flex

Description
Syntax
Examples
Links

Description

The flex property for CSS is shorthand for flex-grow, flex-shrink, and flex-basis.

Syntax

CSS

flex: value;

JS

object.style.flex = "value";

Values

<'flex'> = none | [ <'flex-grow'> <'flex-shrink'>? || <'flex-basis'> ]

none

Expands to 0 0 auto.

<'flex-grow'> = <number [0,∞]>

<number [0,∞]>

An integer or zero or more decimal digits followed by a dot (.) followed by one or more decimal digits. The first character may be preceded by a positive sign (+). The last character may be succeeded by an exponent (e or E) and an integer.

<'flex-shrink'> = <number [0,∞]>

<number [0,∞]>

<'flex-basis'> = content | <'width'>

content

Indicates an automatic size based on the flex item's content.

<'width'> = auto | <length-percentage> | min-content | max-content | fit-content( <length-percentage> )

auto

Automatically specified by the user agent.

<length-percentage> =
    <length> |
    <percentage>

<length>

Specifies the length using a number followed by a unit of measurement.

<percentage>

Specifies the percentage using a number followed by a percent sign (%).

min-content

Represents the largest min-content contribution of the items occupying the track.

max-content

Represents the largest max-content contribution of the items occupying the track.

fit-content()

Represents the formula max(minimum, min(limit, max-content)), where minimum represents an auto minimum (which is often, but not always, equal to a min-content minimum), and limit is the track sizing function passed as an argument to fit-content(). This is essentially calculated as the smaller of minmax(auto, max-content) and minmax(auto, limit).

Initial

0 1 auto

Examples

1 · flex-basis · auto

2 · flex-basis · content

3 · flex-basis · length

4 · flex-basis · max-content

5 · flex-basis · min-content

6 · flex-basis · percentage

7 · flex-grow

8 · flex-shrink

9 · none

10 · JS

<!doctype html>
<html>
<head>
    <style>
        .myclass
        {
            display: flex;
        }
        .myclass > div
        {
            background-image: linear-gradient(135deg, white, lightgray);
        }
        .myclass > div:nth-of-type(1)
        {
            background-image: linear-gradient(135deg, white, yellow);
        }
    </style>
</head>
<body>
    <button>initial</button>
    <button value="0 1 auto">auto</button>
    <button value="0 1 content">content</button>
    <button value="0 1 100px">length</button>
    <button value="0 1 max-content">max-content</button>
    <button value="0 1 min-content">min-content</button>
    <button value="0 1 20%">percentage</button>
    <button value="1 1 auto, 2">flex-grow</button>
    <button value="0 1 25%, 2">flex-shrink</button>
    <button>none</button>
    <div class="myclass">
        <div>flex</div>
        <div>flex</div>
        <div>flex</div>
        <div>flex</div>
        <div>flex</div>
    </div>
    <script>
        function myfunction(myparameter)
        {
            const mytarget = myparameter.target;
            const myproperty = mytarget.value || mytarget.innerHTML;
            for(const mydiv1 of document.querySelectorAll(".myclass > div"))
            {
                mydiv1.style.flex = myproperty;
                if(myproperty.includes(","))
                {
                    const mysplit = myproperty.split(",");
                    mydiv1.style.flex = mysplit[0];
                    const mydiv2 = document.querySelector(".myclass > div");
                    if(mytarget.innerHTML == "flex-grow")
                    {
                        mydiv2.style.flexGrow = mysplit[1];
                    }
                    else if(mytarget.innerHTML == "flex-shrink")
                    {
                        mydiv2.style.flexShrink = mysplit[1];
                    }
                }
            }
        }
        for(const mybutton of document.querySelectorAll("button"))
        {
            mybutton.addEventListener("mouseover", myfunction);
        }
    </script>
</body>
</html>