We Keep Coding

How to change background colour dynamically using Css

I've set up a method which when a button is clicked changes it's background colour and resets the colour of the other three buttons. The method for button1 looks like this
<script>
function changeBttn1() {
document.getElementById("bttn1").style.backgroundColor = '#add8e6';
document.getElementById("bttn2").style.backgroundColor = '#D3D3D3';
document.getElementById("bttn3").style.backgroundColor = '#D3D3D3';
document.getElementById("bttn4").style.backgroundColor = '#D3D3D3';
}...
Also I want to be able to make the Div that applies to each button appear and the others hidden with the same button press. The Div uses Class=Collapse which corresponds to Display:None in Bootstrap.css but I want to change it to run from the same method as the buttons. How can I do both events using Css?

Please do it like this very simple and easy
$('.my-btn').on('click',function(){
var colorval=$(this).attr('color');
$('.my-btn').css('background-color', 'grey');
$(this).css('background-color', colorval);
});
button{
background-color:grey;
padding:10px;
border:1px solid #000000;
color:#ffffff;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="button-wrapper">
<button class="my-btn" color="red">Red</button>
<button class="my-btn" color="green">Green</button>
<button class="my-btn" color="purple">Purple</button>
</div>

How Can I Copy Text From Hidden Textarea to Clipboard?

I have a hidden text area like this with some values set:
<textarea style="display: none;" id="element_html"></textarea>
On click of a button, I try to copy its content to clipboard using this JS code:
$('#element_html').select();
document.execCommand('copy');
It works only if the text area is visible. How can I copy the hidden text area content to clipboard?

opacity: .01;
does the job. You should combine it with:
height:0;
position:absolute;
z-index: -1;
Do not use pointer-events:none; as it will stop .select() from working, as well.
function copyContents() {
$('#element_html').select();
document.execCommand('copy');
}
#element_html {
position: absolute;
opacity: .01;
height: 0;
overflow: hidden;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<textarea id="element_html">Which textarea?</textarea>
<button onclick="copyContents()">Copy</button>
<input type="text" placeholder="Paste it here...">

You can create a temporary input element that is appended to the body, set it its value to the textarea's content and then use it for the copy function. Then you remove it from the dom. This will work - irrespective of the display state of the text area.
Note that I did not create this method - I got it from somewhere (possibly another SO answer) and have used it since in a number of instances.
function copyContents() {
var $temp = $("<input>");
var content = $('#element_html').text();
$("body").append($temp);
$temp.val(content).select();
document.execCommand("copy");
$temp.remove();
}
#element_html {
display: none
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<textarea id="element_html">Hidden textarea content</textarea>
<button onclick="copyContents()">Click to copy</button>
<input type="text" placeholder="Paste here">

The problem is that since the textarea has its display property set to none, its content can not be selected. You can absolutely position the textarea to the left with position: absolute and left: -9999px. You should also add z-index: -9999 so it will always be placed under other elements (unless they have a lower z-index).
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<textarea style="position: absolute; left: -9999px;" id="element_html">Text inside textarea</textarea>
<button onClick="copy()">
Copy
</button>
<p/>
<textarea placeholder="Paste text here..."></textarea>
<script>
function copy(){
$('#element_html').select();
document.execCommand('copy');
}
</script>

The Following codes worked for my problem. paste the js code inside your script tag/file.also add the css style to hide the textarea. Also, I found the following ideas through stackoverflow forum so all credit to those folks.
HTML code:
function cpy(n)
{
var id=n;
var txt=document.getElementById(id);
txt.select();
document.execCommand("copy");
};
/* The Following Code is to Hide textarea from The user view area */
textarea{
opacity: 0;
position: absolute;
z-index: -9999;
pointer-events: none;
}
<!-- readonly attribute is used because i found that in mobile devices, keyboard poped-up while i clicked the button to copy text-->
<textarea id="c1" readonly>
This is a text from textarea One.
</textarea><br>
<!--The cpy(this.id) passes button id to js function-->
<button id="c1" onclick="cpy(this.id)">Copy</button>
<input type=text placeholder="Paste Here to test">

