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How to only show a div if a certain entry field is filled in (but not submitted)?

Relatively new to html coding, and very new with javascript. On this page, I don't want the option to email an editor to become visible until a tripID is filled in (but form not submitted yet). Here is the form so far without that option added yet:
TripID:
<input type='text' id='atripid' name='atripid' size='6' maxlength='6' /><br><br>
Port:
<input type='text' id='aport' name='aport' size='6' maxlength='6' /><br><br>
<div id=acheckbox><br> E-mail editor? </b>
<input type='checkbox' name='acheck' onchange='copyTextValue(this);'/><br>
<div id='div' style='display:none'>
<br> <b>Subject:</b> <input type='text' id='asubject' name='asubject' size='70' maxlength='75'/><br><br>
<textarea name='aemailbody' cols='85' rows = '10'>Explain any packaging or labeling mistakes here...</textarea>
</div>
</div>
<script>
function copyTextValue(bf) {
if(bf.checked){
document.getElementById('div').style.display = 'block';
var atext = 'Frozen Sample Error Notice: '+ document.getElementById('atripid').value;
}else{
document.getElementById('div').style.display = 'none';
var atext = '';
}
document.getElementById('asubject').value = atext
}
</script>
</div>
Now to hide the email editor option until tripid is filled in, I got something like this to work on jfiddle:
<form action="">
tripid:<input type="atripid" id="atripid" value="">
port:<input type="aport" id="aport" value="">
</form>
<div id="acheckbox" style="display:none">
<br><br><br>
This is where the email options (subject and textbox) would appear.
</div>
<script>
$("#atripid").keyup(function(){
if($(this).val()) {
$("#acheckbox").show();
} else {
$("#acheckbox").hide();
}
});
</script>
But for some weird reason, it won't work anywhere else, so I can't figure out how to incorporate it into what I already have. Does anyone have any ideas that could help me? Thanks!

You can do something like this with pure javascript:
<input type="atripid" id="atripid" value="" onkeyup="keyupFunction()">
And define your keyupFunction().
See jsfiddle

The code you attempted on jsfiddle requires that you import jquery.js files. An alternate way of doung what you intend to do is
<input type='text' id='atripid' name='atripid' size='6' maxlength='6' onkeyup="toggleCheckBox(this)" />
<input type='checkbox' name='acheck' id="acheckbox" style="display:none;" onchange='copyTextValue(this);'/>
with js
function toggleCheckBox(element) {
if(element.value=='') {
document.getElementById('acheckbox').style.display = 'none';
}
else {
document.getElementById('acheckbox').style.display = 'block';
}
}

The issue is the .keyup() method, which is not consistent across browsers and does not account for other means of user input. You would rather, use an Immediately Invoked Function Expression (IIFE) that will detect the propertychange of the input field in question and then to fire the desired event if the condition is met. But for the purposes of simplicity, and the fact that I'm not as well versed enough in IIFE syntax, simply bind some events to the input field, like so:
$("#atripid").on("keyup change propertychange input paste", (function(e) {
if ($(this).val() === "") {
$("#acheckbox").hide();
} else {
$("#acheckbox").show();
}
}));
#acheckbox {
display: none;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<form action="">
tripid:
<input type="atripid" id="atripid" value="">port:
<input type="aport" id="aport" value="">
</form>
<div id="acheckbox">
<br>
<br>
<br>This is where the email options (subject and textbox) would appear.
</div>

Autofocus With Cursor On End Of Textbox

I want to put autofocus on a html textbox such that the cursor points to the end of some text already present in the textbox.
I know what the autofocus attribute does. And I have also seen put cursor at end of text input's value which answers how to put cursor at the end, But the textbox is not autofocussed upon page reload. How can I do both - autofocus the textbox upon page reload and put cursor to end of text ?
Code :
<textarea id="txtArea" style="width:106%; height:100px" align="center" name="task1" onkeypress="onTestChange();" onfocus="this.value = this.value;" autofocus ><?php echo $_GET["task"];?></textarea>
I want to put Cursor after the text echoed. It is not the value of the textarea.
Also the textbox I referred to is Textarea.

