I have following problem with using of AngularJS ngRepeat.
The issue can be viewed in this jsFiddle.
http://jsfiddle.net/zono/9rmEs/2/
The user can choose character and after this get all combination
of chosen characters in alphabet. Eg:
A - A-B, A-C, A-D and etc.
B - B-A, B-C, B-D and etc.
Everithing works properly but when user change value of selected
character the combination does not get updated. I solved this problem
with adding following code.
<span style="display: none;">
{{item.combionations = getCombinations(item)}}
</span>
And "hack" it. But there must be normal solution.
I would be very grateful for any ideas and recommendations.
Best regards.
Update
In case you plan to do more complex calculations based on the selection this simplified approach would not work. In general it is also better to encapsulate state in some data structure. In your case you could design a structure like this:
{ letter: "A", combinations: ["A-B", "A-C", ... ] }
To update the combinations array you can use ng-change="updateItem(item)" and some update function. Whenever you change the selection the array combination gets updated:
$scope.updateItem = function(item) {
item.combinations = getCombinations(item.letter);
}
I put this in a new fiddle.
You can easily solve this issue by using the model you bound to ng-select in the ng-repeat.
In the select you used item.model. Angular will update its value in the scope whenever you change the selection.
<select data-ng-model="item.model" ng-init="item.model=allLetters[0]" ng-options="value for value in allLetters">
</select>
When you use the same scope variable in ng-repeat you should get the desired behavior.
<div ng-repeat="letter in allLetters">
{{item.model}}-{{letter}}
</div>
Take a look an the updated fiddle.
The problem is that you compute combionations once at the begenning (ng-init="item.combionations=getCombinations(item)"). After that it never gets updated when you change item.model.
You could solve this problem (and also make sure created[...].combionations is kept up-to-date) like this:
<div data-ng-repeat="item in created">
<div ng-repeat="combination in item.combionations = getCombinations(item)">
{{combination}}
</div>
...
See, also, this short demo.
Related
I have an array of items that each display as a directive inside an ng-repeat like this:
<div ng-repeat="item in ctrl.data | filter:ctrl.query" class="ubi-box container-fluid">
<user-item item="item" . . .></user-item>
</div>
As you can see, there is a filter on the ng-repeat. Inside the directives, users can edit items inside forms that show when the user clicks on one of the items.
Trouble occurs when the user edits a field that affects the filter. If the user has found the item using the filter (ctrl.query), and if the edited text means the item no longer matches the filter, that item suddenly vanishes before the user can hit save or anything. Poof!
What is the most elegant solution? I don't want to turn the filter off when editing commences, because then all the items will reappear. I want the filter to still work, but I want the item being edited to keep showing even if it would be filtered out.
Do I set an "isOpen" flag in each item, and add an "or isOpen" clause to the filter? Adding flags like that always feels kludgy to me, and I'm not even sure how to do that in the filter syntax.
Do I add an "or isFormVisible" clause to the filter? That might be neater, but again, how do I even do that in the ngRepeat filter syntax?
Thoughts?
Thanks in advance
John
There might be more elegant solutions out there, but I would probably follow the example from the Angular documentation.
https://docs.angularjs.org/guide/forms#binding-to-form-and-control-state
When editing commences, copy the item being edited to a new object that populates the edit controls (the view controls behind the scenes are still the master object). Once you save, you copy the updated object into the master object which will at that point revert back to the view mode and it'll be hidden by the filter.
Something along these lines:
$scope.edit = function (item){
$scope.editItem = angular.copy(item);
}
$scope.saveTo = function(item){
for (var i = 0; i < $scope.items.length; i++){
if ($scope.items[i].id === item.id){
$scope.items[i] = angular.copy($scope.editItem);
break;
}
}
$scope.editItem = {};
}
I compare the ID in the item being edited to the ids of each item in the list to ensure only one can be ng-if'd at a time. Here's a sample plunk.
Update: Here's another plunk that uses a different query filter and all you do is set a flag when you go into edit mode to an id. Similar to the one before, but none of the master object code. If you already have an edit mode, this seems like it should be pretty quick to apply.
