We Keep Coding

Need help to find id of a specific element (external) to override styling by CSS

I'm trying to modify (by CSS) the dark gray "Contact Us" button that's at the bottom right side of the following site: coloraddicted.com.
This is a button created by an external app, so the code is inaccessible. I only have the following (external) page to refer to for the possibility of finding the right id: https://icf.improvely.com/icf-button.js?v=1479350309&shop=coloraddicted-com.myshopify.com
How can I find the "id" of the specific element in order to apply the
"overriding" CSS to it?
BTW, I have already tried several versions of the id's I see on the above mentioned external page but still haven't found the right one.
I can't remember all of them, but some I have already tried are:
#icf_button
#icf.click_button
#icf_contact_form button {
#icf_contact_form add_button {

Style Contact button by css has no effect, because right after user hover, js code excuted & override on.
You can put js code at the end of the body, to re-override on the library code (not the good way, but have to), example
let contactButton = document.querySelector('#shop-colorful-products-printed-on-demand-just-for-you > div:nth-child(38)');
contactButton.style.backgroundColor = 'white';
Demo image https://tinker.press/images/change-style-by-js-to-override-2017-01-17_090946.png

If you can't modify the button.js script you linked to, I don't think you can target this (reliably) in CSS. They style everything with that button using inline styles and just append it to body.
You could potentially use :nth-of-type (like https://icf.improvely.com/icf-button.js?v=1479350309&shop=coloraddicted-com.myshopify.com) but that would be super unreliable as I'm assuming you have a bunch of scripts and stuff on the site that dynamically append to the page, creating a variable number of divs as direct descendants of body. FWIW, nth-of-type(13) worked for me.

The element doesn't have an id, so you can't select it that way. But the site appears to be using jQuery, so you could try using :contains() to target the element based on its contents:
$( "div:contains('Contact Us')" ).css( "font-size", "2em" );
But that would target any div containing the text "Contact Us". You can use :filter to select divs that contain only the text "Contact Us":
$("div").filter(function() {
return $.trim($(this).text()) === "Contact Us";
}).css("font-size", "2em");
You could use jQuery to either apply CSS directly, or to give the element an id. This solution is kind of kludgy, but might work in a pinch.

on click apply class with different css properties

I am trying to apply a class on click to li of my div.
This is the js I have.
$(document).ready(function() {
$('#toggleme').click(function() {
$(this1).addClass('active_class');
});
});
Now when I click at the cart, I want to change that cart image.
I am trying to do that via the css by applying the class background-image:url(""); property. But for some reason I am not able to get it working.
Here's the fiddle
Please help.

Change your JS code to this:
$(document).ready(function () {
var img=0;
$('#toggleme').click(function () {
$(this).toggleClass('active_class');
if(img==0){
$(this).find("img").attr("src", 'http://cdn.mysitemyway.com/etc-mysitemyway/icons/legacy-previews/icons-256/simple-red-glossy-icons-business/086707-simple-red-glossy-icon-business-cart5.png');
img=1;
}else{
$(this).find("img").attr("src", 'http://www.daru-koi.com/images/winkelwagen.png');
img=0;
}
});
});
Here is the JSFiddle
Also note that the icon in your code is due to the img tag source and not the CSS. Therefore overwriting using CSS will not help.
The above code switches the source everytime you click.

See the cascade.
count 1 if the declaration is from is a 'style' attribute rather than a rule with a selector
You have two background image rules applying to the element:
.active_class {
background-image : url("http://cdn.mysitemyway.com/etc-mysitemyway/icons/legacy-previews/icons-256/simple-red-glossy-icons-business/086707-simple-red-glossy-icon-business-cart5.png");
}
and
style="background-image:none"
The style attribute one is more specific and "wins".
Avoid style attributes. Define the default styling in the stylesheet. (Or just remove it entirely since none is the default in the browser stylesheet).

Your jQuery is working correctly in that it is toggling the active_class when clicked. You can use developer tools (in Chrome or IE, press F12) to verify.
The problem is your jQuery targets the <li> element, but you have an <img /> element within it that is not affected by jQuery in any way.
You need to have the default cart image displayed as a background in CSS and use the jQuery to toggle between it and a different image.

Inserting CSS for an Element from a input field

Is there any easy way to take in a block of CSS from the user from an textarea and add this styling to the styling for a specific div?
See I'm creating a simple code preview tool like codePen, so far I have two textarea inputs, one for Html and one for CSS, as the user types in the Html input this updates the preview pane, this works, now I want to do it for CSS.
CSS textarea could contain a few blocks like:
h1 {
font-size:23px;
}
.myClass {
//Somestyle
}
Now I want this CSS to be contained in the
<div id="preview"></div>
So it doesnt effect the rest of the page, so a manual example would be
$('preview h1').css('font-size','23px');
Anyway to automate this?

Do it like this. Hope it works.
Add a style block for dynamic styling.
<style id="dynamicCss">
</style>
on the apply button click handler, set the style
$('#btnApplyStyle').click(function(){
$('#dynamicCss').html('').html($('#txtaCustomCss').val());
});
See the Fiddle here.
Please use developer tools to see the new style tag added to head section.
This script simply adds rule to the document. If you don't want that behavior, you can use this plugin in combination with my logic to set scope for rule. You will need to place the style tag inside of the container and add a scoped attribute to style for it to work. Please see the documentation.

