Input valueAsNumber

Date:


Every once in a while I learn about a JavaScript property that I wish I had known about years earlier — valueAsNumber is one of them. The valueAsNumber provides the value of an input[type=number] as a Number type, instead of the traditional string representation when you get the value:

/*
 Assuming an <input type="number" value="1.234" />
*/

// BAD: Get the value and convert the number
input.value // "1.234"
const numberValue = parseFloat(input.value, 10);

// GOOD: Use valueAsNumber
input.valueAsNumber // 1.234

This property allows us to avoid parseInt/parseFloat, but one gotcha with valueAsNumber is that it will return NaN if the input is empty.

Thank you to Steve Sewell for making me aware of valueAsNumber!

  • An Interview with Eric Meyer

    Your early CSS books were instrumental in pushing my love for front end technologies. What was it about CSS that you fell in love with and drove you to write about it? At first blush, it was the simplicity of it as compared to the table-and-spacer…

  • CSS Gradients

    With CSS border-radius, I showed you how CSS can bridge the gap between design and development by adding rounded corners to elements.  CSS gradients are another step in that direction.  Now that CSS gradients are supported in Internet Explorer 8+, Firefox, Safari, and Chrome…

  • Introducing MooTools ScrollSide

    This post is a proof of concept post — the functionality is yet to be perfected. Picture this: you’ve found yourself on a website that uses horizontal scrolling instead of vertical scrolling. It’s an artistic site so you accept that the site scrolls left to right.

  • CSS Background Animations


Source link

Share post:

[tds_leads title_text="Subscribe" input_placeholder="Email address" btn_horiz_align="content-horiz-center" pp_checkbox="yes" pp_msg="SSd2ZSUyMHJlYWQlMjBhbmQlMjBhY2NlcHQlMjB0aGUlMjAlM0NhJTIwaHJlZiUzRCUyMiUyMyUyMiUzRVByaXZhY3klMjBQb2xpY3klM0MlMkZhJTNFLg==" f_title_font_family="653" f_title_font_size="eyJhbGwiOiIyNCIsInBvcnRyYWl0IjoiMjAiLCJsYW5kc2NhcGUiOiIyMiJ9" f_title_font_line_height="1" f_title_font_weight="700" f_title_font_spacing="-1" msg_composer="success" display="column" gap="10" input_padd="eyJhbGwiOiIxNXB4IDEwcHgiLCJsYW5kc2NhcGUiOiIxMnB4IDhweCIsInBvcnRyYWl0IjoiMTBweCA2cHgifQ==" input_border="1" btn_text="I want in" btn_tdicon="tdc-font-tdmp tdc-font-tdmp-arrow-right" btn_icon_size="eyJhbGwiOiIxOSIsImxhbmRzY2FwZSI6IjE3IiwicG9ydHJhaXQiOiIxNSJ9" btn_icon_space="eyJhbGwiOiI1IiwicG9ydHJhaXQiOiIzIn0=" btn_radius="3" input_radius="3" f_msg_font_family="653" f_msg_font_size="eyJhbGwiOiIxMyIsInBvcnRyYWl0IjoiMTIifQ==" f_msg_font_weight="600" f_msg_font_line_height="1.4" f_input_font_family="653" f_input_font_size="eyJhbGwiOiIxNCIsImxhbmRzY2FwZSI6IjEzIiwicG9ydHJhaXQiOiIxMiJ9" f_input_font_line_height="1.2" f_btn_font_family="653" f_input_font_weight="500" f_btn_font_size="eyJhbGwiOiIxMyIsImxhbmRzY2FwZSI6IjEyIiwicG9ydHJhaXQiOiIxMSJ9" f_btn_font_line_height="1.2" f_btn_font_weight="700" f_pp_font_family="653" f_pp_font_size="eyJhbGwiOiIxMyIsImxhbmRzY2FwZSI6IjEyIiwicG9ydHJhaXQiOiIxMSJ9" f_pp_font_line_height="1.2" pp_check_color="#000000" pp_check_color_a="#ec3535" pp_check_color_a_h="#c11f1f" f_btn_font_transform="uppercase" tdc_css="eyJhbGwiOnsibWFyZ2luLWJvdHRvbSI6IjQwIiwiZGlzcGxheSI6IiJ9LCJsYW5kc2NhcGUiOnsibWFyZ2luLWJvdHRvbSI6IjM1IiwiZGlzcGxheSI6IiJ9LCJsYW5kc2NhcGVfbWF4X3dpZHRoIjoxMTQwLCJsYW5kc2NhcGVfbWluX3dpZHRoIjoxMDE5LCJwb3J0cmFpdCI6eyJtYXJnaW4tYm90dG9tIjoiMzAiLCJkaXNwbGF5IjoiIn0sInBvcnRyYWl0X21heF93aWR0aCI6MTAxOCwicG9ydHJhaXRfbWluX3dpZHRoIjo3Njh9" msg_succ_radius="2" btn_bg="#ec3535" btn_bg_h="#c11f1f" title_space="eyJwb3J0cmFpdCI6IjEyIiwibGFuZHNjYXBlIjoiMTQiLCJhbGwiOiIxOCJ9" msg_space="eyJsYW5kc2NhcGUiOiIwIDAgMTJweCJ9" btn_padd="eyJsYW5kc2NhcGUiOiIxMiIsInBvcnRyYWl0IjoiMTBweCJ9" msg_padd="eyJwb3J0cmFpdCI6IjZweCAxMHB4In0="]
spot_imgspot_img

Popular

More like this
Related

Mashed Potato Biscuits Recipe (5 Ingredients, 22 Minutes)

If there's one thing I will do...

Coventry host Sheff Utd | Seven EFL games LIVE on Sky Sports+

Coventry host Sheff Utd | Seven EFL games...

World’s Oldest Alphabet Discovered | Scientific American

November 22, 20243 min readWorld's Oldest Alphabet Found...

Calculating NOI for Real Estate and How to Start Investing with $70K

Want to estimate your NOI (net operating income)...