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How to associate two input fields?

I want to store the correct answer(option) and the other 3 options as well. But for the other 3 options I will store those in database saying is_correct(column) 0/no/False. But for that, I'll have to have such logic that will figure out which radio button is for which input field. How do I bind/map a radio input field to a text input field?
I can, extract values out of these elements but can't figure out the logic.
<div id="option" class="form-group">
<input type="radio" name="option" required/><input type="text" name="option_1" required/><br/><br/>
<input type="radio" name="option" required/><input type="text" name="option_2" required/><br/><br/>
<input type="radio" name="option" required/><input type="text" name="option_3" required/><br/><br/>
<input type="radio" name="option" required/><input type="text" name="option_4" required/>
</div>
I just can't figure out the next step! Seen similar types of posts but not so similar tbh despite the concept being same.

First off, I really don't understand why you use radio buttons and a input text. In my opinion, just switch the input text to labels, or if you want the user to type the answer just give him 1 input text.
That being said, keeping the design you've made:
HTML:
<div id="options" class="form-group">
<input type="radio" id="option_text" required/><input type="text" id="option_1" required/><br/><br/>
<input type="radio" id="option_text2" required/><input type="text" id="option_2" required/><br/><br/>
<input type="radio" id="option_text3" required/><input type="text" id="option_3" required/><br/><br/>
<input type="radio" id="option_text4" required/><input type="text" id="option_4" required/>
<button type="submit" id="sub">
Press me
</button>
</div>
<div id="output1">
</div>
<div id="output2">
</div>
<div id="output3">
</div>
<div id="output4">
</div>
Javascript:
$("#sub").on('click',function(){
let eachone=[];
eachone[0]=$("#option_1").val();
eachone[1]=$("#option_2").val();
eachone[2]=$("#option_3").val();
eachone[3]=$("#option_4").val();
$("#output1").html(eachone[0]+" - "+$("#option_text").prop("checked"))
$("#output2").html(eachone[1]+" - "+$("#option_text2").prop("checked"))
$("#output3").html(eachone[2]+" - "+$("#option_text3").prop("checked"))
$("#output4").html(eachone[3]+" - "+$("#option_text4").prop("checked"))
})
If you want to alter something, or test for your exact test case, here is the fiddle
Jfiddle.
Note I'm using jQuery, just for ease of code, you can change most of the jquery references to document.getElementById
Edit:
Updated fiddle with checkboxes: JFiddle
Edit2:
Updated fiddle with single option checkboxes:
Jfiddle2
Warning: the event created might break some other input type checkboxes you have in your code!

First I think you should use the value attribute of the radioButtons instead of the second input, just put the text in a span or a label :
<input type="radio" id="option1" name="option" value="option1">
<label for="option1">8</label>
then you can get the selected value by doing:
var selectedOption = null;
if (document.getElementById('option1').checked) {
selectedOption = document.getElementById('option1').value;
}
After that, you can query the db to see if the selected option is correct or not.

How about instead of submitting the form with form data, you submit a JSON string/object?
So, your object for question can be something like
{
"question" : "How many planets orbit around the sun?",
"options" : [{
"name" : "1",
"value" : "7",
"isAnswer" : false
}, {
"name" : "2",
"value" : "8",
"isAnswer" : true
}]
}
Now, what's left is to create this object when the submit button is clicked.
To do that, you can have ids such as
<input type="radio" id="radio-1" name="option" required/>
<input type="text" id="text-1" required/>
These elements can be created dynamically, or manually if you are making the page just for a single question.
Now, when the button to submit the form, is clicked, you can run the below code which constructs a JSON object.
let question = {};
question.question = $("#question").val(); //Assuming you are using jQuery and id for question input box is question.
question.options = [];
for(i=0; i<4; i++) {
let option = {};
option.name = (i+1); //convert to ascii if you want alphabets
option.value = $("#text-"+(i+1)).val();
option.isAnswer = $("#radio-"+(i+1)).checked;
question.options.push(option);
}
You can now send this question object to your server.

populate 'today + x days' as form input value [duplicate]

