I'm wrapping my head around forms and ngModel currently. So far everything works great except for the radio buttons.
They are loaded and all but I can't manage to read the touched state.
I guess it is because they are generated within a for loop and therefore can't be referenced
<fieldset [ngClass]="{'has-error': someReference.touched
&& someReference.invalid}">
<legend>Salutation</legend>
<div>
<label for="salutation_m">
<input id="salutation_m" name="salutation" type="radio"
[ngModel]="registration.salutation" #someReference="ngModel">
<span>Mister</span>
</label>
</div>
</fieldset>
So far it looks like the reference can't be read. I don't get any errors but even when the element is touched and invalid the class is not set.
Any hints on what I'm doing wrong?
Update
Changed #someReference to #someReference="ngModel" which solves the problem for predefined radio buttons but not for generated ones inside of a for loop.
I'm guessing in the case of a for loop there is a problem with the scope.
Related
I want to use custom templates for the tree nodes as shown here on their website
https://angular2-tree.readme.io/docs/templates
But I also need the checkbox tri-state functionality as demonstrated here
https://angular2-tree.readme.io/docs/tri-state-checkboxes
In this custom treeNodeFullTemplate example they have a checkbox as part of the template but it doesn't have the tri-state relationship between the parents and children. Is there a way to have a custom checkbox and keep all the correct event listeners etc.? I can't seem to find any documentation on the checkboxes API if there is one.
<tree-root id="tree" [focused]="true" [nodes]="nodes">
<ng-template #treeNodeFullTemplate let-node let-index="index" let-templates="templates">
<div class="tree-node">
<input type="checkbox" [checked]="node.isActive" (change)="node.toggleActivated(true)" />
<tree-node-expander [node]="node"></tree-node-expander>
<div
class="node-content-wrapper"
[class.node-content-wrapper-active]="node.isActive"
[class.node-content-wrapper-focused]="node.isFocused"
(click)="node.toggleActivated(true)">
<span [class]="node.data.className + 'Index'">{{ index }}</span>
<span [class]="node.data.className" [class.title]="true">{{ node.data.title }}</span>
</div>
<tree-node-children [node]="node" [templates]="templates"></tree-node-children>
</div>
</ng-template>
</tree-root>
I can see that the (change) method on the checkbox is not right but do I need to write my own one to get the parent and children and determine state on click? It seems strange that I can't just tap into an existing API.
I want to build some dynamic form fields.
When I put an *ngIf in fron of the div the material design does not work properly (no effects etc.).
Here is the input field that works
<div class="mdl-textfield mdl-js-textfield mdl-textfield--floating-label">
<input class="mdl-textfield__input" type="number" id="playerCount" [(ngModel)]="playerCount" (ngModelChange)="setPlayerCount(playerCount)">
<label class="mdl-textfield__label" for="playerCount">Anzahl Spieler</label>
</div>
and the one that does not work
<div *ngIf="players" class="mdl-textfield mdl-js-textfield mdl-textfield--floating-label">
<input class="mdl-textfield__input" type="text" id="stuff">
<label class="mdl-textfield__label" for="stuff">stuff</label>
</div>
The second div should appear as soon as the first has been filled out.
You have to register new elements to MDL's componentHandler since *ngIf actually removes the element from the dom, you have to register that element every time Angular removes/inserts it.
You can either call componentHandler.upgradeAllRegistered(); every time *ngIf inserts the element or replace *ngIf with something that is just hides the element but not remove it.
I want to replace label with input textbox and vice versa by clicking a button in Angular 2. I knowi have to use ngIf of somekind, but i am a little bit confused on how to do.
HTML:
<form>
<div class="information">
<label *ngIf="editMode">{{textValue}}</label>
<input *ngIf="editMode" [ngModel]="name">
<button (click)="editMode=true">Edit</button>
<button (click)="editMode=false">Save</button>
</div>
</form>
The only thing you need to add to one of your *ngIf's, is exclamation mark:
<label *ngIf="!editMode">{{textValue}}</label>
which means that label is shown when editMode is false. The exclamation mark is the NOT operator, which is used as truth tests on a variable. More here: What does an exclamation mark before a variable mean in JavaScript
I’m having a hard time figuring out how to iterate over a ControlArray that contains Controlgroups in a template. In TypeScript, so far I have created the ControlArray, and by iterating over data received from a remote service, I added a few ControlGroups to the array. Everything fine up to this point, and I can see the expected data structure in the console.
