Javascript dynamically created form field validation - javascript

I have created a form with a dynamically created field and i am trying to find a way to validate all the fields with javascript. I just want to alert the user that a field is null. Here is my code:
<script>
var counter = 0;
function addInput(divName){
counter++;
var Ai8ousa = document.createElement('div');
Ai8ousa.innerHTML = "Field: "+(counter +1) + "<input type='text' name='field[]'>";
document.getElementById(divName).appendChild(Ai8ousa);
}
function validations(form){
var field;
var i=0;
do{
field=form['field[]'];
if (field.value=='')
{
alert('The field is null!!!');
return false;
}
i++;
}while(i<counter);
}
</script>
<form action="" method="post" onsubmit="return validations(this)" >
<div id="dynamicInput">
Field : <input type="text" name="field[]" /> <br />
</div>
<input type="button" value="New field" onClick="addInput('dynamicInput');">
<input type="submit" value="Submit" />
</form>
I was expecting that will work but i was obviously wrong:(
With this code if i haven't pressed the "New field" button and press submit i will get the alert as expected. But on all other cases i am not getting anything!
Thanks for your time anyway, and sorry if i have made grammar mistakes!

<script type="text/javascript">
var counter = 0;
function addInput(divName){
counter++;
var Ai8ousa = document.createElement('div');
Ai8ousa.innerHTML = "Field: "+(counter +1) + "<input type='text' name='field[]'>";
document.getElementById(divName).appendChild(Ai8ousa);
}
function validations(form){
var field;
var i=0;
do{
field=form[i];
if (field.value=='')
{
alert('The field is null!!!');
return false;
}
i++;
}while(i<counter);
}
</script>
<form action="" method="post" onsubmit="return validations(this)" >
<div id="dynamicInput">
Field : <input type="text" name="field[]" /> <br />
</div>
<input type="button" value="New field" onClick="addInput('dynamicInput');">
<input type="submit" value="Submit" />
</form>
I don't understand this line: field=form['field[]'];, so I changed it to field=form[i];
http://jsfiddle.net/sZ4sd/

Related

Using JavaScript to check for user-input

I'm submitting a form with input text to my server through my web client. What I'm trying to do is to check whether the user has passed in text into the input field before sending the form by hitting the submit button.
What I have tried so far:
var form = document.getElementById("id");
document.getElementById("id").addEventListener("click", function() {
var input = document.getElementById("content").value;
if (input == "") {
alert("write something in the textfield");
} else {
form.submit();
}
});
<form action="" method="post" id="id">
<input type="text" name="name" id="content">
<button type="submit" id="submit-id">submit text</button>
</form>
Any good tips on how to do this?
You want preventDefault on the submit event
document.getElementById("id").addEventListener("submit", function(e) {
const input = document.getElementById("content").value;
if (input.trim() === "") {
alert("write something in the textfield");
e.preventDefault()
}
});
<form action="" method="post" id="id">
<input type="text" name="name" id="content">
<button type="submit" id="submit-id">submit text</button>
</form>
Alternatively just add required attribute - no need for script:
<form action="" method="post" id="id">
<input type="text" name="name" id="content" required>
<button type="submit" id="submit-id">submit text</button>
</form>
you can use the simple code snippet instead :
<form action="" method="post" id="id">
<input type="text" name="name" id="content" required>
<button type="submit" id="submit-id">submit text</button>
</form>
function submitIt(e) {
var formData = new FormData(e);
var object = {};
formData.forEach(function(value, key) {
object[key] = value;
});
if (object.name == "") {
alert("null");
} else {
alert("ok");
return true;
}
return false;
}
<form onsubmit="return submitIt(this)">
<input type="text" name="name">
<button>submit text</button>
</form>

How to create a password which will reveal a hidden message in html and js

I'm new to HTML and js, and I am currently trying to make it so that the user will type in a password, and if correct, it will reveal a hidden message. This is what I got so far. I can't get it to work.
Here's the HTML:
<form id="form" onsubmit="return false;">
<input type="text" id="userInput" />
<input type="submit" onclick="othername();" />
</form>
<p id="hidden_clue"></p>
And here's the js:
var pass1 = 3736.62417618;
var input = document.getElementById("userInput").value;
alert(input);
if (input == pass1) {
document.getElementById("demo").innerHTML = "Hello JavaScript!";
}
You were close, but on the getElementById you need to select the ID of the element that you want to get.
function othername() {
var pass1 = 3736.62417618;
var input = document.getElementById("userInput").value;
if (input == pass1) {
document.getElementById("hidden_clue").textContent = "Hello JavaScript!";
}
}
<form id="form" onsubmit="return false;">
<input type="password" id="userInput" />
<input type="submit" onclick="othername();" />
</form>
<p id="hidden_clue"></p>

How to get values of multiple textboxes generated dynamically?

