I have written the below mentioned javascript and have called on the button click event but somehow it doesn't work, please someone help.
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
</head>
<script type="text/javascript">
function f1()
{
var x=document.getElementById("txt1").innerHTML
if(x==1)
{
alert("hello");
}
}
</script>
<body>
<form id="form1">
<input type="text" id="txt1"/><br/>
<input type="button" id="btn1" value="submit" onclick="f1()"/>
</form>
</body>
</html>
You're trying to grab innerHTML from an input field when you should be grabbing the value otherwise it'll always be undefined:
Change:
var x = document.getElementById("txt1").innerHTML;
to:
var x = document.getElementById("txt1").value;
JSFiddle Example
http://jsfiddle.net/moogs/dNWNP/1/
It should not be .innerHTML, but .value.
You should use value instead of innerHTML:
var x=document.getElementById("txt1").value;
See the jsfiddle.
Related
I am currently writing a function that writes a bit of code for me based on an input. I am currently working on creating the input and the code that pastes the input, but whenever it writes, it shows up as undefined. This is the code.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Javascript YAML Generator</title>
</head>
<body>
<form class="yamlform" action="index.html" method="post">
<input type="text" name="appname" value="Name">
<button type="submit" onclick="writeAppName()">Submit</button>
</form>
<script type="text/javascript">
var appname = document.getElementsByName("appname").value
function writeAppName() {
document.write(appname)
}
</script>
</body>
</html>
NOTE: This is not my final version of the code, at the moment I just want a system for writing an input value that I can duplicate. Final version will be using document.getElementbyID.
document.getElementsByName returns colection. Use document.getElementsByName("appname")[0].value.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Javascript YAML Generator</title>
</head>
<body>
<form class="yamlform" action="index.html" method="post">
<input type="text" name="appname" value="Name">
<button type="submit" onclick="writeAppName()">Submit</button>
</form>
<script type="text/javascript">
var appname = document.getElementsByName("appname")[0].value
function writeAppName() {
document.write(appname)
}
</script>
</body>
</html>
You need to refer to the first element with name "appname", because it could be a collection. Also I but the assignment for appanme variable inside of the function, this will make it so appname isn't being assigned to "Name" right away and is instead assigned to whatever is in the text box when you click the botton
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Javascript YAML Generator</title>
</head>
<body>
<form class="yamlform" action="index.html" method="post">
<input type="text" name="appname" value="Name">
<button type="submit" onclick="writeAppName()">Submit</button>
</form>
<script type="text/javascript">
function writeAppName() {
var appname = document.getElementsByName("appname")[0].value
document.write(appname)
}
</script>
</body>
</html>
The problem is with your document.getElementsByName
It is possible that multiple elements would have same name.
While using document.getElementsByName, there might be multiple elements instead of a single element present in DOM with similar name, so document.getElementsByName returns an array (a list of elements) and not a single element
To use different elements of the Array, use
document.getElementsByName("appname")[0] // For first element with name
document.getElementsByName("appname")[1] // For second element with name
// and so on
So in your code, you would use
var appname = document.getElementsByName("appname")[0].value;
What i want to do is that when i click on the button "1" it should display the number "1" in the textbox above it.
what is wrong with my jquery code?
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>JQuery Tutorial</title>
<link rel="stylesheet" type="text/css" href="css/style.css">
</head>
<body>
<input id="textbox" type="text" />
<div>
<input id="1" type="button" value="1" />
<input id="2" type="button" value="2" />
<input id="3" type="button" value="3" />
</div>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"> </script>
<script type="text/javascript" src="js/ext.js"></script>
</body>
My jquery
$('#1').click(function)({
var txt = $('#textbox');
$('#1').html('txt');
});
Try this code
$('input[type="button"]').click(function() {
var txt = $(this).val();
$('#textbox').val(txt);
});
Will explain your problem with your jQuery code:
Line 1:
You registered with #1 button so this will be triggered on when button 1 is click, I made it generalised
Line 2:
You are getting value from textbox, whereas you are supposed to take value from button text.
Line 3:
You are assigning value in button, whereas you are supposed to assign to textbox and always use val() for input type of control and html() for other html container controls
The above were your errors explained.
