My javascript stops working after ajax response - javascript

For some reason my javascript stops working after I have submitted a POST request.
Here is what is happening. I load my webpage, fill out the form and click 'Click me' :
Next I click ok in the alert popup and the expected result appears:
I fill out the form, but when I try to click the button nothing happens!
Not even my alert popup.
Here are the files I am using.
My CSS, simple2.css :
body, html {
margin:0;
padding;
height:100%
}
a {
font-size:1.25em;
}
#content {
padding:25px;
}
#fade {
display: none;
position:absolute;
top: 0%;
left: 0%;
width: 100%;
height: 100%;
background-color: #ababab;
z-index: 1001;
-moz-opacity: 0.8;
opacity: .70;
filter: alpha(opacity=80);
}
#modal {
display: none;
position: absolute;
top: 45%;
left: 45%;
width: 64px;
height: 64px;
padding:30px 15px 0px;
border: 3px solid #ababab;
box-shadow:1px 1px 10px #ababab;
border-radius:20px;
background-color: white;
z-index: 1002;
text-align:center;
overflow: auto;
}
#results {
font-size:1.25em;
color:red
}
My HTML, simple2.html :
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<link rel="stylesheet" type="text/css" href="simple2.css">
<title>simple II</title>
</head>
<body>
<div id="fade"></div>
<div id="modal"> <img id="loader" src="images/loading.gif" /> </div>
<div id="results"><!-- Results are displayed here -->
<form method="post" name="start" target="_blank">
<p>Enter thing1: <input type="text" id="thing1" name="thing1" size="10" /></p>
<p>Enter thing2: <input type="text" id="thing2" name="thing2" size="10" /></p>
<p>Enter thing3: <input type="text" id="thing3" name="thing3" size="10" /></p>
<p>Check thing4: <input type="checkbox" id="thing4" name="thing4" value=1>
<input type="hidden" id="state" name="state" value="one" /></p>
</form>
<button id='clickme' name='clickme'>Click me</button>
<script src="simple2.js?0000000000015"></script>
</div>
</body>
</html>
My javascript, simple2.js :
function openModal() {
document.getElementById('modal').style.display = 'block';
document.getElementById('fade').style.display = 'block';
}
function closeModal() {
document.getElementById('modal').style.display = 'none';
document.getElementById('fade').style.display = 'none';
}
function loadAjax(url,data, app, epoch, state) {
console.log ("loadAjax urls is [" + url + "] data is [" + data + "]" );
// document.getElementById('results').innerHTML = '';
console.log ("line 14");
openModal();
console.log ("line 16");
var xhr = false;
console.log ("line 18");
if (window.XMLHttpRequest) {
xhr = new XMLHttpRequest();
} else {
xhr = new ActiveXObject("Microsoft.XMLHTTP");
}
if (xhr) {
xhr.onreadystatechange = function () {
if (xhr.readyState == 4 && xhr.status == 200) {
closeModal();
console.log ("line 28");
document.getElementById("results").innerHTML = xhr.responseText;
}
}
console.log ("line 32");
xhr.open("POST", url, true);
xhr.setRequestHeader("Content-type","application/x-www-form-urlencoded");
xhr.send(data);
console.log ("line 35");
}
}
document.querySelector("#results button").addEventListener("click", function(e) {
e.preventDefault();
var inputs = document.querySelectorAll("input");
var params = inputs[0].name + "=" + inputs[0].value;
for( var i = 1; i < inputs.length; i++ ) {
var input = inputs[i];
var name = input.name;
var value = input.value;
params += "&" + name + "=" + value;
}
alert( params );
loadAjax( "/cgi-bin/simple2.py", encodeURI(params));
});
... and finally my cgi script, simple2.py :
#!/usr/bin/env python
import cgi
import os
#import cgitb
import cgitb; cgitb.enable() # for troubleshooting
import time
import calendar
def goto_state_two( a, b, c, d ):
print """
Thank you!<br>
<li>thing1 is [%s]
<li>thing2 is [%s]
<li>thing3 is [%s]
<li>thing4 is [%s]
<hr>
<form method="post" name="start" target="_blank">
<p>Enter thing5: <input type="text" id="thing5" name="thing5" size="10" /></p>
<p>Enter thing6: <input type="text" id="thing6" name="thing6" size="10" /></p>
<p>Enter thing7: <input type="text" id="thing7" name="thing7" size="10" /></p>
<p>Check thing8: <input type="checkbox" id="thing8" name="thing8" value=1>
<input type="hidden" id="state" name="state" value="two" /></p>
</form>
<button id='clickme' name='clickme'>Click me</button>
<script src="simple2.js?%d"></script>
""" % (a,b,c,d,calendar.timegm(time.gmtime()))
def goto_done( a, b, c, d ):
print """
Thank you!<br>
<li>thing1 is [%s]
<li>thing2 is [%s]
<li>thing3 is [%s]
<li>thing4 is [%s]
<hr>
<form method="post" name="start" target="_blank">
<input type="hidden" id="state" name="state" value="done" /></p>
</form>
<button id='clickme' name='clickme'>Click me</button>
<script src="simple2.js?%d"></script>
""" % (a,b,c,d,calendar.timegm(time.gmtime()))
form = cgi.FieldStorage()
state = form.getvalue("state")
if state == 'one' :
thing1 = form.getvalue("thing1", "")
thing2 = form.getvalue("thing2", "")
thing3 = form.getvalue("thing3", "")
thing4 = form.getvalue("thing4", "")
goto_state_two( thing1, thing2, thing3, thing4 )
elif state == 'two' :
thing5 = form.getvalue("thing5", "")
thing6 = form.getvalue("thing6", "")
thing7 = form.getvalue("thing7", "")
thing8 = form.getvalue("thing8", "")
goto_done( thing5, thing6, thing7, thing8 )
elif state == 'done' :
print """
Hurray you did it!<br>
"""
else:
print """
unknown state [%s]
<hr>
""" % ( state )

document.getElementById("results").addEventListener("click", function(e) {
if(e.target && e.target.nodeName == "BUTTON") {
// Move Prevent Default into condition to allow
// other events to bubble.
