I am new to Angular2/Typescript, since I come from the Java world, I decided to learn Typescript and Angular2 directly.
I want to leave most of the logic on the server, thus I don't need complex validation management on the client. So all I want is the user to fill out forms, and post/put all the fields to the REST Service.The goal is to leave the client side as light as possible.
I have a form:
<form role="form" (ngSubmit)="onSubmit()" #ArbeitstagForm="ngForm">
and a field in it, some datepickers too: similar like this:
<input type="text" class="form-control pull-right" id="datepicker" [(ngModel)]="model.datum">
When I submit the form, I call this function:
model = new Arbeitstag();
onSubmit(form:any) {
alert(JSON.stringify(this.model));return false;
}
So that alerts me the the entered data as JSON, which I will after send to a REST Service. It works actually great, BUT only when I actually type something into the field, when I have a default value, or I set the field with a datepicker, the model object values will remain empty.
I've found out about the dirty setting of the fields, which are false by default and are getting true when I type something in and that's also what I see when I check firebug, but that's definitely not what I want to achieve.
Is there a way to set all the fields dirty in a form in Angular2? I've found many examples for Angular.js 1, but not for Angular2/Typescript.
Control has a markAsDirty() (and markAsTouched()) method
<input #datePicker="ngForm" type="text" class="form-control pull-right" id="datepicker" [(ngModel)]="model.datum">
<button (click)="datePicker.control.markAsDirty()">update dirty status</button>
Plunker example
What I usually do is get a reference to the form in my component, using ViewChild. With that reference I can mark to form dirty or touched when I need to. Like so:
export class MyComponent implements OnInit, OnDestroy {
#ViewChild('form') form: NgForm;
...
public methodWithFormChange(): void {
this.form.control.markAsDirty();
}
}
;-)
Related
I have a form, this form needs to post some data to my backend. With flux, what is the best practice for doing this, use a store?
My issue with using a store is that I have a sub component inside of my form that allows me to select a number 1-5 with buttons. I wanted that component to be reusable, but if i use a store, I have to hard code the store into the child component which means I cant really use it elsewhere. Instead do I just set the parent state from the child?
If anyone can point out some good tutorials or examples of react/flux forms let me know.
In my opinion any back end interaction should be done by using actions, but...
if you want to use store anyway then you can create additional attribute (prop) in your sub-component which will be a function (f.e. onChange) which should be passed from parent component as prop (this function should set data in store). Then you can reuse this component, because only parent needs to have access to store.
So in subcomponent:
onButtonClick(e) {
this.state.value = e.target.value;
if (this.props.onChange) this.props.onChange(e.target.value);
}
<div>
<button onClick={this.onButtonClick.bind(this)} value="1">1</button>
<button onClick={this.onButtonClick.bind(this)} value="2">2</button>
<button onClick={this.onButtonClick.bind(this)} value="3">3</button>
<button onClick={this.onButtonClick.bind(this)} value="4">4</button>
<button onClick={this.onButtonClick.bind(this)} value="5">5</button>
</div>
and in parent:
setMyStoreState(value) {
store.setNumber(value);
}
<Subcomponent onChange={this.setStoreState.bind(this)} />
or something like this.
Code not tested, but you should get the idea.
The bootstrap validator plugin helps validating the form fields providing a bunch of cool features. One of those features are the feedback icons, which defaults to glyphicon.
Suppose I want to replace glyphicon with font awesome.
The documentation says they can be changed by passing a "feedback" JSON object as data attribute or via JavaScript.
Via JavaScript it's easy. But as data attribute, it is unclear where and how exactly add it, because simply adding:
feedback: {
success: 'fa-check',
error: 'fa-times'
}
as data attribute to the <form> or the <div class="form-group"> or the <input> itself it doesn't work.
After some time struggling with it, I realized that the JSON feedback object should be added to the element and also it needs to be added using this syntax (which was not specified in the docs):
<form ... data-feedback='{"success": "fa-check", "error": "fa-times"}'>
Note the quotes syntax.
