生成一个按钮并将其绑定到另一个onclick函数

Question

How can I add a button and react to an outside onclick function? I need it available as well for the generated button and for static buttons that are on the site. At the moment I have the function twice to make it work for both kind of buttons, but that seems kind of redundant.

button.on("click", function() {
  banner.addClass("alt")
  $("<br><button class='test'>TEST</button><br>").insertAfter(button);

  //Here it works for the generated button:
  $(".test").on("click", function() {
    banner.removeClass("alt")
    banner.addClass("alt2")
  })

})

//Here it only works with the static buttons:
$(".test").on("click", function() {
  banner.removeClass("alt")
  banner.addClass("alt2")
})

https://jsfiddle.net/tdL3s4f8/

Answer 1

Add your click listener to parent container element handle in following ways. I chose document as parent you can have it more specific.

$(document).on('click', '.test', function(){
    banner.removeClass("alt")
    banner.addClass("alt2")
})

Answer 2

You need to search static ancestors (parent) of the dynamically added element. And bind certain event based on that parent.

 var banner = $("#banner-message") var button = $("button") button.on("click", function() { banner.addClass("alt") $("<br><button class='test'>TEST</button><br>").insertAfter(button); //This one works: //$(".test").on("click", function() { //banner.removeClass("alt") //banner.addClass("alt2") //}) }) //This one doesn't work: $("#banner-message").on("click",".test", function() { banner.removeClass("alt") banner.addClass("alt2") }) 

 body { background: #20262E; padding: 20px; font-family: Helvetica; } #banner-message { background: #fff; border-radius: 4px; padding: 20px; font-size: 25px; text-align: center; transition: all 0.2s; margin: 0 auto; width: 300px; } button { background: #0084ff; border: none; border-radius: 5px; padding: 8px 14px; font-size: 15px; color: #fff; } #banner-message.alt { background: #0084ff; color: #fff; margin-top: 40px; width: 200px; } #banner-message.alt2 button { background: #000; color: #fff; } #banner-message.alt2 { background: red; color: #fff; margin-top: 40px; width: 200px; } #banner-message.alt button { background: #fff; color: #000; } 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <div id="banner-message"> <p>Hello World</p> <button>Change color</button> </div>