I am trying to create a text field and button that reads a width and height of a quadrilateral. You enter the width and height, click the button, then a quad appears with those specifications. For some reason I can't get Javascript to read a measurement correctly, so nothing happens.
Here's what I have:
<html>
<style>
</style>
<head>
<title>Make a Polygon!</title>
<script language="javascript">
// var element = document.createElement('div');
// element.className = "someID";
function func(form) {
var element = document.createElement('div');
element.className = "someID";
var wide = form.width.value;
document.body.appendChild(element);
// this properties work//
var a = document.getElementsByClassName('someID');
for(var i in a ){
a[i].style.zIndex='3';
a[i].style.color='rgb(255,255,0)';
a[i].style.background='rgb(0,102,153)';
//a[i].style.width=wide;
a[i].style.width='70px';
a[i].style.height='200px';
a[i].style.left='500px';
a[i].style.top='90px';
}
}
</script>
</head>
<body>
<form name="widthForm" method="get"> Width:
<input type="text" name="width" value=""> <p>
<input type="submit" name="button" value="Create" onclick="func(this.form)">
</form>
<br>
</body>
</html>
So far I'm testing the width only.
It's partially based on code found here:
How to Set the Left and Top CSS Positioning of a DIV Element Dynamically Using JavaScript
You're submitting the page, and instantly refreshing it. Change the submit element to just a button :)
Change submit to button, and add return false statement to limit the button submits form when click, because if do that, the page will be refreshed and div added in javascript could not be seen. Try this:
<html>
<style>
</style>
<head>
<title>Make a Polygon!</title>
<script language="javascript">
// var element = document.createElement('div');
// element.className = "someID";
function func(form) {
var element = document.createElement('div');
element.className = "someID";
var wide = form.width.value;
var height = form.height.value;
document.body.appendChild(element);
// this properties work//
var a = document.getElementsByClassName('someID');
for(var i in a ){
a[i].style.zIndex='3';
a[i].style.color='rgb(255,255,0)';
a[i].style.background='rgb(0,102,153)';
//a[i].style.width=wide;
a[i].style.width=wide;
a[i].style.height=height;
a[i].style.left='500px';
a[i].style.top='90px';
}
}
</script>
</head>
<body>
<form name="widthForm" method="get">
Width:
<input type="text" name="width" value="">
Height:
<input type="text" name="height" value="">
<br>
<p>
<input type="button" name="button" value="Create" onclick="func(this.form);return false;">
<!-- ^^^^^^ ^^^^^^^^^^^^^-->
</form>
<br>
</body>
</html>
Related
I need to create code which automatticaly calculates the circumference when the length and width are entered in two different boxes.
I managed to do so, but I want the answer to appear underneath the "calculate" button, but the answer will make the button and boxes disappear. Could someone tell me what I need to change?
Here is my code:
<!DOCTYPE html>
<html>
<body>
<form>
Width:<br>
<input id="Width" type="text" name="Width">
<br>Length<br>
<input id="Length" type="text" name="Length">
<br><br>
<input type="button" value="Calculate circumference" onclick="doMath()">
</form>
<script>
function doMath() {
var Width1 = document.getElementById('Width').value;
var Length1 = document.getElementById('Length').value;
var Circ = parseInt(Width1) + parseInt(Width1) + parseInt(Length1) + parseInt(Length1);
document.write(Circ);
}
</script>
</body>
</html>
Do not use document.write function. The write() method is mostly used for testing: If it is used after an HTML document is fully loaded, it will delete all existing HTML. Create a paragraph tag and give an id and place your result in that paragraph.
<!DOCTYPE html>
<html>
<body>
<form>
Width:<br>
<input id="Width" type="text" name="Width">
<br>Length<br>
<input id="Length" type="text" name="Length">
<br><br>
<input type="button" value="Calculate circumference" onclick="doMath()">
<p id="result">
</p>
</form>
<script>
function doMath() {
var Width1 = document.getElementById('Width').value;
var Length1 = document.getElementById('Length').value;
var Circ = parseInt(Width1) + parseInt(Width1) + parseInt(Length1) + parseInt(Length1);
//document.write(Circ);
document.getElementById("result").textContent = Circ;
}
</script>
</body>
</html>
Try adding a black paragraph to the html and then use document.getElementById("").innerHTML to change the text inside of it.