e.preventDefault();
// This is a Button click we have captured
var inputs = document.querySelectorAll("input");
var params = inputs[0].name + "=" + inputs[0].value;
for( var i = 1; i < inputs.length; i++ ) {
var input = inputs[i];
var name = input.name;
var value = input.value;
params += "&" + name + "=" + value;
}
alert( params );
loadAjax( "/cgi-bin/simple2.py", encodeURI(params));
}
});

Related

Use JS to determine if all form fields are filled and correctly

*Edit: Fixed so that all inputs are now validated on one form. However, I can only add one variable to check if blank, as soon as I add more, none of the submit functions work. I have been trying multiple things.
function validateForm() {
var inputVelocity = document.getElementById("dzCalculator").inputVelocity.value;
var inputYellowPhase = document.getElementById("dzCalculator").inputYellowPhase.value;
var inputRedPhase = document.getElementById("dzCalculator").inputInterPhase.value;
var inputReactionTime = document.getElementById("dzCalculator").inputReactionTime.value;
if(inputVelocity === "" && inputYellowPhase === "" && inputRedPhase === "" && inputReactionTime === ""){
alert("Input all fields to calculate.");
return false;
}
}
I have checked the HTML matches - it does. But I found I could not use onsubmit="return validateForm" as this wouldn't work at all.
This is only 4 of the form values, there are seven all up. But when I can get the four working, I can get them all working.
How can I use JS to make sure that no input is left blank or empty? I already have made it so that it will only accept numbers and decimal points. So no one can add an incorrect field. But currently, they can leave a field blank which means my calculator generates a NaN response.
Also, how can I make sure one of my fields can not accept a number greater than 1 or less than 0. I tried min="0" max="1" in the input tag, but because I have removed spinners, this doesn't work.
So, in summary, I am looking to make sure when a button is clicked that all the form sections are filled in and that one of the fields doesn't accept a number greater that 1 or less than zero.
there are 2 options for this.
You can select all the inputs (inside the form tag) using querySelector and check the value of each input by looping through them.
use this trick selector to get all the invalid inputs
document.querySelectorAll('input:not([value]):not([value=""])');
replace input with more precise selector.
Can you please give more detail about how your form is in multiple places?
For input I think you need to use step attribute
https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input/number#step
Reference: javascript_form_validation
Depends when would you like to validate form fields
For example: Form validation on submit
function validateForm() {
var x = document.forms["myForm"]["fname"].value;
if (x == "") {
alert("Name must be filled out");
return false;
}
}
<html>
<body>
<form name="myForm" action="/action_page.php" onsubmit="return validateForm()" method="post">
Name: <input type="text" name="fname">
<input type="submit" value="Submit">
</form>
</body>
</html>
Give name to your form using name attribute such as <form name="myForm" ..>
Then using document.forms["myForm"] you can have access to your form
There you can validate your input fields value. return true if validates
This works for me. You can use it, style it however you want or not. You do need JQuery. It has powerful selectors.
