Javascript needed for form reset button - javascript

I have a form with a text area as well as javascript counter that counts how many characters you type into the text area. I need a button that resets both whats typed into the text area AND the counter.
This is my form code:
<script type="text/javascript">
function change (el) {
var max_len = el.name == 'left' ? 60 : 320;
if (el.value.length > max_len) {
el.value = el.value.substr(0, max_len);
}
document.getElementById(el.name + '_char_cnt').innerHTML = el.value.length;
document.getElementById(el.name + '_chars_left').innerHTML = max_len -
el.value.length;
return true;
}
</script>
<h2 style="background-color: #eee; padding: 10px 20px 10px 20px; margin-
bottom: 20px;">Enter meta title tag</h2>
<form id="title">
<textarea style="border: 1px solid #eb008b;" cols="100" name="left"
rows="2" maxLength="60" onkeyup="change(this);"></textarea>You've typed <span id="left_char_cnt"><b>0</b></span>
character(s) out of a possible 60. You are allowed <span
id="left_chars_left"><b>lots</b></span> more
<input class="btn btn-primary" type="button" value="reset title" />
</form>
The javascript below resets the text entered into the textarea but it does not reset the counter within the span "left_char_cnt"
<script>
function myFunction() {
document.getElementById("title").reset();
}
</script>
What javascript is needed to reset both?

You cannot "reset" the text / HTML of an element if you haven't saved it somehow. reset() only works for form inputs.
So what you have to do is rewrite the HTML content of your element.
<script>
function myFunction() {
document.getElementById("title").reset();
document.getElementById("left_char_cnt").innerHTML = '<b>0</b>';
}
</script>

your script to count words in text is not working but, i made a script to clear textarea & count
function myfun(){
document.getElementById('txtarea').value=' ';
document.getElementById('count').innerHTML='0';
}
<form id="title">
<textarea id="txtarea" style="border: 1px solid #eb008b;" cols="100" name="left"
rows="2"></textarea>You've typed <span id="left_char_cnt"><b id=count>123</b></span>
character(s) out of a possible 60. You are allowed <span
id="left_chars_left"><b >lots</b></span> more
<input class="btn btn-primary" type="button" onclick="myfun()" value="reset title" />
</form>
<script type="text/javascript">
function change (el) {
var max_len = el.name == 'left' ? 60 : 320;
if (el.value.length > max_len) {
el.value = el.value.substr(0, max_len);
}
document.getElementById(el.name + '_char_cnt').innerHTML = el.value.length;
document.getElementById(el.name + '_chars_left').innerHTML = max_len -
el.value.length;
return true;
}
</script>

The simplest way is to reuse the code you already have, and allow the change event handler to set the values correctly. That way, if you ever change the behavior of that function then the reset will also change to match it.
I also modified your code slightly to make it update as the text is changing, rather than when you leave the textarea.
Try this...
function change (el) {
var max_len = el.name == 'left' ? 60 : 320;
if (el.value.length > max_len) {
el.value = el.value.substr(0, max_len);
}
document.getElementById(el.name + '_char_cnt').innerHTML = el.value.length;
document.getElementById(el.name + '_chars_left').innerHTML = max_len - el.value.length;
return true;
}
var textarea = document.querySelector("#title textarea");
textarea.addEventListener("keyup", function() { change(this); });
document.querySelector("#reset-button").addEventListener("click", function() {
textarea.value = "";
change(textarea);
});
<h2 style="background-color: #eee; padding: 10px 20px 10px 20px; margin-
bottom: 20px;">Enter meta title tag</h2>
<form id="title">
<textarea style="border: 1px solid #eb008b;" cols="100" name="left"
rows="2"></textarea>You've typed <span id="left_char_cnt"><b>0</b></span>
character(s) out of a possible 60. You are allowed <span
id="left_chars_left"><b>lots</b></span> more
<input class="btn btn-primary" type="button" id="reset-button" value="reset title" />
</form>

var t = document.getElementsByTagName('textarea')[0];
var a = document.getElementById('left_char_cnt');
var b = document.getElementById('left_chars_left')
t.addEventListener('keyup',function(){
var value = t.value.length;
var maxval = 60;
a.innerHTML = value
b.innerHTML = (maxval- value)
if(value == 60){ a.maxLength = maxval}
})
function resetVal(){
t.value = null;
a.innerHTML = '<b>0</b>'
b.innerHTML = '<b>lots</b>'
}
<h2 style="background-color: #eee; padding: 10px 20px 10px 20px; margin-
bottom: 20px;">Enter meta title tag</h2>
<form id="title">
<textarea style="border: 1px solid #eb008b;" cols="100" name="left"
rows="2" maxlength="60"></textarea>You've typed <span id="left_char_cnt"><b>0</b></span>
character(s) out of a possible 60. You are allowed <span
id="left_chars_left"><b>lots</b></span> more
<input class="btn btn-primary" type="button" onclick='resetVal()' value="reset title"/>
</form>

