refresh DOM after append element

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星月不相逢

2020-12-09 16:59
You need to use event delegation for dynamically added element.
```
$(document).ready(function() {
    $('#main_body').append("<h1>Hello</h1><input id=\"but\" type=\"button\">Click");
    $('#main_body').on('click', '#but', function() {
        alert( "bla bla" );
    });
});
```
Event delegation allows us to attach a single event listener, to a parent element, that will fire for all children matching a selector, whether those children exist now or are added in the future
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孤独总比滥情好

2020-12-09 16:59

Use like this

<!doctype html>
<html>
<head>
<title>test</title>
<meta charset="UTF-8">
<script src="http://code.jquery.com/jquery-1.11.0.min.js"></script>
<script>

    $(document).ready(function () {
        $('#main_body').append("<h1>Hello</h1><input id=\"but\" type=\"button\">Click");
        $(document).on("click", "#but", function () {
            alert("bla bla");
        });
    });

</script>
</head>
<body id="main_body">
</body>

you should use event delegation for that

It helps you to attach handlers for the dynamically created elements

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挽巷

2020-12-09 17:01

$('#main_body).append("something").ready(() => {
  $('#but').click(() => {
  }) 
});

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野趣味

2020-12-09 17:03
For dynamically added elements you need event delegation, use the other version on jQuery on(), you can delegate event to static parent of the dynamically added elements. In your case you can use #main_body
```
$('#main_body').on( "click", "#but", function() {
    alert( "bla bla" );
});    
```
Delegated events have the advantage that they can process events from descendant elements that are added to the document at a later time. By picking an element that is guaranteed to be present at the time the delegated event handler is attached, you can use delegated events to avoid the need to frequently attach and remove event handlers, jQuery Docs

Your code works here as it is because you are adding the dynamically element before binding the event but using event delegation will free you from the sequence you use to add the dynamic elements.
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挽巷

2020-12-09 17:15

You code should work

Fiddle Demo

$(document).ready(function () {
    $('#main_body').append("<h1>Hello</h1><input id=\"but\" type=\"button\">Click");
    $("#but").on("click", function () { //element is in DOM now as it added in previous statement
        alert("bla bla");
    });
});

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