在动态 html 元素上添加点击事件

Question

I looked at this example how to add click event on dynamically generate element jquery

It seemed close to my problem but I could not resolve it.

I want to be able to make items with javascript and add a click event handler on every row I add.
I have made this little snippet to illustrate my issue.

My Issue: The event is only added on the last row.

Here is my code.

 let items = [{name: "John"},{name: "Bob"},{name: "Joe"}]; let templatehtml = ` <label id="lblnumber{id}">{name}</label> <button id="btnView{id}" type="button" class="btn btn-primary">View</button> <br> `; items.forEach((item,index) => { item.index = index; AddUIitem(item,templatehtml); }); function AddUIitem(item,itemTemplate) { itemTemplate = itemTemplate.replace(/{id}/g, item.index); itemTemplate = itemTemplate.replace(/{name}/g, item.name); document.getElementById(`divContainer`).innerHTML += `${itemTemplate}`; document.getElementById(`btnView${item.index}`).addEventListener('click',()=>{ alert('Cliked ' + item.index); }); }

 <div id="divContainer"></div>

  function AddUIitem(item,itemTemplate)
  {
      itemTemplate = itemTemplate.replace(/{id}/g, item.index);
      itemTemplate = itemTemplate.replace(/{name}/g, item.name);
      document.getElementById(`divContainer`).innerHTML += `${itemTemplate}`;

      document.getElementById(`btnView${item.index}`).addEventListener('click',()=>{
          alert('Clicked ' + item.index);
      });
  } 
</script>

Answer 1

Problem is where the element is added. it is actually recreating the elements that have already been created un-linking the click events that have been set prior.

document.getElementById(`divContainer`).innerHTML += newelement;

So to solve this do not recreate the html of the element, instead add the new element to the existing container(element)

function AddUIitem(item,itemTemplate)
{

    itemTemplate = itemTemplate.replace(/{id}/g, item.index);
    itemTemplate = itemTemplate.replace(/{name}/g, item.name);

    let card = document.createElement("div");
    card.innerHTML = itemTemplate;

    document.getElementById(`divContainer`).appendChild(card);

    document.getElementById(`btnView${item.index}`).addEventListener('click',()=>{
        alert('Clicked ' + item.index);
    });
}

Answer 2

add your attribute values to class instead of id. and use "this" keyword