Use this function, by replacing your 'myFunction()'
<script>
function myFunction() {
document.getElementById("title").reset(); // reset your form
document.getElementById("left_char_cnt").innerHTML = '<b>0</b>'; //reset your span counter
}
</script>

Related

Adding labels to QR codes

I have created a QR code generator. The user can create multiple QR codes.
I would like the user to be able to name each QR code (referred to as a checkpoint) by writing the desired checkpoint name in the text input field, clicking the Assign Name button and having the text input field disappear, being replaced by the name the user typed into the field.
The user can input checkpoint names, however, it only works for the first QR code printed, and the label only appears below the QR code. Below is the code that I have so far. Any help or suggestions to help me get the ball rolling on this would be very much appreciated. Thank you!
Note: If you try to run this to see the QR codes, you will have to enter something in the text field and press generate. They won't appear automatically.
<!DOCTYPE html>
<html>
<head>
<style>
body {
font-family: arial, sans-serif;
}
section {
margin: 50px auto;
max-width: 350px;
text-align: center;
}
textarea {
width: 50%;
height: 50px;
margin-bottom: 10px;
}
#size {
max-width: 64px;
}
label {
display: inline-block;
width: 140px;
text-align: left;
}
</style>
<script src="/scripts/snippet-javascript-console.min.js?v=1"></script>
</head>
<body>
<section>
<h1>QR Code Generator</h1>
<p>Enter a URL or some text bellow and hit the Generate button (<kbd>Ctrl</kbd>+<kbd>Enter</kbd>)!</p>
<textarea id="textarea" autofocus></textarea>
<div class="block">
<label for="size">Size (px):</label>
<input align="left" id="size" type="number" value="150" min="50" max="500" step="50">
<label for="amount">Amount of Labels:</label>
<input align="left" id="amount" type="number" value="1" min="1" max="500" step="1">
<button id="genQRcode">Generate</button>
</div>
<div id="content" style="display: none;"></div>
</section>
<p id="demo" align="center"></p>
<script>
function myFunction() {
var x = document.getElementById("cpname").value;
document.getElementById("demo").innerHTML = x;
}
</script>
<script id="template-qr-code" type="text/html">
<p> <img id="qrcode" src="{{src}}" /></p>
<label for="checkpoint"> Checkpoint Name:</label>
<input id="cpname" type="text" value="">
<button onclick="myFunction()">Assign Name</button>
</script>
<script type="text/javascript">
window.addEventListener('load', function() {
var textarea = document.getElementById("textarea"),
content = document.getElementById("content"),
amount = document.getElementById("amount"),
qrTemplate = document.getElementById('template-qr-code');
function genQRcode() {
var data = encodeURIComponent(textarea.value),
size = document.getElementById("size").value,
chart = "http://chart.googleapis.com/chart?cht=qr&chs=" + size + "x" + size + "&choe=UTF-8&chld=L|0&chl=" + data;
if (data === "") {
alert("Please enter valid data!");
textarea.focus();
content.style.display = "none";
} else {
for (var i = 0; i < amount.value; i++) {
var qrSrc = qrTemplate.innerHTML;
qrSrc = qrSrc.replace(new RegExp('{{src}}', 'g'), chart);
qrSrc = qrSrc.replace(new RegExp('{{i}}', 'g'), i);
content.insertAdjacentHTML('beforeEnd', qrSrc);
}
content.style.display = "";
}
}
document.getElementById("genQRcode").addEventListener("click", genQRcode);
document.addEventListener("keydown", function(e) {
if (e.ctrlKey && e.keyCode == 13) {
genQRcode();
}
});
});
</script>
</body>
</html>
Your click function
function myFunction() {
var x = document.getElementById("cpname").value;
document.getElementById("demo").innerHTML = x;
}
is getting and setting an element by ID. That will only ever affect a single element on the page (usually the first one that the browser runs into with that specific id). You need to use a different selector / way of getting the label you want to change because you can't reuse ids.
Basically you need to make your label fields distinct so you can actually select them

