如何检测 iframe 是否已加载? [英] How can I detect whether an iframe is loaded?

问题描述

我正在尝试在用户单击按钮后检查 iframe 是否已加载.

I am trying to check whether an iframe has loaded after the user clicks a button.

我有

$('#MainPopupIframe').load(function(){
    console.log('load the iframe')
    //the console won't show anything even if the iframe is loaded.
})

HTML

<button id='click'>click me</button>

//the iframe is created after the user clicks the button.
<iframe id='MainPopupIframe' src='http://...' />...</iframe>

有什么建议吗?

顺便说一下，我的 iframe 是动态创建的.它不会随着初始页面加载而加载.

By the way, my iframe is created dynamically. It doesn’t load with the initial page load.

推荐答案

你可以试试这个(使用 jQuery)

You may try this (using jQuery)

$(function(){
    $('#MainPopupIframe').load(function(){
        $(this).show();
        console.log('iframe loaded successfully')
    });
        
    $('#click').on('click', function(){
        $('#MainPopupIframe').attr('src', 'https://heera.it');    
    });
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<button id='click'>click me</button>

<iframe style="display:none" id='MainPopupIframe' src='' /></iframe>

jsfiddle 演示.

更新:使用普通的javascript

window.onload = function(){
    var ifr = document.getElementById('MainPopupIframe');
    ifr.onload=function(){
        this.style.display='block';
        console.log('laod the iframe')
    };

    var btn = document.getElementById('click');    
    btn.onclick=function(){
        ifr.src='https://heera.it';    
    };
};

<button id='click'>click me</button>

<iframe style="display:none" id='MainPopupIframe' src='' /></iframe>

jsfiddle 演示.

更新:你也可以试试这个(动态 iframe)

Update: Also you can try this (dynamic iframe)

$(function(){
    $('#click').on('click', function(){
        var ifr = $('<iframe/>', {
            id:'MainPopupIframe',
            src:'https://heera.it',
            style:'display:none;width:320px;height:400px',
            load:function(){
                $(this).show();
                alert('iframe loaded !');
            }
        });
        $('body').append(ifr);    
    });
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<button id='click'>click me</button><br />

jsfiddle 演示.

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