I would suggest using ng-model-options along with $render option, here is a working example : http://plnkr.co/edit/IFpXBYeJx1wrbKhhzMZg?p=preview
<form name="userForm">
<label>Name:
<input type="text" name="name" ng-model="name" ng-model-options="{ updateOn: 'click' }" />
</label>
<button ng-click="userForm.userName.$render();">Update Now</button>
<br />
</form>
I have this plunker code.
What I'm trying to do, is to display the gray box one time per row.
To achieve this, I thought to modify the partition filter in order to return a JSON to add it a new property by row to know if the gray box is expanded or not.
But, I could Not successfully return a JSON.
Do you know how to modify the filter to return a JSON or a better way to show the gray box by row?
Related questions:
Push down a series of divs when another div is shown
Update 1
The issue could be easily resolved by using the correct scope for the ng-repeat for the row without modifying the filter, thanks to #m59.
http://plnkr.co/edit/eEMfI1lv6z1MlG7sND6g?p=preview
Update 2
Live Demo
If I try to modify the item, it seems the ng-repeat would be called again losing the props values.
<div ng-repeat="friendRow in friends | partition:2"
ng-init="props = {}">
<div ng-repeat="item in friendRow"
ng-click="collapse(item)"
ng-class="{myArrow: showArrow}">
{{item.name}} {{item.age}} years old.
<div>{{item.name}}</div>
</div>
<div collapse="!props.isExpanded">
some content
<br/>
<input type="text" ng-model="currentItem.name">
</div>
</div>
js
$scope.collapse = function(item){
this.props.isExpanded = !this.props.isExpanded;
this.showArrow = !this.showArrow;
$scope.currentItem = item;
};
This causes the gray box to collapse each time the item is modified. Any clue?
I've updated my code/answer regarding partitioning data. It's important to fully understand all of that before deciding on an approach to your project.
The problem you have in your plnkr demo is that you're modifying the parent $scope and not the scope of the ng-repeat for that row.
Just set a flag on the row and toggle it when clicked:
Live Demo
<div
class="row"
ng-repeat="friendRow in friends | partition:2"
ng-init="isExpanded = false"
ng-click="isExpanded = !isExpanded"
>
<div ng-repeat="item in friendRow">
{{item.name}} {{item.age}} years old.
</div>
<div collapse="!isExpanded">
some content
</div>
</div>
To access the correct scope within a function in the controller, you can use the this keyword instead of $scope. this will refer to the scope the function is called from, whereas $scope refers to the scope attached to the element with ng-controller (a parent of the ng-repeat scopes you want to target).
<div
class="row"
ng-repeat="friendRow in friends | partition:2"
ng-click="collapse()"
>
JS:
$scope.collapse = function() {
this.isExpanded = !this.isExpanded;
};
If you want to keep the ng-click directive on the item element instead of putting it on the row element as I have done, then you're dealing with another child scope because of that inner ng-repeat. Therefore, you will need to follow the "dot" rule so that the child scope can update the parent scope where the collapse directive is. This means you need to nest isExpanded in an object. In this example, I use ng-init="props = {}", and then use props.isExpanded. The dot rule works because the children share the same object reference to props, so the properties are shared rather than just copied, just like in normal JavaScript object references.
Live Demo
<div
class="row"
ng-repeat="friendRow in friends | partition:2"
ng-init="props = {}"
>
<div ng-repeat="item in friendRow" ng-click="collapse()">
{{item.name}} {{item.age}} years old.
</div>
<div collapse="!props.isExpanded">
some content
</div>
</div>
JS:
$scope.collapse = function(){
this.props.isExpanded = !this.props.isExpanded;
};
Update
We keep going through more and more issues with your project. You really just need to experiment/research and understand everything that's going on on a deeper level, or it will just be one question after another. I'll give it one last effort to get you on the right track, but you need to try in the basic concepts and go from there.
You could get past the issue of props reinitializing by putting $scope.expandedStates and then passing the $index of the current ng-repeat to your function (or just using it in the view) and setting a property of expandedStates like $scope.expandedStates[$index] = !$scope.expandedStates[$index]. With the nested ng-repeat as it is, you'll need to do $parent.$index so that you're associating the state with the row rather than the item.