Getting two javascripts working on the same page

I found a script along with some HTML that counts the amount of characters you type into a box:
<script type="text/javascript">
function change (el) {
var max_len = 50;
if (el.value.length > max_len) {
el.value = el.value.substr(0, max_len);
}
document.getElementById('char_cnt').innerHTML = el.value.length;
document.getElementById('chars_left').innerHTML = max_len - el.value.length;
return true;
}
</script>`
<form>
<textarea style="border: 1px solid #eb008b;" cols=100 rows=2
onkeyup="change(this);"></textarea>
<p>You've typed <span id="char_cnt">0</span> character(s)</p>
<p>You are allowed <span id="chars_left">lots</span> more</p>
</form>
In this example, it counts up to 50 characters.
I want to add a second form on the same page that counts up to 200 characters. When I duplicate the code it stops one script working.
How do I add it so both scripts work on the same page?
Why exactly are you setting up a second JS function?
You could easily determine which form is getting worked in when you trigger them by id or name attribute.
Try something like this:
<!DOCTYPE html>
<html>
<body>
<script type="text/javascript">
function change (el) {
if (el.value.length > el.maxLength) {
el.value = el.value.substr(0, el.maxLength);
}
document.getElementById(el.name + '_char_cnt').innerHTML = el.value.length;
document.getElementById(el.name + '_chars_left').innerHTML = el.maxLength - el.value.length;
return true;
}
</script>
<form>
<!-- Left Textarea -->
<textarea name="left" style="border: 1px solid #eb008b;" cols=100 rows=2 maxLength=50 onkeyup="change(this);"></textarea>
<p>You've typed <span id="left_char_cnt">0</span> character(s)</p>
<p>You are allowed <span id="left_chars_left">lots</span> more</p>
<!-- Right Textarea -->
<textarea name="right" style="border: 1px solid #eb008b;" cols=100 rows=2 maxLength=200 onkeyup="change(this);"></textarea>
<p>You've typed <span id="right_char_cnt">0</span> character(s)</p>
<p>You are allowed <span id="right_chars_left">lots</span> more</p>
</form>
</body>
</html>
You are probably duplicating id attributes when you copy your form code. document.getElementById() will only get the first instance of something with the id specified.
Try something like this instead:
const MAX_LEN = 50;
Array.from(document.querySelectorAll("form")).forEach(form => {
const ta = form.querySelector("textarea"),
cc = form.querySelector("span.char_count"),
cl = form.querySelector("span.chars_left");
ta.addEventListener("keydown", () => {
if (ta.value.length > MAX_LEN) {
ta.value = ta.value.substr(0, MAX_LEN);
}
cc.innerHTML = ta.value.length;
cl.innerHTML = MAX_LEN - ta.value.length;
});
});
<form>
<textarea style="border: 1px solid #eb008b;" cols=100 rows=2></textarea>
<p>You've typed <span class="char_count">0</span> character(s)</p>
<p>You are allowed <span class="chars_left">lots</span> more</p>
</form>
<form>
<textarea style="border: 1px solid #eb008b;" cols=100 rows=2></textarea>
<p>You've typed <span class="char_count">0</span> character(s)</p>
<p>You are allowed <span class="chars_left">lots</span> more</p>
</form>

Javascript: Getting ASCII code of last character in textarea

In my javascript program I am trying to display ASCII code of last character of TextArea. For that I am getting value of textArea, getting last character of text area and using charCodeAt(139) to get the code of last character but it's not working. Can anyone tell me what's wrong in my code.
code:
<!doctype html>
<html>
<head>
<meta charset=utf-8>
<title>signature</title>
<style>
#key{
color: #ffffff;
font-size: 20px;
text-align: center;
}
</style>
</head>
<body bgcolor="#3d382a">
<h2 style="color: #ffffff; text-align: center;"> MY MESSAGE </h2>
<form action="#" method="post">
<p style="text-align: center; color: #ffffff; font-size: 20px">
<textarea id="textarea" name="text" maxlength="140" rows="15" cols="40" ></textarea><br><br>
<span id="count"></span> characters</p><br>
<p id="key"> </p>
</form>
<script>
var el_t = document.getElementById('textarea');
var length = el_t.getAttribute("maxlength");
var el_c = document.getElementById('count');
el_c.innerHTML = length;
el_t.onkeyup = function () {
document.getElementById('count').innerHTML = (length - this.value.length) ;
var str = document.getElementById('textarea').value;
var lastChar = str.charAt(str.length - 1);
document.getElementById('key').innerHTML = "Last key in ASCII code: " + lastChar;
};
</script>
</body>
</html>
Change your last line. Right now you just are logging the last character, whilst you need to get the ASCII code.
document.getElementById('key').innerHTML = "Last key in ASCII code: " + lastChar.charCodeAt(0);
var el_t = document.getElementById('textarea');
var length = el_t.getAttribute("maxlength");
var el_c = document.getElementById('count');
el_c.innerHTML = length;
el_t.onkeyup = function () {
document.getElementById('count').innerHTML = (length - this.value.length) ;
var str = document.getElementById('textarea').value;
var lastChar = str.charAt(str.length - 1);
document.getElementById('key').innerHTML = "Last key in ASCII code: " + lastChar.charCodeAt(0);
};
<h2 style="color: #ffffff; text-align: center;"> MY MESSAGE </h2>
<form action="#" method="post">
<p style="text-align: center; color: #ffffff; font-size: 20px">
<textarea id="textarea" name="text" maxlength="140" rows="15" cols="40" ></textarea><br><br>
<span id="count"></span> characters</p><br>
<p id="key"> </p>
</form>
Move your last three lines into your onkeyup function, this will update the #key element every time the input is updated. You also want to use str.length - 1 in the charCodeAt function, as you want to get the code for the last character, not just the 140th.