In the template, I have this:
<div *ngFor="#c of categories.controls">
<div ngControlGroup="c">
</div>
</div>
... where categories is the ControlArray (which holds an array of ControlGroups in its controls property). When I leave out the inner <div>, I don’t get an error, which suggests that Angular agrees with me that categories.controls is indeed an array. But as soon as I re-add the inner <div> (where I expect the local variable c to be one of the objects in the array), I get an exception with message “Cannot find control 'c' in [c in ]”. Also, I tried various other syntactical approaches, but none of them worked. In addition to a “Cannot find control …” method I also got “Cannot find a differ supporting object …”, but that didn’t take me any further.
Any hints regarding what I’m doing wrong?
ngControlGroup is defining a new control group. If I understand your question correctly, you want to actually be editing items within a control group inside a control array. Check out this plnkr: https://plnkr.co/edit/3gM2TuMGBW13HNATUcCO
<div *ngFor="#c of categories.controls; #i = index">
Control group {{i}}:
<div>
<input type="text" class="form-control m-b" [ngFormControl]="c.controls.title"/>
<input type="text" class="form-control m-b" [ngFormControl]="c.controls.id"/>
</div>
</div>
One error is
ngControlGroup="c"
which doesn't do any binding. It passes the literal c to ngControlGroup. It should be:
[ngControlGroup]="c"
The errors that are still produced after this fix seem because there are no controls.
Error is resolved by changing
ngControlGroup="c"
into
attr.ngControlGroup="c"
Because by assigning c to ngControlGroup you are just assigning the value instead of any binding. but strange why [ngControlGroup] still produces some error.apart from these here is working example
https://plnkr.co/edit/Yw21a1aSivNg4G6gYkhF?p=preview
Assuming that i have the following data in my params
params:[input:[1, 2, 3]]
And i have the following form in my Grails app
<div class="block1">
<label class="control-label">
<g:message code="input.label" default="Input"/>
</label>
<div class="controls">
<g:textField id="input1" name="input" value="${input}" readonly="${actionName != 'show' ? false : true}"/>
</div>
</div>
<div class="block2">
<label class="control-label">
<g:message code="input.label" default="Input"/>
</label>
<div class="controls">
<g:textField id="input2" name="input" value="${input}" readonly="${actionName != 'show' ? false : true}"/>
</div>
</div>
<div class="block3">
<label class="control-label">
<g:message code="input.label" default="Input"/>
</label>
<div class="controls">
<g:textField id="input3" name="input" value="${input}" readonly="${actionName != 'show' ? false : true}"/>
</div>
</div>
The form design above is correct, because in my form design, there will be several inputs of the same name (but each will be saved to the database under different primary keys) and it can be increases and decreases according to user selection.
Few questions using the above
How do i make it so that the value for input1 is params.input[0], input2 is params.input[1] and input3 is params.input[2] in the view? I can pass the model from controller without problem, but i couldn't distribute the value properly to each input on the form.
Is there any way to change the value ${input} dynamically? As in if i want to change the value to ${input[0]} or ${input[1]}
Can i automatically set the amount of block appended into the form using the g:each tag? Say like if from controller i want to set the rendering block amount to 3, so can i use the g:each tag to render the block 3 times in the form?
Thanks
The links are examples of how to use ajax/jquery to get values from a remote call and replace html element (divId) within a page - this divId could be the entire
<input type="text" name="input" value="newvalue"/>
upon triggering some form of call as above to get the new value.. in regards to
g:textField
yes it works like all other grails tags in the end they are transformed back to the correct HTML terminology...
The actual variable value is dynamic if you defined
<input name="existingvariable" value="${something}" ...
where something was a parameter from the given controller - and then you updated the call so
://YOURHOST:8080/yourapp/controller?existingvariable=newvalue
and refreshed or clicked this link which is what ajax would be doing for you doing a new call to either another controller to generate new values or same and passing new value to it and then grabbing data and pushing it back onto the divId ... (all in the background)
Groovy loading into divs
Grails - Select menu not rendering
I want my selects dropdowns to auto populate with Ajax in Grails website
The above are all related to using ajax to populate / update existing form elements
If you wish to update a live form with a new live value (non existant in DB) take a look at modaldynamix plugin. //github.com/vahidhedayati/modaldynamix