How Can I use form items in javascript - javascript

I want to use HTML form elements in JavaScript. I used them like this but it doesn't work:
<form name="M">
<input name="in1" type="text" id="in1">
<input type="button" name="btn1" id="btn1" value="Check" onclick="f1()">
</form>
<script src="script.js"></script>
...and the JavaScript code was like this:
var s1 = 60;
function f1() {
``
if (document.M.elements[0] == s1) {
window.location = 'tick.htm';
} else {
window.location = 'cross.htm';
}
}
What is wrong here?


Just to give some clarification on why this was not working. In the test, document.M.elements[0] is a reference to the input object, not the value of the input. Using document.M.elements[0].value gives us the current value of the input.
//Ignore this, for display only.
function output(msg) {
var element = document.getElementById('output');
element.innerHTML = msg;
};
function f1() {
var s1 = 60;
if (document.M.elements[0].value == s1) {
output('Pass');
} else {
output('Fail');
}
}
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>JS Bin</title>
</head>
<body>
<form name="M">
<input name="in1" type="text" id="in1">
<input type="button" name="btn1" id="btn1" value="Check" onclick="f1()">
</form>
<b id="output"></b>
</body>
</html>

Related

Add element to an Object (not array) in JS

I'm new to JS and I'm just practicing. I have this form that sets data in an object which is later displayed on the DOM. It works but it just shows a "key" at a time. If I add new elements they replace the existing one.
class Items {
constructor(namee, surnamee) {
this.namee = namee;
this.surnamee = surnamee;
}
}
function Func() {
event.preventDefault();
var nameval = document.getElementById('namee').value;
var surnval = document.getElementById('surnamee').value;
let newIt = new Items(nameval, surnval);
console.log(newIt)
document.getElementById('box').innerHTML = newIt.namee + " " + newIt.surnamee
}
<form onsubmit={Func()}>
<input id="namee" > </input>
<input id="surnamee"> </input>
<button type=submit> send </button>
</form>
<p id="box"> </p>
I've tried the push() method but it works with arrays. I've also tried to create an object instead of a class but I get the same grief
Thank you in advance

Maybe you looking for this:
class Items {
constructor(namee, surnamee) {
this.namee = namee;
this.surnamee = surnamee;
}
}
function Func() {
event.preventDefault();
var nameval = document.getElementById('namee').value;
var surnval = document.getElementById('surnamee').value;
let newIt = new Items(nameval, surnval);
console.log(newIt)
document.getElementById('box').innerHTML += `<p>` + newIt.namee + " " + newIt.surnamee + `</p>`;
}
<form onsubmit={Func()}>
<input id="namee" > </input>
<input id="surnamee"> </input>
<button type=submit> send </button>
</form>
<p id="box"> </p>

class Items {
constructor(namee, surnamee) {
this.namee = namee;
this.surnamee = surnamee;
}
}
function Func() {
event.preventDefault();
var nameval = document.getElementById('namee').value;
var surnval = document.getElementById('surnamee').value;
let newIt = new Items(nameval, surnval);
let html = `${document.getElementById('box').innerHTML}<p>${newIt.namee} ${newIt.surnamee}</p>`
document.getElementById('box').innerHTML = html
}
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title></title>
</head>
<body>
<form onsubmit={Func()}>
<input id="namee" > </input>
<input id="surnamee"> </input>
<button type=submit> send </button>
</form>
<p id="box"> </p>
</body>
</html>
Hope it help :)
or you can use this
https://www.w3schools.com/jsref/met_node_appendchild.asp

any stored value can be wrapped in a div tag
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title></title>
</head>
<body>
<form onsubmit={Func()}>
<input id="namee" > </input>
<input id="surnamee"> </input>
<button type=submit> send </button>
</form>
<p id="box"> </p>
</body>
</html>
<script>
class Items {
constructor(namee, surnamee) {
this.namee = namee;
this.surnamee = surnamee;
}
}
function Func() {
event.preventDefault();
var nameval = document.getElementById('namee').value;
var surnval = document.getElementById('surnamee').value;
let newIt = new Items(nameval, surnval);
console.log(newIt)
const row = document.createElement('div');
row.innerText = newIt.namee + " " + newIt.surnamee;
document.getElementById('box').appendChild(row);
}
</script>

How do I create an error alert for an invalid input?

I am creating a date input and I want an error alert if the date input is left blank.
currently I have and it doesnt work:
<!Doctype html>
<html>
<head>
<script type="text/javascript">
function validateDate(value) {
var a = document.getElementById("date").value;
if (a = = = "") {
window.alert("Error");
return false;
}
}
</script>
</head>
<body>
<h1>Tee Time Sign-up Form</h1>
<form>
<div id="teeDate">
Date:<input type=“date” id=“date” name=“date”><br>
<button id=teeTime onClick="validateDate()">Submit</button><br>
</div>
</form>
</body>
</html>

Do not put spaces in your operators, use === not = = =, a better use to say if a !== "" if a is NOT an empty string
Try this:
<!DOCTYPE html>
<html>
<head>
</head>
<body>
<h1>Tee Time Sign-up Form</h1>
<form>
<div id="teeDate">
Date:<input type="date" id="date" name="date" /><br />
<button id="teeTime">Submit</button><br />
</div>
</form>
<script type="text/javascript">
var button = document.getElementById("teeTime");
function validateDate(value) {
if (value === "") {
window.alert("Error");
return false;
}
}
button.addEventListener("click", function (e) {
var value = document.getElementById("date").value;
validateDate(value);
});
</script>
</body>
</html>

return data from showModalDialog

I would like to continue working with the data from the ModalDialog in the function abfrage().It is important that I get the data there I want to return it.i would like to create a loop with several input fields later on html, so i don't write this on the html page.
function abfrage(){
let count = 1;
let html = '<input type="text" name="text">';
var t = HtmlService.createTemplateFromFile('dialogForm');
let dialog = ui.showModalDialog(t.evaluate(), 'Hello');
}
dialogForm.html
<!DOCTYPE html>
<html>
<head>
<base target="_top">
</head>
<body>
<h1>Userform</h1>
<table>
<?!= html ?>
</table>
<input type="button" value="Close" onclick="google.script.host.close()" >
<input type="submit" value="Submit" class="action">
</body>
</html>

gs:
function abfrage(){
let count = 1;
let html = '<form><br /><input type="text" name="text">';
var t = HtmlService.createTemplateFromFile('dialogForm');
let dialog = ui.showModalDialog(t.evaluate(), 'Hello');
}
function serversidefunctionname(obj) {
var name=obj.name;
//process name
//return html if desired
}
HTML:
<!DOCTYPE html>
<html>
<head>
<base target="_top">
</head>
<body>
<h1>Userform</h1>
<?!= html ?>
<br /><input type="button" value="Close" onclick="google.script.host.close()" >
<br /><input type="button" value="Submit" class="action" onClick="processForm(this.parentNode);" />
</form>
<script>
function processForm(obj) {
google.script.run
.withSuccessHandler(function(retobj){
//process return from server side function if any
})
.serversidefunctionname(obj);
}
</script>
</body>
</html>

Not able to print the array once new item added using push method

I am new to JavaScript. below is my code to print array once new item is added but not printing the array. can someone help. below is my code. I am also not getting any error in console. I have used push method to add new item to array and once added calling display function to print the array.
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Untitled Document</title>
</head>
<body>
<input type="text" id="item" >
<br>
<br/>
<input type="button" value="Push" onClick="Push()">
<input type="button" value="Pop" onClick="Pop()">
<input type="button" value="Shift" onClick="Shift()">
<input type="button" value="UnShift" onClick="UnShift()">
<div id="list_items"> </div>
<script type="text/javascript">
var arra1=[12,34,56,67,78,89,87];
function display()
{
var lists=document.getElementById('list_items');
document.write("Array items are:<br>" );
for(var i=0;i<arra1.length;i++)
{
var para = document.createElement('div');
lists.appendChild(para);
para.innerHTML = arra1[i];
}
}
function Push()
{
var item1=document.getElementById("item").value;
arra1.push(item1);
display();
}
function Pop()
{
arra1.pop();
display();
}
</script>
</body>
</html>

So I just Edited this a little bit and got it working.
var arra1=[12,34,56,67,78,89,87];
function display()
{
var lists=document.getElementById('list_items');
for(var i=0;i<arra1.length;i++)
{
var para = document.createElement('p');
lists.appendChild(para);
para.innerHTML = arra1[i];
}
}
function Push()
{
var item1=document.getElementById("item").value;
arra1.push(item1);
display();
}
function Pop()
{
arra1.pop();
display();
}
<html>
<head>
<meta charset="utf-8">
<title>Untitled Document</title>
</head>
<body>
<input type="text" id="item" >
<br>
<br/>
<input type="button" value="Push" onClick="Push()">
<input type="button" value="Pop" onClick="Pop()">
<input type="button" value="Shift" onClick="Shift()">
<input type="button" value="UnShift" onClick="UnShift()">
<div id="list_items">
</div>
<scrip
</script>
</body>
</html>

javascript function not calling possibly due to scope issue

I am looking to call my clear() JS function to clear the text values in some input fields on my webpage, but for some reason, the function doesn't appear to be called correctly. I believe this may be a scope issue, but I'm not sure.
Here is my markup, script and styling kept together for ease-of-use currently, but will be mended once scripting is finalized:
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Quadratic Root Finder</title>
<script>
function calculateQuad()
{
var inputa = document.getElementById('variablea').value;
var inputb = document.getElementById('variableb').value;
var inputc = document.getElementById('variablec').value;
root = Math.pow(inputb,2) - 4 * inputa * inputc;
root1 = (-inputb + Math.sqrt(root))/2*inputa
root2 = (-inputb + Math.sqrt(root))/2*inputa
document.getElementById('root1').value = root1;
document.getElementById('root2').value = root2;
if(root<'0')
{
alert('This equation has no real solution.')
}
else {
if(root=='0')
{
document.getElementById('root1').value = root1
document.getElementById('root2').value = 'No Second Answer'
}
else {
document.getElementById('root1').value = root1
document.getElementById('root2').value = root1
}
}
}
function clear()
{
document.getElementById('variablea').value = "";
document.getElementById('variableb').value = "";
document.getElementById('variablec').value = "";
}
</script>
<style>
#container
{
text-align: center;
}
</style>
</head>
<body>
<div id="container">
<h1>Quadratic Root Finder!</h1>
<form id="form1">
a:<input id="variablea" value="" type="text">
<br/>
b:<input id="variableb" value="" type="text">
<br />
c:<input id="variablec" value="" type="text">
<br />
<input id="calculate" value="Calculate!" type="button" onClick="calculateQuad()">
<input id="erase" value="Clear" type="button" onClick="clear()">
<br />
<br />
Roots:
<br />
<input id="root1" type="text" readonly>
<br />
<input id="root2" type="text" readonly>
</form>
</div>
</body>
</html>

You must rename the 'clear' method. Try naming it 'clearFields' or something. (;
Also, if you only want to reset the form fields you can also do this:
onClick="this.form.reset()"

You can avoid the issue with function naming entirely by using:
document.getElementById("calculate").onclick = function () {
...
};
document.getElementById("erase").onclick = function () {
...
};
This is actually a preferred method of adding event handlers by web developers because it avoids cluttering the HTML code with inline snippets of JavaScript while retaining cross-browser compatibility.

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