I want to bind a model value to selected item
<select id="hours" ng-model="v.T_Hour">
<option ng-repeat="n in [].constructor(24) track by $index" ng-selected="{{$index==v.T_Hour}}" value="{{$index}}">{{$index>9?$index:"0"+$index}}:00</option>
</select>
I want after the page loads , the value of the model 'v.T_Hour' to be selected in select , i assign the value of the model in the controller, when i view the resulting HTML i see that the value is selected in the HTML code ,but not selected in the select control , and the select control displays an empty item.
Try this
<select
name="name"
id="id"
ng-options="option.name for option in v.data track by option.value"
ng-model="v.selected"
class="form-control inline-forms">
<option value="" selected>{{placeHolder}}</option>
</select>
and in controller
$scope.v = {data:[], selected:{}, placeHolder:""}
$scope.v.data = [{name:"nameOne", value:"valueOne"},{name:"nameTwo", value:"valueTwo"},{name:"nameThree", value:"valueThree"}]
$scope.v.selected = $scope.v.data[0]
$scope.v.placeHolder = "Click to Select"
According Angular documentation ngOption is better way to go than ngRepeat:
Choosing between ngRepeat and ngOptions
In many cases, ngRepeat can be used on elements instead of ngOptions to achieve a similar result. However, ngOptions provides some benefits:
more flexibility in how the 's model is assigned via the select as part of the comprehension expression
reduced memory consumption by not creating a new scope for each repeated instance
increased render speed by creating the options in a documentFragment instead of individually
Specifically, select with repeated options slows down significantly starting at 2000 options in Chrome and Internet Explorer / Edge.
see: https://docs.angularjs.org/api/ng/directive/select
Related
I am using AngularJS (1.5) and im trying to create a select dropdown that can display a different text when selected vs shown in dropdown options
Option example {id: 1, name: 'text', selected: 'this was selected'}
Given the example above, how can i show the name property when they open the dropdown but the selected property after the option is selected?
You have a couple options for dropdowns in angularjs. If you're going the ng-repeat route, then if you have an array of objects structured like your example, then this would work:
<select ng-model="selectedItem">
<option ng-repeat="item in items" value="item.selected"> {{item.name}} </option>
</select>
This will display the "name" in the dropdown, but since value=item.selected, it will assign the "selected" value to your ng-model.
Alternatively, you can do ng-options for the select and something like this would work:
<select ng-model="selectedItem"
ng-options="item.selected as item.name for item in items">
</select>
This does the same thing, but ng-options tends to allow more flexibility as you can assign entire objects to your model rather than just strings like ng-repeat only allows, plus angular claims it's faster.
Hope this helps. See here for more info https://docs.angularjs.org/api/ng/directive/select
When I click a button and get the selected schoolclass via:
$scope.selectedSchoolclasses[0] then there is only the schoolclass schoolclassNumber like "7a" but not the Id property.
Why is that? The bound schoolclasses array and its item have Id and schoolclassNumber properties.
Controller
$scope.schoolclasses = schoolclasses;
$scope.selectedSchoolclasses = [];
Html
<div class="col-sm-8">
<select size="5" class="form-control control-label col-sm-6" multiple ng-model="selectedSchoolclasses">
<option class="co-sm-6" ng-repeat="s in schoolclasses">
{{s.schoolclassNumber}}
</option>
</select>
</div>
To be able to store instances of objects, you need to use ng-options:
<select size="5"
class="form-control control-label col-sm-6"
multiple
ng-model="selectedSchoolclasses"
ng-options="s.schoolclassNumber for s in schoolclasses">
</select>
In many cases, ngRepeat can be used on <option> elements instead of ngOptions to achieve a similar result. However, ngOptions provides some benefits such as reducing memory and increasing speed by not creating a new scope for each repeated instance, as well as providing more flexibility in how the <select>'s model is assigned via the select as part of the comprehension expression. ngOptions should be used when the <select> model needs to be bound to a non-string value. This is because an option element can only be bound to string values at present.
(emphasis mine)
I am trying to show tags in a Bootstrap select combobox. However, ng-repeat is not populating the options. After some research, I believe I need to write a directive for this, because Bootstrap takes the options and makes a list out of them before Angular adds the options. But I don't know what writing a directive involves.
<select class="combobox form-control" ng-model = "tags.repeatSelect">
<option ng-repeat = "tag in tags.tagNames" value = "{{tag.string}}"> {{tag.string}} </option>
This may solve your problem.
<select data-ng-model="modelValue" class="form-control" data-ng-options="item.string for item in tags.tagNames">
</select>
In the form I have a drop down list with multiple choice, as shown below. Elements are loaded from the database.
<label>Items</label>
<select class="form-control m-b"
ng-model="model.livingComplexId"
x-ng-change="updateOne(model.livingComplexId)">
<option></option>
<option ng-repeat="itemOne in itemsForAddrLevelOne"
value="{{itemOne.id}}">{{itemOne.tobName}}</option>
</select>
I make choose.
For example, I choose an item2.
Then save data. Then, I open the form to edit and I want to see an item that I chose, but the list is empty...
How can I set the previously selected value?
I would recommend to use the ngOptions directive to generate the select menu options:
<select ng-model="model.livingComplexId" ng-options="itemOne.id as itemOne.tobName for itemOne in itemsForAddrLevelOne"></select>
Maybe you could additionally change the ng-model value to model and use ng-options="itemOne as ..." (without the .id) and add an track by itemOne.id.
<select ng-model="yourModel" ng-options="itemOne.tobName for itemOne in itemsForAddrLevelOne"></select>
In the js you should set $scope.yourModel = itemsForAddrLevelOne[0];
I am getting empty Option field in select tag.
My code is shown below:
openSelectBoxModel="47"
openSelectList=[{id:""47",name:"text"}];
valuekey="id";
titlekey="name";
<select id="reportOpenSelectBoxSingle" size="6" ng-style='selectStyle' class="openSelectBox" ng-model="openSelectBoxModel" ng-change="changeFn()" >
<option ng-selected="openSelectBoxModel===item[valueKey]" ng-repeat="item in openSelectList" id="" ng-value="{{item[valueKey]}}" ng-title="{{item[titleKey]}}" ng-bind="item[titleKey]"></option>
</select>
Please help me to solve this problem.
You should not use ng-selected with ng-model.
The thing to do is to bind the selected item to your ng-model before displaying it.
//Also, instead of ng-repeat, you should use ng-option
As far as performance is regarded : ng-options does not create child scopes for every iteration. When angular performs its digest, your ng-repeat will slow it. If you have a list with hundreds of elements, you will feel a difference.
<select id="reportOpenSelectBoxSingle"
size="6"
ng-style='selectStyle'
class="openSelectBox"
ng-model="openSelectBoxModel"
ng-change="changeFn()" >
<option ng-repeat="item in openSelectList"
value="{{item[valueKey]}}"
title="{{item[titleKey]}}"
ng-bind="item[titleKey]">
</option>
</select>
Furthermore, you need to declare your variables inside a controller :
$scope.openSelectBoxModel="47";
$scope.openSelectList=[{id:"47",name:"text"}];
$scope.valuekey="id";
$scope.titlekey="name";