Please use this code and run in your browser
$(document).ready(function() {
var input = $("#test");
var len = input.val().length;
input[0].focus();
input[0].setSelectionRange(len, len);
});
<input type="text" id="test" autofocus value="value text" />

try to run this simple code and see u will notice that first text box will be focused and not the second
<input type="text" autofocus value="value text" onfocus="this.value = this.value;"/>
<input type="text" autofocus value="value text" onfocus="this.value = this.value;"/>

Something like this. Focus it, and set the value again.
<input type="text" value="this holds a value" id="element"/>
<script>
$(window).ready(function(){
$("#element").focus();
$("#element").val($("#element").val());
});
</script>

$( document ).ready(function() {
var t =$("#txtID");
t.focus().val(t.val());
});

Check chris G's answer on this question. Call function after you have set the focus to the textbox:
function SetCaretAtEnd(elem) {
var elemLen = elem.value.length;
// For IE Only
if (document.selection) {
// Set focus
elem.focus();
// Use IE Ranges
var oSel = document.selection.createRange();
// Reset position to 0 & then set at end
oSel.moveStart('character', -elemLen);
oSel.moveStart('character', elemLen);
oSel.moveEnd('character', 0);
oSel.select();
}
else if (elem.selectionStart || elem.selectionStart == '0') {
// Firefox/Chrome
elem.selectionStart = elemLen;
elem.selectionEnd = elemLen;
elem.focus();
} // if
} // SetCaretAtEnd()

The answer to your link already auto focused on page load.
<input type="text" autofocus value="value text" onfocus="this.value = this.value;"/>
JS Fiddle

Change Input to Upper Case

JS:
<script type="text/css">
$(function() {
$('#upper').keyup(function() {
this.value = this.value.toUpperCase();
});
});
</script>
HTML
<div id="search">
<input type="radio" name="table" class="table" value="professor" tabindex="1" /> Professor
<input type="radio" name="table" class="table" value="department" tabindex="2" /> Department
<input type="radio" name="table" id="upper" class="table" value="course" tabindex="3" /> Course
<input type="text" name="search" class="keywords" value="Select an option..." onclick="this.value='';" onfocus="this.select()" onblur="this.value=!this.value?':this.value;" tabindex="4" />
<div id="content"> </div>
</div>
Why is this still not working?? Just trying to call div ".keywords" from JS.

I think the most elegant way is without any javascript but with css. You can use text-transform: uppercase (this is inline just for the idea):
<input id="yourid" style="text-transform: uppercase" type="text" />
Edit:
So, in your case, if you want keywords to be uppercase change:
keywords: $(".keywords").val(), to $(".keywords").val().toUpperCase(),

Javascript string objects have a toLocaleUpperCase() function that makes the conversion itself easy.
Here's an example of live capitalisation:
$(function() {
$('input').keyup(function() {
this.value = this.value.toLocaleUpperCase();
});
});
Unfortunately, this resets the textbox contents completely, so the user's caret position (if not "the end of the textbox") is lost.
You can hack this back in, though, with some browser-switching magic:
// Thanks http://blog.vishalon.net/index.php/javascript-getting-and-setting-caret-position-in-textarea/
function getCaretPosition(ctrl) {
var CaretPos = 0; // IE Support
if (document.selection) {
ctrl.focus();
var Sel = document.selection.createRange();
Sel.moveStart('character', -ctrl.value.length);
CaretPos = Sel.text.length;
}
// Firefox support
else if (ctrl.selectionStart || ctrl.selectionStart == '0') {
CaretPos = ctrl.selectionStart;
}
return CaretPos;
}
function setCaretPosition(ctrl, pos) {
if (ctrl.setSelectionRange) {
ctrl.focus();
ctrl.setSelectionRange(pos,pos);
}
else if (ctrl.createTextRange) {
var range = ctrl.createTextRange();
range.collapse(true);
range.moveEnd('character', pos);
range.moveStart('character', pos);
range.select();
}
}
// The real work
$(function() {
$('input').keyup(function() {
// Remember original caret position
var caretPosition = getCaretPosition(this);
// Uppercase-ize contents
this.value = this.value.toLocaleUpperCase();
// Reset caret position
// (we ignore selection length, as typing deselects anyway)
setCaretPosition(this, caretPosition);
});
});
Ultimately, it might be easiest to fake it. Set the style text-transform: uppercase on the textbox so that it appears uppercase to the user, then in your Javascript apply the text transformation once whenever the user's caret focus leaves the textbox entirely:
HTML:
<input type="text" name="keywords" class="uppercase" />
CSS:
input.uppercase { text-transform: uppercase; }
Javascript:
$(function() {
$('input').focusout(function() {
// Uppercase-ize contents
this.value = this.value.toLocaleUpperCase();
});
});
Hope this helps.

