Tips to Use MutationObserver API for DOM Node Changes

Can I use Mutation Observer Chart

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Guide: Tips to Use MutationObserver API for DOM Node Changes

Here’s a screenplay: Rita, a magazine writer, is editing an article of hers online. She saves her changes and sees the message “changes saved!” It is then that she notices a typo she missed. She fixes it and is about to click “save” when she gets angry phone phone call from her boss.

After the conversation ends, she returns to the screen and sees ‘changes saved!’ shuts down her computer and storms out of the office.

Aside from my inability to tell stories, it was from that brief scenario that we noticed the problems that persistent message presented. So, in the future, we decide to avoid it where possible and use one that asks the user to confirm by clicking on it – or disappears by itselfIt’s a good idea to use the second for quick messages.

We already know how to makes an element disappear from a page, so that shouldn’t be a problem. What we need to know is when did it appear? So that we can make it disappear after a reasonable amount of time.

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MutationObserver API

In general, we should be able to know when a DOM element (such as a message div) or another node changes. For a long time developers had to rely on hacks and frameworks due to the lack of a native API. But that had changed.

We now have MutationObserver (formerly Mutation Events). MutationObserver is a native JavaScript object with a set of properties and methods. It allows us observe a change at any node such as DOM element, document, text, etc. By mutation we mean adding or removing a node and changes to the attribute and data of a node

Let’s take a look at an example for better understanding. We first make a set up where a message appears button click, as Rita saw. Then we will create and associate a mutation observer with that message box and code the logic to auto-hide the messageSmart?

Note: Maybe at some point you have already asked me in your head, “Why don’t you just hide the message from within the button click on the event itself in JavaScript? In my example, I’m not working with a server, so of course the client is responsible for showing the message and can hide it too easily. But as in Rita’s editing tool, if the server is the one that decides to change the DOM content, the customer just stay alert and wait.

First we make the setup to display the message button Click.

var msg = document.querySelector (‘# msg’), SUCCESSMSG = “Changes saved!”;

/ * Add button click event * / document.querySelector (‘button’) .addEventListener (‘ click ‘, showMsg);

function showMsg () {msg.textContent = SUCCESSMSG; msg.style.background = ‘teal’;}

Once we’ve done the initial setup, we’ll do the following;

  • Create a MutationObserver object with a user-defined callback function (the function will be defined later in the message). The function is performed on any mutation detected by the MutationObserver.
  • Create a configuration object to specify the type of mutations to be observed by the MutationObserver.
  • Bind the MutationObserver to the target, which in our example is the ‘msg’ div.

(function startObservation () {var / * 1) Create a MutationObserver object * / observer = new MutationObserver (function (mutations) {mutationObserverCallback (mutations);}), / * 2) Create a configuration object * / config = { childList: true};

/ * 3) Glue’em all * / observer.observe (msg, config);}) ();

Below is a list of properties for the configuration object that identifies the different types of transactions. Since we are only dealing with a child text node created for the message body in our example, we used the childList property.

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Types of observed mutations

PropertyIf set to true
childListThe insertion and removal of the target’s underlying nodes is observed.
attributesChanges in the target’s attributes are observed.
characterDataChanges in the target data are observed.

Now, to that callback function that is performed on every observed mutation.

function mutationObserverCallback (mutations) {/ * Grab the first mutation * / var mutationRecord = mutations[0]; / * If a child node has been added, hide the message after 2s * / if (mutationRecord.addedNodes[0] ! == undefined) setTimeout (hideMsg, 2000);} function hideMsg () {msg.textContent = ””; msg.style.background = ‘none’;}

Since we are only adding a message to the div, we will take the first mutation observed on it and check if a text node has been inserted. If more than one change occurs, we can just walk through the mutation array.

Each mutation in the mutation array is represented by the MutationRecord object with the following properties.

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Features of MutationRecord

PropertyReturns
addedNodesEmpty array or array of nodes added.
attribute nameNull or name of the attribute that was added, removed, or changed.
attributeNamespaceNull or namespace of the attribute that was added, removed, or changed.
nextSiblingNull or trailing sibling of the node that has been added or removed.
oldValueNull or previous value of the attribute or data has been changed.
previousSiblingNull or previous sibling of the node that was added or removed.
removeNodesEmpty array or string of nodes that have been deleted.
targetNode targeted by the MutationObserver
typeType of mutation observed.

And that’s it. we just need to compile the code for the final step.

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Browser support

IMAGE: Can I Use.Web. January 19

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Reference

  • “W3C DOM4 Mutation Observer.” W3C. Web. January 19
  • MutationObserver. Mozilla Developer Network. Web. January 19.
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Tips to Use MutationObserver API for DOM Node Changes: benefits

  • The Tips to Use MutationObserver API for DOM Node Changes tutorial is free .
  • This guide already helps so many users follow up with interest in a timely manner.
  • The price of the Tips to Use MutationObserver API for DOM Node Changes guide is free.

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Faq

Tutorial summary of Tips to Use MutationObserver API for DOM Node Changes

In this guide, we told you about the Tips to Use MutationObserver API for DOM Node Changes; please read all steps so that you understand Tips to Use MutationObserver API for DOM Node Changes in case if you need any assistance from us, then contact us.

How this tutorial helping you?

So in this guide, we discuss the Tips to Use MutationObserver API for DOM Node Changes, which undoubtedly helps you.

What is actual time in which this method complete?

The time to complete the Tips to Use MutationObserver API for DOM Node Changes tutorial is 10+ minutes.

What are the supported Device?

PC Laptop or Desktop


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