If you want to use the iframe approach instead, you'll first need an HTML document to host inside of the iframe. The iframe document should be loaded for the same origin (protocol + domain) as the host document (cross-document cross-domain stuff is tricky otherwise). With your application, this is probably not an issue.
Host page:
<iframe id="preview" src="preview.html"></iframe>
To make things easier on yourself, this iframe document could load a script with convenience functions for injecting the HTML and CSS from the host.
preview.html:
<html>
<head>
<script src="preview.js"></script>
<style type="text/css" id="page-css"></style>
</head>
<body></body>
</html>
preview.js:
function setHTML(html) {
document.querySelector('body').innerHTML = html;
}
function setCSS(css) {
var stylesheet = document.querySelector('#page-css');
// Empty the stylesheet
while (stylesheet.firstChild) {
stylesheet.removeChild(stylesheet.firstChild);
}
// Inject new CSS
stylesheet.appendChild(document.createTextNode(css));
}
Now, from the host page, you can call these functions whenever your text inputs change:
document.querySelector('#preview').contentWindow.setCSS(someCSS);

This plugin may come in handy: https://github.com/websanova/wJSNova/downloads .

Edited
Insert the text of the rules in one of the existing cssStyleSheets you have.
It will be something like
window.document.styleSheets[0].insertRule("a{color:red;}",window.document.styleSheets[0].cssRules.length)
The first parameter is the rule to insert and the second is the index.
Fiddle
The only problem here is that this will affect all the DOM on the page maybe looking for a way to add the #preview before each css rule to get something like
#preview h1{}

Write a function inside jquery .html()

I am running a bg slider..."Supersized - Fullscreen Slideshow jQuery Plugin"
what i need is when a background changes some contents in a specific div must also change...
here i found a code line from script
if (options.slide_captions)
$('#slidecaption').html(options.slides[currentSlide].title);
this one pulls the image title to a specific div, but i want to load unique div for each background change...
or is there any other ways to do??
i have very little knowledge in jquery...
please help
advance thanks...

you can write this:
if (options.slide_captions) $('#slidecaption').html(options.slides[currentSlide].title, function(){
//write the code that load the unique div
});
tell me if it works

http://buildinternet.com/project/supersized/docs.html#theme-after
Check-out the theme.afterAnimation( ) documentation. You can set it to a function that changes the content after the slide changes.

create css class on the fly in codebehind

I have a search page that is used in multiple places with multiple 'themes' throughout my site. I have a few divs that can have their background color changed based on a radio button selection (whether they are enabled or not). I can do this just fine by changing the css class of the div on the fly with javascript.
However, these themes could potentially change, and the background color is grabbed from a database when the page is created. Right now I do this in the C# codebehind:
string bgStyle = "background-color:" +theme.searchTextHeaderColor +";";
OwnerSearchHeader.Attributes.Add("style", bgStyle);
In the Javascript I need to change this color to make it look disabled, and when the user clicks back to this div I need to re-enable it by changing it back to its original color. But since I only knew this color in the code-behind, I don't know what it was in the Javascript.
So my thought was to create a css class in the resulting HTML page when the page is loaded with the background color I need. Then I could simply switch from the divEnabled and divDisabled class in the javascript. But I'm not exactly sure how to do that.
Alternatively I could create a hidden element, assign it the 'enabled' style, and use that as a reference in the JavaScript when enabling my div. This seems like a hack but maybe its the easiest way. I'm still new to a lot of this, so I'd appreciate any suggestions. Thanks for the input!

So my thought was to create a css class in the resulting HTML page when the page is loaded with the background color I need. Then I could simply switch from the divEnabled and divDisabled class in the javascript. But I'm not exactly sure how to do that.
Yes, this is the anser; do this. In the <head> of your document add a <style> and put your CSS in there like so: (my Asp.NET is a little rusty so forgive me if it has some hicups ;) )
<style>
<!--
.divEnabled {
background-color:<%=theme.searchTextHeaderColor%>;
}
.divDisabled {
background-color:gray; /* or wtv */
}
-->
</style>
You could also put it in an external CSS file, which may be a good idea.
Then write some JavaScript to add/remove the class attribute (I'm going to ask that you don't call is the "CSS Class" ;) )
var ownersearchheader = document.getElementById("<%=OwnerSearchHeader.ClientId%>");
// changing the class attribute to `divDisabled`
var newClassAttribute = ownersearchheader.getAttribute("class").replace(/\bdivEnabled\b/, "divDisabled")
ownersearchheader.setAttribute("class", newClassAttribute);
// ... or,
// changing the class attribute to `divEnabled`
var newClassAttribute = ownersearchheader.getAttribute("class").replace(/\bdivDisabled\b/, "divEnabled")
ownersearchheader.setAttribute("class", newClassAttribute);
This is indeed a mouthfull, so, like #Haydar says, you might want to use jQuery, which offers easy-as-pie addClass(), removeClass() and toggleClass() methods.

You can use the jquery .toggleClass method.
Description: Add or remove one or more classes from each element in the set of matched elements, depending on either the class's presence or the value of the switch argument.
Here is the link to the api doc.
Jquery API