<!DOCTYPE html>
<html lang="en">
<head>
<style type="text/css">
body{
font-size: 12px;
}
.main-container{
display: flex; /* DO NOT CHANGE */
height: 100vh; /* DO NOT CHANGE */
width: 100%; /* DO NOT CHANGE */
}
.c-message{
display: flex; /* DO NOT CHANGE */
position: fixed; /* DO NOT CHANGE */
top: 0px; /* DO NOT CHANGE */
left: 0px; /* DO NOT CHANGE */
width: 100%; /* DO NOT CHANGE */
height: 100%; /* DO NOT CHANGE */
}
.c-msgbox{
padding: 30px;
text-align: center;
margin: auto; /* DO NOT CHANGE */
background-color: #e4e4e4;
border-radius: 4px;
border: 1px solid #adadad;
-webkit-box-shadow: 0px 0px 50px rgba(0, 0, 0, 0.60);
-moz-box-shadow: 0px 0px 50px rgba(0, 0, 0, 0.60);
box-shadow: 0px 0px 20px rgba(0, 0, 0, 0.40);
}
.standerd-button2{
border: none;
font-family: arial,helvetica,clean,sans-serif;
font-size: 10px;
font-weight: 600;
color: white;
background: #1A709F;
padding: 3px;
text-align: center;
vertical-align: middle;
-webkit-border-radius: 3px;
width: max-content;
min-width: 50px;
margin: 2px;
}
.standerd-button2:hover{
background: crimson;
cursor: default;
}
.f-table {
display: table;
width: max-content;
padding: 5px;
border-spacing: 2px;
}
.f-tablerow {
display: table-row;
}
.f-tablecell{
display: table-cell;
}
.label-cell-r{
text-align: right;
}
.dd-required{
margin: auto;
color: red;
}
input, select{
border: 1px solid lightgrey;
}
</style>
<script type="text/javascript" src="JQuery.js"></script>
</head>
<body>
<div class="main-container">
<div>
<form id="f1" name="f1">
<div class="f-table">
<div class="f-tablerow">
<div class="f-tablecell label-cell-r">
<label for="firstname">First Name</label>
</div>
<div class="f-tablecell input-cell">
<input id="firstname" name="firstname" type="text" data-er="First Name"/>
<span class='dd-required'>*</span>
</div>
</div>
<div class="f-tablerow">
<div class="f-tablecell label-cell-r">
<label for="lastname">Last Name</label>
</div>
<div class="f-tablecell input-cell">
<input id="lastname" name="lastname" type="text" data-er="Last Name"/>
<span class='dd-required'>*</span>
</div>
</div>
<div class="f-tablerow">
<div class="f-tablecell label-cell-r">
<label for="company">Company</label>
</div>
<div class="f-tablecell input-cell">
<select id="company" name="company" data-er="Company Name">
<option value="0"> - Select Comapny - </option>
<option value="1">Company 1</option>
<option value="2">Company 2</option>
<option value="3">Company 3</option>
<option value="4">Company 4</option>
</select>
<span class='dd-required'>*</span>
</div>
</div>
</div>
<input id="b1" type="submit" value="Submit" />
</form>
</div>
<div>
<script type="text/javascript">
$.fn.CustomAlert = function (options, callback) {
var settings = $.extend({
message: null,
detail: null,
yesno: false,
okaytext: null,
yestext: null,
notext: null
}, options);
var frm = "";
detail = "<b>" + settings.detail + "</b>";
message = "<b>" + settings.message + "</b>";
if (settings.detail === null) {
detail = "";
};
frm = frm + message + "<div style='text-align: left; margin-top: 15px; margin-bottom: 15px;'>" + detail + "</div>";
if (settings.yesno === false) {
frm = frm + "<input id='ok' type='button' value='" + settings.okaytext + "' class='standerd-button2' />";
} else {
frm = frm + "<div><input id='yes' type='button' value='" + settings.yestext + "' name='yes' class='standerd-button2' />" +
"<input id='no' type='button' value='" + settings.notext + "' name='no' class='standerd-button2' /></div>";
};
var frmesg = "<div id='cmessage' name='cmessage' class='c-message'>" +
"<div class='c-msgbox'>" +
"<form>" + frm + "</form>" +
"</div>" +
"</div>";
$(".main-container").append(frmesg);
if (!settings.yesno) {
$("#cmessage #ok").click(function () {
$("#cmessage").remove();
callback(false);
});
} else {
$("#cmessage #yes").click(function () {
$("#cmessage").remove();
callback(true);
});
$("#cmessage #no").click(function () {
$("#cmessage").remove();
callback(false);
});
};
};
$.fn.JsFormCheck = function () {
var MessData = "";
this.find('select, input').each(function () {
if ($(this).attr("data-er")) {
m = $(this).attr("data-er");
switch ($(this).get(0).tagName) {
case "INPUT":
if ($(this).val().length === 0) {
MessData = MessData + "- " + m + "<br>";
$(this).css('border-bottom', '2px solid green');
};
break;
case "SELECT":
if ($(this).val() === "0") {
MessData = MessData + "- " + m + "<br>";
$(this).css('border-bottom', '2px solid green');
};
break;
};
};
});
if (MessData.length > 0) {
MessData = "<b>" + MessData + "</b>";
x = $().CustomAlert({message: "<b>Please fill in the following required fields to continue.</b>",
detail: MessData,
okaytext: "Close",
yesno: false});
return true;
} else {
return false;
};
};
$('#f1 #b1').click(function(event){
event.preventDefault();
Error = $("#f1").JsFormCheck();
if(Error === false){
null;
//Do Something
};
});
</script>
</body>

Unable to redirect my form to a new html page. Its going to localhost:3000/confirm.html instead i want it to open confirm.html in a new window

In the below code, after clicking on 'Save Data' I want the page to go to another htm page 'confrim.html'. Instead what is happening is its just showing "localhost:3000/confirm.html" and not opening a new page. Can anyone help to fix this, attaching the code for the reference.