I was trying to add some rows of input to my form so I will be able to post them to the back-end in one request, and also be able to add more of the same information type if need be
this is the code that I'm using:
<!DOCTYPE html>
<head>
</head>
<body>
<form action="#" method="post">
<input id="firstElement" type="text" name="firstElement" value="">
<button onClick="addRow()">add row</button><br>
<div id="container"></div>
<input type="submit" value="submit">
</form>
<script>
function addRow() {
var container = document.getElementById("container");
var myElement1 = document.getElementById("firstElement").value;
document.getElementById("firstElement").value = "";
var i = 0;
var input1 = document.createElement("input");
input1.type = "text";
input1.name= "myElement1"+ i;
input1.disabled = "true";
input1.value = myElement1;
container.appendChild(input1);
container.appendChild(document.createElement("br"));
i++;
}
</script>
</body>
this code shows the output for a second or less and then nothing...
The default type attribute of a button element is submit, so when you click the button you're actually submitting your form. Change that easily by specifying the type to be a button instead:
<button onClick="addRow()" type="button">add row</button>
jsFiddle example
I'm working on a web form with a textbox for pets and an "add pet" button. Each time the button is clicked, an additional textbox should be displayed below the original one.
I'm assuming this would be accomplished with an onclick event, but I can't figure out how to get it to work.
Here is the code I have so far:
<html>
<head>
<title>Project 4</title>
</head>
<body>
<form name="myForm" onsubmit="return validateForm()">
Pets: <input type="text" id="pets">
<input type="button" id="addPet" value="Add Pet">
<br>
</form>
<script type="text/javascript">
function makeCopy() {
var copy = <input type="text">;
return copy;
}
</script>
</body>
</html>
There are other pieces to this as well, but none of them affect this particular problem I am having so didn't see the need to include the full code as it's fairly long.
Any suggestions are greatly appreciated.
Update:
I realize after reading the answers that I should've included more of my code to give you guys a better idea of the actual layout of my page. I have several text fields in my form and need the additional textboxes to be displayed right below the original "pets" textbox. Here's a jfiddle I threw together to give you guys a better idea of the layout. http://jsfiddle.net/a5m8nqwk/
Something like this?
<form name="myForm" id="myForm" onsubmit="return validateForm()">
Pets: <br />
<input type="text" id="pets" />
<input type="button" id="addPet" value="Add Pet" />
<br/>
</form>
document.getElementById("addPet").onclick = function() {
var form = document.getElementById("myForm");
var input = document.createElement("input");
input.type = "text";
var br = document.createElement("br");
form.appendChild(input);
form.appendChild(br);
}
Edit: I'd suggest using a table to style the input boxes, keep them in line. FIDDLE
You could easily add elements to the DOM:
function createPetField() {
var input = document.createElement('input');
input.type = 'text';
input.name = 'pet[]';
return input;
}
var form = document.getElementById('myForm');
document.getElementById('addPet').addEventListener('click', function(e) {
form.appendChild(createPetField());
});
function add(type) {
//Create an input type dynamically.
var element = document.createElement("input");
var text = document.getElementById("textId");
//Append the element in page (in span).
text.appendChild(element);
}
h1 {
color: #0000ff;
}
<h1>KIAAT</h1>
<b>Adding textbox on button click with javascript</b>
<br><br>
<form>
<input placeholder="text" name="element" hidden> </input>
<input type="button" value="Click Me" onclick="add(document.forms[0].element.value)"/>
<span id="textId"> </span>
</form>
I'm working on this HTML Page where i can add a check-box along with the label by clicking the add button, is there anyway that i can have a delete button as well so that when i select a check-box and press the delete button the check-box along with the text box is deleted??Please find my code below!!
