<head>
<script type="javascript">
function display()
{
document.getElementById("textField1").value = "abc";
}
</script>
</head>
<body>
<form id="form1" action="http://google.com">
<input id="textField1" type="text" value="0" align="right" size="13"/><br>
<input id="button1" type="button" value="1" onclick="display()">
</form>
</body>
but the value of textfield is not changing.
Any Ideas what am i doing wrong ??
try
<script type="text/javascript">
instead of
<script type="javascript">
. I believe the latter is not a valid syntax.
Removing the type attribute entirely works as well:
<script>
Your line
document.getElementById("textField1").value = "abc";
is correct, try
<head>
<script>
function display() {
document.getElementById("textField1").value = "abc";
}
</script>
</head>
<body>
<form id="form1" action="http://google.com">
<input id="textField1" type="text" size="13" value="clear" /><br>
<input type="button" onclick="display()">
</form>
</body>
Remove the type from your script tag. It's incorrect and making the browser not treat the script contents as JavaScript. Here it is not working, and here it is working (with the type="javascript" removed).
It has to be
<script type="text/javascript">
function display()
{
document.getElementById("textField1").value = "abc";
}
</script>
and not
<script type="javascript">
function display()
{
document.getElementById("textField1").value = "abc";
}
</script>
In case the text field is not having id attribute and having name attribute then,
use
document.getElementsByName("name")[0].value="ert";
getElementsByName() returns an array of objects with that specific name,that's why we are using the index 0.
There is nothing wrong with your code, it works fine in this fiddle.
I only speculate, but you could try to either delete the type attribute of the script-tag, or change it to type="text/javascript" which would be the proper type to use. If you don't specify it, the browser will consider it as JavaScript by default.
It's actually correct, but if it doesn't work try like this:
document.getElementById("textfield1").innerHtml = "ABC";
Related
Please check my code below. I want to display input characters number real time using jquery javascript. But problem is when i am doing it with "textarea" it works but when i do same with normal input type text its not work.
<!DOCTYPE html>
<html>
<head>
<title>Test</title>
<script src="http://code.jquery.com/jquery-1.11.1.js" type="text/javascript"></script>
</head>
<body>
<!-- Works -->
<!-- <textarea></textarea>
<span id="characters"><span>
<script type='text/javascript'>
$('textarea').keyup(updateCount);
$('textarea').keydown(updateCount);
function updateCount() {
var cs = $(this).val().length;
$('#characters').text(cs);
}
</script> -->
<!-- Not works -->
<input type="text" name="name">
<span id="characters"><span>
<script type='text/javascript'>
$('text').keyup(updateCount);
$('text').keydown(updateCount);
function updateCount() {
var cs = $(this).val().length;
$('#characters').text(cs);
}
</script>
</body>
</html>
Here is a working fiddle with combining your two events keyup and keydown into one line :-)
Your selector was wrong, text doesn't exist. So I call input[name="name"] instead to get the input by your name value:
$('input[name="name"]').on('keyup keydown', updateCount);
function updateCount() {
$('#characters').text($(this).val().length);
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="text" name="name">
<span id="characters"><span>
$("input").keyup(function(){
$("#characters").text($(this).val().length);
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="text" name="name">
<span id="characters"><span>
With "textarea" version you are selecting "textarea" by $('textarea').keyup(updateCount) and
$('textarea').keydown(updateCount) nicely but with text input you are doing wrong to select input text.
I have fix it by placing a id called "foo" on input text. This should be working now.
<script src="http://code.jquery.com/jquery-1.11.1.js" type="text/javascript"></script>
<input type="text" id="foo" name="">
<span id="characters"><span>
<script type='text/javascript'>
$('#foo').keyup(updateCount);
$('#foo').keydown(updateCount);
function updateCount() {
var cs = $(this).val().length;
$('#characters').text(cs);
}
</script>
If you want to get an input with the type text you must use a selector like this
$('input[type="text"]').keyup(updateCount);
$('input[type="text"]').keydown(updateCount);
Here is a list of all jQuery selectors
You are not selecting the input field here.
Try the following
$('input').keyup(updateCount);
$('input').keydown(updateCount);
Here you go with a solution https://jsfiddle.net/mLb41vpo/
$('input[type="text"]').keyup(updateCount);
function updateCount() {
var cs = $(this).val().length;
$('#characters').text(cs);
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<input type="text" name="">
<span id="characters"><span>
Mistake was $('text').keyup(updateCount);, you can refer input textbox using 'text'.
It should be $('input').keyup(updateCount);
Everything is correct in your code, you just need to add ":" beore your type. This will make it identify, it is input type.
Example:
<script type='text/javascript'>
$(':text').keyup(updateCount);
$(':text').keydown(updateCount);
function updateCount() {
var cs = $(this).val().length;
$('#characters').text(cs);
}
</script>
I changed your script only. Just find the change, you will get it.
I have 2 php pages
home.php
about.php
I have 1 Javascript page, which I called javascript from home.php.
I want to access the value of the p tag in about.php.
home.php
<!DOCTYPE html>
<html>
<body>
<input type="submit" onclick='myfunction()'>
</body>
</html>
javascript
<script>
function myfunction()
{
}
</script>
about.php
<!DOCTYPE html>
<html>
<head lang="en">
</head>
<body>
<p id='demo'>i want to access this value in javascript function</p>.
</body>
</html>
You probably want something in pure javascript like:
<script>
document.getElementById('demo').innerHTML='change the p tag value';
</script>
function myfunction(){
var val= document.getElementById('demo').textContent;
alert(val);
}
FIDDLE
var pTag = document.getElementById('demo').innerHTML;
The variable pTag will now hold the value(text) of your "demo" tag,
ready for you to do what you wish with it.