Also, if we are not just changing the glyphicon but replacing it with a font-awesome one (like in my example), in the <div class="form-group"> we need to replace:
<span class="glyphicon form-control-feedback" aria-hidden="true"></span>
with:
<span class="fa form-control-feedback" aria-hidden="true"></span>
This is not very well documented, and I could not make it work. I ended up using a different form validator which accomplish the same functionality and it's easier to configure success/error formats using bootstrap classes:
var validator = $('#submitForm').validate({
validClass: "is-valid",
errorClass: "is-invalid",
jQuery Validator
This application is for running a writing contest.
Coodinators are assigning entries to judges for them to judge. I have three sets of data I retrieve from the server, a judge list, an entries list and an assignment list that ties the two together. There can be a variable number of input fields...if a judge has agreed to judge 4 entries, there will be 4 inputs...if 7, then 7.
I have all of that working OK, but only insofar as the entry number can be input and the data updated.
Now I would like confirm that the entryID IS a valid ID by checking the list and also to show a field or two on the screen so the coordinator knows that they typed in the right entry.
The relevant section of the HTML
<div ng-app>
<div id="assignment" ng-controller="AssignData" ng-init="JudgeID=107;CategorySelect='MS';PublishSelect='P'">
<div ng-show="loaded">
<form class="entryform ng-cloak" name="assignform" ng-submit="sendForm()">
<p>Entry numbers assigned to this judge</p>
<p ng-repeat="assign in (formassigns =(assigns | filter:AssignedJudge))">
<input type="text" ng-model="assign.entryid" required/>
{{entries.authorname}} {{entries.entrytitle}}
</p>
<button type="submit">Save Assignments</button>
<p>This will keep the assignments attached to this judge.
You will be able to send all of your assignments to all
of your judges when you are finished.</p>
</form>
</div>
</div>
</div>
The part that I haven't been able to figure out is how to make entries.authorname and entries.entrytitle show up when the user types in an entryid that is in entries.entryid.
assigns and entries are both arrays of records using JSON
assigns is JSON made up of assigns.id, assigns.judgeid, assigns.entryid.
entries is JSON made up of entries.entryid, entries.entrytitle, entries.authorname
When assigns arrives, entryid is empty. The form is used to fill in the entryid and when it is filled in, I'd like to be able to show next to it the title and authorname for that entry.
NOTE: I've added some important information at the end of this answer. So please read to the end before you decide what you're going to do.
You're going to have to do something that does the look up.
Also a few other changes I'd add, mostly so you can actually validate the items in your repeat.
(There's a summary of what I did after the psuedo code below).
<div ng-app>
<div id="assignment" ng-controller="AssignData"
ng-init="JudgeID=107;CategorySelect='MS';PublishSelect='P'">
<div ng-show="loaded">
<form class="entryform ng-cloak" name="assignform" ng-submit="sendForm()">
<p>Entry numbers assigned to this judge</p>
<p ng-repeat="assign in (formassigns =(assigns | filter:AssignedJudge))"
ng-form="assignForm">
<input type="text" ng-model="assign.entryid"
ng-change="checkEntryId(assign, assignForm)"
name="entryid" required/>
<span ng-show="assignForm.entryid.$error.required">required</span>
<span ng-show="assignForm.$error.validEntry">
{{assignForm.$error.validEntry[0]}}</span>
{{assign.entry.authorname}} {{assign.entry.entrytitle}}
</p>
<button type="submit">Save Assignments</button>
<p>This will keep the assignments attached to this judge.
You will be able to send all of your assignments to all
of your judges when you are finished.</p>
</form>
</div>
</div>
</div>
Then in your controller, you'd add a function like so (be sure to inject $http or a service you wrote to pull the values from the server):
$scope.checkEntryId = function(assign, form) {
$http.get('/CheckEntry?id=' + assign.entryid,
function(entry) {
if(entry) {
assign.entry = entry;
form.$setValidity('validEntry', true);
} else {
form.$setValidity('validEntry', false, 'No entry found with that id');
}
}, function() {
form.$setValidity('validEntry', true, 'An error occurred during the request');
console.log('an error occurred');
});
};
The basic idea above:
Use ng-form on your repeating elements to allow for validation of those dynamic parts.
Create a function that you can pass your item and your nested form to.
In that function, make your AJAX call to see if the entry is valid.
Check the validity based on the response, and call $setValidity on your nested form you passed to the function.
Use ng-show on a span (or something) in your nested form to show your validation messages.
Also, assign your checked entry to your repeated object for display purposes. (you could use a seperate array if you want, I suppose, but that would probably get unnecessarily complicated).