<html>
<head>
<title></title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<script type="text/javascript">
function Add()
{
var checkbox=document.createElement('input');
var inps=document.createElement('input');
var output=document.getElementById('output');
checkbox.type='checkbox';
inps.type='text';
inps.name='textboxname';
checkbox.name='checkname';
output.appendChild(checkbox);
output.appendChild(inps);
output.appendChild(document.createElement('br'));
}
</script>
</head>
<body>
<form action="http://localhost:9990" method="post">
<span id="output"></span>
<input type="button" value="Add" onclick="Add()">
<center>
<p>
<input type="file" name="datafile" size="40">
</p>
<div>
<input type="submit" value="Send">
</div>
</center>
</form>
</body>
</html>
Give all of the check boxes that could potentially be deleted the same class. Additionally label all of the text boxes that could be deleted with their own class. My check boxes will be labeled with chk and my text boxes will be labeled with txt. As in:
<input type="checkbox" class = 'chk' /> and
<input type="text" class = 'txt' />
The following solution should work as long as check boxes and text fields are 1 to 1.
the function you will add to your delete button will loop through all of the check boxes and see if they are deleted and then delete the checked ones.
Heres the JS:
function delBoxes(){
var boxes = document.getElementsByClassName('chk');
var texts = document.getElementsByClassName('txt');
for(var i = 0; i<boxes.length; i++){
box = boxes[i];
txt = texts[i];
if(box.checked){
box.parentNode.removeChild(box);
txt.parentNode.removeChild(txt);
}
}
}
That will delete all of the checked check boxes, all you have to do now is make a button and add that function as an onclick.
<input type="button" value="Delete checked boxes" onclick = "delBoxes();" />
Sample HTML
<div>
<input type='checkbox' value='asd' id='test' name='test' />
<input type='checkbox' value='asd' id='tester' name='test' />
<input type='button' value='remove' id='rmvBtn' />
</div>
In pure javascript, you can do this,
var rmvBtn = document.getElementById('rmvBtn');
rmvBtn.addEventListener('click', function(){
var rmvCheckBoxes = document.getElementsByName('test');
for(var i = 0; i < rmvCheckBoxes.length; i++)
{
if(rmvCheckBoxes[i].checked)
{
removeElm(rmvCheckBoxes[i]);
}
}
});
function removeElm(elm){
elm.parentElement.removeChild(elm);
}
JS Fiddle
HTML
<input type="checkbox" id="checkboxid" name="checkboxname">
<button id="btnDeleteid" onclick="deleteCheckBox()" name="btnDeletename">Delete</button>
JavaScript
function deleteCheckBox(){
if (document.getElementById('checkboxid').checked){
var answer = confirm('Are you sure you want to delete this checkbox?');
if (answer)
{
$("#checkboxid").remove();
}
}else{
alert("Pls check the checkbox.");
}
}
I hope this will help.
Refer fiddle - http://jsfiddle.net/F8w8B/3/
I've seen all the posts but my problem isn't that it doesn't change the background color but rather that it does and the change it but to the original. Here's the code.
<html>
<head>
<title>Calculator</title>
<link rel="stylesheet" type="text/css" href="color.css"/>
<script type="text/javascript">
function calc(color){
//document.body.bgColor = color;
x=document.myForm
var val1=x.input1.value;
var val2=x.input2.value;
var val3=val1+"+"+val2;
if(eval(val3)<0) return;
else{
alert("The result is "+eval(val3));
var bd = document.getElementById ('body');
bd.className="highlight";
return;
}
}
</script>
</head>
<body id="body" onload="changeBackground(red)">
<form name="myForm" onsubmit="calc(this)">
Enter 2 values to add ;)
<input type="text" name="input1">
<input type="text" name="input2">
<input type="submit" value="Send Input">
</form>
</body>
</html>
CSS:
.hightlight{
background-color: yellow;
}
I understand that the function ends right before the end of the function. So how can I get it to hold the color?
The problem is that you tries to POST page over submit button. In this case page is fully redrawn, without keeping previous state that is set by your script.
Just change code of button:
<input type="button" value="Send Input" onclick="calc(this)">