Scale logo on scroll with jQuery, dependant on scroll percentage
I want to scale down logo in the header as user scrolling down the page.
When he hits a certain breakpoint, scaling should stop.
Also, scale can't be more or less specified hardcoded sizes.
Live case:
The header is separated into two section - top and bottom. The bottom part is sticky (pos: fixed) and the top part gets faded out (pos: absolute).
Logo should be smoothly scaled, so it's big (140px height) when all header elements are visible and small (50px height) when it's sticky
So, I can't figure out how to calculate a number within a range of limit[0] and limit[1] that is dependant on the percentage of scroll distance between 0 and 100 (100 is a header top height in my case)
Currently, it's scaling 1 to 0, but I need to scale 1 to 0.357
===
Short video (10s) to demonstrate a problem
https://monosnap.com/file/p5P7GMkn3BKKMu9glrnmBiO5X6951z
Codepen
https://codepen.io/dpmango/pen/EOXVww
===
$(window).on('scroll', function(e) {
var vScroll = _window.scrollTop();
var $logo = $('[js-header-logo]');
var $top = $('[js-header-top]');
var topHeight = $top.outerHeight();
var logoLimits = [1, 0.357] // [140, 50] // scale factor
var scrollPercent = 1 - (vScroll / topHeight) // 1 -> 0
var calcedScale = scrollPercent // what is logic ?
// limit rules
if ( vScroll > topHeight ){
calcedScale = logoLimits[1]
}
if ( vScroll < 0 ){
calcedScale = logoLimits[0]
}
// set values to DOM
$logo.css({
"transform": 'scale('+ calcedScale +')'
})
});
javascript jquery
asked Nov 15 '18 at 19:30
Sergey KhmelevskoySergey Khmelevskoy
1,08221029
|
show 3 more comments
I want to scale down logo in the header as user scrolling down the page.
When he hits a certain breakpoint, scaling should stop.
Also, scale can't be more or less specified hardcoded sizes.
Live case:
The header is separated into two section - top and bottom. The bottom part is sticky (pos: fixed) and the top part gets faded out (pos: absolute).
Logo should be smoothly scaled, so it's big (140px height) when all header elements are visible and small (50px height) when it's sticky
So, I can't figure out how to calculate a number within a range of limit[0] and limit[1] that is dependant on the percentage of scroll distance between 0 and 100 (100 is a header top height in my case)
Currently, it's scaling 1 to 0, but I need to scale 1 to 0.357
===
Short video (10s) to demonstrate a problem
https://monosnap.com/file/p5P7GMkn3BKKMu9glrnmBiO5X6951z
Codepen
https://codepen.io/dpmango/pen/EOXVww
===
$(window).on('scroll', function(e) {
var vScroll = _window.scrollTop();
var $logo = $('[js-header-logo]');
var $top = $('[js-header-top]');
var topHeight = $top.outerHeight();
var logoLimits = [1, 0.357] // [140, 50] // scale factor
var scrollPercent = 1 - (vScroll / topHeight) // 1 -> 0
var calcedScale = scrollPercent // what is logic ?
// limit rules
if ( vScroll > topHeight ){
calcedScale = logoLimits[1]
}
if ( vScroll < 0 ){
calcedScale = logoLimits[0]
}
// set values to DOM
$logo.css({
"transform": 'scale('+ calcedScale +')'
})
});
javascript jquery
asked Nov 15 '18 at 19:30
Sergey KhmelevskoySergey Khmelevskoy
1,08221029
Can you post the HTML?
– Minder Mondo
Nov 15 '18 at 19:32
@MinderMondo Thank you for the comment, but html is not a case here. It's a javascript question
– Sergey Khmelevskoy
Nov 15 '18 at 19:40
1
I believe what you're looking for is just a simple Linear Normalization formula. I'd written an answer a while back with a basic JS function that takes input bounds (0and100in your case), the normalized bounds (0.357and1in your case), and the number you'd like to convert (the current percent), to give you the new number. You can see that here.
– Tyler Roper
Nov 15 '18 at 20:13
1
And for some follow-up, I'd actually re-used that same formula in a much more recent answer where someone was trying to convert a test grade (0-100) to a GPA (1.0 - 4.0), if that implementation is more suitable to your specific example.
– Tyler Roper
Nov 15 '18 at 20:22
2
@TylerRoper Exactly what I was looking for, but unable to describe. I've addednormalize(vScroll, topHeight, 0, logoLimits[1], logoLimits[0])from your GPA example and it works! Thank you so much
– Sergey Khmelevskoy
Nov 15 '18 at 20:29
|
show 3 more comments
I want to scale down logo in the header as user scrolling down the page.
When he hits a certain breakpoint, scaling should stop.
