calculate a number without a variable in javascript

Given this code:

if(ipadmenuheight < contentheight).css('top', '' + contentheight + 44 + 'px');

Let's say contentheight=500

then this code snippet returns 50044px. How can it be a sum instead and return 544px?

Do I need开发者_StackOverflow社区 to use a variable or can I do this inline?

Use a parenthesis to sum both numbers. If not, they will be appended as strings:

...css('top', (contentheight + 44) + 'px');

By the way, the first empty string '' is not needed, so you could also do:

...css('top', contentheight + 44 + 'px');

Use parentheses to force numerical addition:

('top', '' + (contentheight + 44) + 'px');

or just take off the leading string.

('top', contentheight + 44 + 'px');

Try

if(ipadmenuheight < contentheight).css('top', '' + (contentheight + 44) + 'px');

or eventually

if(ipadmenuheight < contentheight).css('top', '' + (parseInt(contentheight, 10) + 44) + 'px');

if contentheight is a string.