it works with numbers, but not if the value is a string. – Plumage

@Plumage I was having a problem with the radio button not being selected initially upon page load (even though I could see that ng-model and ng-value were the same for that radio button) and it turns out that one of the values was a number and one was a string, so Angular (apparently now using === unfortunately) determined they were not equal. I just wrapped one of the values in Number() where I was getting it from and all was fine. And I have seen a plunkr (sorry, lost the url) that shows this working with a string as well. Oh, also use 'ng-value' instead of 'value'! – Malfunction

Answer 3

One way that I see more powerful and avoid having a isDefault in all the models is by using the ng-attributes ng-model, ng-value and ng-checked.

ng-model: binds the value to your model.

ng-value: the value to pass to the ng-model binding.

ng-checked: value or expression that is evaluated. Useful for radio-button and check-boxes.

Example of use: In the following example, I have my model and a list of languages that my site supports. To display the different languages supported and updating the model with the selecting language we can do it in this way.

<!-- Radio -->
<div ng-repeat="language in languages">

  <div>
    <label>

      <input ng-model="site.lang"
             ng-value="language"
             ng-checked="(site.lang == language)"
             name="localizationOptions"
             type="radio">

      <span> {{language}} </span>

    </label>
  </div>

</div>
<!-- end of Radio -->

Our model site.lang will get a language value whenever the expression under evaluation (site.lang == language) is true. This will allow you to sync it with server easily since your model already has the change.

Farant

Answer 4

Ended up just using the built-in angular attribute ng-checked="model"

Elmoelmore

Hmm, this is just strange. Adding checked="checked" does not work but ng-checked="true" works and the only thing it makes is adding checked="checked" to the radio button. – Interjoin

My model at the time was a boolean so it worked out for me :\ – Elmoelmore

@Kremchik This is due to Angular digestion cycle. It first searches for directives during html parsing and then after assigning event listeners on the DOM and $watch-es on the models it compiles everything, which also involves generating attributes over your html markup. That is why if you use [code]checked="checked"[/code] angular will simply override it, simply because as angular team puts it: "Angular likes to be in control of your DOM". Hope it explains behaviour a bit – Chirp

Answer 5

As discussed somewhat in the question comments, this is one way you could do it:

• When you first retrieve the data, loop through all locations and set storeDefault to the store that is currently the default.
• In the markup: <input ... ng-model="$parent.storeDefault" value="{{location.id}}">
• Before you save the data, loop through all the merchant.storeLocations and set isDefault to false except for the store where location.id compares equal to storeDefault.

The above assumes that each location has a field (e.g., id) that holds a unique value.

Note that $parent.storeDefault is used because ng-repeat creates a child scope, and we want to manipulate the storeDefault parameter on the parent scope.

Fiddle.

Unclasp

Answer 6

Just do something like this,<input type="radio" ng-disabled="loading" name="dateRange" ng-model="filter.DateRange" value="1" ng-checked="(filter.DateRange == 1)"/>

Autocorrelation