inViewport falsely returns true #22
Comments
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Huh, can you paste the code you used? |
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@dubstrike Make a jsfiddle/codepen and show the code please. |
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I have the same issue. I have the following JavaScript code: window.addEventListener('scroll', function(e) {
let test = $('#testme').get(0);
if ( verge.inViewport(test) ) {
test.style.backgroundColor = "blue";
console.log('TRUE');
} else {
test.style.backgroundColor = "red";
console.log('FALSE');
}
});and the following HTML: <!--A few elements here-->
<div style="height:2000px;"></div>
<div id="testme" style="width: 100%; height: 500px; background-color: red;"></div>The result is always true, the console never logs |
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I think I was able to reproduce on codepen and I commented what seems potential workarounds there. Does |
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@ramtinsoltani Can you reproduce that in codepen please? Either by forking mine or creating new and loading |
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@ryanve Well I've made this codepen using the link to load verge, and it's working! But using the same link in a local .html file (or downloading verge.js and loading it locally) still behaves as before! I'm using Chrome 62.0.3202.62 64-bit on Windows 10. So to reproduce it, copy the code below and save them as local files. Then run the .html file and you should run into the issue I'm having when you look at the Dev Tools console. These are the exact code I'm using locally (same as codepen but the html contains a script tag to load the javascript after loading verge): index.html <html>
<head>
<script src="https://code.jquery.com/jquery-3.2.1.min.js"></script>
<script src="https://unpkg.com/[email protected]/verge.js"></script>
<script src="./script.js"></script>
</head>
<body>
<div style="height:2000px;"></div>
<div id="testme" style="width: 100%; height: 500px; background-color: red;"></div>
<div style="height:2000px;"></div>
</body>
</html>script.js window.addEventListener('scroll', function(e) {
let test = $('#testme').get(0);
if ( verge.inViewport(test, -1) ) {
test.style.backgroundColor = "blue";
console.log('TRUE');
} else {
test.style.backgroundColor = "red";
console.log('FALSE');
}
});When you scroll all the way down, these are the different console logs: Codepen output (the correct output, only logs TRUE when the element is in view): Local output (the incorrect output, only logs FALSE if you scroll pass the element, the rest of the time it logs TRUE): I hope this helps. |
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Great repro @ramtinsoltani! I reproduced it now too locally in Windows 7 in Chrome and FF. I isolated it to Math.max(document.documentElement.clientHeight, window.innerHeight || 0)I used actual to confirm the correct viewport height but it was obviously wrong in my window because it was the result was so huge that it was like the document height actual("height", "px") // 986
window.innerHeight // 986
$(window).height() // 4516
document.documentElement.clientHeight // 4516<script src="https://unpkg.com/[email protected]/actual.js"></script>We could use actual or a similar function viewportH() {
var docElem = document.documentElement
var inner = window.innerHeight || 0
var client = docElem.clientHeight
var offset = docElem.offsetHeight
if (inner >= client) return inner
if (!inner) return client
if (client < offset) return client
return inner
} |
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Whoa I just figured out why the local differs from the codepen. Local has no doctype, If you add one then it works as expected! Discovered via S/O <!DOCTYPE html>So we either could warn about this in the readme and/or attempt a solution that works regardless. |
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I attached
verge.inViewportto a scroll event to test this.When I start scrolling I keep getting
truereturned even if the element is not in the viewport. Only after I scroll past the desired element,falseis returned.If I scroll back up past that element, it's still
true.The text was updated successfully, but these errors were encountered: