We need to have a textbox where you enter a number, hit a button, and it increments by 1, while staying in the same text box. Here is the code I have so far:
<form action=#>
<p>
Current Count...<input type="text" id="txtCounter" value="0">
</p>
<p>
<input type="button" value="Increment Count" id="btnIncrement" onclick="btnIncrement_onclick()">
<input type="reset">
</p>
</form>
<noscript>This website requires JavaScript to be enabled.</noscript>
JavaScript:
function btnIncrement_onclick() {
// get textbox and assign to a variable
var countTextbox = document.getElementById("txtCounter");
var txtCounterData = txtCounter.value;
var countTextbox.value = 0++;
}
If someone could explain to me how to do it not just give me the answer. I don't know why I'm having such a hard time with this.
Try the following simple code :
function btnIncrement_onclick()
{
//asign the textbox to variable
var textbox = document.getElementById("txtCounter");
//Get the value of textbox and add 1 then update the textbox
textbox.value = parseInt(textbox.value)+1;
}
<form action=#>
<p>
Current Count...<input type="text" id="txtCounter" value="0">
</p>
<p>
<input type="button" value="Increment Count" id="btnIncrement" onclick="btnIncrement_onclick()">
<input type="reset">
</p>
</form>
<noscript>This website requires JavaScript to be enabled.</noscript>
Hope this helps.
In your HTML:
In your html you had a onclick="btnIncrement_onclick()" and that means every click will triggers your function.
In your JS:
function btnIncrement_onclick() {
// Named as countTextbox you input. sou we can use it later.
var countTextbox = document.getElementById("txtCounter");
// Get the current value attribute of it, initialy 0.
var txtCounterData = txtCounter.value;
// The line above is not being used. but you can check it with a console.log like this:
console.log(txtCounterData);
// Now you are calling again your input and changing his value attribute. this ++ means a increment. so we are increasing +1;
countTextbox.value++;
}
You should read more about increment and operators and DOM (the way whe select the tag by id, and again selected his attribute).
Sorry didn't found a good source in english.
Related
I have a textfield:
Voornaam: <h3 class="title1">Kevin</h3>
<input type="text" id="myTextField1" />
<input type="submit" id="byBtn" value="Change" onclick="change1()"/><br/>
I can set a value of this using this function:
function change1(){
var myNewTitle = document.getElementById('myTextField1').value;
if( myNewTitle.length==0 ){
alert('Write Some real Text please.');
return;
}
var titles = document.getElementsByClassName('title1');
Array.prototype.forEach.call(titles,title => {
title.innerHTML = myNewTitle;
});
}
Now in my other page, I want to use the value. I know I can for example pass a value from one page to another like this:
<a href='convert.php?var=data'>converteren.</a>
And then for example show it by doing this in the other page:
echo $_GET['var'];
But I cant really seem to figure out how to use the value which I've set using my textfield.
So my goal for now is to display the value I've set using my textfield in the other page using the method I just described.
Basically all I want to happen is for my textfield to change the value inside here aswell:
<a href='convert.php?var=data'>converteren.</a>
So where data is the value, I want it to become what I've put in the textfield.
Could anybody provide me with an example?
I've altered a bit your javascript code to make the link as you want.
To explain the answer, i've added document.getElementById("myLink").href="convert.php?var=" + myNewTitle ; which updates your a href while your function runs and is not empty.
function change1(){
var myNewTitle = document.getElementById('myTextField1').value;
if( myNewTitle.length==0 ){
alert('Write Some real Text please.');
return;
}
document.getElementById("myLink").href="convert.php?var=" + myNewTitle ;
var titles = document.getElementsByClassName('title1');
Array.prototype.forEach.call(titles,title => {
title.innerHTML = myNewTitle;
});
}
<a id="myLink" href='#'>converteren.</a>
Wrap your inputs inside a form element.
In the action attribute, specify the destination url.
In the method attribute, choose between GET and POST.
For example:
<form method="GET" action="convert.php">
<input type="text" id="myTextField1" />
<input type="submit" id="byBtn" value="Change" onclick="change1()"/>
</form>
Clicking the submit button will call "convert.php?myTextField1={value}".
I'm just learning HTML, CSS, and Javascript and having a tough time grasping the JS. I've been working on this simple issue now for literally 6 hours. I've checked plenty of posts on SO, W3, re-read relevant chapters in Jon Duckett's book, and tried every combination I could think of in the code.
What I need to do is take a username from an input field and run it through a function to change it in some way. I've seen other's posts with similar questions but haven't been able to create a solution yet. The issue that keeps happening is that when I place what should be the user input back to the page it uses the actual words name.toUpperCase() rather than the value I've given the variable name. I tried converting the name to uppercase in its own statement and then assigning that a variable, but that didn't work either. It seems like my js is never giving "name" a value to begin with.
JS:
var name = document.getElementById('nameEntry');
var compliment = document.getElementById('compliment');
var input = document.getElementById('submitjs');
input.onclick = transformName;
function transformName () {
var elcompliment = document.getElementById('compliment');
elcompliment.textContent = 'name.toUpperCase( )' + ' YOU ROCK!';
};
HTML:
<div class="jsform">
<h2> Enter your name and see it change!</h2>
<input type="text" name="nameEntry" id="nameEntry" />
<input type="submit" name="submitjs" value="submit" id="submitjs"/>
<div>
<p id="compliment">Great Job!</p>
</div>
</div>
Since you are retrieving input value using element's id, there is no need for form.
function transformName () {
var name = document.getElementById('nameEntry').value;
var compliment = document.getElementById('compliment');
compliment.innerHTML = name.toUpperCase( ) + ' YOU ROCK!';
};
<div class="jsform">
<h2> Enter your name and see it change!</h2>
<input type="text" name="nameEntry" id="nameEntry" />
<input type="button" onclick="transformName()" value="Transform me"/>
<div>
<p id="compliment">Great Job!</p>
</div>
</div>
The name variable currently refers to DOM element. The value property returns the data entered in the input element.
The value property sets or returns the value of the value attribute of a text field.
var name = document.getElementById('nameEntry').value;
var compliment = document.getElementById('compliment');
var input = document.getElementById('submitjs');
input.onclick = transformName;
function transformName () {
var name = document.getElementById('nameEntry').value;
var elcompliment = document.getElementById('compliment');
elcompliment.innerHTML = name.toUpperCase()+' YOU ROCK!';
};
<div class="jsform">
<h2> Enter your name and see it change!</h2>
<input type="text" name="nameEntry" id="nameEntry" />
<input type="submit" name="submitjs" value="submit" id="submitjs" />
<div>
<p id="compliment">Great Job!</p>
</div>
</div>
Hi I am trying to install a merchant facility onto my website and it needs to submit a value $vpc_Amount which is the amount purchased in cents.
What I need to do is multiply the amount entered by the user ($amount) by 100 to get $vpc_Amount.
I tried the following but it isn't working.
<input type="text" ID="A1" name="amount"onkeypress="process1()">
<input type="hidden" id="A2" name="vpc_Amount">
And then the javascript
function process1() {
f1 = document.getElementById("A1").value;
total = f1*1000;
document.getElementById("A2").value = total;
}
What is happening is it is occasionally working but most of the time it doesn't. I know there is something wrong with the script so hence asking here.
Try to use onkeyup function -
<input type="text" id="A1" name="amount" value="" onkeyup="process1();" />
<input type="hidden" id="A2" name="vpc_Amount" />
javascript function -
function process1() {
var f1 = document.getElementById("A1").value;
var total = (f1 * 100);
document.getElementById("A2").value = total;
}
Use Jquery. http://jquery.com/
$(function() {
$('#form_id').submit(function(){
$('#form_id').find('#A2').val('New value');
return true;
});
});
Have you tried to use onkeyup event? It might be so that onkeypress event is triggered before the character is added to text field.
<input type="text" ID="A1" name="amount" onkeyup="process1()">
Also, I would suggest that you try to convert the value of the textfield to integer and add other input handling too. Users might enter any kind of data there and it can crash your javascript code.
This code should work:
document
.getElementById('A1')
.addEventListener('keyup', function (e) {
document.getElementById('A2').value = parseInt(this.value) * 1000;
})
keypress event triggers before value changes in text field and keyup after value has changed.
Basically event trigger in order:
keydown (onkeydown)
keypress (onkeypress)
keyup (onkeyup)
Force value to be integer or you will get NaN in some cases.
I will suggest to use onblur this is the best way if you want to use the build in attribute listener if you don't use jquery. Here is example:
<!DOCTYPE html>
<html>
<body>
Enter your name: <input type="text" id="fname" onblur="myFunction()">
<p>When you leave the input field, a function is triggered which transforms the input text to upper case.</p>
<script>
function myFunction() {
var x = document.getElementById("fname");
x.value = x.value.toUpperCase();
}
</script>
</body>
</html>
And url to the example in w3 school :) http://www.w3schools.com/jsref/event_onblur.asp
First of all, I think you should use onkeypup event and not onkeypress
<input type="text" id="A1" name="amount" onkeyup="process1()" value="" />
<input type="hidden" id="A2" name="vpc_Amount" value="" />
Javascript code -
function process1() {
var f1 = parseFloat(document.getElementById("A1").value);
var total = f1*100; //you said 100 so, I changed to 100
document.getElementById("A2").value = total;
}
jQuery code for the same -
jQuery(document).ready(function($){
$("#A1").keyup(function(){
var total = parseFloat($("#A1").val()) * 100;
$("#A2").val(total);
});
});
Your code can be simplified by making use of the fact that form controls are available as named properties of the form baed on their name. This removes the requirement to add IDs to form controls that must have a name anyway.
Pass a reference to the control in the listener:
<input type="text" name="amount" onkeyup="process1(this)">
<input type="hidden" name="vpc_Amount">
Then use the passed reference to get the form and other controls:
function process1(element) {
element.form.vpc_Amount.value = element.value * 100;
}
You may wish to use the change event instead to save updating the hidden field unnecessarily while the user is typing and also to catch changes that aren't based on key presses (e.g. pasting from the context menu).
You should also do some validation of the values entered so the user doesn't attempt to send the form with invalid values (noting that you must also do validation at the server as client side validation is helpful but utterly unreliable).
<input type="hidden" id="prevTicketNo" value="6"/>
<script>
var ticketNo = document.getElementById(prevTicketNo).value +1;
document.getElementById('currentTicketNo').value = ticketNo;
</script>
<input id="currentTicketNo" value=""/>
What I am trying to do:
The prevTicketNo is a value captured from somewhere else. I need that to load as a hidden field so I used type="hidden". Once the value in this textbox is loaded, I need to +1 so that the number increases for my current ticket.
Is the right approach?
You must change the value of the first input to integer.
var ticketNo =parseInt((document.getElementById('prevTicketNo').value),10)+1;
document.getElementById('currentTicketNo').value = ticketNo;
JSBin
Javascript:
var hiddenVal = document.getElementById("prevTicketNo");
var newTicketNo = Number(hiddenVal.value) + 1;
alert(newTicketNo);
HTML:
<input type="hidden" id="prevTicketNo" value="6"/>
If you can get the previous ticket number and output it into a hidden field (obviously via some kind of server side script), why can't you just output it directly into your text input?
eg. In PHP write this:
<input id="currentTicketNo" value="<?php echo $prevTicketNo + 1; ?>" />
I have a simple HTML form that asks a user to input their name, SKU, quantity, and comments. This is for a simple inventory request system.
<html>
<body>
<form id="myForm" method="post">
<input type="submit">
<br>Name: <input type="text" name="form[name]">
<br>SKU: <input type="text" name="form[SKU1]">
<br>Quantity: <input type="text" name="form[quantity1]">
<br>Comment: <input type="text" name="form[comment1]">
</form>
Add item
<script>
var num = 2; //The first option to be added is number 2
function addOption() {
var theForm = document.getElementById("myForm");
var newOption = document.createElement("input");
newOption.name = "form[SKU"+num+"]"; // form[varX]
newOption.type = "text";
theForm.appendChild(newOption); //How can I add a newline here?
optionNumber++;
}
</script>
</body>
</html>
Currently I can only get it working where it will add a single form value. I would like to recreate the entire myForm except for the name field with a single click.
Your post is very old, so presumably you've found an answer by now. However, there are some things amiss with your code.
In the JavaScript code you have
var num = 2;
This is the number that is incremented to keep track of how many "line-items" you will have on the form. In the function addOption(), though, instead of incrementing num you have
optionNumber++;
You never use optionNumber anywhere else. Your code works once, when you add the first item, but since you increment the wrong variable, you are effectively always adding option 2.
Oh, and adding the newline: you need to append a <br> element.