Sometimes, subtle design elements can make a huge difference in user experience. Instead of displaying traditional error messages, a "shaking" effect on a login popover provides a clear and immediate indication that something went wrong. This tutorial will guide you through implementing this functionality using vanilla JavaScript , CSS animations , and the open-source library Tippy.js.

Our objective is to:

1. Create a login popover with Tippy.js.
2. Add the "shaking" effect when errors occur.
3. Automatically reset the animation once the shake ends.

Let’s dive in!

Part 1: Setting Up the Shaking Animation with CSS

We’ll start by defining a reusable CSS animation for the shake effect. The @keyframes rule below mimics a side-to-side shake:

@keyframes shaking {
    10%, 90% { transform: translate3d(-1px, 0, 0); }
    20%, 80% { transform: translate3d(2px, 0, 0); }
    30%, 50%, 70% { transform: translate3d(-4px, 0, 0); }
    40%, 60% { transform: translate3d(4px, 0, 0); }
}
.shake {
    animation: shaking 0.82s cubic-bezier(.36,.07,.19,.97) both;
}

• Keyframe Details : The translate3d property moves the popover slightly to the left and right to create the shaking effect.
• Reusable Class : Applying the shake class to any element triggers the animation.

Part 2: Creating the Login Popover with Tippy.js

We’ll use Tippy.js to create a clickable login popover. The popover will include:

• An email input field.
• A "Sign In" button.
• Event listeners to handle sign-in logic and the shake effect.

Here’s the core JavaScript for setting up the popover:

Step 1: The Sign-In Class

APP.Signin = class {
    constructor($target) {
        this.values = {}; // Store any required state
        if ($target) this.$target = $target; // The DOM element triggering the popover
        this.init(); // Initialize the popover
        return this;
    }

    // Trigger the shake animation
    shake() {
        this.$tippy.classList.add('shake');
        return this;
    }

    // Handle Sign-In button clicks
    onSigninClicked(event) {
        event.preventDefault();

        // Retrieve the entered email
        let email = document.querySelector('.app-signin-email').value;

        // Error and success handlers
        let _onError = () => this.shake();
        let _onSuccess = (response) => {
            if (response.errors.length) {
                this.shake(); // Shake on error
            } else {
                // Handle successful login
                console.log('Login successful!');
            }
        };

        // Simulate a backend login request
        let form_data = new FormData();
        form_data.append('method', 'quickSignIn');
        form_data.append('email', email);

        axios({
            method: 'POST',
            url: 'path/to/server',
            data: form_data,
            headers: { 'content-type': 'application/x-www-form-urlencoded;charset=UTF-8' },
        })
            .then((response) => (typeof response.data === 'string' ? JSON.parse(response.data) : response.data))
            .then(_onSuccess)
            .catch(_onError);
    }

    // Define the HTML content of the popover
    getContent() {
        return `
            <div>




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<hr>

<h3>
  
  
  Part 3: Wiring It All Together
</h3>

<p><strong>Simulated Backend</strong> : If you don’t have a real server, mock responses with a promise:<br>
</p>

<pre class="brush:php;toolbar:false">const mockServer = (email) =>
    new Promise((resolve, reject) => {
        setTimeout(() => {
            if (email === 'test@email.com') resolve({ errors: [] });
            else reject({ errors: ['Invalid email'] });
        }, 500);
    });

CSS for the Popover : Ensure the popover matches your design. Here’s a simple setup:

.app-signin {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.app-signin-email {
    width: 100%;
    padding: 10px;
    font-size: 1rem;
    border: 1px solid #ccc;
    border-radius: 4px;
}

.app-signin-btn {
    background-color: #007bff;
    color: white;
    text-align: center;
    padding: 10px;
    border-radius: 4px;
    cursor: pointer;
}

.app-signin-btn:hover {
    background-color: #0056b3;
}

HTML Trigger Element : Add a trigger element to your HTML:

<button>




<hr>

<h3>
  
  
  Part 4: Test the Shaking Effect
</h3>

<ol>
<li>Click the <strong>Sign In</strong> button to open the popover.</li>
<li>Enter an invalid email and submit. Watch the popover shake, indicating an error.</li>
<li>Enter a valid email and see no shaking—success!</li>
</ol>


<hr>

<h3>
  
  
  Conclusion: A User-Friendly Error Cue
</h3>

<p>The shaking effect enhances user experience by offering a clear, intuitive error indicator without cluttering the UI with extra messages. Combined with Tippy.js for a sleek popover and vanilla JS for interactivity, this setup is clean, functional, and visually appealing.</p>

<p>Keep experimenting and tweaking—because great UX is all about the details!</p>

<p>For more tips on web development, check out <strong>DailySandbox</strong> and sign up for our <strong>free newsletter</strong> to stay ahead of the curve!</p>


          

            
        

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