Also, scale can't be more or less specified hardcoded sizes.
Live case:
The header is separated into two section - top and bottom. The bottom part is sticky (pos: fixed) and the top part gets faded out (pos: absolute).
Logo should be smoothly scaled, so it's big (140px height) when all header elements are visible and small (50px height) when it's sticky
So, I can't figure out how to calculate a number within a range of limit[0] and limit[1] that is dependant on the percentage of scroll distance between 0 and 100 (100 is a header top height in my case)
Currently, it's scaling 1 to 0, but I need to scale 1 to 0.357
===
Short video (10s) to demonstrate a problem
https://monosnap.com/file/p5P7GMkn3BKKMu9glrnmBiO5X6951z
Codepen
https://codepen.io/dpmango/pen/EOXVww
===
$(window).on('scroll', function(e) {
var vScroll = _window.scrollTop();
var $logo = $('[js-header-logo]');
var $top = $('[js-header-top]');
var topHeight = $top.outerHeight();
var logoLimits = [1, 0.357] // [140, 50] // scale factor
var scrollPercent = 1 - (vScroll / topHeight) // 1 -> 0
var calcedScale = scrollPercent // what is logic ?
// limit rules
if ( vScroll > topHeight ){
calcedScale = logoLimits[1]
}
if ( vScroll < 0 ){
calcedScale = logoLimits[0]
}
// set values to DOM
$logo.css({
"transform": 'scale('+ calcedScale +')'
})
});
javascript jquery
asked Nov 15 '18 at 19:30
Sergey KhmelevskoySergey Khmelevskoy
1,08221029
I want to scale down logo in the header as user scrolling down the page.
When he hits a certain breakpoint, scaling should stop.
Also, scale can't be more or less specified hardcoded sizes.
Live case:
The header is separated into two section - top and bottom. The bottom part is sticky (pos: fixed) and the top part gets faded out (pos: absolute).
Logo should be smoothly scaled, so it's big (140px height) when all header elements are visible and small (50px height) when it's sticky
So, I can't figure out how to calculate a number within a range of limit[0] and limit[1] that is dependant on the percentage of scroll distance between 0 and 100 (100 is a header top height in my case)
Currently, it's scaling 1 to 0, but I need to scale 1 to 0.357
===
Short video (10s) to demonstrate a problem
https://monosnap.com/file/p5P7GMkn3BKKMu9glrnmBiO5X6951z
Codepen
https://codepen.io/dpmango/pen/EOXVww
===
$(window).on('scroll', function(e) {
var vScroll = _window.scrollTop();
var $logo = $('[js-header-logo]');
var $top = $('[js-header-top]');
var topHeight = $top.outerHeight();
var logoLimits = [1, 0.357] // [140, 50] // scale factor
var scrollPercent = 1 - (vScroll / topHeight) // 1 -> 0
var calcedScale = scrollPercent // what is logic ?
// limit rules
if ( vScroll > topHeight ){
calcedScale = logoLimits[1]
}
if ( vScroll < 0 ){
calcedScale = logoLimits[0]
}
// set values to DOM
$logo.css({
"transform": 'scale('+ calcedScale +')'
})
});
javascript jquery
javascript jquery
asked Nov 15 '18 at 19:30
Sergey KhmelevskoySergey Khmelevskoy
1,08221029
asked Nov 15 '18 at 19:30
Sergey KhmelevskoySergey Khmelevskoy
1,08221029
edited Nov 15 '18 at 20:14
Sergey Khmelevskoy
asked Nov 15 '18 at 19:30
Sergey KhmelevskoySergey Khmelevskoy
1,08221029
asked Nov 15 '18 at 19:30
Sergey KhmelevskoySergey Khmelevskoy
1,08221029
asked Nov 15 '18 at 19:30
Sergey KhmelevskoySergey Khmelevskoy
1,08221029
1,08221029
Can you post the HTML?
– Minder Mondo
Nov 15 '18 at 19:32
@MinderMondo Thank you for the comment, but html is not a case here. It's a javascript question
– Sergey Khmelevskoy
Nov 15 '18 at 19:40
1
I believe what you're looking for is just a simple Linear Normalization formula. I'd written an answer a while back with a basic JS function that takes input bounds (0and100in your case), the normalized bounds (0.357and1in your case), and the number you'd like to convert (the current percent), to give you the new number. You can see that here.
– Tyler Roper
Nov 15 '18 at 20:13
1
And for some follow-up, I'd actually re-used that same formula in a much more recent answer where someone was trying to convert a test grade (0-100) to a GPA (1.0 - 4.0), if that implementation is more suitable to your specific example.
