How to make an iFrame to go fullscreen on a button click?

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感情败类 2021-02-04 08:21
I would to make the iFrame to appear on fullscreen with a button click using JavaScript.
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                <span>(楼主)</span>
            
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                <span>2021-02-04 08:45</span>
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<p>You will have to do two things: make the window fullscreen, and then the <code><iframe></code> to fill up the whole size.</p>

<p>You can make it go fullscreen with JS such as in this SO answer.</p>

<p>Then, to make it full size, just add a few styles, like below. What this JS script does is add a class with those styles to the <code><iframe></code>.</p>

<p><strong>JS</strong></p>

<pre><code>document.getElementsByTagName("iframe")[0].className = "fullScreen";
</code></pre>

<p><strong>CSS</strong></p>

<pre><code>body, html {
    height: 100%;
    margin: 0;
}
.fullScreen {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
}
</code></pre>

<p>See this partially working* example on JSFiddle.</p>

<p><sub>*partially working because JSFiddle doesn't allow the fullscreen method because it deems it unsafe. But it should work for you.</sub></p>
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