However, you'll then have another problem with the filter: Using my old partition code, the inputs inside the partitions are going to lose focus every time you type a character. Using the new code, the view updates, but the underlying model will not. You could use the partition filter from this answer to solve this, but from my understanding of that code, it could have some unexpected behavior down the road and it also requires passing in this as an argument to the filter. I don't recommend you do this.
Filters are meant to be idempotent, so stabilizing them via some kind of memoization is technically a hack. Some argue you should never do this at all, but I think it's fine. However, you definitely should ONLY do this when it is for display purposes and not for user input! Because you are accepting user input within the partitioned view, I suggest partitioning the data in the controller, then joining it back together either with a watch (continuous) or when you need to submit it.
$scope.partitionedFriends = partitionFilter($scope.friends, 2);
$scope.$watch('partitionedFriends', function(val) {
$scope.friends = [].concat.apply([], val);
}, true); // deep watch
I'm working on a radio button list where a user can select from a pre-populated list of problems, or select an "other" radio button and then type in their specific problem.
I can get the pre-populated list of radio buttons to work and set the problem (outputting the scope variable confirms this), but introducing the "other" functionality is stumping me. When I select other, it doesn't seem to bind to the scope variable. I noticed in the dom it's missing an class="ng-scope" that the other radio buttons seem to get from the ng-repeat, but I'm not sure if that's the problem.
<form>
// This part loops through the list of problems and makess radio buttons
<div ng-repeat="problem in selectedType['nature_of_problem']">
<input type="radio" ng-model="$parent.natureOfProblem" ng-value="problem"/>
</div>
// Ideally this part is where the "other" radio is, it's still in the form
<input type="radio" ng-model="natureOfProblem" ng-value="other" ng-checked="">
</form>
Working JSFiddle:
http://jsfiddle.net/HB7LU/3794/
I saw a few issues, among them:
Using ng-value instead of plain old value for "other"
Using a primitive instead of dot notation (if you want your view to reliably write a variable, it needs to be something.yourVariable instead of just plain old yourVariable)
Hope this helps!
function MyCtrl($scope) {
$scope.uiState = {};
$scope.uiState.natureOfProblem = 1;
$scope.selectedType = {};
$scope.selectedType.nature_of_problem = [1,2,3];
}
<div ng-controller="MyCtrl">
<p>Nature of problem is: {{uiState.natureOfProblem}}</p>
<form>
<div ng-repeat="problem in selectedType['nature_of_problem']">
<input type="radio" ng-model="uiState.natureOfProblem" ng-value="problem"/><span ng-bind="problem"></span>
</div>
<input type="radio" ng-model="uiState.natureOfProblem" value="Other" /><span>Other</span>
</form>
</div>
EDIT to answer OP's questions:
I tend to use ng-bind out of habit -- in slower browsers like Firefox, it keeps "{{blah}}" from showing up on the screen as everything loads. Newer versions of Angular also have ng-cloak for this purpose, which I should probably get in the habit of using instead. :) (I also vaguely remember reading that "{{blah}}" can cause issues in IE, but I very possibly made that up.)
The use of dot notation relates to the fact that Angular can't maintain data bindings on brand-new objects. To try to explain it without using terms like "scope" and "inheritance": If you influence an existing object by changing yourObject.anAttribute, the overarching object consistently exists throughout that process and does not drop its binding. But if you have blahVariable that is equal to 8, and you set blahVariable equal to 7, you've basically tossed the old piece of data and created a new piece of data entirely. This new piece does not maintain the binding, so the controller never gets the memo from the view that the value has changed.
Sometimes I find this useful, actually -- you can briefly manipulate a variable in the view for some quick-and-dirty purpose without the controller finding out about it. :)
Is there a way to have a HTML-view with pre-populated values from the server, and then get AngularJS to read those values into it's $scope?
I'm thinking of a scenario where the HTML is like this:
<div ng-controller="TestController">
<div ng-bind="title">Test Title</div>
<div ng-bind="itemCount">33</div>
<div ng-repeat="item in items">
<div ng-bind="item.title">Item 1 Title</div>
</div>
</div>
<button ng-click="update()">Update</button>
And the JavaScript is like this:
function TestController($scope) {
$scope.update = function() {
console.log($scope.title); // Should log "Test Title"
};
}
The thought behind this is to let the server render HTML that search engines can index, but have a JavaScript-model-representation of the content for manipulation through JS.