I have a button called 'AddTextArea', on clicking, I get new text area, but how can I get the values that I have entered in the new text areas?
I tried like this-
var x= document.getElementById("div_quotes").value;
but it's not working.
Please help, as I am new to JS, thanks in advance.
<html>
<head>
<script type="text/javascript">
function addTextArea(){
var div = document.getElementById('div_quotes');
div.innerHTML += "<textarea name='new_quote[]' />";
div.innerHTML += "\n<br />";
}
</script>
</head>
<body>
<form method="post">
<!--<input type="text" name="text_new_author" /><br />-->
<div id="div_quotes"></div>
<input type="button" value="Add Text Area" onClick="addTextArea();">
<input type="submit" name="submitted">
</form>
</body>
</html>
var x= document.getElementById("div_quotes").value;
Above code will not work as div_quotes is a div and div do not have value property.
You will have to search for textareas in this div.
Sample
function addTextArea() {
var div = document.getElementById('div_quotes');
div.innerHTML += "<textarea name='new_quote[]' />";
div.innerHTML += "\n<br />";
}
function validate(){
var tas = document.querySelectorAll('#div_quotes textarea[name="new_quote[]"]')
for(var i = 0; i< tas.length; i++){
console.log(tas[i].value)
}
}
<form method="post">
<!--<input type="text" name="text_new_author" /><br />-->
<div id="div_quotes"></div>
<input type="button" value="Add Text Area" onClick="addTextArea();">
<input type="button" name="submitted" onclick="validate()" value="Validate">
</form>
Version 2
Now if you notice in above sample, if you type and then add another textarea, it will flush value of previous ones. This is because, you are setting .innerHTML += .... This will destroy and recreate all elements again. You should use document.createElement
function addTextArea() {
var div = document.getElementById('div_quotes');
var wrapper = document.createElement('div')
var ta = document.createElement('textarea');
ta.name = "new_quote[]"
wrapper.append(ta);
div.append(wrapper)
}
function validate(){
var tas = document.querySelectorAll('#div_quotes textarea[name="new_quote[]"]')
for(var i = 0; i< tas.length; i++){
console.log(tas[i].value)
}
}
<form method="post">
<!--<input type="text" name="text_new_author" /><br />-->
<div id="div_quotes"></div>
<input type="button" value="Add Text Area" onClick="addTextArea();">
<input type="button" name="submitted" onclick="validate()" value="Validate">
</form>
You can add a CSS Class to the new text area that is generated and get the data using
var x = document.getElementsByClassName("dynamicTxtArea")
I have added the class to the Text area that is being dynamically generated. Please check the code below.
<html>
<head>
<script type="text/javascript">
function addTextArea(){
div.innerHTML += "<textarea name='new_quote[]' class='dynamicTxtArea'/>";
div.innerHTML += "\n<br />";
}
</script>
</head>
<body>
<form method="post">
<!--<input type="text" name="text_new_author" /><br />-->
<div id="div_quotes"></div>
<input type="button" value="Add Text Area" onClick="addTextArea();">
<input type="submit" name="submitted">
</form>
</body>
</html>