How do I change HTML Label Text Once File Has Been Selected using Javascript

Thanks for viewing my question. I have a form below that has a file input field. Safe to say I have hidden this input field, and am now using the label as the primary "button" to select the files. Once a user clicks on the "Upload Picture..." label, I want the text inside the label to change from "Upload Picture..." to the file name. I'm following this tutorial below however the javascript written (in the tutorial) is for multiple files being able to be selected by the user. I only am allowing my users to select ONE file. This is a change your profile picture page to give a little insight as to what this form does.
Here is the code:
<!-- Change Picture Form -->
<div class="changepic-wrap">
<form action="changepicauth.php" method="post">
<input type="file" name="profilepic" id="profilepic" class="inputfile">
<br>
<label for="profilepic">
<img src="/images/profile/upload.png" />
Upload Picture...
</label>
<br>
<div class="button-wrap">
<button>Change Picture</button>
</div>
</form>
</div>
Here is the tutorial:
http://tympanus.net/codrops/2015/09/15/styling-customizing-file-inputs-smart-way/
Can someone help explain to me what i have to do? I'm thinking something along the lines of an eventlistener but i'm not sure about javascript. I'm a backend dev and know very little about javascript. I do NOT WISH TO USE JQUERY. Straight javascript only.
Thanks again for your help StackOverflow members! :D
Edit:
Some people have said that the text is changing already. It's not... I want the LABEL text to change. The "File Input" tag has two parts to it. The button, and the text next to the button. I've hidden the input tag using the following SASS code. This way only the "Upload Picture..." label text is displayed. Please make sure to add this SASS code to your file so you can see that the LABEL text does not change.
.inputfile
width: 0.1px
height: 0.1px
opacity: 0
overflow: hidden
position: absolute
z-index: -1

You can use the javascript onchange event to detect when the value of the #profilepic input changes.
When it does, you can capture the new value of the #profilepic input and replace the text of the label with that value.
Example:
var profilePic = document.getElementById('profilepic'); /* finds the input */
function changeLabelText() {
var profilePicValue = profilePic.value; /* gets the filepath and filename from the input */
var fileNameStart = profilePicValue.lastIndexOf('\\'); /* finds the end of the filepath */
profilePicValue = profilePicValue.substr(fileNameStart + 1); /* isolates the filename */
var profilePicLabelText = document.querySelector('label[for="profilepic"]').childNodes[2]; /* finds the label text */
if (profilePicValue !== '') {
profilePicLabelText.textContent = profilePicValue; /* changes the label text */
}
}
profilePic.addEventListener('change',changeLabelText,false); /* runs the function whenever the filename in the input is changed */
<div class="changepic-wrap">
<form action="changepicauth.php" method="post">
<input type="file" name="profilepic" id="profilepic" class="inputfile">
<br>
<label for="profilepic">
<img src="/images/profile/upload.png" />
Upload Picture...
</label>
<br>
<div class="button-wrap">
<button>Change Picture</button>
</div>
</form>
</div>

You can use change event, select element having for attribute value equal to event.target: #profilepic element id, set the .innerHTML of selected element to event.target.files[0] .name
document.getElementById("profilepic")
.addEventListener("change", function(e) {
document.querySelector("[for=" + e.target.id + "]")
.innerHTML = e.target.files[0].name;
})
.inputfile {
width: 0.1px;
height: 0.1px;
opacity: 0;
overflow: hidden;
position: absolute;
z-index: -1;
}
<!-- Change Picture Form -->
<div class="changepic-wrap">
<form action="changepicauth.php" method="post">
<input type="file" name="profilepic" id="profilepic" class="inputfile">
<br>
<label for="profilepic">
<img src="/images/profile/upload.png" />Upload Picture...
</label>
<br>
<div class="button-wrap">
<button>Change Picture</button>
</div>
</form>
</div>

Have a button auto adjust & stay next to text regardless of text length

How can I have a button automatically adjust and stay next to a word regardless of its length? I am dealing with usernames.
For example, if i have a button alongside a username the length of greg:
greg |BUTTON|
I would like to have that button automatically adjust if a user were to sign up with a username the length of for example:
williamson |BUTTON|
sam |BUTTON|
williamson_sam |BUTTON|
How can i achieve this? Thank you.

