The HTML code for the div would be.
I have defined two classes namely first,second to define the styles of the div. These classes get interchanged by simply clicking on the done.
How TO - Add a Class
Read previous post: Create Horizontal Menu in WordPress I know this is just another tutorial you found online for creating horizontal menu on a self hosted wordpress blogApplying this function to a class will cause all items calling on the class to change to the updated style value. This function works even if there are multiple stylesheets referenced in the document. Function Name: changecss theClass,element,value. Example of output Assuming you have a stylesheet defining the "exampleA" and "exampleB" classes -- the following code creates the effect below :.
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The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Modern browsers have added classList which provides methods to make it easier to manipulate classes without needing a library:.
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In these cases, you will need to use a standard for loop to iterate through the collection.
Attributes are values that contain additional information about HTML elements. Some of the most common HTML attributes are the src attribute of an img tag, the href of an a tag, classidand style. Custom elements that are not part of the HTML standard will be prepended with data. When you load the above HTML file into a modern web browser and open the built-in Developer Consoleyou should see something like this:. At this point, you will have removed the src attribute and value associated with imgbut you can reset that attribute and assign the value to an alternate image with img.
Finally, we can modify the attribute directly by assigning a new value to the attribute as a property of the element, setting the src back to the shark. The hasAttribute and getAttribute methods are usually used with conditional statementsand the setAttribute and removeAttribute methods are used to directly modify the DOM.Have you ever wished you could change the value of a Sass or Less variable after your page has loaded?
I have. I began by showing you how to define and use them and then offered some simple examples to make your code more readable and to help with contextual styling.
Last week I showed you how you can work with custom properties inside media queries. At the start of this series I mentioned that one of the major advantages of custom properties is their dynamic nature. Where preprocessor variables are turned into fixed values on compile, custom properties can change their values after a page has loaded. I touched on this dynamic ability last week when talking about media queries.
I then set the background-color property using the var function and gave it a transition of 1s just because. To change the background color I redefined the custom property on the :hover pseudo class and assigned it a new value of cce. Realistically we could have done this without the use of custom properties by changing the background-color property directly or even with the use of preprocessor variables.
The second line gets the specific value for the —color custom property defined in :root and assigns that value to a new variable colorValue. In this case —color is the only property, but in practice there would likely be others. The variable colorValue should now hold a value of red, which is the value I initially set on —color in the CSS.
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The key is to define extra rules for additional classes and add these classes to the elements rather than to rewrite the rules for a given style rule. To access the style rules defined by style sheets, you access the document. Each entry in that collection will have a property either called cssRules or rules depending on the browser. Each of those will be a CSSRule instance.
You can change the rule by changing its cssText property. But again, that's probably not the best way to solve the problem. But it is the literal answer to your question. The best way to solve the problem is probably to have another class in your stylesheet that overrides the settings of the previous rule, and then to add that class either to the select elements or to the container of them.
So for instance, you could have the rules:. I'm accessing CSS classes directly to adjust the height of a bunch of divs simultaneously. This is how I'm doing it:. I only tried this on chrome for windows, good luck with other browsers. You can edit the style sheets, but I would think you would just create a new class instead.
Here is a quick example of how you could create a new style sheet:. Removing a style sheet is also very simple.
First you must obtain the style sheet you wish to remove. You can do this by using document. To remove a style sheet you can use the DOM function parent. The accessing style sheets example demonstrates both accessing all styles sheets and adding and removing a new style sheet to the page.
You are in luck — the DOM style sheet interface gives us access to the disabled attribute, which allows us to turn style sheets on or off. You can also use the style sheet properties to help differentiate between multiple style sheets on the page.
A better way, which allows you to reference both internal and external style sheets individually, is to use the title property. If you iterate through document. The following example shows how you can accomplish this iteration:.
For each stylesheet object retrieved from the styleSheets array you can access its title property to check if it has the title our code is looking for. You can see a functional example of this in the adding and removing rules examplewhich I will discuss in the next section. Switching between different style sheets based on user preference is a fairly common web site feature — using what we have discussed so far, you can set up multiple style sheets and enable only the ones that the current site visitor would want to view.
You can easily turn the CSS back on by setting disabled to false. Check out my style sheet properties example for a practical look at how to use this. Remember the theoretical showcase site we discussed above? On our webpage we show all the articles at once, but our user only wants to see the CSS articles.
How might we do this? Using CSS will actually be faster than traversing over all the elements. Our stylesheet object has two functions to help us with this problem. First is the insertRule function, which looks like this:. Here is how it might look.
IE also uses removeRule instead of deleteRule and addRule selector, rule, index instead of insertRule. At this point you should understand how to edit style sheets connected to the page and create and modify the CSS rules within them.