HTML JS手风琴折叠其余的并警告活动的

Question

I have the following code where I need atleast one section at a time and not to allow 2 or more sections to be opened. When the click the button "Show Active accordion number" it should alert with the section number

Can anyone help me out with this?

that is to behave like https://jqueryui.com/accordion/

 var acc = document.getElementsByClassName("accordion"); var i; for (i = 0; i < acc.length; i++) { acc[i].onclick = function() { this.classList.toggle("active"); var panel = this.nextElementSibling; if (panel.style.maxHeight){ panel.style.maxHeight = null; } else { panel.style.maxHeight = panel.scrollHeight + "px"; } } } 

 button.accordion { background-color: #eee; color: #444; cursor: pointer; padding: 18px; width: 100%; border: none; text-align: left; outline: none; font-size: 15px; transition: 0.4s; } button.accordion.active, button.accordion:hover { background-color: #ddd; } button.accordion:after { content: '\\002B'; color: #777; font-weight: bold; float: right; margin-left: 5px; } button.accordion.active:after { content: "\\2212"; } div.panel { padding: 0 18px; background-color: white; max-height: 0; overflow: hidden; transition: max-height 0.2s ease-out; } 

 <h2>Accordion with symbols</h2> <p>In this example we have added a "plus" sign to each button. When the user clicks on the button, the "plus" sign is replaced with a "minus" sign.</p> <button class="accordion">Section 1</button> <div class="panel"> <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.</p> </div> <button class="accordion">Section 2</button> <div class="panel"> <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.</p> </div> <button class="accordion">Section 3</button> <div class="panel"> <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.</p> </div> <button onclick="alert('active acoordion is:')">Show Active accordion number</button> 

Answer 1

 var acc = document.getElementsByClassName("accordion"); var i; for (i = 0; i < acc.length; i++) { acc[i].onclick = function() { var label = this.innerHTML; var currentClasses = this.classList.toString(); for (j = 0; j < acc.length; j++) { if(acc[j]!=this) acc[j].classList = "accordion"; acc[j].nextElementSibling.style.maxHeight = null; } //if(currentClasses.includes('active')) this.classList.toggle("active"); var panel = this.nextElementSibling; if (panel.style.maxHeight){ panel.style.maxHeight = null; } else { panel.style.maxHeight = panel.scrollHeight + "px"; } } } var btn = document.getElementsByClassName("show-current")[0]; btn.onclick = function() { for (i = 0; i < acc.length; i++) { var classes = acc[i].classList.toString(); if (classes.includes('active')) alert( acc[i].innerHTML ) } } 

 button.accordion { background-color: #eee; color: #444; cursor: pointer; padding: 18px; width: 100%; border: none; text-align: left; outline: none; font-size: 15px; transition: 0.4s; } button.accordion.active, button.accordion:hover { background-color: #ddd; } button.accordion:after { content: '\\002B'; color: #777; font-weight: bold; float: right; margin-left: 5px; } button.accordion.active:after { content: "\\2212"; } div.panel { padding: 0 18px; background-color: white; max-height: 0; overflow: hidden; transition: max-height 0.2s ease-out; } 

 <button class="show-current">show current section</button> <h2>Accordion with symbols</h2> <p>In this example we have added a "plus" sign to each button. When the user clicks on the button, the "plus" sign is replaced with a "minus" sign.</p> <button class="accordion">Section 1</button> <div class="panel"> <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.</p> </div> <button class="accordion">Section 2</button> <div class="panel"> <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.</p> </div> <button class="accordion">Section 3</button> <div class="panel"> <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.</p> </div> 

Answer 2

 var acc = document.getElementsByClassName("accordion"); var i; for (i = 0; i < acc.length; i++) { acc[i].onclick = function() { for (var j= 0; j< acc.length; j++){ acc[j].classList.remove('active'); acc[j].nextElementSibling.style.maxHeight = null; } this.classList.add("active"); var panel = this.nextElementSibling; if (panel.style.maxHeight){ panel.style.maxHeight = null; } else { panel.style.maxHeight = panel.scrollHeight + "px"; } } } function showActive(){ for (var j= 0; j< acc.length; j++){ if(acc[j].className.indexOf('active') != -1){ alert(acc[j].innerHTML); } } } 

 button.accordion { background-color: #eee; color: #444; cursor: pointer; padding: 18px; width: 100%; border: none; text-align: left; outline: none; font-size: 15px; transition: 0.4s; } button.accordion.active, button.accordion:hover { background-color: #ddd; } button.accordion:after { content: '\\002B'; color: #777; font-weight: bold; float: right; margin-left: 5px; } button.accordion.active:after { content: "\\2212"; } div.panel { padding: 0 18px; background-color: white; max-height: 0; overflow: hidden; transition: max-height 0.2s ease-out; } 