If you purpose it to a html input,
you can easily do this without the use of JavaScript! or any other JS libraries.
It would be standard and very easy to use a CSS tag text-transform:
<input type="text" style="text-transform: uppercase" >
or you can use a bootstrap class named as "text-uppercase"
<input type="text" class="text-uppercase" >
In this manner, your code is much simpler!

Solutions using value.toUpperCase seem to have the problem that typing text into the field resets the cursor position to the end of the text. Solutions using text-transform seem to have the problem that the text submitted to the server is still potentially lowercase. This solution avoids those problems:
function handleInput(e) {
var ss = e.target.selectionStart;
var se = e.target.selectionEnd;
e.target.value = e.target.value.toUpperCase();
e.target.selectionStart = ss;
e.target.selectionEnd = se;
}
<input type="text" id="txtTest" oninput="handleInput(event)" />

Can also do it this way but other ways seem better, this comes in handy if you only need it the once.
onkeyup="this.value = this.value.toUpperCase();"

try:
$('#search input.keywords').bind('change', function(){
//this.value.toUpperCase();
//EDIT: As Mike Samuel suggested, this will be more appropriate for the job
this.value = this.value.toLocaleUpperCase();
} );

I think the most easiest way to do is by using Bootstrap's class ".text-uppercase"
<input type="text" class="text-uppercase" />

I couldn't find the text-uppercase in Bootstrap referred to in one of the answers. No matter, I created it;
.text-uppercase {
text-transform: uppercase;
}
This displays text in uppercase, but the underlying data is not transformed in this way.
So in jquery I have;
$(".text-uppercase").keyup(function () {
this.value = this.value.toLocaleUpperCase();
});
This will change the underlying data wherever you use the text-uppercase class.

onBlur="javascript:{this.value = this.value.toUpperCase(); }
will change uppercase easily.
Demo Here

This answer has a problem:
style="text-transform: uppercase"
it also converts the place holder word to upper case which is inconvenient
placeholder="first name"
when rendering the input, it writes "first name" placeholder as uppercase
FIRST NAME
so i wrote something better:
onkeypress="this.value = this.value + event.key.toUpperCase(); return false;"
it works good!, but it has some side effects if your javascript code is complex,
hope it helps somebody to give him/her an idea to develop a better solution.

Here we use onkeyup event in input field which triggered when the user releases a Key. And here we change our value to uppercase by toUpperCase() function.
Note that, text-transform="Uppercase" will only change the text in style. but not it's value. So,In order to change value, Use this inline code that will show as well as change the value
<input id="test-input" type="" name="" onkeyup="this.value = this.value.toUpperCase();">
Here is the code snippet that proved the value is change
<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<form method="get" action="">
<input id="test-input" type="" name="" onkeyup="this.value = this.value.toUpperCase();">
<input type="button" name="" value="Submit" onclick="checking()">
</form>
<script type="text/javascript">
function checking(argument) {
// body...
var x = document.getElementById("test-input").value
alert(x);
}
</script>
</body>
</html>

<input id="name" data-upper type="text"/>
<input id="middle" data-upper type="text"/>
<input id="sur" data-upper type="text"/>
Upper the text on dynamically created element which has attribute
upper and when keyup action happens
$(document.body).on('keyup', '[data-upper]', function toUpper() {
this.value = this.value.toUpperCase();
});

**JAVA SCRIPT**
<html>
<body>
<script>
function #ToCaps(obj)
{
obj.value=obj.value.toUpperCase();
}
</script>
<input type="text" onkeyup=#ToCaps(this)"/>
</body>
</html>
**ASP.NET**
Use a css style on the text box, write css like this:
.ToCaps { text-transform: uppercase; }
<asp:TextBox ID="TextBox1" runat="server" CssClass="ToCaps"></asp:Te writxtBox>
**OR**
simply write this code in textbox
<asp:TextBox ID="TextBox1" runat="server" style="text-transform:uppercase"></asp:TextBox>
**1.Note you don't get intelligence until you type up to style="**