PHP code not working in a Form which is used for javascript

I am working with a form which uses Javascript for a process. When i try to read the textbox value in form with PHP, It's not showing output.
My code is
HTMLCode is
<form class="form-inline" method="POST" action="staff.php" onSubmit=" return questiontable()" >
<div class="form-group">
<label for="qscount">Number of Questions: </label>
<input type="number" name="qscount" class="form-control" id="qscount" style="width:150px;" placeholder="No of questions"> <br>
</div>
<div class="form-group">
<button type="submit" class="btn btn-primary" id="gobtn" onClick="return disable()" >Go</button> <br>
<p id="btnhide"> </p>
</div>
</form>
Javascript is
<script type="text/javascript">
function questiontable()
{
var qs = document.getElementById("qscount").value;
var count;
for(count=1; count<=qs; count++)
{
document.getElementById("demo").innerHTML += '<br><font style="font-size: 20px">'+ count+'. <input class="textboxtest" style="width:850px;" type="text" name=" q'+ count +' " placeholder="Question "><br>' ;
document.getElementById("demo").innerHTML +='<br><input style="margin-left: 25px;" type="radio" name="a'+count+'" value="c1"> <input class="testbox" type="text" name="o'+count+'1" placeholder="Option 1">';
return false;
}
</script>
PHP Code is
<?php
if (isset($_POST['qscount'])){
echo $_POST['qscount'];
}
?>
I want to use this qscount value in another php page. How to get this textbox value in PHP and use it in another page ?
Javascript function() should return true, since you are using return function() in onclick attribute of button type=submit
<script type="text/javascript">
function questiontable()
{
var qs = document.getElementById("qscount").value;
var count;
for(count=1; count<=qs; count++)
{
document.getElementById("demo").innerHTML += '<br><font style="font-size: 20px">'+ count+'. <input class="textboxtest" style="width:850px;" type="text" name=" q'+ count +' " placeholder="Question "><br>' ;
document.getElementById("demo").innerHTML +='<br><input style="margin-left: 25px;" type="radio" name="a'+count+'" value="c1"> <input class="testbox" type="text" name="o'+count+'1" placeholder="Option 1">';
}
return true;
}
</script>
This will continue the form posting onclick of the button
If you are trying to create the number of questions on click dynamically using javascript,
then use syntax to call questionTable
<button type="button" class="btn btn-primary" id="gobtn" onClick="javascript:return questiontable()" >Create Questions</button>
Remove
onSubmit=" return questiontable()"
from the form
Now when the question table is rendered, please show the button type="submit"
<button type=submit value="Go" name="cmdGo">Go</button>
to trigger form submission
Hope it helps!

Loading Values into auto generated HTML input elements using javascript

I am using a javascript function to populate html element generated automatically after submitting a form from a different div.
Here is the html:
<html >
<body>
<div class="wrapper">
<div id="one">
<form name="form">
<fieldset>
<legend>BILLING</legend>
<div> <label for="ex1">Procedure/Drug</label>
<input type="text" name="procdrug" id="procdrug"/><br><br>
<label>Amount</label>
<input type="text" name="amount" id="amount"/><br><br>
<input type="button" onclick="addInput()" name="add" value="Add input field" style="margin-left:150px" />
</div>
</fieldset>
</form>
</div>
<div id="two">
<fieldset>
<legend>TN QUEUE</legend>
<label><B>Procedure/Drug</b></label><label><b>Amount</b></label><br>
<div id="text">
</div>
<label><b>Total</b></label>
<input type="text" name="total" id="total"/>
</fieldset>
</div>
</body>
</html>
Here is the javascript function
<script language="javascript">
fields = 0;
function addInput() {
var amount=document.getElementById('amount').value;
var pd=document.getElementById('procdrug').value;
if (fields != 10)
{
document.getElementById('text').innerHTML += "<input id='pdgen' type='text'/>";
document.getElementById('text').innerHTML += "<input id='amtgen' type='text'/><br />";
document.getElementById('pdgen').value=pd;
document.getElementById('amtgen').value=amount;
fields += 1;
}
else
{
document.getElementById('text').innerHTML += "<br />Only A Maximum of 10 is allowed.";
document.form.add.disabled=true;
}
}
</script>
The generated elements values are posted from the form and increment on every submit. My problem is the only on submit first element is updated with the new value:
Sample results
Procedure/Drug Amount
Amoxyl 200
blank element blank element
blank element blank element
blank element blank element
Total
The problem is you are adding your elements with the .innerHtml += method which is avoiding the values entered before. You need to use appendChild method to add new elements. Here is your new code :
fields = 0;
function addInput() {
var amount=document.getElementById('amount').value;
var pd=document.getElementById('procdrug').value;
var br = document.createElement('br');
if (fields != 10)
{
var input1 = document.createElement('input');
input1.setAttribute('id','pdgen' + fields);
input1.value = pd;
var input2 = document.createElement('input');
input2.setAttribute('id','amtgen' + fields);
input2.value = amount;
document.getElementById('text').appendChild(input1);
document.getElementById('text').appendChild(input2);
document.getElementById('text').appendChild(br);
fields++;
}
else
{
document.getElementById('text').innerHTML += "<br />Only A Maximum of 10 is allowed.";
document.form.add.disabled=true;
}
}
FIDDLE

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