Starting the selection process using AngularJS and ng-repeat

Question

Starting the selection process using AngularJS and ng-repeat

My challenge is to have a pre-filled option in a select-box using ng-repeat with AngularJS 1.1.5. However, the select box always starts off with nothing selected and an empty option, which I don't want. It seems to be a side effect of not having anything selected initially.

I have managed to make it work by using ng-options instead of ng-repeat, but I prefer to use ng-repeat in this scenario. Even though my simplified example may not show it, I also need to set the title attribute for each option, which cannot be achieved with ng-options as far as I am aware.

I don't believe this issue is related to the common AngularJS scope/prototypical inheritance problem. I haven't noticed anything obvious when inspecting in Batarang. Additionally, when an option is manually selected in the UI, the model updates correctly.

Here's the HTML snippet:

<body ng-app ng-controller="AppCtrl">
    <div>
        Operator is: {{filterCondition.operator}}
    </div>
    <select ng-model="filterCondition.operator">
       <option 
           ng-repeat="operator in operators" 
           value="{{operator.value}}"
       >
           {{operator.displayName}}
       </option>
    </select>
</body>

And here is the corresponding JavaScript code:

function AppCtrl($scope) {

    $scope.filterCondition={
        operator: 'eq'
    }

    $scope.operators = [
        {value: 'eq', displayName: 'equals'},
        {value: 'neq', displayName: 'not equal'}
     ]
}

You can view the JS Fiddle for this here.

javascript angularjs

Answer 1

Answer №1

Sure, if you prefer not to use the conventional method of ng-options, you can incorporate the ng-selected attribute along with a conditional check logic in the option directive to ensure pre-selection functionality.

<select ng-model="filterCondition.operator">
    <option ng-selected="{{operator.value == filterCondition.operator}}"
            ng-repeat="operator in operators"
            value="{{operator.value}}">
      {{operator.displayName}}
    </option>
</select>

See Demo

Answer 2

Sure, if you prefer not to use the conventional method of ng-options, you can incorporate the ng-selected attribute along with a conditional check logic in the option directive to ensure pre-selection functionality.

<select ng-model="filterCondition.operator">
    <option ng-selected="{{operator.value == filterCondition.operator}}"
            ng-repeat="operator in operators"
            value="{{operator.value}}">
      {{operator.displayName}}
    </option>
</select>

See Demo

Answer 3

Answer №2

Angular utilizes the ng-options directive for the select tag, allowing you to easily set up options and establish a default value. Check out this updated example showcasing the functionality of ng-options: http://jsfiddle.net/FxM3B/4/

Here is the revised HTML code:

<body ng-app ng-controller="AppCtrl">
<div>Current operator: {{filterCondition.operator}}</div>
<select ng-model="filterCondition.operator" ng-options="operator.value as operator.displayName for operator in operators">
</select>
</body>

Answer 4

Angular utilizes the ng-options directive for the select tag, allowing you to easily set up options and establish a default value. Check out this updated example showcasing the functionality of ng-options: http://jsfiddle.net/FxM3B/4/

Here is the revised HTML code:

<body ng-app ng-controller="AppCtrl">
<div>Current operator: {{filterCondition.operator}}</div>
<select ng-model="filterCondition.operator" ng-options="operator.value as operator.displayName for operator in operators">
</select>
</body>

Answer 5

Answer №3

One thing to note is that Angular inserts an empty option element into the select because the model object it's bound to initially has an empty value.

If you prefer to set a default option, you can do so by assigning a value in the controller

$scope.filterCondition.operator = "your value here";

If you want to include an empty placeholder option, this approach worked well for me

<select ng-model="filterCondition.operator" ng-options="operator.id as operator.name for operator in operators">
  <option value="">Choose Operator</option>
</select>

Answer 6

One thing to note is that Angular inserts an empty option element into the select because the model object it's bound to initially has an empty value.

If you prefer to set a default option, you can do so by assigning a value in the controller

$scope.filterCondition.operator = "your value here";

If you want to include an empty placeholder option, this approach worked well for me

<select ng-model="filterCondition.operator" ng-options="operator.id as operator.name for operator in operators">
  <option value="">Choose Operator</option>
</select>

Answer 7

Answer №4

Shoutout to TheSharpieOne for bringing up the ng-selected option. If that was shared as an answer instead of a comment, I would have marked it as correct.

Check out this functional JSFiddle: http://jsfiddle.net/coverbeck/FxM3B/5/.

I've also made adjustments to the fiddle by including the title attribute, which I omitted in my initial post. It wasn't causing the issue, but it is why I prefer using ng-repeat over ng-options.