– Tyler Roper
Nov 15 '18 at 20:22
2
@TylerRoper Exactly what I was looking for, but unable to describe. I've addednormalize(vScroll, topHeight, 0, logoLimits[1], logoLimits[0])from your GPA example and it works! Thank you so much
– Sergey Khmelevskoy
Nov 15 '18 at 20:29
|
show 3 more comments
Can you post the HTML?
– Minder Mondo
Nov 15 '18 at 19:32
@MinderMondo Thank you for the comment, but html is not a case here. It's a javascript question
– Sergey Khmelevskoy
Nov 15 '18 at 19:40
1
I believe what you're looking for is just a simple Linear Normalization formula. I'd written an answer a while back with a basic JS function that takes input bounds (0and100in your case), the normalized bounds (0.357and1in your case), and the number you'd like to convert (the current percent), to give you the new number. You can see that here.
– Tyler Roper
Nov 15 '18 at 20:13
1
And for some follow-up, I'd actually re-used that same formula in a much more recent answer where someone was trying to convert a test grade (0-100) to a GPA (1.0 - 4.0), if that implementation is more suitable to your specific example.
– Tyler Roper
Nov 15 '18 at 20:22
2
@TylerRoper Exactly what I was looking for, but unable to describe. I've addednormalize(vScroll, topHeight, 0, logoLimits[1], logoLimits[0])from your GPA example and it works! Thank you so much
– Sergey Khmelevskoy
Nov 15 '18 at 20:29
Can you post the HTML?
– Minder Mondo
Nov 15 '18 at 19:32
Can you post the HTML?
– Minder Mondo
Nov 15 '18 at 19:32
@MinderMondo Thank you for the comment, but html is not a case here. It's a javascript question
– Sergey Khmelevskoy
Nov 15 '18 at 19:40
@MinderMondo Thank you for the comment, but html is not a case here. It's a javascript question
– Sergey Khmelevskoy
Nov 15 '18 at 19:40
1
1
I believe what you're looking for is just a simple Linear Normalization formula. I'd written an answer a while back with a basic JS function that takes input bounds (
0 and 100 in your case), the normalized bounds (0.357 and 1 in your case), and the number you'd like to convert (the current percent), to give you the new number. You can see that here.– Tyler Roper
Nov 15 '18 at 20:13
I believe what you're looking for is just a simple Linear Normalization formula. I'd written an answer a while back with a basic JS function that takes input bounds (
0 and 100 in your case), the normalized bounds (0.357 and 1 in your case), and the number you'd like to convert (the current percent), to give you the new number. You can see that here.– Tyler Roper
Nov 15 '18 at 20:13
1
1
And for some follow-up, I'd actually re-used that same formula in a much more recent answer where someone was trying to convert a test grade (0-100) to a GPA (1.0 - 4.0), if that implementation is more suitable to your specific example.
– Tyler Roper
Nov 15 '18 at 20:22
And for some follow-up, I'd actually re-used that same formula in a much more recent answer where someone was trying to convert a test grade (0-100) to a GPA (1.0 - 4.0), if that implementation is more suitable to your specific example.
– Tyler Roper
Nov 15 '18 at 20:22
2
2
@TylerRoper Exactly what I was looking for, but unable to describe. I've added
normalize(vScroll, topHeight, 0, logoLimits[1], logoLimits[0]) from your GPA example and it works! Thank you so much– Sergey Khmelevskoy
Nov 15 '18 at 20:29
@TylerRoper Exactly what I was looking for, but unable to describe. I've added
normalize(vScroll, topHeight, 0, logoLimits[1], logoLimits[0]) from your GPA example and it works! Thank you so much– Sergey Khmelevskoy
Nov 15 '18 at 20:29
|
show 3 more comments
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Can you post the HTML?
– Minder Mondo
Nov 15 '18 at 19:32
@MinderMondo Thank you for the comment, but html is not a case here. It's a javascript question
– Sergey Khmelevskoy
Nov 15 '18 at 19:40
1
I believe what you're looking for is just a simple Linear Normalization formula. I'd written an answer a while back with a basic JS function that takes input bounds (
0and100in your case), the normalized bounds (0.357and1in your case), and the number you'd like to convert (the current percent), to give you the new number. You can see that here.– Tyler Roper
Nov 15 '18 at 20:13
1
And for some follow-up, I'd actually re-used that same formula in a much more recent answer where someone was trying to convert a test grade (0-100) to a GPA (1.0 - 4.0), if that implementation is more suitable to your specific example.
– Tyler Roper
Nov 15 '18 at 20:22
2
@TylerRoper Exactly what I was looking for, but unable to describe. I've added
normalize(vScroll, topHeight, 0, logoLimits[1], logoLimits[0])from your GPA example and it works! Thank you so much– Sergey Khmelevskoy
Nov 15 '18 at 20:29