(+/-) button did not work on modal pop up

I want to make a modal pop up which inside of it contain a (+/-) button, it's work if it's not inside the modal, but it doesn't work inside of the modal.
Here is my (+/-) code :
<div class="col-md-12">
<button style="border: 1px solid #000000;padding: 2px;color: black"
class="incr-btn" data-action="decrease" href="#">-</button>
<input id="number" type="text" name="quantity" value="1"
style="max-height: 29px;max-width: 15px; border: 1px solid #000000">
<button style="border: 1px solid #000000;padding: 2px;color: black"
class="incr-btn" data-action="increase" href="#">+</button>
</div>
And here is my (+/-) js :
<script type="text/javascript">
$(".incr-btn").on("click", function (e) {
var $button = $(this);
var oldValue = $button.parent().find('.quantity').val();
$button.parent().find('.incr-btn[data-action="decrease"]').removeClass('inactive');
if ($button.data('action') == "increase") {
var newVal = parseFloat(oldValue) + 1;
} else {
// Don't allow decrementing below 1
if (oldValue > 1) {
var newVal = parseFloat(oldValue) - 1;
} else {
newVal = 1;
$button.addClass('inactive');
}
}
$button.parent().find('.quantity').val(newVal);
e.preventDefault();
});
</script>

Multiple plus and minus buttons

I am using - and + buttons to change the number of the text box, I am having troubles dealing with different text fields, here is my code:
var unit = 0;
var total;
// if user changes value in field
$('.field').change(function() {
unit = this.value;
});
$('.add').click(function() {
unit++;
var $input = $(this).prevUntil('.sub');
$input.val(unit);
unit = unit;
});
$('.sub').click(function() {
if (unit > 0) {
unit--;
var $input = $(this).nextUntil('.add');
$input.val(unit);
}
});
button {
margin: 4px;
cursor: pointer;
}
input {
text-align: center;
width: 40px;
margin: 4px;
color: salmon;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<div id=field1>
field 1
<button type="button" id="sub" class=sub>-</button>
<input type="text" id="1" value=0 class=field>
<button type="button" id="add" class=add>+</button>
</div>
<div id=field2>
field 2
<button type="button" id="sub2" class=sub>-</button>
<input type="text" id="2" value=0 class=field>
<button type="button" id="add2" class=add>+</button>
</div>
And here's the DEMO
You can see in the demo that the values change correctly only if you click buttons on the same field, but if you alternate between fields the values don't change properly.
This should be all you need:
$('.add').click(function () {
$(this).prev().val(+$(this).prev().val() + 1);
});
$('.sub').click(function () {
if ($(this).next().val() > 0) $(this).next().val(+$(this).next().val() - 1);
});
By using the unit variable you were tying both inputs together. And the plus in +$(this) is a shorthand way to take the string value from the input and convert it to a number.
jsFiddle example
You're using the same variable to hold the values of your two inputs. One simple option would be to use two variables instead of one:
var unit_1 = 0;
$('#add1').click(function() {
unit_1++;
var $input = $(this).prev();
$input.val(unit_1);
});
/* Same idea for sub1 */
var unit_2 = 0;
$('#add2').click(function() {
unit_2++;
var $input = $(this).prev();
$input.val(unit_2);
});
/* Same idea for sub2 */
and unit = unit just assigns the value of unit to itself, so that's no very useful and you can certainly leave it out.
An alternative approach is to use data attributes and have each element store its own value. Edit: it already stores its own value. Just access it.
var total;
// if user changes value in field
$('.field').change(function() {
// maybe update the total here?
}).trigger('change');
$('.add').click(function() {
var target = $('.field', this.parentNode)[0];
target.value = +target.value + 1;
});
$('.sub').click(function() {
var target = $('.field', this.parentNode)[0];
if (target.value > 0) {
target.value = +target.value - 1;
}
});
button {
margin: 4px;
cursor: pointer;
}
input {
text-align: center;
width: 40px;
margin: 4px;
color: salmon;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<div id=field1>
field 1
<button type="button" id="sub" class=sub>-</button>
<input type="text" id="1" value=0 class=field>
<button type="button" id="add" class=add>+</button>
</div>
<div id=field2>
field 2
<button type="button" id="sub2" class=sub>-</button>
<input type="text" id="2" value=0 class=field>
<button type="button" id="add2" class=add>+</button>
</div>

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