p {
float:left;
margin: 0 5px
}
button {
float:left;
}
<p>Williamson</p><button>Click Here</button>
<p>Bob</p><button>Click Here</button>

Since there is no snippet provided I tried to replicate the scenario. Hope this snippet will be useful
HTML
<input type= "text" id = "text">
<button id = "demoButton">Click</button>
<div>
<div id = "mySpan"></div>
<button type="button">DEMO BUTTON</button>
</div>
JS
var _getDemoButton = document.getElementById("demoButton");
_getDemoButton.addEventListener('click',function(){
document.getElementById("mySpan").innerHTML = document.getElementById("text").value
})
CSS
#mySpan{
display:inline-block;
width:auto;
border:1px solid red;
}
The css part will be of your interest
Here is a Jsfiddle for demo

Reset html required style with javascript

I have a form with an input with the attribute required set. When i submit the form and the input is empty, it shows a red border around it.
I am now looking for a javascript method to remove this, and reset the display of the input to the initial state.
After resetting and submitting again, the input should be checked again and show a red border if empty. Therefore i think setting css with :required does not give the desired solution.
A quick fiddle to illustrate my question:
jQuery(function() {
jQuery('#reset').click(function() {
//Clear red border of input
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<form id="myform">
<input id="myinput" required>
<input type="submit" value="submit">
</form>
<button id="reset">reset</button>
After clicking reset, the form should be shown as when the page is just loaded.
Edit
I tested this in firefox. In chrome the style automatically is removed when the element is onfocussed. However, i am still looking for a js solution to remove the message.

Edit, Updated
I want to reset the style, not prevent it from happening (when i dont
focus on it).
You can add a className to #myinput element which sets box-shadow to none and border to inherit at click on #reset element. Remove className at focus or change event on #myinput element, depedning on whether you want the box-shadow and border removed at focus on invalid input, or when user inputs a value.
.reset:-moz-ui-invalid:not(output) {
box-shadow: none;
border: 1px solid inherit;
}
When submitted, it shows a message like "This field is required". This
is removed when i unfocuss, but i am looking for a js method to remove
that message.
You can use invalid event, .setCustomValidity(" ") with a space character as parameter, called on event.target within handler.
You can use css :focus, :invalid to set border to red only when input gains focus and input is invalid. At html can add pattern attribute with RegExp \w+ to set input to invalid if value of input is empty string or only space characters
jQuery(document).ready(function() {
jQuery("#reset").click(function() {
jQuery("#myinput").addClass("reset")
});
jQuery("#myinput").focus(function() {
jQuery(this).removeClass("reset")
})
.on("invalid", function(e) {
e.target.setCustomValidity(" ");
})
})
#myinput:focus:invalid {
border: 1px solid red;
}
#myinput:focus {
outline: none;
}
.reset:-moz-ui-invalid:not(output) {
box-shadow: none;
border: 1px solid inherit;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<form id="myform">
<input id="myinput" pattern="\w+" type="text" value="" required/>
<input type="submit" value="submit" />
</form>
<button id="reset">reset</button>

I cannot reproduce it here. But probably your problem is the pseudo-class applied to the input.
Given that you cannot remove pseudo-classes, maybe you can override the style. Something like:
:invalid {
box-shadow: none;
}
:-moz-submit-invalid {
box-shadow: none;
}
:-moz-ui-invalid {
box-shadow:none;
}
If you just need to apply the style when the reset button is clicked, add the styles to your own class and add/remove the class when needed.

The initial keyword makes a CSS property take the browser's default style, if this is what you're looking for...
jQuery(function() {
jQuery('#reset').click(function() {
//Clear red border of input
jQuery('#myinput').css('border-color', 'initial');
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<style type="text/css">
#myinput {
border-color: red;
}
</style>
<form id="myform">
<input id="myinput" required>
<input type="submit" value="submit">
</form>
<button id="reset">reset</button>