Javascript has a toUpperCase() method. http://www.w3schools.com/jsref/jsref_toUpperCase.asp
So wherever you think best to put it in your code, you would have to do something like
$(".keywords").val().toUpperCase()

you can try this
HTML
<input id="pan" onkeyup="inUpper()" />
javaScript
function _( x ) {
return document.getElementById( x );
}
// convert text in upper case
function inUpper() {
_('pan').value = _('pan').value.toUpperCase();
}

retrieving text field value using javascript

I want to retrieve textfield value using javascript. suppose i have a code like:
<input type='text' name='txt'>
And I want to retrieve it using javascript. I call a function when a button is clicked:
<input type='button' onclick='retrieve(txt)'>
What coding will the retrieve function consist of?

You can do this:
Markup:
<input type="text" name="txt" id="txt"/>
<input type="button" onclick="retrieve('txt');"/>
JavaScript:
function retrieve(id) {
var txtbox = document.getElementById(id);
var value = txtbox.value;
}

Let's say you have an input on your page with an id of input1, like this:
<input type="text" id="input1" />
You first need to get the element, and if you know the Id, you can use document.getElementById('input1'). Then, just call .value to get the value of the input box:
var value = document.getElementById('input1').value;
Update
Based on your markup, I would suggest specifying an id for your text box. Incase you don't have control over the markup, you can use document.getElementsByName, like so:
var value = document.getElementsByName('txt')[0].value;

One of the way is already explained by Andrew Hare.
You can also do it by entering the value in the textbox and getting a prompt box with entered message when a user click the button.
Let's say, you have a textbox and a input button
<input type="text" name="myText" size="20" />
<input type="button" value="Alert Text" onclick="retrieve()" />
The function for retrieve()
function retrieve()
{
var text = document.simpleForm.myText.value;
alert(text);
}

How to show/hide input value on focus?

I see this all over the web, but was wondering if anyone has the JavaScript code for the EASIEST way to show input value on blur, but hide in on focus.

This always worked for me:
<input
type="text"
value="Name:"
name="visitors_name"
onblur="if(value=='') value = 'Name:'"
onfocus="if(value=='Name:') value = ''"
/>

Since this still comes up on google, I'd like to point out that with HTML 5 you can use the placeholder attribute with an input to achieve this in one piece of html.
<input type="text" id="myinput" placeholder="search..." />
Placeholder is now standard across modern browsers, so this really would be the preferred method.

I prefer jQuery way:
$(function(){
/* Hide form input values on focus*/
$('input:text').each(function(){
var txtval = $(this).val();
$(this).focus(function(){
if($(this).val() == txtval){
$(this).val('')
}
});
$(this).blur(function(){
if($(this).val() == ""){
$(this).val(txtval);
}
});
});
});
It is modified Hide Form Input Values On Focus With jQuery by Zack Perdue.

The simplest approach I know of is the following:
<input
name="tb"
type="text"
value="some text"
onblur="if (this.value=='') this.value = 'some text'"
onfocus="if (this.value=='some text') this.value = ''" />

If you don’t care about valid HTML, you use the placeholder attribute. It will work out of the box on a Safari, and you can add some unobtrusive JS to mimic this behavior in other browsers.
More reading:
http://www.beyondstandards.com/archives/input-placeholders/ (JS implementation)
http://lab.dotjay.co.uk/experiments/forms/input-placeholder-text/
And google. ;-)
The solution is similar to the one Josh Stodola posted, but it’s more flexible and universal.

This is what I use on my blog. Just go there and check out the source code behind.
function displaySearchText(text){
var searchField = document.getElementById('searchField');
if(searchField != null)
searchField.value = text;
}
Your input field should look something like this:
<input id='searchField' name='q' onblur='displaySearchText("Search...");' onfocus='displaySearchText("");' onkeydown='performSearch(e);' type='text' value='Search...'/>

For all browsers:
<input onfocus="if(this.value == 'Your value') { this.value = '';}" onblur="if(this.value == '') { this.value = 'Your value';}" value="Your value" type="text" name="inputname" />
For newest version of browsers:
<input type="text" name="inputname" placeholder="Your value" />