Queries welcomed!
Fiddle demo
$(function(){
$('input[type="button"]').click(function(){
$('#textbox').val($(this).val());
});
});
You have to get the value using val() method. Also, you are passing variable txt as string to the html() function which is wrong. Try the below...
var txt = $('#textbox').val();
$('#input1').html(txt);
Try this
$('input[type="button"]').click(function() {
$('#textbox').val($(this).val());
});
You can try this one
$('div').on('click', 'input', function () {
$('#textbox').val(this.value);
});
I am trying to get the user to put something into the text area and the output should be what he wrote repeapiting x amount of times, but I get an error "document.forme is undefined".
Can you please help me understand why it is undefined?
My code:
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>input home work</title>
<script type="text/javascript">
var help= document.forme.tryout.value;
for (x=1; x<=10;x++){
function numberCheak (){
document.write("this is"+" "+help++);
}
}
</script>
</head>
<body>
<form name="forme">
<input name="tryout" type="text" />
<input type="button" value="click me" onClick="numberCheak();"/>
</form>
</body>
</html>
Ok, you have a few problems. The first is that you are trying to access a form element that doesn't exist yet: the script is above the form element, so the form doesn't exist when you try to get it. If you move the script to the bottom of the page it will work better.
Second, the loop should be inside the function, not wrapped around the function.
Third, document.write has weird side effects and causes the document to be rewritten and will stop the script from continuing correctly.
Here's my revised script
function numberCheak() {
var help = document.forme.tryout.value;
for (var x = 1; x <= 10; x++) {
document.getElementById("output").innerHTML += help;
}
}
and the HTML form that goes with it
<form name="forme" id="forme">
<input name="tryout" type="text" />
<input type="button" value="click me" onclick="numberCheak();" />
<span id="output"></span>
</form>
You can see it in action on jsFiddle.
Forms are stored in collection and can be accessed like this:
var form = document.forms[i];
or
var form = document.forms[name];
In your case, i is 0 and name is forme.
I am trying to validate an html form using javascript the code is bellow
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title></title>
</head>
<body>
<script type="text/javascript">
function validate(){
if(document.form1.thbox.checked)
{
alert("yes");
}
else
alert("no");
}
</script>
<form name="form1" method="get">
<input type="checkbox" name="thebox"/>
<input type="button" value="press me" onclick="validate()"/>
</form>
</body>
</html>
when ever I try to press on button nothing works
Can someone please tell me why is that?
Thank you
Change if(document.form1.thbox.checked) to if(document.form1.thebox.checked) You have missed e in thebox
http://jsfiddle.net/eJhzf/
Perhaps because checked is not a valid property of undefined:
HTML:
name="thebox"
Javascript:
form1.thbox.checked
Notice the missing e, so, it should be:
form1.thebox.checked
use this method
if ( document.form1.thebox.checked == false )
{
alert ( "Please select check box." );
}
else {
// your code or message
}
and use thebox instead of thbox
In the following code , I have a javascript function and I am tring to change the backgroundColor of the page to a color passed in as a parameter. But my code doesn't work, can anybody help me what is wrong in my code?
HTML:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Changing Color</title>
<head>
<style type="text/css">
body {
background-color:#ffcccc;
}
</style>
</head>
<body>
<form>
<label>color: <input type="text" name="color"> </label>
<input name="color" type = "button" onClick = "changecolor(color.value) " value = "color">
</form>
</body>
</html>
Javascript:
function changecolor(colour)
{
document.bgcolor=colour;
}
Assuming colour contains a valid CSS color descriptor, you can write:
document.body.style.backgroundColor = colour;
you have to put the function in a script block.
...
</form>
<script type="text/javascript>
//function declaration
</script>
Try this code it works finely man .i have just tried it.you can use it where-ever you want.also appended the code for onmouse click and onmouseover.
<html>
<head>
<script language="javaScript">
function change_background(color){
document.bgColor = color;
}
</script>
</head>
<body>
<form>
<label>color: <input type="text" name="color" >
</label>
<input name="clrs" type ="button" value="getcolor" onClick = "change_background(color.value) " >
</form>
ClickBlue
Mouseoverblack
Mouseover white
</body>
</html>`