HTML:

<body ng-app ng-controller="AppCtrl">
<div>Operator is: {{filterCondition.operator}}</div>
<select ng-model="filterCondition.operator">
   <option ng-repeat="operator in operators" title="{{operator.title}}" ng-selected="{{operator.value == filterCondition.operator}}" value="{{operator.value}}">{{operator.displayName}}</option>
</select>
</body>

JS:

function AppCtrl($scope) {

    $scope.filterCondition={
        operator: 'eq'
    }

    $scope.operators = [
        {value: 'eq', displayName: 'equals', title: 'The equals operator does blah, blah'},
        {value: 'neq', displayName: 'not equal', title: 'The not equals operator does yada yada'}
     ]
}

Answer 8

Shoutout to TheSharpieOne for bringing up the ng-selected option. If that was shared as an answer instead of a comment, I would have marked it as correct.

Check out this functional JSFiddle: http://jsfiddle.net/coverbeck/FxM3B/5/.

I've also made adjustments to the fiddle by including the title attribute, which I omitted in my initial post. It wasn't causing the issue, but it is why I prefer using ng-repeat over ng-options.

HTML:

<body ng-app ng-controller="AppCtrl">
<div>Operator is: {{filterCondition.operator}}</div>
<select ng-model="filterCondition.operator">
   <option ng-repeat="operator in operators" title="{{operator.title}}" ng-selected="{{operator.value == filterCondition.operator}}" value="{{operator.value}}">{{operator.displayName}}</option>
</select>
</body>

JS:

function AppCtrl($scope) {

    $scope.filterCondition={
        operator: 'eq'
    }

    $scope.operators = [
        {value: 'eq', displayName: 'equals', title: 'The equals operator does blah, blah'},
        {value: 'neq', displayName: 'not equal', title: 'The not equals operator does yada yada'}
     ]
}

Answer 9

Answer №5

To achieve the desired result, it is recommended to utilize ng-options in your code. In most cases, referencing the array element may be necessary for setting a default value (unless the array consists of strings).

Check out this example on JSFiddle for reference: http://jsfiddle.net/FxM3B/3/

Below is the JavaScript snippet:

function AppCtrl($scope) {
    $scope.operators = [
        {value: 'eq', displayName: 'equals'},
        {value: 'neq', displayName: 'not equal'}
     ]

    $scope.filterCondition={
        operator: $scope.operators[0]
    }
}

Here is the corresponding HTML code:

<body ng-app ng-controller="AppCtrl">
<div>Operator is: {{filterCondition.operator.value}}</div>
<select ng-model="filterCondition.operator" ng-options="operator.displayName for operator in operators">
</select>
</body>

Answer 10

To achieve the desired result, it is recommended to utilize ng-options in your code. In most cases, referencing the array element may be necessary for setting a default value (unless the array consists of strings).

Check out this example on JSFiddle for reference: http://jsfiddle.net/FxM3B/3/

Below is the JavaScript snippet:

function AppCtrl($scope) {
    $scope.operators = [
        {value: 'eq', displayName: 'equals'},
        {value: 'neq', displayName: 'not equal'}
     ]

    $scope.filterCondition={
        operator: $scope.operators[0]
    }
}

Here is the corresponding HTML code:

<body ng-app ng-controller="AppCtrl">
<div>Operator is: {{filterCondition.operator.value}}</div>
<select ng-model="filterCondition.operator" ng-options="operator.displayName for operator in operators">
</select>
</body>

Answer 11

Answer №6

If you're utilizing md-select and using ng-repeat with md-option from Angular Material, you can include

ng-model-options="{trackBy: '$value.id'}"

to the md-select tag as demonstrated in this codepen example

Sample Code:

<md-select ng-model="user" style="min-width: 200px;" ng-model-options="{trackBy: '$value.id'}">
  <md-select-label>{{ user ? user.name : 'Assign to user' }}</md-select-label>
  <md-option ng-value="user" ng-repeat="user in users">{{user.name}}</md-option>
</md-select>

Answer 12

If you're utilizing md-select and using ng-repeat with md-option from Angular Material, you can include

ng-model-options="{trackBy: '$value.id'}"

to the md-select tag as demonstrated in this codepen example

Sample Code:

<md-select ng-model="user" style="min-width: 200px;" ng-model-options="{trackBy: '$value.id'}">
  <md-select-label>{{ user ? user.name : 'Assign to user' }}</md-select-label>
  <md-option ng-value="user" ng-repeat="user in users">{{user.name}}</md-option>
</md-select>

Starting the selection process using AngularJS and ng-repeat

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

Answer №6

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