将事件处理程序附加到动态生成的元素

Question

I have the following HTML :

<button type="button" id="Button">Go</button>
<div id="validation"></div>

I'm trying to add event handlers to dynamically generated elements in the following way :

Click button -> Generate element X inside div #validation -> Attach event handler to element X

$(document).ready(function(){
    ID = 1;

    $("#Button").click(function(){

        /*generate new div inside div #validation with id #validationID
        1st one would be #validation1
        it contains a form with name accepterID and a button with name refuserID
        1st ones would be accepter1 and refuser1*/
        var newline = `
                    <div id="validation${ID}">
                        <form name="accepter${ID}">
                            <input type="hidden" name="name" value="phoegasus">
                            <button type="submit" value="valider">
                        </form>
                        <button name="refuser${ID}">refuser</button>
                    </div>
                    `
        $("#validation").append(newline);

        /*attach event handlers to the generated elements
        1st iteration would attach handlers to accepter1 and refuser1 */

        $("#validation").on('submit',"form[name^='accepter"+ID+"']",function(e){
            $("#validation" + ID).remove();
            //remove div validationID after submitting form
        });

        $("#validation").on('click',"button[name^='refuser"+ID+"']",function(){
            $("#validation" + ID).remove();
            //remove div validationID
        });

        ID++;

    });
});

When I submit the form or I click the generated button I want to remove the div that contains them. If I press the button refuser1, it should delete the div #validation1.

When the elements are generated the handlers aren't attached to them.

The code doesn't work when it's executed during the onclick event but when I execute it in the navigator console it works.

I tried using DOMSubtreeModified on the div with id #validation, but it didn't work.

Answer 1

you can manage it by using a class (or another element) in second argument of your on function.

For that, DO NOT declare your event listeners inside your add event.

This is a full working example :

 $("#validation").on('submit',"form.validation-form",function(e){ e.preventDefault(); console.log('form', $(this).attr('data-id'), ' submitted'); }); $("#validation").on('click',"button.validation-refuser",function(){ console.log('clicked on refuser for form ', $(this).attr('data-value')); //code }); var ID = 1; $('#my-adder').on('click', function () { $('#validation').append('<form name="accepter'+ID+'" class="validation-form" data-id="'+ID+'"><input type="text" placeholder="my text field" /><button class="validation-refuser" name="refuser'+ID+'" data-value="'+ID+'">Refuser button</button><button type="submit">SUBMIT</button></form>'); ID++; }) 

 <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <div id="validation"> <form name="accepter0" class="validation-form" data-id="0"> <input type="text" placeholder="my text field" /> <button type="button" class="validation-refuser" name="refuser0" data-value="0">Refuser button</button> <button type="submit">SUBMIT</button> </form> </div> <button id="my-adder">ADD A FORM</button> 

Hope it helps