Show element with input button only with css - html

Question

I want to show an section when the checkbox is checked on another section, and show it with an animation from the top. I have the following code for the input that is in another section .
<div className="continue" id="first">
<button className="btn-continue">
Contratar Plano
<input type="checkbox" id="reveal-email" role="button"/>
</button>
</div>
<section className="plan-section" id="plan-section">
<div className="next">
<i class="arrow down"></i>
</div>
<div className="form-block">
<form className="form">
<div className="plan-form">
<div className="input-block">
<label htmlFor="name">Nome</label>
<input type="text" name="name" id="name" onChange={props.handleChange} required className="input" />
</div>
<div className="continue">
<button className="btn-continue" id="plan-continue" disabled={props.step.isLast()} onClick={props.next}>
<span className="btn-text">Contratar Plano</span>
<img className="check-btn" src={check} />
</button>
</div>
</div>
</form>
</div>
</section>
Also showing the section I need to show; this section has a default display:none.

Answer 1

Its a classic JS task. Use an onclick event to check if the checkbox is checked and then to change the section from display: none to display: block . Also Add an onclick event so that JS is triggered.
function showSection() {
var showSection = document.getElementById("reveal-email"),
planSection = document.getElementById("plan-section");
if (showSection.checked == true) {
planSection.style.display = "block";
} else {
planSection.style.display = "none";
}
}
#plan-section {
display: none;
}
<div className="continue" id="first">
<button className="btn-continue">Contratar Plano
<input type="checkbox" id="reveal-email" onclick="showSection()">
</button>
</div>
<section className="plan-section" id="plan-section">
<div className="next">
<i class="arrow down"></i>
</div>
<div className="form-block">
<form className="form">
<div className="plan-form">
<div className="input-block">
<label htmlFor="name">Nome</label>
<input type="text" name="name" id="name" onChange={props.handleChange} required className="input" />
</div>
<div className="continue">
<button className="btn-continue" id="plan-continue" disabled={props.step.isLast()} onClick={props.next}>
<span className="btn-text">Contratar Plano</span>
<img className="check-btn" src={check} />
</button>
</div>
</div>
</form>
</div>
</section>

Answer 2

One recommendation regarding your code:
<button className="btn-continue">
Contratar Plano
<input type="checkbox" id="reveal-email" role="button"></input>
</button>
It's not a good practice to group checkbox and some text into button, in HTML you can use label for that.
If JS solution is acceptable, you need to follow these steps:
Find your checkbox button and section in the DOM
Add event listener which will trigger callback function after each change of the checkbox state
In the callback function you need to trigger style for your section.
The full code is below:
var checkbox = document.getElementById('reveal-email');
var section = document.getElementById('plan-section');
checkbox.addEventListener('change', onChange)
function onChange() {
if (this.checked) {
section.style.display = "block";
} else {
section.style.display = "none";
}
}
<div className="continue" id="first">
<button className="btn-continue">
Contratar Plano
<input type="checkbox" id="reveal-email" role="button"/>
</button>
</div>
<section className="plan-section" id="plan-section" style="display:none">
<div className="next">
<i class="arrow down"></i>
</div>
<div className="form-block">
<form className="form">
<div className="plan-form">
<div className="input-block">
<label htmlFor="name">Nome</label>
<input type="text" name="name" id="name" onChange={props.handleChange} required className="input" />
</div>
<div className="continue">
<button className="btn-continue" id="plan-continue" disabled={props.step.isLast()} onClick={props.next}>
<span className="btn-text">Contratar Plano</span>
<img className="check-btn" src={check} />
</button>
</div>
</div>
</form>
</div>
</section>