|jQuery 3 - Creating & Modifying The DOM|
|Written by Ian Elliot|
|Monday, 31 October 2016|
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Although not really the same as the other wrap methods it is worth introducing the unwrap method here as it is close to being an inverse of wrap.
The simple unwrap() method will remove the parents of each element in the results. For example:
Will remove the parent of each div in the results list. You can also specify a selector. For example:
will only remove the parent of the div if it is a paragraph.
You can see that using an unwrap followed by a wrap you can change the wrapper. For example if you want to replace all of the divs wrapping the button tags:
with h1 tags we could use:
However notice that the result is:
Which is as promised but perhaps not what everyone would expect. Notice that the button that was wrapped by a span has also been wrapped by an h1. That is all of the buttons have been wrapped by h1, irrespective of whether they were wrapped by ??div that has been removed. Obvious yes, but unwrap plus wrap doesn't give you a way to replace one wrapper with another unless all of the DOM structures concerned are wrapped by the same type of element or you unwrap without selecting. That is:
and in this case the wrappers have been changed from what ever they were to h1.
Inserting At The Same Level
The append/prepend methods insert elements as children. The wrap methods insert elements are parents. What is left are methods that insert an element as a sibling i.e. at the same level in the hierarchy and not as a child or as a parent.
If you are inserting the new DOM structure at the same level you really only have a choice of before or after. The before method inserts the new elements before each of the elements in the results array and the after method inserts them after.
Creates the DOM equivalent to:
Using after would place the new paragraph after the button.
As in the case of append/prepend there are versions of the two methods that work the other way round. That is, insertBefore and insertAfter insert every element of ??the result at the result array before or after the target respectively. For example
creates a new DOM structure with all of the buttons in the existing DOM in front of the structure i.e. <p>A button</p>.
As with appendTo and prependTo you can use insertBefore and insertAfter to move existing elements.
will move all of the buttons to be after the element with id movelocation.
Replacing & Removing
As well as inserting new elements you can also replace existing elements with new elements. There are two methods that let you do this easily replaceAll and replaceWith. They do the same job but swap over the roles of what is replaced and what replaces it.
will replace every element in the results array by the newElement. For example if you have:
This is easy but it is important to note that replaceWith returns the original results array, that is without the replacements having been made. The replacements are made to the DOM and not to the results array.
The replaceAll(target) method does the same job as the replaceWith method but replacing all of the target elements with the results. For example:
would replace all p elements with div elements. You can use an element already in the DOM as the replacement and in this case the effect is to remove the existing element and replace the target. For example:
will replace the element with id target by moving the element with id move to its location in the DOM.
Removing DOM elements is just a special case of replacing by a null element but there are special functions for this.
We have already encountered unwrap() which will remove the parent of each element in the results list. If you want to leave the parents and remove the children then you can use the empty function. This removes all of the children from each element in the results list. For example:
removes all of the children of each p element.
In addition there is the remove function which will completely remove all of the elements in the result that match the specified target. For example
will remove from the DOM all of the p elements that have class1 as their class. The important thing to know about remove is that it not only removes the element but all of the child elements it contains. In other words it removes the entire sub-hierarchy starting at each of the nodes it removes. It also removes data and event handlers - it really is a remove function.
If you want a gentler version of the remove function then you need detach. This works in the same way but doesn't remove the data and event handlers. Essentially it removes the results list of elements from the DOM but leaves them functioning with data and event handlers etc. This means you can save them and put them back in to the DOM at a later date. For example:
will remove all of the p elements from the DOM including all of their contents. As the detach function returns the original results list this can be saved and put back into the DOM using something like:
|Last Updated ( Wednesday, 30 November 2016 )|