I tried to implement the following through the submitInfo() function
Thanks
<!DOCTYPE html>
<html>
<head>
<!--<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css" integrity="sha384-Vkoo8x4CGsO3+Hhxv8T/Q5PaXtkKtu6ug5TOeNV6gBiFeWPGFN9MuhOf23Q9Ifjh" crossorigin="anonymous">-->
<style>
* {
box-sizing:border-box;
border-color: teal;
}
html{
background : radial-gradient(rgba(48, 97, 97, 0.5),rgba(255,255,255,0.5))
}
div {
padding: 10px;
overflow: hidden;
color: rgb(16, 8, 32);
font-size: 25px;
font-style: initial;
font-family: 'Times New Roman', Times, serif;
}
.input[type=button]{
font: 25px Calibri;
width: auto;
float: left;
cursor: pointer;
padding: 7px;
color: teal;
font-size: 30px;
}
#bt{
width : 190px;
height: 60px;
font-size: 25px;
font-family: 'Times New Roman', Times, serif;
background-color: #05193d;
color: whitesmoke;
box-shadow: 0 2px 2px 0 rgba(0,0,0,0.5);
margin-top: 10px;
}
input[type=text], textarea, select {
font: 17px Calibri;
width: 100%;
padding: 12px;
border: 1px solid rgb(19, 18, 18);
border-radius: 4px;
color:teal
}
</style>
<title>Save form Data in a Text File using JavaScript</title>
<h1>User Information </h1>
<!--<link rel="stylesheet" href="style.css">-->
</head>
<body>
<div>
<form name="myForm" action="confirm.html" method="POST" >
<!--Add few elements to the form-->
<div>
<label for="Name">Name</label>
<input type="text" id="txtName" placeholder="Enter your name" required />
</div>
<div>
<label for="Email">Email</label>
<input type="text" id="txtEmail" placeholder="Enter your Email Id" />
</div>
<div>
<label for="Controller Type">Controller Type</label>
<select id="selProd">
<option value=""> - Select the Controller - </option>
<option value="RAID">RAID</option>
<option value="JBOD">JBOD</option>
<option value="EBOD">EBOD</option>
<option value="AP">AP</option>
</select>
</div>
<div>
<label for="Test Type">Test Type </label>
<select id="selTest">
<option value=""> - Select The Test - </option>
<option value="BFT">BFT</option>
<option value="Manufacturing">Manufacturing</option>
<option value="Channel">Channel</option>
<option value="DVT" >DVT</option>
</select>
</div>
<div>
<label for="Protocol Type">Protocol Type </label>
<select id="selProto">
<option value=""> - Select The Protocol - </option>
<option value="SAS">SAS</option>
<option value="iSCSI">iSCSI</option>
<option value="FC">FC</option>
</select>
</div>
<div>
<label for="IP Address">IP Address:</label>
<input type="text" id="txtIP" placeholder="Enter your IP address" />
</div>
<div>
<label for="Chasis Input">Number of Chasis Input:</label>
<input type="number" id="txtInputs" placeholder="Enter Number of Chasis" />
</div>
<div>
<input type="button" id="myBtn" value="Save data" onclick="submitInfo()"/>
</div>
<div>
<input type="button" id="bt" value="Save data to file" onclick="saveFile()" />
</div>
</form>
</div>
<script>
let saveFile = () => {
// Get the data from each element on the form.
const name = document.getElementById('txtName');
const email = document.getElementById('txtEmail');
const test = document.getElementById('selTest');
const product = document.getElementById('selProd');
const protocol = document.getElementById('selProto');
const IP = document.getElementById('txtIP');
const Inputs = document.getElementById('txtInputs');
// This variable stores all the data.
let data =
'\rName : ' + name.value + '\r\n' +
'Email ID : ' + email.value + '\r\n' +
'Test Type : ' + test.value + '\r\n' +
'Product Type : ' + product.value + '\r\n' +
'Protocol Type : ' + protocol.value + '\r\n' +
'IP Address : ' + IP.value + '\r\n' +
'Chasis Inputs : ' + Inputs.value;
if(name.value =='' || email.value == '' || test.value =='' || product.value =='' || IP.value == ''|| Inputs.value == ''){
alert("Please fill all the fields!");
return;
}
const reg = /^([A-Za-z0-9_\-\.])+\#([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
if (reg.test(email.value) == false)
{
alert('Invalid Email Address');
return false;
}
var ipformat = /^(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$/;
if (ipformat.test(IP.value) == false)
{
alert('Invalid IP Address');
return false;
}
if(name.value.length<3){
alert("Name must be having atleast 3 Characters");
return;
}
if(name.value == ''){
alert("Enter the name First");
}
// Convert the text to BLOB.
const textToBLOB = new Blob([data], { type: 'text/plain' });
const sFileName = 'formData.yaml'; // The file to save the data.