While ng-init is one solution, it requires you to explicitly set the value. So here is an alternative solution.
http://plnkr.co/edit/pq8yR9zVOHFI6IRU3Pvn?p=preview
Note : This solution wont work for ng-repeat. Control flow directives cant be used with this. But for simple extraction of information from ng-bind this works pretty well. All that you need to do is add the default directive ( code in plunk ) to wherever you are doing the bind and it will extract the text content and push it to the scope variable.
EDIT (solution with ng-repeat):
So, I was thinking of a way to make ng-repeat also work the same way. But getting ng-repeat to work like this isnt an easy job ( see the code for proof :P ). I have finally found a solution - here you go :
http://plnkr.co/edit/GEWhCNVMeNVaq9JA2Xm2?p=preview
There are a couple of things you need to know before you use this. This hasnt been thoroughly tested. It only works for repeating over arrays ( not objects ). There could be cases that have not been covered. I am overriding ngRepeat itself which could have other consequences. When you loop through the items ( in your server side code ) dont forget to add default="true" on the first element and default on the rest of the elements.
Hope this helps.
Add ng-init to your elements with the value so that it will work the way you want.
http://docs.angularjs.org/api/ng.directive:ngInit
I think what you really want is to make your application searchable by serving static files in parallell. Read more about it here http://www.yearofmoo.com/2012/11/angularjs-and-seo.html
I'm building an AngularJS app and I have ran into an issue. I have been playing with the framework for a while and I have yet to see documentation for something like this or any examples. I'm not sure which path to go down, Directive, Module, or something that I haven't heard of yet...
Problem:
Basically my app allows the user to add objects, we will say spans for this example, that have certain attribute's that are editable: height and an associated label. Rather than every span have its own dedicated input fields for height and label manipulation I would like to use one set of input fields that are able to control all iterations of our span object.
So my approx. working code is something like this:
<span ng-repeat="widget in chart.object">
<label>{{widget.label}}</label>
<span id="obj-js" class="obj" style="height:{{widget.amt}}px"></span>
</span>
<button ng-click="addObject()" class="add">ADD</button>
<input type="text" class="builder-input" ng-model="chart.object[0]['label']"/>
<input type="range" class="slider" ng-model="chart.object[0]['amt']"/>
The above code will let users add new objects, but the UI is obviously hardcoded to the first object in the array.
Desired Functionality:
When a user clicks on an object it updates the value of the input's ng-model to bind to the object clicked. So if "object_2" is clicked the input's ng-model updates to sync with the object_2's value. If the user clicks on "object_4" it updates the input's ng-model, you get the idea. Smart UI, essentially.
I've thought about writing a directive attribute called "sync" that could push the ng-model status to the bound UI. I've though about completely creating a new tag called <object> and construct these in the controller. And I've thought about using ng-click="someFn()" that updates the input fields. All of these are 'possibilities' that have their own pros and cons, but I thought before I either spin out on something or go down the wrong road I would ask the community.
Has anyone done this before (if so, examples)? If not, what would be the cleanest, AngularJS way to perform this? Cheers.
I don't think you need to use a custom directive specifically for this situation - although that may be helpful in your app once your controls are more involved.
Take as look at this possible solution, with a bit of formatting added:
http://jsfiddle.net/tLfYt/
I think the simplest way to solve this requires:
- Store 'selected' index in scope
- Bind ng-click to each repeated span, and use this to update the index.
From there, you can do exactly as you proposed: update the model on your inputs. This way of declarative thinking is something I love about Angular - your application can flow the way you would logically think about the problem.
In your controller:
$scope.selectedObjectIndex = null;
$scope.selectObject = function($index) {
$scope.selectedObjectIndex = $index;
}
In your ng-repeat:
<span ng-repeat="widget in chart.object" ng-click="selectObject($index)">
Your inputs:
<input type="text" class="builder-input" ng-model="chart.object[selectedObjectIndex]['label']"/>
<input type="range" class="slider" ng-model="chart.object[selectedObjectIndex]['amt']"/>