EDIT:
Using Javascript, set the value of a hidden form field when you change the contents of your tag.
Then pass the values using php, like below...
home.php:
<form action="about.php">
<input type="hidden" name="demo" id="demo" />
<p id="pDemo"> </p>
<button type="submit"></button>
</form>
Then in about.php:
<p id='demo'>
<?php
$demo= $_GET['demo'];
//use your variable "demo'
?>
</p>
This link should help, here.
You can use ajax or you can use load of jquery.
<script>
$(document).ready(function() {
$("#bAdd").load("about.php",function(response,status,xhr){// use if less data to load
var pTag = document.getElementById('demo').innerHTML;
alert(pTag);
});
});
</script>
<input type="hidden" id="bAdd" value="">
<body>
<script type="text/javascript">
var a="sreedhar";
<input type="text" value="abc">
</script>
</body>
It gives the syntax error.
can't we use "html tags" directly in "javascript".
No, you can't use them directly in JavaScript.
However you may treat them as strings:
var str = '<input type="text" value="abc">';
or as DOM elements:
var input = document.createElement('input');
input.type = 'text';
input.value = 'abc';
And then append to the markup, e.g. document.body.appendChild(input);.
Usually a well formated hmtl with javascript looks like this.
<HTML>
<HEAD>
<script type="text/javascript">
var a="sreedhar";
</script>
</HEAD>
<BODY>
<input type="text" value="abc">
</BODY>
</HTML>
If you want to generate some html with javascript then assign it as a string to some variable.
For example you have a div having id='abc' and you want to generate a textbox in this div then you need to do like this
<script type="text/javascript">
var textbox = '<input type="text" value="abc">';
$('#abc').append(textbox);
</script>
Maybe you want this:
<script type="text/javascript">
var a="sreedhar";
document.write('<input type="text" value="abc">');
</script>
</BODY>
<html>
<head>
<title> New Document </title>
<script type="text/javascript">
//put javascript function here
</script>
</head>
<body>
<input type="text" value="abc">
</body>
</html>
You can use html element inside the javascript using element id.
I just started learning JavaScript and am wondering why this simple snippet hangs when I click on the "Call function" button. What am I missing?
<html>
<head>
<script type="text/javascript">
function myfunction()
{
document.write("hello");
}
</script>
</head>
<body>
<form>
<input type="button"
onclick="myfunction()"
value="Call function">
</form>
</body>
</html>
You need to write inside an element or give an element a value, or you should use document write like that :
<html>
<head>
<script type="text/javascript">
function myfunction()
{
document.getElementById("lblMessage").innerText = "hello";
document.getElementById("txtMessage").value = "hello";
//document.write("hello");
}
</script>
</head>
<body>
<form>
<script type="text/javascript">
document.write("This is written while page processed by browser !<br />");
</script>
<input type="text" id="txtMessage" /><br />
<span id="lblMessage"></span><br />
<input type="button"
onclick="myfunction()"
value="Call function">
</form>
</body>
</html>
If you simply want to see your button doing something then try:
alert("Hello");
instead of the document.write.
Where do you expect the function to output its "hello"? Right into the button's source code? That makes no sense. The browser is confused and hangs.
Document.write doesn't magically insert something at the end of your document. It writes its stuff out right there where it is called.
Not too sure what you mean by "hang"... Try this out... The alerts can be removed, but will inform you of where it is at in execution...
<html>
<head>
<script type="text/javascript">
function myFunction() {
//for debugging
alert('Made it into function');
document.getElementById('MyOutputDiv').innerHTML = 'Word To Your Mom...';
//for debugging
alert('function complete');
}
</script>
</head>
<body>
<input type='button' onclick='myFunction();' value='Call Function'>
<br>
<div id='MyOutputDiv'></div>
</body>
</html>
document.write, but where? You have to specify this.
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Hello</title>
</head>
<body>
<pre><script type="text/javascript">
function myfunction() {
d = document.getElementById('hello');
d.style.display = "block";
d = document.getElementById('callme');
d.style.display = "none";
}
</script>
</pre>
<div id="hello" style="display:none">
Hello
</div>
<div id="callme">
<input type="button"
onclick="myfunction()"
value="Call function">
</input>
</div>
</body>
</html>
I can't explain the "hang" but please take a look at this page for a primer on document.write: http://javascript.about.com/library/blwrite.htm I would also like to second that you probably want to write to a specific element in the page rather than just overwriting the entire page.
<script type="text/javascript">
var p = s.getMaximum();
</script>
<form action="/cgi-bin/Lib.exe" method="POST" name="checks" ID="Form1">
<INPUT TYPE="text" NAME="inputbox" VALUE="VAR P FROM JAVA SCRIPT HERE?" ID="Text1"><P></form>
Possible to pass the javascript value 'p' as the value of input form?
Thanks.
You can use javascript to set the value of that element to p.
<script type="text/javascript">
document.getElementById("Text1").value = p;
</script>
document.getElementById('Text1').value = p;
You want to read about the Javascript DOM.
Start with the following:
http://www.w3schools.com/htmldom/dom_obj_form.asp
Specifically you're looking to manipulate document.checks.inputbox.value
Edit: Page removed. Answer can be found here now:
http://www.w3schools.com/jsref/coll_doc_forms.asp
Using Javascript:
<script type="text/javascript">
document.getElementById("Text1").value = p;
</script>
Using jQuery:
<script type="text/javascript">
$("#Text1").val(p);
</script>