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Possible to embed html in an if statement?

Is it possible to embed html within javascript? I am trying to pass two different forms based on the input to a radio button. My question is this possible?
<script>
if(document.getElementById('hello').checked) {
<p> form 1 </p>
}else if(document.getElementById('goodbye').checked) {
<p> form 2</p>
}
</script>
<button onclick="">one or the other</button>

You could create an Object with templates forms.
Depending on the checked radio element, you simply reference the template by the checked radio element value:
const form_templates = {
contact: `<form action="/form_contact.php">
<label><span>First name:</span><input type="text" name="fname"></label>
<label><span>Last name:</span><input type="text" name="lname"></label>
<input type="submit" value="Submit">
</form>`,
newsletter: `<form action="/newsletter.php">
<label><span>Email:</span><input type="text" name="email"></label>
<input type="submit" value="Submit">
</form>`
};
const ELS_picker = document.querySelectorAll("[name=form-picker]");
const EL_picked = document.querySelector("#picked");
const pickForm = () => {
const ckd = [...ELS_picker].filter(el => el.checked)[0];
EL_picked.innerHTML = form_templates[ckd.value];
};
// On radio change
ELS_picker.forEach(el => el.addEventListener("change", pickForm));
// Init!
pickForm();
<h3>Select a form:</h3>
<label>Contact: <input type="radio" value="contact" name="form-picker" checked></label>
<label>Newsletter: <input type="radio" value="newsletter" name="form-picker"></label>
<div id="picked"></div>
Example with two forms already defined in the document and by using classList.toggle()
const ELS_picker = document.querySelectorAll("[name=form-picker]");
const pickForm = () => {
const ckd = ELS_picker.forEach(el => {
document.querySelector(`[id="form--${el.value}"]`).classList.toggle("u-none", !el.checked);
});
};
// On radio change
ELS_picker.forEach(el => el.addEventListener("change", pickForm));
// Init!
pickForm();
/* Utility classes */
.u-none {
display: none;
}
<h3>Select a form:</h3>
<label>Contact: <input type="radio" value="contact" name="form-picker" checked></label>
<label>Newsletter: <input type="radio" value="newsletter" name="form-picker"></label>
<form id="form--contact" class="u-none" action="/form_contact.php">
<label><span>First name:</span><input type="text" name="fname"></label>
<label><span>Last name:</span><input type="text" name="lname"></label>
<input type="submit" value="Submit">
</form>
<form id="form--newsletter" class="u-none" action="/newsletter.php">
<label><span>Email:</span><input type="text" name="email"></label>
<input type="submit" value="Submit">
</form>

You can do it, but you may have to inject like this:
<div id="form"></div>
<button onclick="">one or the other</button>
<script>
var formEl = document.getElementById('form');
if(document.getElementById('hello').checked) {
formEl.innerHTML = '<p> form 1 </p>';
}else if(document.getElementById('goodbye').checked) {
formEl.innerHTML = '<p> form 2</p>';
}
</script>

If you want to update the HTML on your JS code, you should use functions like document.createElement.
Check the section Creating and placing new nodes at this Mozilla's doc.

how to append hidden field value to input text field before submitting?

<form id="contact-form">
<input type="text" value="100" id="number" name="number" />
<input type="hidden" value="00" id="decimal" name="decimal" />
<input type="submit" name="submit-form" />
</form>
<script>
var form = document.getElementById('#contact-form');
form.addEventListener("submit", function() {
var input = document.createElement('number');
input.type = 'text';
input.name = 'decimal';
input.value = '00';
this.appendChild(input);
}, true);
</script>
// I want it to append the decimal '00' to the input number before submitting the form.
// I want the result as = 10000

form.addEventListener("submit", function() {
var decimal_val= document.getElementByName('decimal').value;
var number= document.getElementByName('number').value;
number = decimal_val+number;
}, true);

try this
<html>
<head></head>
<title></title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<body>
<form id="contact-form">
<input type="text" value="100" id="number" name="number" />
<input type="hidden" value="00" id="decimal" name="decimal" />
<input type="submit" name="submit-form" id="clickme" />
</form>
</body>
<script type="text/javascript">
$(document).ready(function(){
//in here ,first check the existing value with an alert when document is ready
var hiddenValue = $("#decimal").val();
alert("before value :" + hiddenValue);
//in this part you can assign the new value
$("#clickme").click(function(){
var newhiddenVal = "new decimal";
$("#decimal").val(newhiddenVal);
var displaynewHiddenvalue = $("#decimal").val();
alert(displaynewHiddenvalue);
});
});
</script>
</html>
note : to understand, first it shows the existing value, then in the button click , assign your new value , then display.(display with alsert, because then you can understand easily)
to assign the values in button click
var newhiddenVal = "new decimal";
$("#decimal").val(newhiddenVal);
do above in button click. hope this will help.
to get 10000 as the new value, in your button click
$("#clickme").click(function(){
var newhiddenVal = $("#number").val() +hiddenValue;
$("#decimal").val(newhiddenVal);
var displaynewHiddenvalue = $("#decimal").val();
alert(displaynewHiddenvalue);
});