let newLink = document.createElement("a");
newLink.download = sFileName;
if (window.webkitURL != null) {
newLink.href = window.webkitURL.createObjectURL(textToBLOB);
}
else {
newLink.href = window.URL.createObjectURL(textToBLOB);
newLink.style.display = "none";
document.body.appendChild(newLink);
}
newLink.click();
}
var disable_options = false;
document.getElementById('selProd').onchange = function () {
//alert("selected value = "+this.value);
if(this.value == "RAID")
{
document.getElementById('selProto').removeAttribute('disabled');
}
else
{
document.getElementById('selProto').setAttribute('disabled', true);
}
}
function submitInfo(){
var test = document.getElementById('selTest').value;
var product = document.getElementById('selProd').value;
if(product == "EBOD" && test== "BFT"){
window.location ="confirm.html";
}
}
</script>
</body>
</html>
You could use the window.open method - like so:
function submitInfo(){
var test = document.getElementById('selTest').value;
var product = document.getElementById('selProd').value;
if( product == "EBOD" && test== "BFT" ){
window.open( "confirm.html", "Confirm", "fullscreen=yes,location=no,menubar=yes,resizable=no,scrollbars=no,status=no,toolbar=no" );
}
}
you have a
<form name="myForm" action="confirm.html" method="POST" >
which, on form submit, your browser will look for confirm.html file. I don't know whether you have file named confirm.html, but I think you do. otherwise it'll show 404 error.
As you instructed in your form, browser'll look for confirm.html, and on redirect, it'll show what's in confirm.html file.
you should remove your js script from this file and put it inside confirm.html file. or just replace action="confirm.html" with action=""

event handler, broken page

The page should output and execute a temperature converter...
However,
While I'm wanting to test my program, I keep running into this a blank page type error...
can someone kind of proof read this, because I don't know what I'm missing.
"use strict";
var $ = function(id) { return document.getElementById(id); };
var convertTemp = function(){
var f;
var c;
if($("to_Celsius").checked){
f = parseFloat($("degrees_entered").value);
if(isNaN(f)){
alert("please type in a value ");
}
else{
c = (f-32) * 5/9;
$("degrees_computed").value = c.toFixed(0);
}
}
else{
c = parseFloat($("degrees_entered").value);
if(isNaN(c)){
alert("you must enter a valid number for degrees.");
}
else{
f = c * 9/5 + 32;
$("degrees_computed").value = f.toFixed(0);
}
}
};
var toFahrenheit = function(){
$("degree_label_1").firstChild.nodeValue = "Enter C degrees:";
$("degree_label_2").firstChild.nodeValue = "Degrees F";
clearTextBoxes();
$("degrees_entered").focus();
};
var toCelsius = function(){
$("degree_label_1").firstChild.nodeValue = "Enter F degrees: ";
$("degree_label_2").firstChild.nodeValue = "Degrees C: ";
clearTextBoxes();
$("degrees_entered").focus();
};
var clearTextBoxes = function(){
$("degrees_entered").value = "";
$("degrees_computed").value = "";
};
window.onload = function(){
$("convert").onclick = convertTemp;
$("to_Celsius").onclick != toCelsius;
$("to_Fahrenheit").onclick = toFahrenheit;
$("degrees_entered").focus();
};
body {
font-family: Arial, Helvetica, sans-serif;
background-color: white;
margin: 0 auto;
width: 450px;
border: 3px solid blue;
}
h1 {
color: blue;
margin: 0 0 .5em;
}
main {
padding: 1em 2em;
}
label {
float: left;
width: 10em;
margin-right: 1em;
}
input {
margin-bottom: .5em;
}
#convert {
width: 10em;
}
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Convert Temperatures</title>
<link rel="stylesheet" href="styles.css">
<script src="convert_temp.js"></script>
</head>
<body>
<main>
<h1>Convert temperatures</h1>
<input type="radio" name="conversion_type" id="to_celsius" checked>Fahrenheit to Celsius<br>
<input type="radio" name="conversion_type" id="to_fahrenheit">Celsius to Fahrenheit<br><br>
<label id="degree_label_1">Enter F degrees:</label>
<input type="text" id="degrees_entered" ><br>
<label id="degree_label_2">Degrees Celsius:</label>
<input type="text" id="degrees_computed" disabled><br>
<label> </label>
<input type="button" id="convert" value="Convert" /><br>
</main>
</body>
</html>
toCelcius != toCelsius ?
Is that it? A silly typo? The rest looks fine... also watch casing. In your JS you have to_Celsius... but in the html... to_celcius... bad habit for sure
Some issues I verified:
in the line if($("to_Celsius").checked){ you refer to to_Celsius id, but it should be to_celsius (lowercase);
in the lines:
$("to_Celsius").onclick = toCelsius;
$("to_Fahrenheit").onclick = toFahrenheit;
Same thing. Replace both the id with to_celsius and to_fahrenheit.
in this line var toCelcius = function(){, the function is named toCelcius. Just rename it to toCelsius (with s).
Working code: https://jsfiddle.net/mrlew/p8w111ms/

Better way to add and remove fields dynamically?

