Using Jquery variables for calculations and they do not work with numerical values

Hey there, I'm new to this so bear with me. I have a jQuery question that's puzzling me...

I'm attempting to set the line height using the following method:

var line_height = $('.container').css("height"); 
console.log(line_height); 
$('.vertical-line').height(line_height - 1000);

However, for some reason, I'm unable to calculate line_height - 1000 even though line_height should be a number (I confirmed with console.log). Instead of getting the desired result, line_height - 1000 returns NaN.

Any assistance would be greatly appreciated. Thank you!

I've tried a few different approaches but none seem to do the trick...

Option 1:

var line_height = $('.container').css("height"); 
$('.vertical-line').height(line_height);

Option 2:

var line_height = $('.container').css("height");
var h = line_height - 1000; 
$('.vertical-line').height(h);

Option 3:

var line_height = $('.container').css("height") - 1000; 
$('.vertical-line').height(line_height);

Answer №1

The reason for the NaN output is due to the line_height being set to 0px. This results in a calculation error when multiplying a string by a number.

var line_height = $(".container").height();
var adjusted_height = line_height - 1000;
$(".vertical-line").height(adjusted_height);

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