I am trying to use the innerHTML method on an input tag and all i get back is a blank string. Here is the code i am useing.
javascript
function setName(ID){
document.getElementById('searchtitle').innerHTML = "Enter " + ID.innerHTML;
}
HTML
<input type="radio" name="searchtype" id="test" value="name" onclick="setName(this)">Last Name</input><br/>
<input type="radio" name="searchtype" value="phonenumber" onclick="setName(this)">Phone Number</input><br/>
<label for="inputfield" id="searchtitle" style="font-size:2em;">Enter Last Name</label><br/>
<input type="text" name="inputfield" id="inputfield" style="font-size:2em;"></input>
What is supposed to happen is depending on which radio button I pick the label for the input box should change. I can make the label.innerHTML=radio.value but the values are named for my php code and not formated nicely(ie. phonenumber vs. Phone Number) this is why I am trying to use the innerHTML of the radio button.
Any help I could get would be greatly appriciated.

you should embed input inside of label tag. input tag should closed by />. It's semantic HTML. When you do this clicking on label activate the input. InnerHTML only works for label then. It will return you label value.
<label for="inputfield" id="searchtitle" style="font-size:2em;">Enter Last Name
<input type="text" name="inputfield" id="inputfield" style="font-size:2em;" />
</label>
JavaScript:
console.log(document.getElementById('searchtitle').innerHTML); // returns 'Enter Last Name'

If you want the value of an input tag, you want to use .value.

First, add labels around your inputs. Second, use getName(this.parentNode). Finally, call innerText instead of innerHtml.
<html>
<head>
<script>
function setName(el){
document.getElementById('searchtitle').innerHTML = "Enter " + el.innerText;
}
</script>
</head>
<body>
<label><input type="radio" name="searchtype" value="name" onclick="setName(this.parentNode)"/>Last
Name</label><br/>
<label><input type="radio" name="searchtype" value="phonenumber" onclick="setName(this.parentNode)"/>Phone
Number</label><br/>
<label for="inputfield" id="searchtitle" style="font-size:2em;">Enter Last Name</label><br/>
<input type="text" name="inputfield" id="inputfield" style="font-size:2em;"></input>
</body>
</html>

Complete edit.
Ok, I figured out what you were looking for. First off, you've got to fix your HTML (don't put text inside of an input... and don't next an input inside of a label).
<label for="test">Last Name</label>
<input type="radio" name="searchtype" id="test" value="name" onclick="setName(this)" />
<br/>
<label for="test2">Phone Number</label>
<input type="radio" id="test2" name="searchtype" value="phonenumber" onclick="setName(this)" />
<br/>
<label for="inputfield" id="searchtitle" style="font-size:2em;">Enter Last Name</label>
<br/>
<input type="text" name="inputfield" id="inputfield" style="font-size:2em;" />
JavaScript (in Jquery, for brevity):
function setName(elem)
{
$('#searchtitle').html('Enter ' + $('label[for="'+elem.id+'"]').html());
}

You have closed the Input tag improperly with </input>
this should be
<input type="radio" name="searchtype" id="test" value="name" onclick="setName(this)"/>Last Name<br/>
<input type="radio" name="searchtype" value="phonenumber" onclick="setName(this)"/>Phone Number<br/>

I have two radio button but the the form only can get one radio value even we choose different radio

I want to get the value from radio button that we have choose then multiple with the number in grossSalary. The result will be display on a textbox called epf. There are an error happening, the form only get 0.09 value even we choose 11% radio button.
Here is my javascript
<script>
function get(percent)
{
var percent = document.getElementById('percent').value;
var grossSalary= document.getElementById('grossSalary').value;
var epf = parseFloat(percent)*parseFloat(grossSalary);
epf = epf.toFixed(2);
document.getElementById('epf').value = epf;
}
</script>
Here is my form coding:
<div class="form-group">
<label>Gross Salary</label>
<input type="text" class="form-control" id="grossSalary" name="gross_salary">
</div>
<div class="form-group">
<label>EPF</label>
<input type="radio" id="percent" name="percent" value="0.09" onclick="get(this.value)">9%
<input type="radio" id="percent" name="percent" value="0.11" onclick="get(this.value)">11%
<input type="text" id ="epf" class="form-control" name="epf" >
</div>
</form>