I made a way to add and remove fields using the input[type"number"]. I use jquery to do this but the way I did is not perfect. If there's a value in the field, the value will get erase if the number value is change because of using .remove(). Is there a better way to doing this?
<body>
<input type="number" id="num" min="0" max="20" required/>
<div class="dynamicInput"></div>
</body>
<script>
$('#num').bind('keyup mouseup', function () {
$('.dynamicInput .row').remove();
$('.dynamicInput h4').remove();
if ($(this).val() > 0) {
$('.dynamicInput').append('<h4>Please fill in the name and email of each extra attendees</h4>');
var num = $(this).val();
for (var i = 0; i < num; i++) {
$('.dynamicInput').append('<div class="row"><div class="col1"><input type="text" name="attendeesName' + i + '" placeholder="Name" required /></div><div class="col2"><input type="text" name="attendeesEmail' + i + '" placeholder="Email" required /></div></div>');
}
}
});
</script>
My Fiddle
Try something like this. Instead of removing all of the inputs every time, this just removes the ones on the end, or adds more to the end.
The main difference between this one and yours is that I added var totNum = 0; to keep track of the current number of input there are. I then used that to determine how many to add/remove.
var totNum = 0;
$(document).on('keyup mouseup', '#num', function(){
var num = $(this).val();
if (num != "")
{
if (totNum == 0)
$('.dynamicInput').append('<h4>Please fill in the name and email of each extra attendees</h4>');
for (var i = num; i < totNum; i++)
{
$('.dynamicInput .row:last-child').remove();
}
for (var i = totNum; i < num; i++)
{
$('.dynamicInput').append('<div class="row"><div class="col1"><input type="text" name="attendeesName' + i + '" placeholder="Name" required /></div><div class="col2"><input type="text" name="attendeesEmail' + i + '" placeholder="Email" required /></div></div>');
}
totNum = num;
if (totNum == 0)
{
$('.dynamicInput h4').remove();
$('.dynamicInput .row').remove();
}
}
});
input[type="number"] {
width: 200px;
height: 30px;
font-family: Arial, sans-serif;
font-size: 20px;
}
.row {
display: block;
margin-bottom: 15px;
}
body {
width: 100%;
padding: 40px;
}
input[type="text"] {
width: 100%;
}
.col1,
.col2 {
width: 45%;
display: inline-block;
margin-right: 10px;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
<body>
<input type="number" id="num" min="0" max="20" required/>
<div class="dynamicInput"></div>
</body>
It's easier and less likely to fail using a data structure as a skeleton upon which you can build the view. Note that this technique requires an extra computation in order to save user inputs, this is the reason why I've added the "change" event.
In the following code snippet, I've made two panels side by side. The left one is a list of inputs, very close to yours, easy to adapt to your needs, while the right one allows to see the evolution of the "data" array according to user actions.
Both panels rely on the "data" array, in other words, as soon as new items are added to or removed from "data", or a single item is updated, both panels are fully rebuilt. Note that the "change" event takes advantage of event delegation in order to deal with newly added inputs.
Finally, the "update" functions update the entire data source or a single item of the data source when the corresponding input changes, while the "render" functions draw on the data source to keep the panels in sync with the data. By the way, the right panel is rendered once at starting.
$(function () {
var data = []; // data source
var $num = $('#num'); // input for number of rows
var $left = $('#left'); // left panel
var $right = $('#right'); // right panel
// render the right panel at starting
renderRightPanel();
// when the number of rows changes:
// - rebuild the left panel entirely
// - keep the data list up to date
// - print the array to the right panel
$num.on('keyup mouseup', function () {
renderLeftPanel($(this).val());
updateList();
renderRightPanel();
});
// when a value changes:
// - keep the data item up to date
// - print the array to the right panel
$left.on('change', 'input', function () {
var i = $left.find('input').index(this);
updateItem(i, $(this).val());
renderRightPanel();
});
// updates the data list
function updateList () {
data = $left.find('input').map(function () {
return $(this).val();
}).get();
}
// updates a single data item
function updateItem (index, value) {
data[index] = value;
}
// refreshes the DOM of the right panel
function renderRightPanel () {
$right.html('<pre>data = ' + (
JSON.stringify(data, 0, 4)
) + '</pre>');
}
// refreshes the DOM of the left panel
function renderLeftPanel (nLines) {
var i;
var html = '';
if (nLines > 0) {
html = '<h4>Heading</h4>';
for (i = 0; i < nLines; i++) {
html += '<div><input value="' + (data[i] || '') + '" /></div>';
}
}
$left.html(html);
}
});
body * {
padding: 0;
margin: 0;
}
h4, input {
margin-bottom: .5em;
}
#panels {
border: 1px solid black;
}
#panels > div {
display: table-cell;
padding: 1em;
}
#right {
border-left: 1px solid black;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div>Number of inputs: <input id="num" type="number" value="0" /></div>
<div id="panels">
<div id="left"></div
><div id="right"></div>
</div>
Disable and hide extra elements instead of removing them. That will prevent them from getting posted, and also retain the previous value of all values that have been entered. See fiddle
One last point, if you don't want to retain values of hidden elements, change .hide() to .hide().val("")
<body>
<input type="number" id="num" min="0" max="20" required/>
<div class="dynamicInput">
<h4>Please fill in the name and email of each extra attendees</h4>
</div>
</body>
<style>
.col1, .col2 { display: inline; width: 48%; margin-right: 2%; }
.row { padding: 5px; }
</style>
<script>
for (var i = 0; i < 20; i++) {
$('.dynamicInput').append('<div class="row"><div class="col1"><input type="text" name="attendeesName' + i + '" placeholder="Name" required /></div><div class="col2"><input type="text" name="attendeesEmail' + i + '" placeholder="Email" required /></div></div>');
}
$('#num').bind('keyup mouseup', function () {
var num = parseInt($(this).val());
$('.dynamicInput .row')
.slice(num)
.hide()
.attr('disabled','disabled');
if ( num > 0) {
$('.dynamicInput .row')
.slice(0,num).show()
.removeAttr('disabled');
$('.dynamicInput h4').show();
} else {
$('.dynamicInput h4').hide();
}
}).trigger('keyup');
</script>
Off-hand, you could cache the values within javascript to resist losing them between #num changes. e.g.