Disable submit button until all form inputs have data

I'm trying to disable the submit button until all inputs have some data. Right now the button is disabled, but it stays disabled after all inputs are filled in. What am I doing wrong?
$(document).ready(function (){
validate();
$('input').on('keyup', validate);
});
function validate(){
if ($('input').val().length > 0) {
$("input[type=submit]").prop("disabled", false);
} else {
$("input[type=submit]").prop("disabled", true);
}
}

Here's a modification of your code that checks all the <input> fields, instead of just the first one.
$(document).ready(function() {
validate();
$('input').on('keyup', validate);
});
function validate() {
var inputsWithValues = 0;
// get all input fields except for type='submit'
var myInputs = $("input:not([type='submit'])");
myInputs.each(function(e) {
// if it has a value, increment the counter
if ($(this).val()) {
inputsWithValues += 1;
}
});
if (inputsWithValues == myInputs.length) {
$("input[type=submit]").prop("disabled", false);
} else {
$("input[type=submit]").prop("disabled", true);
}
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="text"><br>
<input type="text"><br>
<input type="text"><br>
<input type="submit" value="Join">

Vanilla JS Solution.
In question selected JavaScript tag.
HTML Form:
<form action="/signup">
<div>
<label for="username">User Name</label>
<input type="text" name="username" required/>
</div>
<div>
<label for="password">Password</label>
<input type="password" name="password" />
</div>
<div>
<label for="r_password">Retype Password</label>
<input type="password" name="r_password" />
</div>
<div>
<label for="email">Email</label>
<input type="text" name="email" />
</div>
<input type="submit" value="Signup" disabled="disabled" />
</form>
JavaScript:
var form = document.querySelector('form')
var inputs = document.querySelectorAll('input')
var required_inputs = document.querySelectorAll('input[required]')
var register = document.querySelector('input[type="submit"]')
form.addEventListener('keyup', function(e) {
var disabled = false
inputs.forEach(function(input, index) {
if (input.value === '' || !input.value.replace(/\s/g, '').length) {
disabled = true
}
})
if (disabled) {
register.setAttribute('disabled', 'disabled')
} else {
register.removeAttribute('disabled')
}
})
Some explanation:
In this code we add keyup event on html form and on every keypress check all input fields. If at least one input field we have are empty or contains only space characters then we assign the true value to disabled variable and disable submit button.
If you need to disable submit button until all required input fields are filled in - replace:
inputs.forEach(function(input, index) {
with:
required_inputs.forEach(function(input, index) {
where required_inputs is already declared array containing only required input fields.
JSFiddle Demo: https://jsfiddle.net/ydo7L3m7/

You could try using jQuery Validate
http://jqueryvalidation.org/
<script src="http://ajax.aspnetcdn.com/ajax/jquery.validate/1.9/jquery.validate.js"></script>
And then do something like the following:
$('#YourFormName').validate({
rules: {
InputName1: {
required: true
},
InputName2: { //etc..
required: true
}
}
});

Refer to the sample here.
In this only input of type="text" has been considered as described in your question.
HTML:
<div>
<form>
<div>
<label>
Name:
<input type="text" name="name">
</label>
</div>
<br>
<div>
<label>
Age:
<input type="text" name="age">
</label>
</div>
<br>
<div>
<input type="submit" value="Submit">
</div>
</form>
</div>
JS:
$(document).ready(function () {
validate();
$('input').on('keyup check', validate);
});
function validate() {
var input = $('input');
var isValid = false;
$.each(input, function (k, v) {
if (v.type != "submit") {
isValid = (k == 0) ?
v.value ? true : false : isValid && v.value ? true : false;
}
if (isValid) {
$("input[type=submit]").prop("disabled", false);
} else {
$("input[type=submit]").prop("disabled", true);
}
});
}

Try to modify your function like this :
function validate(){
if ($('input').val() != '') {
$("input[type=submit]").prop("disabled", false);
} else {
$("input[type=submit]").prop("disabled", true);
}
}
and place some event trigger or something like onkeyup in jquery.But for plain js, it looks like this :
<input type = "text" name = "test" id = "test" onkeyup = "validate();">
Not so sure of this but it might help.

Here is a dynamic code that check all inputs to have data when wants to submit it:
$("form").submit(function(e) {
var error = 0;
$('input').removeClass('error');
$('.require').each(function(index) {
if ($(this).val() == '' || $(this).val() == ' ') {
$(this).addClass('error');
error++;
}
});
if (error > 0) {
//Means if has error:
e.preventDefault();
return false;
} else {
return true;
}
});
.error {
border: 1px solid red;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
<form>
<form action="google.com">
<input type="text" placeholder="This is input #1" class="require" />
<input type="text" placeholder="This is input #2" class="require" />
<input type="submit" value="submit" />
</form>
</form>
Now you see there is a class called require, you just need to give this class to inputs that have to have value then this function will check if that input has value or not, and if those required inputs are empty Jquery will prevent to submit the form!