You could use the name instead of the id (because id has to be unique). Also, with jQuery, you could use the change event.
i.e. :
HTML :
<div class="form-group">
<label>Gross Salary</label>
<input type="text" class="form-control" id="grossSalary" name="gross_salary">
</div>
<div class="form-group">
<label>EPF</label>
<input type="radio" name="percent" value="0.09">9%
<input type="radio" name="percent" value="0.11">11%
<input type="text" id ="epf" class="form-control" name="epf" >
</div>
JS :
$("input[name=percent]").change(function() {
var percent = $(this).val();
var grossSalary= $("#grossSalary").val();
var epf = parseFloat(percent)*parseFloat(grossSalary);
$("#epf").val(epf.toFixed(2));
});
Here is the working example on JSFiddle.
Hope it helps.
EDIT Don't forget to include jQuery source in your html file :
One file template :
<script src="https://code.jquery.com/jquery-3.1.1.min.js"></script>
<div class="form-group">
<label>Gross Salary</label>
<input type="text" class="form-control" id="grossSalary" name="gross_salary">
</div>
<div class="form-group">
<label>EPF</label>
<input type="radio" name="percent" value="0.09">9%
<input type="radio" name="percent" value="0.11">11%
<input type="text" id ="epf" class="form-control" name="epf" >
</div>
<script>
$("input[name=percent]").change(function() {
var percent = $(this).val();
var grossSalary= $("#grossSalary").val();
var epf = parseFloat(percent)*parseFloat(grossSalary);
$("#epf").val(epf.toFixed(2));
});
</script>

When you are using JS or Jquery than always remember one key point that:
id: used for single selection
class: used for multiple selection
In your case you are using same id for different tags, in that case it returns the first matching html value.
So to get rid of this, you have to use class and iterate over them and get the values.

jQuery - Checking value of various input types

I have no idea what I'm doing wrong here. I have a form with radio buttons and simple text fields. I'm checking to see if there is a value within the form fields or if either of the radio buttons have been checked. If there is no value add a red color to the label. If they have a value I'm adding back the default black. But for some reason no matter if I put a value in the text field it stays red. Also kind of strange but if I check the first checkbox the black text appears. Any help is greatly appreciated.
JS Fiddle: http://jsfiddle.net/5Sacj/
<form name="headerForm">
<label id="gender" for="gender">Gender</label>
<input type="radio" name="customer" value="male" />Male
<input type="radio" name="customer" value="female" />Female
<br/>
<label for="fname">*First Name</label>
<input type="text" class="text" id="fname" name="fname" />
<br/>
<label for="fname">*Last Name</label>
<input type="text" class="text" id="lname" name="lname" />
<input id="submit" type="submit" name="submit" value="submit"
</form>
JQUERY
$(document).ready(function() {
$("#submit").on('click', function() {
$(":text, :radio").each(function() {
if($(this).val() === '' || !$(this).is(':checked')){
$(this).prev('label').css('color','red');
} else {
$(this).prev('label').css('color','black');
}
});
});
});

That is because you are using or operator ||.
It will execute even if one is true. Try using && or have separate if condition for both.

jQuery to Validate an Input Text Control based on Radio Selection

How do I validate that the input text corresponding to the radio option is checked?
For example, using the image above:
If Contact 1's E-Mail radio option is selected, Contact 1's E-Mail text field cannot be blank, but Contact 1's Phone and US Mail text fields are still permitted.
If Contact 2's US Mail radio option is selected, Contact 2's US Mail text field cannot be blank, but Contact 2's Phone and E-Mail text fields are still permitted.
I have built the form above using the HTML below, but you can play with my Fiddle here: fiddle.
BEGIN UPDATE: I have a newer fiddle with better code here:
fiddle2
It has more instructions in the HTML and a closer attempt at my jQuery. For some reason, though, it still does not seem to be doing anything.
END UPDATE
I have tried naming the fields so that my jQuery can parse them, but that does not mean there is not a better way.
<body>
<form name="jp2code" action="#" method="POST">
<fieldset>
<legend>Contact 1</legend>
<span>
<input type="radio" id="group1_PhoneRadio" name="group1"/>
<label for="group1_PhoneText">Phone:</label>
<input type="text" id="group1_PhoneText" name="group1_PhoneText"/>
<br/>
<input type="radio" id="group1_EMailRadio" name="group1"/>
<label for="group1_EMailText">E-Mail:</label>
<input type="text" id="group1_EMailText" name="group1_EMailText"/>
<br/>
<input type="radio" id="group1_USMailRadio" name="group1"/>
<label for="group1_USMailText">US Mail:</label>
<input type="text" id="group1_USMailText" name="group1_USMailText"/>
</span>
</fieldset>
<fieldset>
<legend>Contact 2</legend>
<span>
<input type="radio" id="group2_PhoneRadio" name="group2"/>
<label for="group2_PhoneText">Phone:</label>
<input type="text" id="group2_PhoneText" name="group2_PhoneText"/>
<br/>
<input type="radio" id="group2_EMailRadio" name="group2"/>
<label for="group2_EMailText">E-Mail:</label>
<input type="text" id="group2_EMailText" name="group2_EMaiText"/>
<br/>
<input type="radio" id="group2_USMailRadio" name="group2"/>
<label for="group2_USMailText">US Mail:</label>
<input type="text" id="group2_USMailText" name="group2_USMailText"/>
</span>
</fieldset>
<div>
<input type="submit" name="submit" value="submit" />
</div>
</form>
</body>
What is the best way to write the jQuery?
I am new to jQuery, but I attempted my hand at it based on some Show/hide examples.
What I created below does not work, but hopefully indicates what I am trying to accomplish.
$(function() {
$("input[type='radio']").change(function() { // when a radio button in the group changes
var id = $(this).id;
var index = id.indexOf('group');
if (index == 0) { // is there a better way to do this?
var groupN_Len = 7; // Length of 'groupN_'
var radio_Len = 5; // Length of 'radio'
var preStr = id.substring(0, groupN_Len);
$"input[name*='preStr']".validate = null; // clear validation for all text inputs in the group
var postStr = id.substring(groupN_Len + 1, id.Length() + 1 - radio_Len); // extract Phone, EMail, or USMail
$(preStr+postStr+'Text').validate({ rules: { name: { required: true } } });
}
});
});