 <h2>Accordion with symbols</h2> <p>In this example we have added a "plus" sign to each button. When the user clicks on the button, the "plus" sign is replaced with a "minus" sign.</p> <button class="accordion">Section 1</button> <div class="panel"> <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.</p> </div> <button class="accordion">Section 2</button> <div class="panel"> <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.</p> </div> <button class="accordion">Section 3</button> <div class="panel"> <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.</p> </div> <button onclick="showActive()">Show Active accordion number</button> 

Answer 3

Hope this helps. The below code will expand only one accordion at any point of time. Also, the code will toggle single accordion (ie click on section 1, it expands and again click on section 1, it closes).

 window.onload = function () { var acc = document.getElementsByClassName("accordion"); var i; for (i = 0; i < acc.length; i++) { acc[i].onclick = function (e) { [].slice.call(document.querySelectorAll(".accordion")).map(function (el) { if (el.innerHTML != e.target.innerHTML) { el.classList.remove("active"); el.nextElementSibling.style.maxHeight = null } }) this.classList.toggle("active"); var panel = this.nextElementSibling; if (panel.style.maxHeight) { panel.style.maxHeight = null; } else { panel.style.maxHeight = panel.scrollHeight + "px"; } } } } function showNo() { if (document.querySelector("button.accordion.active") != null) alert(document.querySelector("button.accordion.active").innerHTML.replace("Section ", "")) } 

 button.accordion { background-color: #eee; color: #444; cursor: pointer; padding: 18px; width: 100%; border: none; text-align: left; outline: none; font-size: 15px; transition: 0.4s; } button.accordion.active, button.accordion:hover { background-color: #ddd; } button.accordion:after { content: '\\002B'; color: #777; font-weight: bold; float: right; margin-left: 5px; } button.accordion.active:after { content: "\\2212"; } div.panel { padding: 0 18px; background-color: white; max-height: 0; overflow: hidden; transition: max-height 0.2s ease-out; } 

 <h2>Accordion with symbols</h2> <p>In this example we have added a "plus" sign to each button. When the user clicks on the button, the "plus" sign is replaced with a "minus" sign.</p> <button class="accordion">Section 1</button> <div class="panel"> <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.</p> </div> <button class="accordion">Section 2</button> <div class="panel"> <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.</p> </div> <button class="accordion">Section 3</button> <div class="panel"> <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.</p> </div> <button id="showNo" onclick="showNo()">Show Active accordion number</button> 

Answer 4

Just close all panels in a loop and open the current one after.

 var acc = document.getElementsByClassName("accordion"); var i; function closePanels() { var panelElements = document.getElementsByClassName("panel"); for (i = 0; i < panelElements.length; i++) { panelElements[i].style.maxHeight = 0; } } for (i = 0; i < acc.length; i++) { acc[i].onclick = function() { // close all panels closePanels(); // open current panel this.classList.toggle("active"); var panel = this.nextElementSibling; panel.style.maxHeight = panel.scrollHeight + "px"; } } 

 button.accordion { background-color: #eee; color: #444; cursor: pointer; padding: 18px; width: 100%; border: none; text-align: left; outline: none; font-size: 15px; transition: 0.4s; } button.accordion.active, button.accordion:hover { background-color: #ddd; } button.accordion:after { content: '\\002B'; color: #777; font-weight: bold; float: right; margin-left: 5px; } button.accordion.active:after { content: "\\2212"; } div.panel { padding: 0 18px; background-color: white; max-height: 0; overflow: hidden; transition: max-height 0.2s ease-out; } 

 <h2>Accordion with symbols</h2> <p>In this example we have added a "plus" sign to each button. When the user clicks on the button, the "plus" sign is replaced with a "minus" sign.</p> <button class="accordion">Section 1</button> <div class="panel"> <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.</p> </div> <button class="accordion">Section 2</button> <div class="panel"> <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.</p> </div> <button class="accordion">Section 3</button> <div class="panel"> <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.</p> </div>