I am trying to create a dynamic form that includes the Radio Buttons.
<div *ngFor="let opt of question.options">
<input [formControlName]="question.key" [value]="opt.key" [type]="question.controlType" [id]="opt.key" [name]="question.key"/>
<label [htmlFor]="opt.key">{{opt.value}}</label>
</div>
But the value attribute is empty in the HTML when the Page is loaded. What could the possible reason ?
<input _ngcontent-mjy-c129="" ng-reflect-name="gender" type="radio" value="" id="male" name="gender" class="ng-invalid ng-dirty ng-touched">
This problem was solved after removing the FormControl from the input elements. I think the initial value of form control was overriding the new values which I was trying to set.
Be sure you call data before initializing the form
Related
I got radio inputs, rendered using the structural directive ngFor.
<form>
<label *ngFor="let user of staffMembers" class="stuff" for="user.username">
{{user.username}}
<input type="radio" [name]="user.username" [value]="user.username">
</label>
</form>
I got the inputs correctly but i can check multiple fields like checkbox. It's not the default behavior for radio inputs.
Because you are creating a new radio group with each line, not a new radio option. The input [name] is the name of the radio group, NOT the option.
<form>
<label *ngFor="let user of staffMembers" class="stuff" for="staffMembers1">
{{user.username}}
<input type="radio" id="staffMembers1" name="staffMembers" [value]="user.username">
</label>
</form>
The name shouldn't be unique to get the normal behavior, otherwise, it's just radio with only one possibility.
<input type="radio" name="user" [value]="user.username">
You need to give all radio inputs the same name:
https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input/radio
Right now it seems each radio input gets a different one since user.username is always different.
I have the following form, where users can choose to enter either the ID or the name:
<label for="ID"><input type="radio" name="Member" id="ID"> Member ID <input id="MemberID"></label><br/>
<label for="Name"><input type="radio" name="Member" id="Name"> Last Name <input id="LastName"></label>
When I click on "Member ID or Last Name, this switches the radio buttons. However when I click on the text inputs, this has no effect on the radio buttons.
Is this the expected behavior? If so, is there any way to tweak the html to make it work?
Note: this is not a JavaScript question.
Fiddle: https://jsfiddle.net/3by5wqzw/
Yes, this seems to be the expected behaviour on chrome, microsoft edge and firefox on windows 10 and on chrome for android lollipop.
You can use a bit of javascript to solve the problem:
<label for="ID"><input type="radio" name="Member" id="ID"> Member ID <input id="MemberID" onclick="document.getElementById('ID').checked = true;"></label><br/>
<label for="Name"><input type="radio" name="Member" id="Name"> Last Name <input id="LastName" onclick="document.getElementById('Name').checked = true;"></label>
When you click on a text input, the client will automatically check the matching radio button looking it up by its id.
As an alternative, you could put the Javascript code in a function, so it looks better and is easier to edit if you have lots of radio buttons with text input associated with it:
function check_radio(element_id){
document.getElementById(element_id).checked = true;
}
<label for="ID"><input type="radio" name="Member" id="ID"> Member ID <input id="MemberID" onclick="check_radio('ID');"></label><br/>
<label for="Name"><input type="radio" name="Member" id="Name"> Last Name <input id="LastName" onclick="check_radio('Name');"></label>
In regular html, radio input types are not related to anything other than the label associated with it. Therefore any other input text fields before or after need to be hooked up via some sort of javascript.
I think I found the answer.
The w3 recommendation states:
In an HTML document, an element must receive focus from the user in order to become active and perform its tasks
The issue is that when the user clicks on the text input, the radio button loses focus and is not activated.
Source (html4): http://www.w3.org/TR/html4/interact/forms.html#focus
I have an input type of radio, when using Angular to wire up the backend. However, it is currently allowing multiple selections, which is completely odd since radio is by default single selection.
<div ng-repeat="s in survey">
<input type="radio" data-ng-model="s.isSelected">{{s.id}}
</div>
Has anyone run into this, or notice something I am missing?
Assign a name attribute with the same value to all radiobuttons in the same group.
ex:
<input type="radio" name="group1" data-ng-model="s.isSelected">{{s.id}}
Suppose this checkbox snippet:
<input type="checkbox" value="1">Is it worth?</input>
Is there any reason to statically define the value attribute of checkboxes in HTML? What does it mean?
I hope I understand your question right.
The value attribute defines a value which is sent by a POST request (i.e. You have an HTML form submitted to a server).
Now the server gets the name (if defined) and the value.
