jQuery UI Slider logarithmic scale
12,206
Solution 1
I found the solution here: Logarithmic slider
I've used your very helpful code for a project... this is what I have:
var gMinPrice = 100;
var gMaxPrice = 1000; //in my project these are dynamic
function expon(val){
var minv = Math.log(gMinPrice);
var maxv = Math.log(gMaxPrice);
var scale = (maxv-minv) / (gMaxPrice-gMinPrice);
return Math.exp(minv + scale*(val-gMinPrice));
}
function logposition(val){
var minv = Math.log(gMinPrice);
var maxv = Math.log(gMaxPrice);
var scale = (maxv-minv) / (gMaxPrice-gMinPrice);
return (Math.log(val)-minv) / scale + gMinPrice;
}
I then change my slider positions using this code:
var gBudgetBottom, gBudgetTop;
$('#priceSlider').slider({
change: function(event, ui){ // inside your slider instance
gBudgetBottom = Number(expon(ui.values[0])).toFixed(0);
gBudgetTop = Number(expon(ui.values[1])).toFixed(0);
}
}
$('#priceSlider').slider({ values: [Number(logposition(gBudgetBottom)).toFixed(0), Number(logposition(gBudgetTop)).toFixed(0)] });
I hope that works for you :)
Solution 2
This is what i did:
var resStepValues = [0, .01, .02, .03, .04, .05, 1, 1.5, 2, 3, 4, 5, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250, 300, 500, 750, 1000, 1500];
var slider = $("#resolution_slider").slider({
animate: true,
min: 0,
max: 29,
range: 'min',
values: [0, 29],
slide: function (event, ui) {
if (ui.values[0] > ui.values[1]) {
$("#txtMaxRes").val(resStepValues[ui.values[1]]);
$("#txtMinRes").val(resStepValues[ui.values[0]]);
} else {
$("#txtMaxRes").val(resStepValues[ui.values[0]]);
$("#txtMinRes").val(resStepValues[ui.values[1]]);
}
}
});
Author by
Taras Bulgakov
Updated on July 18, 2022Comments
-
Taras Bulgakov almost 2 years
I'm using this jQuery UI code use for a logarithmic slider:
var minVal = 10; var maxVal = 100; $("#slider").slider({ range: true, min: minVal, max: maxVal / 2, values: [minVal, maxVal], slide: function(event, ui) { $("#amount_min").val(Number(expon(ui.values[0], minVal, maxVal)).toFixed(0)); $("#amount_max").val(Number(expon(ui.values[1], minVal, maxVal)).toFixed(0)); } });
The
expon
function is:function expon(val, min,max) { var minv = Math.log(min); var maxv = Math.log(max); max = max / 2; // calculate adjustment factor var scale = (maxv - minv) / (max - min); return Math.exp(minv + scale * (val - min)); }
#amount_min
and#amount_max
are HTML input elements. The code above works just fine to get values from the slider and to put them to the input elements.But now I need the function opposite to
expon()
— to change the slider when I change the values of the inputs. Can anybody help me with this? -
IMSoP about 11 yearsYou should mark your answer as "accepted", so that it's clear to people coming upon the question that this was the solution.
-
BBagi about 11 yearsThis should be the solution. Simple and elegant.