My website features a large banner image with content followed by an embedded YouTube video within an iframe. While the webpage is responsive, on mobile devices the header appears too big and users have to scroll down to see the video.
I want the webpage to automatically scroll down to the iframe when accessed on a mobile device. How can I accomplish this seamless transition for a better user experience?
In order to make this work, JavaScript is required.
document.documentElement.clientHeightIf the height is insufficient, you may need to scroll down:
window.scrollTo(0, 500);
To address this issue:
if(document.documentElement.clientHeight < 500) {
window.scrollTo(0, 500);
}
The proper height depends on your banner size and Iframe location.
Another option is to move your banner below the Iframe using CSS only if the window height is inadequate.
Media Queries can be utilized for this purpose:
div div {
width:100px;
height:100px;
}
div[blue] {
background-color:blue;
}
div[green] {
background-color:green;
}
div[parent] {
display:flex;
flex-direction: column-reverse;
}
@media only screen and (min-width: 600px) {
div[parent] {
flex-direction: column;
}
}<div parent>
<div green>
green
</div>
<div blue>
blue
</div>
</div>If you want to check if the screen is too small, you can use window.innerHeight, and then scroll down to the iframe using window.scrollTo();.
maxHeight = 600;
function scrollIfMobile() {
if (window.innerHeight < maxHeight) {
var height = document.getElementById("iframe").offsetTop;
window.scrollTo(0, height);
}
}div {
height: 400px;
background: lightblue;
margin: 8px;
}<body onload="setTimeout(scrollIfMobile,1)">
<div>
Block<br />
</div>
<div id="iframe">
Iframe<br />
</div>
<div>
...
</div>
<div>
...
</div>
</body>Check out my example here and resize the window to see it in action.
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