I hope that helps.
EDIT: Other thoughts
You might want to wrap your call in a $timeout or some sort of throttling function to prevent the entry id check from spamming yoru server. This is an implementation detail that's totally up to you.
If this is a check you do all over the place, you'll probably want to create a directive to do it. The idea would be very similar, but you'll do the check inside of a $parser on the ngModelController.
The method I showed above will still actually update the model's entryid, even if it's invalid. This is usually not a big deal. If it is, you'll want to go with what I suggested in "other thought #2", which is a custom validation directive.
If you need more information about validation via custom directives I did a blog entry on that a while back
Posted this to Play user group; I account for the sole view, so hoping to get a view, or perhaps even an answer ;-)
Nested forms are great, but there's one glitch that adds boilerplate to either javascript or scala templates.
For example, given:
#inputText(field = _form("user.email"),
'_label-> "Email Address*",
'class-> "required email",
'placeholder-> "jdoe#gmail.com"
)
the generated input field is something like:
<input id="user_email" name="user.email" ...>
Now, when you want to validate the email address client-side you then have to reference DOM id: $('#user_email')
Where $('#email') would be more natural.
I know I can set the id attrib manually in the template but would prefer to, by default, have the nested name (user in this case) stripped out from the id attrib.
Looking in github views helper directory, I am not finding where I can get access to the generated id (i.e. which file I need to overload and how).
Anyone know how to pull this off and/or have a better approach?
Here is where the field's ID is auto-generated:
https://github.com/playframework/Play20/blob/master/framework/src/play/src/main/scala/play/api/data/Form.scala#L274
There's not really any way you can override that behaviour, but you could write your own #inputText helper that strips the "user_" part from the ID when generating the HTML.
Basically copy-paste the default helper and replace
<input type="text" id="#id" ...
with your own code, e.g.
<input type="text" id="#processFieldId(id)" ...
or (untested!):
<input type="text" id="#(id.split('_').last)" ...
Then just import your custom helper in your template, and use it just like you would use #inputText.
This has driven me really bananas. It's so simple and easy and yet I can't figure out what's wrong with it.
I want to get my checkbox value populated in my controller (for testing purposes).
Here is my form.
<a href='#' name='submitForm'>submit the form</a>
//I have jquery attached to this tag and will submit the form when user clicks it
echo form_open('test/show');
echo form_checkbox('checkbox[]','value1');
echo form_checkbox('checkbox[]','value2');
echo form_checkbox('checkbox[]','value3');
echo form_checkbox('checkbox[]','value4');
echo "<input type='text' name='text1' value='ddd'>";
echo form_close();
//My controller test
public function show(){
$data1=$this->input->post('text1');
//I can get text1 value from input box
$data2=$this->input->post('checkbox');
//it keeps giving me undefined index 'checkbox'
$data3=$_POST['checkbox'];
//same error message
//WTH is going on here!!!!!
}
Please help. This thing drives me nuts! Thanks.
UPDATE:
Thanks for the help. To be more precisely, my submit button is a <a> tag and outside of form tag. It appear that I have to include <a> tag inside my form tag to make them works. Is that true?
A checkbox will not submit any data if it is unchecked as they're not considered successful (as per the w3c specification here)
If you actually tick the box and submit, it'll work - in fact it does, I've just tested it.
You need to wrap calls to $_POST in the isset() function.
if( isset( $_POST['checkbox'] ) ) {}
Calling $this->input->post('checkbox') shouldn't give you an undefined index error as the method deals with this eventuality. the Input::post() method returns false or the value of the checkbox.
Edit --
In response to your amendment to your question, you must use an element of type input with the type attribute set to submit in order to submit your form data without the use of Javascript etc. This button must be INSIDE the <form></form> which you are intending to submit.
<input type="submit" value="Submit">
The type="submit" causes the browser to send the data as submit event occurs. If you wish to use another element insider or outside of the form to do this you need to use Javascript. This however can be disabled on a per browser/user basis and isn't reliable as a result.
// Standard Javascript
<form name="myform"...
<a onclick="javascript:document.myform.submit();" href="javascript:void(0)">Submit</a>
// jQuery
$('#my-a-tag-submit-button').live( 'click', function() {
$('#my-form').submit();
}