To make sure that the radiobutton is checked for each field, add attribute required="" in one of the radiobuttons for each fieldset.
demo

OK, whatever radio button is selected in the Contact Group's Contact Preferences, that corresponding text field is required.
Here is where I am so far on my jQuery checking:
EDIT:
Modified with tilda's important detail about adding '.' to the class name.
Added Required Attribute: how to dynamically add REQUIRED attribute to textarea tag using jquery?
Removed Required Attribute: jquery removing html5 required attribute
Final code works and looks like this:
<script type="text/javascript" src="http://ajax.aspnetcdn.com/ajax/jquery.validate/1.11.1/jquery.validate.js"></script>
<script type="text/javascript">
$(function() {
jQuery.validator.setDefaults({
debug: true,
success: "valid"
});
$("input[type='radio']").change(function() {
$('.'+$(this).attr('name')).each(function(index) {
$(this).removeAttr('required');
});
if($(this).is(':checked')) {
$('.'+$(this).attr('id')).each(function(index) {
$(this).prop('required',true);
});
}
});
$('#submit').click(function() {
$(this).validate();
});
});
Back to the HTML of the document: I did a lot of subtle editing to the text by creating specific ids and names for the radio buttons that matched up with the class names for the text controls.
Here is that end result:
<body>
<form name="jp2code" action="#" method="POST">
<div>For each field below, provide the Phone Number, E-Mail Address, and Street Address. <b>Indicate the preferred contact method using the radio button.</b></div>
<fieldset>
<legend>Contact 1</legend>
<span>
<input type="radio" id="group1_Phone" name="group1"/>
<label for="group1_Phone">Phone:</label>
<input type="text" name="group1_PhoneText" class="group1 group1_Phone" />
<br/>
<input type="radio" id="group1_EMail" name="group1"/>
<label for="group1_EMail">E-Mail:</label>
<input type="text" name="group1_EMailText" class="group1 group1_EMail" />
<br/>
<input type="radio" id="group1_USMail" name="group1"/>
<label for="group1_USMail">US Mail:</label>
<input type="text" name="group1_USMailText" class="group1 group1_USMail" />
</span>
</fieldset>
<fieldset>
<legend>Contact 2</legend>
<span>
<input type="radio" id="group2_Phone" name="group2"/>
<label for="group2_Phone">Phone:</label>
<input type="text" name="group2_PhoneText" class="group2 group2_Phone" />
<br/>
<input type="radio" id="group2_EMail" name="group2"/>
<label for="group2_EMail">E-Mail:</label>
<input type="text" name="group2_EMailText" class="group2 group2_EMail" />
<br/>
<input type="radio" id="group2_USMail" name="group2"/>
<label for="group2_USMail">US Mail:</label>
<input type="text" name="group2_USMailText" class="group2 group2_USMail" />
</span>
</fieldset>
<div>
<input type="submit" value="Send" id="submit"/>
</div>
</form>
</body>
Let me explain what is going on in the jQuery, using the HTML above:
When a radio button's checked state changes, each control with a class name that matches the radio button's name attribute has the required property removed.
If a radio button is checked (i.e. checked=true), then each control with a class name that matches the radio button's id attribute has the required property added.
Finally, the validator seems to have to be run on a single form control (not on individual text controls like I was doing).
Here is the sample Fiddle that I ended with: Fiddle v8
At tilda: You didn't say much, but what you did say helped a lot!