<form method="post" action="urlofserver">
<input type="checkbox" name="mycheckbox" value="1">Is it worth?</input>
</form>
The server would receive mycheckbox with the value of 1.
in PHP, this POST variable is stored in an array as $_POST['mycheckbox'] which contains 1.
I just wanted to make a comment on Adriano Silva's comment.
In order to get what he describes to work you have to add "[]" at the end of the name attribute, so if we take his example the correct syntax should be:
<input type = "checkbox" name="BrandID[]" value="1">Ford</input>
<input type = "checkbox" name="BrandID[]" value="2">GM</input>
<input type="checkbox" name="BrandId[]" value="3">Volkswagen</input>
Then you use something like: $test = $_POST['BrandID']; (Mind no need for [] after BrandID in the php code).
Which will give you an array of values, the values in the array are the checkboxes that are ticked's values.
Hope this helps! :)
One reason is to use the ease of working with values in the system.
<input type="checkbox" name="BrandId" value="1">Ford</input>
<input type="checkbox" name="BrandId" value="2">GM</input>
<input type="checkbox" name="BrandId" value="3">Volkswagen</input>
When the form is submitted, the data in the value attribute is used as the value of the form input if the checkbox is checked. The default value is "on".
$('form').on('change', update).trigger('change')
function update() {
var form = $(this)
form.find('output').text('→ ' + form.serialize())
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<form>
<input type="checkbox" name="foo">
<output></output>
</form>
<form>
<input type="checkbox" name="foo" checked>
<output></output>
</form>
<form>
<input type="checkbox" name="foo" value="1" checked>
<output></output>
</form>
<form>
<input type="checkbox" name="foo" value="bananas" checked>
<output></output>
</form>
For the sake of a quick glance answer, from MDN
when a form is submitted, only checkboxes which are currently checked are submitted to the server, and the reported value is the value of the value attribute
It can be confusing because seeing something like
<input type='checkbox' name='activated' value='1'> might lead one to believe that the 1 means true and it will be treated as though it is checked, which is false. The checked attribute itself also only determines if the checkbox should be checked by default on page load, not whether it is currently checked and thus going to be submitted.
I'm trying to program a dynamic form, so I can't use the normal form tags and stuff. I use normal buttons, JQuery, and AJAX calls to simulate a traditional form. However, I can't figure out how to do radio buttons. Any help?
EDIT: Yeah, I suppose I should have been more specific. I tried doing
<input type="radio" />
and stuff, but:
it lets me select more than one button at a time (which kind of defeats the point of radio buttons)
it won't let me deselect a button after it's pressed!
EDIT 2: The reason I'm not using form tags is that I need multiple submit buttons as well, and the only solution I found to that dilemma was to not use form tags.
Why can't you use the form tag? There is nothing stopping you from doing so. But if you don't want to use the form tag, why not:
<input type='radio' name='test' value='1' checked>
<input type='radio' name='test' value='2'>
<input type='radio' name='test' value='3'>
<input type='radio' name='test' value='4'>
Works fine for me. Demo
Edit:
1: You need to specify a name for the radio group, otherwise each input is considered its own group. Hence why you can select more than one button at a time when using <input type="radio" />. Look at my code above. The radio group is 'test'.
2: Radio buttons are suppose to have a default value. When you create a radio group you should be specifying a default value with the checked attribute. A consequence of this is that you can't deselect a radio button. You can either choose a different value or stick with the default. If you want to be able to deselect, then consider using checkboxes instead. I've updated the example code to reflect this.
If you are able to select more than one radio button, its sounds like your name attributes are not matching. What you want to end up with is something like the following:
<input type="radio" name="group-1" value="something-unique">
<input type="radio" name="group-1" value="something-else-unique">
<input type="radio" name="group-1" value="another-unique-something">
<input type="radio" name="group-2" value="something-unique">
<input type="radio" name="group-2" value="something-else-unique">
<input type="radio" name="group-2" value="another-unique-something">
Note that the name attribute is the same for the group of options, which means that the selections will replace each other.
Also, I haven't had any issues not wrapping radios in form tags, when using them purely with javascript, however if you want to do any html post stuff, I would expect that they are required.
You can try this:
HTML
<div>
<ul>
<li><input type="radio" name="radio" value="value1" checked>Radio Button1</input></li>
<li><input type="radio" name="radio" value="value1">Radio Button2</input></li>
<li><input type="radio" name="radio" value="value1">Radio Button3</input></li>
</ul>
</div>
DEMO
There should not be an input element without a form element. You are not going to get the HTML to respond the way you want it to if you do not use it correctly. Multiple submit buttons would indicate the need for multiple forms.
If, for whatever reason, that does not work, perhaps you should reconsider the format through which you are asking the user to submit information.