Event/method that expects content from an iframe to be fully loaded/rendered

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Event/method that expects content from an iframe to be fully loaded/rendered

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Hello, I am developing an html page, and in it I want to execute an iframe with another page (text) link, iframe takes about 2 to 3 seconds to be rendered/loaded, and I want to put an animation of "loading" until the iframe link is fully charged.

I looked at the list of DOM events but I couldn’t find one that fits my problem. https://www.w3schools.com/jsref/dom_obj_event.asp

This is the code responsible for dynamically creating iframe and its Source.

function texton(x) {
    var a = document.createElement('div')
    a.className = "iframe"
    a.innerHTML = `<iframe src=${x}></iframe>`
    a.innerHTML += '<button onclick="textoff()" class="btn btn-green" id="bclose">Fechar</button>'
    document.body.appendChild(a)
    a.addEventListener('load', function () {
        console.log("carregado com sucesso")
    })
}

There is an approach using only CSS. You tried to use otherwise or it has to be via JS itself?

– Cmte Cardeal

2020/11/17 at 16:49

1 answer

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by Cmte Cardeal • **5,299** points · Answer 1 · 2020-11-17T17:34:33+00:00

Using a gif animation, we can use CSS to insert a loading animation while iframe is being loaded. Animation will be a gif like background of a class we will use in the div that will contain the iframe, let’s call this class iframe-div. See the CSS:

.iframe-div {
   text-align: center;
   background: url(https://media1.giphy.com/media/3oEjI6SIIHBdRxXI40/200.gif)
        center center no-repeat;
}

Now in Javascript, let’s create an iframe using var iframe = document.createElement('iframe');, like you did for the div. I’ll put code with explanations:

function texton(x) {
            var a = document.createElement('div');
            var iframe = document.createElement('iframe'); // criamos um iframe dessa forma

            a.className = 'iframe-div'; // essa classe importante para a animacao

            // atribuir propriedades do iframe
            iframe.setAttribute('src', x); // source recebido como parametro
            iframe.setAttribute('id', 'iframe'); // esse id vai ser importante
            iframe.setAttribute('frameborder', '0');
            iframe.setAttribute('width', '500');
            iframe.setAttribute('height', '340');

            a.appendChild(iframe); // adicionamos o ifram dentro da div

            a.innerHTML +=
              '<button onclick="textoff()" class="btn btn-green" id="bclose">Fechar</button>';
            document.body.appendChild(a);

            var ifr = document.getElementById('iframe'); // aqui vamos pegar o elemento iframe 
                                                         // pelo id para ai sim verificarmos se o iframe carregou ou nao

            // agora sim podemos verificar se o iframe carregou.
            ifr.onload = function () {
              console.log('carregado com sucesso');
              a.setAttribute('class',''); removemos a classe para a animacao ser removida da div
            };
          }

          texton('https://www.youtube.com/embed/O6P86uwfdR0');

See the example below:

Note: the OS will not carry the content of iframe, but serves to exemplify

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <style>
    .iframe-div {
      text-align: center;
      background: url(https://media1.giphy.com/media/3oEjI6SIIHBdRxXI40/200.gif)
        center center no-repeat;
    }
  </style>
  <body>
    <script>
      function texton(x) {
        var a = document.createElement('div');
        var iframe = document.createElement('iframe');

        a.className = 'iframe-div';

        iframe.setAttribute('src', x);
        iframe.setAttribute('id', 'iframe');
        iframe.setAttribute('frameborder', '0');
        iframe.setAttribute('width', '500');
        iframe.setAttribute('height', '340');
        a.appendChild(iframe);

        a.innerHTML +=
          '<button onclick="textoff()" class="btn btn-green" id="bclose">Fechar</button>';

        document.body.appendChild(a);

        var ifr = document.getElementById('iframe');

        ifr.onload = function () {
          console.log('carregado com sucesso');
        };
      }

      texton('https://www.youtube.com/embed/O6P86uwfdR0'); // criando um iframe dinamicamente
    </script>
  </body>
</html>

This possible solution solves your problem?