I have a <select> with ng-options defined by an object. ng-model captures the selcted object, but I want to also capture the key that was selected. I haven't been able to find a way to do that. Here's an html snippet.
<select class="form-control" id="xaxis" ng-model="model.xaxis" ng-options="k for (k,v) in model.options"></select>
Here's an example of the model.options object:
$scope.model.options = {
"power":{"label":"blah","values":[],"color":"red"},
"voltage":{"label":"blah","values":[],"color":"blue"}
}
If I select "power", my ng-model variable becomes {"label":"blah","values":[],"color":"red"}. I want to also capture, the key "power" as a scope variable. How would one do that?
You can use the key values instead, that way you can easily access data in your controller using $scope.model.options[$scope.model.xaxis].
Related
I am trying to bind my selected category's guid property to another ko.observable element. I need to hold that data value in order to send it to the server in a correct JSON format.
Jsfiddle
I am stucked at the binding selected category's guid value to SelectedCategoryGuid in order to appear in JSON file like
'SelectedCategoryGuid': 'guid1'
I have tried $data and $root bindings in the HTML but couldn't achieve it.
Step 1: Remove the quotes around your value data-bind. You should pass a reference to an observable here, not the name of a property.
value: Info.SelectedCategoryGuid
Now, you'll see your guid paragraph print: [object Object]. That's because it's storing the whole category, not just the Guid.
Step 2: To only store the Guid property, use the optionsValue binding. This binding works similar to the optionsText binding you've already used:
optionsValue: 'Guid'
Now things start working as intended. You'll notice the initial bla value gets cleared, because it does not appear in your data set.
Here's the two changes in a fiddle: https://jsfiddle.net/40sh1vjj/
I receive an object which is on server-side a map, i.e. a key-value array. I would like to bind it in an Angular form and be able to modify the value (easy) and the key. Challenge is that when the key is modified, the associated value has to stay linked.
I tried :
<div ng-repeat="(type, value) in estate.extraServices track by $index">
<input ng-model="type"> <input ng-model="estate.extraServices[type]">
</div>
But when the first input change, a new line is added to the map and the new one is not linked to the new one.
My goal is to avoid using a scope function to resolve this problem, so I ask without many hope, but who knows !
If a binding on a key isn't possible, I would probably change the object structure to an array of Pair object (2 property : key and value)
<div ng-repeat="pair in array">
<input ng-model="pair.key"> <input ng-model="pair.value">
</div>
You can't bind an input to the actual property name. Object property names can't be changed dynamically
Your first example however works fine to update values
<div ng-repeat="(type, value) in estate.extraServices track by $index">
{{type}} <input ng-model="estate.extraServices[type]">
</div>
As for adding keys you would need to use a different input not bound to that object to add a new key to the object. Then with an event handler use a function that updates the object
Same for removing keys , use an event handler function that would do delete object[key]
Changing to an array of objects with same key name structure would likely be simplest depending on how this object is used
DEMO
This code used to work just fine when I was using bootstrap's way of dropdown menus.. now that I switched to conventional I dont know why I'm getting this problem. Why can't I access the properties?? Driving me nuts here
HTML
<select class="form-control" ng-model="client" ng-change="clientSelect(client)">
<option value="">--- Please Select ---</option>
<option ng-repeat="client in clientList" value="{{client}}">{{client.clientName}}</option>
</select>
Angular/Javascript
$scope.clientSelect = function (client) {
console.log(client);
console.log(client.clientName); //is undefined
console.log(client.clientId); //is undefined
}
Ouput:
{"clientId":102,"clientName":"Testing"} //i clearly see the properties here...
UsersController.js:130 undefined
UsersController.js:131 undefined
EDIT: when I console.log($scope.clientList) it's fine.. the object of the first item in the array looks like this:
0: Object
$$hashKey: "object:254"
clientId: 102
clientName: "Testing"
_proto: Object
You can't access properties, because the client you get from ng-repeat is a string.
Check the console log of this Plunker I created with your code. You will see that the first consol.log(client) is actually logs out this string: {"clientId":102,"clientName":"Testing 1"}. Therefore, it doesn't have any properties.
From the select docs:
Note that the value of a select directive used without ngOptions is always a string. When the model needs to be bound to a non-string value, you must either explictly convert it using a directive (see example below) or use ngOptions to specify the set of options. This is because an option element can only be bound to string values at present.
Consider using the ngOptions directive instead of <select> with ng-repeat.
I am trying to have a contextual state dropdown menu that is bound to the country so that only the relevant states display.
I have looked at these two answers for a solution to my implementation.
Angularjs trigger country state dependency
angularjs dependant dropdown option value
But I cannot get them to work and am missing something.
My preferred solution would use some existing ng filter, but I understand that only works on arrays and not objects
<select ng-model="user.state" ng-options="state.name for state in states track by state.id | filter:state.countryid = user.country.id">
I tried converting the object to an array, but that did not seem to work.
I could create a custom filter, but I am hoping to avoid that.
<select ng-model="user.state" ng-options="state.name for state in states track by state.id | customStateFilter:user.country.id">
It seems like there should be some way to get ng-options to work without modifying the data.
Is there an existing Angular filter that works on objects or a way to do conditional logic to filter out the objects dynamically?
You have a few issues here (in addition to a mismatch of state.countryid and country.id):
First, track by comes after the filter (or, in other words, filter comes right after the array, since it filters the array).
Second, you are right - the built-in filter filter only works on arrays, not objects. For objects, you'd need a custom filter.
And lastly, filter filter doesn't accept an expression to evaluate (filter:state.countryid = user.country.id, not to mention that this "expression" that you tried to provide doesn't compare ===, but assigns =). filter accepts as a parameter either a string - to match any property against, an Object specifying which property to match against which value, or a predicate function.
In your case, an object is what you need.
To put this thing together you get:
<select ng-model="selectedState"
ng-options="state.name for state in states | filter: {countryid: user.country.id}:true track by state.id">
<option value="">select state</option>
</select>
I'm trying to use this kind of object
{1: 'foo', 2: 'bar'}
with ng-select. I've tried all the four options from the documention it shows for objects but I can't get it to work. I've already searched SO for this kind of question but none of ones I found matches my object.
<select ng-model="selectedCountry" ng-options="value for (key, value) in countries"></select>
When selecting one of the selects that it shows it is using, I guess the object id or index, but not the propety as value. I'm expecting it to get the value 1 when foo is selected and 2 when bar is selected. I'm trying to get the properties as values for the select.
Plunker example.
This is not a typo. it doesn't work in the desired way even after I've removed the ng- prefix of the element. Check the updated Plunker link.
If I'm understanding the question correctly, given {1: 'foo'} you want the dropdown to show foo in the dropdown, and output 1 when selected.
This option would work:
ng-options="key as value for (key, value) in countries. key as sets the output to the key element, value for sets value to the dropdown iterator.