(function($){
var $num = $('#num'),
$dynamic = $('.dynamicInput');
cache = {};
$dynamic.on('change', 'input', function(e){
cache[$(this).prop('name')] = $(this).val();
});
$num.on('change keyup mouseup', function(e){
$dynamic.empty();
var val = parseInt($(this).val(), 10);
if (!isNaN(val) && val > 0){
$('<h4>')
.text('Please fill in the name and email of each extra attendees')
.appendTo($dynamic);
for (var i = 0; i < val; i++){
var nameName = 'attendeesName' + i,
emailName = 'attendeesEmail' + i;
var $row = $('<div>',{'class':'row'}),
$col1 = $('<div>',{'class':'col1'}).appendTo($row),
$col2 = $('<div>',{'class':'col2'}).appendTo($row);
$('<input>',{
'type': 'text',
'name': nameName,
'placeholder': 'Name',
'required': 'true'
}).val(cache[nameName] || '').appendTo($col1);
$('<input>',{
'type': 'email',
'name': emailName,
'placeholder': 'Email',
'required': 'true'
}).val(cache[emailName] || '').appendTo($col2);
$row.appendTo($dynamic);
}
}
});
})(jQuery);
input[type="number"] {
width:200px;
height:30px;
font-family:Arial, sans-serif;
font-size:20px;
}
.row {
display:block;
margin-bottom:15px;
}
body{
width:100%;
padding:40px;
}
input[type="text"]{
width:100%;
}
.col1, .col2{
width:45%;
display:inline-block;
margin-right:10px;
}
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css" rel="stylesheet">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<input type="number" id="num" min="0" max="20" required/>
<div class="dynamicInput"></div>
Here is an attempt to improve the accepted answer:
$(function () {
var $num = $('#num');
var $panel = $('#panel');
var h4 = '<h4>Heading</h4>';
var row = '<div><input /></div>';
$num.on('mouseup keyup', function () {
var n, $inputs;
var value = $(this).val();
if (value <= 0) {
$panel.empty();
}
else {
$inputs = $panel.find('input');
// get the number of inputs already added
n = $inputs.size();
// add your heading if there is no input
if (n === 0) {
$panel.append(h4);
}
// the user wants less inputs
if (value < n) {
$inputs.slice(value).remove();
}
// the user wants more inputs
else if (value > n) {
$panel.append(
// a little trick, see below
new Array(value - n + 1).join(row)
);
}
}
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div>Number of inputs: <input id="num" type="number" value="0" /></div>
<div id="panel"></div>
A word on the "array join trick":
var a = [1, 2, 3, 4];
console.log(a.join('+'));
// prints "1+2+3+4"
var b = new Array(4); // an array of 4 undefined items
console.log(b.join('+'));
// prints "+++"
var c = new Array(3);
console.log('<ul>' + c.join('<li>item</li>') + '</ul>');
// prints "<ul><li>item</li><li>item</li></ul>"
This is what exactly you are looking for,
<%# page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
<script>
$(document).ready(function(){
$("#num").keyup(function(){
$('.dynamicInput .row').remove();
$('.dynamicInput h4').remove();
if ($(this).val() > 0) {
$('.dynamicInput').append('<h4>Please fill in the name and email of each extra attendees</h4>');
var num = $(this).val();
for (var i = 0; i < num; i++) {
$('.dynamicInput').append('<div class="row"><div class="col1"><input type="text" name="attendeesName' + i + '" placeholder="Name" required /></div><div class="col2"><input type="text" name="attendeesEmail' + i + '" placeholder="Email" required /></div></div>');
}
}
});
});
</script>
</head>
<body>
<input type="number" id="num" min="0" max="20" required/>
<div class="dynamicInput"></div>
</body>
</html>

Pressing enter key submit the form?