Modify your code
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js" type="text/javascript"></script>
<input type="text"><br>
<input type="text"><br>
<input type="text"><br>
<input type="submit" value="Join">
<script>
$(document).ready(function (){
validate();
$('input').on('keyup', validate);
});
function validate(){
$("input[type=text]").each(function(){
if($(this).val().length > 0)
{
$("input[type=submit]").prop("disabled", false);
}
else
{
$("input[type=submit]").prop("disabled", true);
}
});
}
</script>

function disabledBtn(_className,_btnName) {
var inputsWithValues = 0;
var _f = document.getElementsByClassName(_className);
for(var i=0; i < _f.length; i++) {
if (_f[i].value) {
inputsWithValues += 1;
}
}
if (inputsWithValues == _f.length) {
document.getElementsByName(_btnName)[0].disabled = false;
} else {
document.getElementsByName(_btnName)[0].disabled = true;
}
}
<input type="text" class="xxxxx" onKeyUp="disabledBtn('xxxxx','fruit')"><br>
<input type="text" class="xxxxx" onKeyUp="disabledBtn('xxxxx','fruit')"><br>
<input type="text" class="xxxxx" onKeyUp="disabledBtn('xxxxx','fruit')"><br>
<input type="submit" value="Join" id="yyyyy" disabled name="fruit">

Print out data attribute value with jquery

I get "undefined" print 3 times (the right amount of times). How can I get the data-bind value for the found inputs?
function DataBindForEdit(dataTag, controller, action) {
// get the inputs that will be sent to the controller
var dataBoundControls = $('[data-bind="' + dataTag + '"] [data-bind]');
// loop over each element
dataBoundControls.each(function () {
var self = $(this);
// for now just print out the value of the data-bind attribute
alert(self.data("data-bind"));
});
}
#section Scripts{
<script>
$(function () {
$("#btnSave").click(function(){
DataBindForEdit("Customer", "Index", "CreateCustomers");
});
});
</script>
}
<form data-bind="Customer">
Name: <input type="text" data-bind="Name" data-bind-type="text" />
Birthday: <input type="text" data-bind="Birthday" data-bind-type="text" />
Address: <input type="text" data-bind="Address" data-bind-type="text" />
<input type="submit" value="Save" id="btnSave" />
</form>

You should not include data-. It should be:
self.data("bind")

How to revert change made by DOM?

So I made a simple javascript form validator which creates a box with the error message using DOM. But I can't figure out a way how to reset all these changes when i reset the form using
<button type="reset">
I would like to know how it's done please.
Thanks.
The Code
<html>
<head>
<script type="text/javascript">
function validate(){
var fname = document.getElementById("fname");
var surname = document.getElementById("surname");
if(fname.value === "" || fname.value === null){
document.getElementById("sbody").style.display = "block";
document.getElementById("fname").style.display = "block";
return false;
}
//Verify Last Name
if(surname.value === "" || surname.value === null){
document.getElementById("sbody").style.display = "block";
document.getElementById("surname").style.display = "block";
return false;
}
}//End Validate Function
</script>
<style type="text/css">
#sbody{
width: 100px;
height: 100px;
background-color: #f3f3f3;
display:none;
}
.vis{
display: none;
font-size: 12px;
}
</style>
</head>
<body>
<section id="sbody">
<span id="fner" class="vis">First Name is missing.</span>
<span id="lner" class="vis">Surame is missing.</span>
</section>
<form id="registerForm" method="POST" action="register.php" onsubmit="return validate()">
<label for="fname" class="labelStyle">First Name: </label>
<input id="fname" name="fname" type="text" value="">
<label for="surname" class="labelStyle">Surname: </label>
<input id="surname" name="surname" type="text" value="">
<button type="submit">Sign Up</button>
<button type="reset">Reset</button>
</form>
</body>
</html>

The browser cannot magically figure out what has to be done to reset the custom changes.
However you can listen to the reset event of the form using element.addEventListener.
DEMO
HTML
<form id="test">
<div id="errors-ct">The form has errors</div>
<button type="reset">Reset</button>
</form>
JS
//wait for the DOM to be ready
document.addEventListener('DOMContentLoaded', function () {
//store a reference to the errors container div
var errorsCt = document.getElementById('errors-ct');
//listen to the reset event of the form
document.getElementById('test').addEventListener('reset', function (e) {
var form = e.target; //this is how you could access the form
//hide the errors container
errorsCt.style.display = 'none';
});
});

If you want to reset the form, as if user hadn't made any selections or added any input, then just set all form element values to their default value, or empty.
jsFiddle
<div>
<form action="/echo/html" method="get">
<input type="text" placeholder="username" />
<br/>
<input type="password" placeholder="password" />
<br/>
<input type="checkbox" value="test" data-default="checked" checked="checked"/>
<br/>
<button type="reset" value="reset" onclick="resetForm()">reset</button>
<br/>
</form>
<div id="err">Some error message</div>
</div>
window.resetForm = function () {
var fields = $('input'),
uname, pass, check;
uname = $(fields.get(0));
pass = $(fields.get(1));
check = $(fields.get(2));
$("#err").text("");
uname.val('');
pass.val('');
if (check.attr("data-default") == "checked") {
check.attr("checked", "checked");
} else {
check.removeAttr("checked");
}
}