HTML code:
<html>
<head>
<title>Registration Form</title>
<meta charset="utf-8" />
<link rel="stylesheet" href="css/style.css">
<script>
function submitAlbum(){
var str1 = removeSpaces(document.getElementById('txtCaptcha').value);
var str2 = removeSpaces(document.getElementById('txtInput').value);
alert("condition1 is ..."+str1);
alert("condition2 is ..."+str2);
alert("condition3 is ..."+str1 == str2);
if (str1 == str2)
{
//alert("Entered captcha is correct");
}
else{
alert("Entered captcha is wrong");
document.getElementById("txtInput").value="";
return false;
}
var frm=document.getElementById("custRegistration");
frm.action="CustomerinfoServlet?formidentity=doRegistrations";
frm.submit();
}
</script>
</head>
<body style=" background-color:#f9f9f9" onload="DrawCaptcha();">
<div style="width: 100%; background-repeat:no-repeat; margin-top:30px; height:546px; background-image: url('images/mac.png')">
<br/><br/>
<div style="margin: 0 auto; background-color: #ffffff; opacity:0.9; border: 1px solid #D7EBFF; width: 400px; padding: 15px; height: 440px; margin-left: 56%;">
<form class="form" name ="custRegistration" id="custRegistration" onsubmit="return submitAlbum(this)" action="download.jsp" method="post" >
<p class="name">
<label for="name">Name <span style="color:red">*</span>:</label>
<input type="text" name="name" id="name" placeholder="" pattern="[A-Za-z ]{3,20}" required/>
<input type="hidden" id="formidentity" name="formidentity" value="doRegistrations"/>
</p>
<p class="email">
<label for="email">Email Id <span style="color:red">*</span>:</label>
<input type="email" name="email" id="email" pattern="((\w+\.)*\w+)#(\w+\.)+(com|org|net|us|info|biz|co)" required aria-required="true" placeholder="" required/>
</p>
<p class="Captcha" style="margin-top:5%; width: 100%;">
<div style="margin:0 0 0 1%">
<label class="captchalabel" style="width:38%; float: left;"><span style="margin:0 0 0 9%">Enter the text </span> <span style="color:red">*</span>:</label>
<input type="text" name="txtInput" id="txtInput" style="float: left;" required/> </div>
<div style="width: 20%; float: right;">
<input type="text" id="txtCaptcha" style="background-color:#E7EBF5; text-align:center; margin: 19px 104px 0px 0px; width: 120px; border-radius:0px; border:1px solid #ccc; font-weight:bold; font-family:Arial; " />
<input type="image" id="btnrefresh" onclick="DrawCaptcha();" src="images/captcha.png"/>
</div>
</p>
<p class="submit">
<input type="submit" value="Submit" />
</p>
</form>
</div>
</div>
</body>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<script type="text/javascript" src="js/jquery.realperson.js"></script>
<script type="text/javascript">
//Created / Generates the captcha function
function DrawCaptcha()
{
var a = Math.floor(Math.random() * 10)+ '';
var b = Math.floor(Math.random() * 10)+ '';
var c = Math.floor(Math.random() * 10)+ '';
var d = Math.floor(Math.random() * 10)+ '';
var e = Math.floor(Math.random() * 10)+ '';
var f = Math.floor(Math.random() * 10)+ '';
var g = Math.floor(Math.random() * 10)+ '';
var code = a + ' ' + b + ' '+ c + ' ' + d + ' ' + e + ' '+ f + ' ' + g;
document.getElementById("txtCaptcha").value = code
}
// Remove the spaces from the entered and generated code
function removeSpaces(string)
{
return string.split(' ').join('');
}
</script>
</html>
In this I have an issue. The problem is whenever I enter any text in the captcha textbox and press enter key. Then the captcha code is changing, ie, numbers are refreshing.
Also form is getting submit and getting the message ('captcha is wrong').
Can anyone tell me how to stop form submit when we press enter key after entering captcha in textbox?
Well you could disable the Enter button on the captcha input field using jQuery.
An example being:
$('#txtInput').bind("keypress", function (e) {
if (e.keyCode == 13) return false;
});
Where keyCode == 13 is the Enter key
Update
To add the above code in your file, just copy and paste this into your html:
<script type="text/javascript">
$(document).ready(function(){
$('#txtInput').bind("keypress", function (e) {
if (e.keyCode == 13) return false;
});
});
</script>
You can do this using the following jQuery code:
$('#custRegistration').bind("keyup keypress", function(e) {
var code = e.keyCode || e.which;
if (code == 13) {
e.preventDefault();
return false;
}
});
LOL :)
AS dfsq said in comment:
"Why do you press Enter if you don't want to submit the form?"
But to block sending form with enter on input do this:
$('body').on('keydown', '#chaptcha_input', function(e) {
if(e.which == 13 && !e.shiftKey) {
e.preventDefault();
}
});
Try this
$('#txtInput').on("keyup",function(e){
if(e.keyCode == 13)
return false;
// do your stuff here if not enter key pressed
});

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