flexbox 防止换行

Question

I have the following snippet in which when you click one of the red boxes, its width doubles in size. The functionality that I want to achieve is that when the width increases, the other boxes in that row shrink to stop the wrapping of a box to a new 3rd line.

 $('.card').click(function() { if ($('.card.selected')[0] != this) $('.card.selected').toggleClass('selected', false); $(this).toggleClass('selected'); })

 section { display: flex; flex: 1 1 100%; flex-wrap: wrap; flex-direction: row; justify-content: flex-start; width: 100%; } .card { display: block; width: calc(25% - 2px); height: 40px; background-color: #f00; margin: 1px; -webkit-transition: .15s; transition: width .15s; } .selected { width: calc(50% - 2px); }

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <section> <div class="card"></div> <div class="card"></div> <div class="card"></div> <div class="card"></div> <div class="card"></div> <div class="card"></div> <div class="card"></div> <div class="card"></div> </section>

I am able to achieve the desired functionality by literally wrapping each row in individual flexboxs, however I want to know if there is a css approach which will not require this. The reason being that the boxes are being dynamically toggled on and off, and I want them to "flow" as you would expect and explicitly defining the rows makes this much more awkward.

Answer 1

If you have 2 or maximum 3 rows, you can use pseudo :before and/or :after to force new lines. flex:1; should evenly dispatch the children on each rows. You can also use a min-width to easily add a transition.

This technic allows you to draw 3 rows without extra markup. to draw more rows, use a new container or insert elements to break the lines the same way the pseudo does.

example with 2 rows

 section { display:flex; flex-wrap:wrap; } div { flex:1; min-width:calc(16.66% - 2px); transition:0.5s; margin:auto; height: 40px; background-color: #f00; margin: 1px; -webkit-transition: 0.15s; transition: width 0.15s; order:0; } div:nth-child(4)~div {/* every div starting from the fith */ order:2; } section:before{ content:''; width:100%; /* fill a whole row */ order:1;/* comes before the fith div*/ } div:focus {/* css demo purpose instead js onclick event */ min-width:calc(50% - 2px); transition:0.5s; background-color:yellow } div {display:flex;align-items:center;justify-content:center;} section {counter-reset: div} section div:before {counter-increment:div;content:'DIV N°: 'counter(div);}

 <section> <div tabindex="0"></div> <div tabindex="0"></div> <div tabindex="0"></div> <div tabindex="0"></div> <div tabindex="0"></div> <div tabindex="0"></div> <div tabindex="0"></div> <div tabindex="0"></div> </section>

example with 3 rows :

 section { display:flex; flex-wrap:wrap; } div { flex:1; min-width:calc(16.66% - 2px); transition:0.5s; margin:auto; height: 40px; background-color: #f00; margin: 1px; -webkit-transition: 0.15s; transition: width 0.15s; order:0; } div:nth-child(4)~div { order:2; } div:nth-child(8)~div { order:4; } section:before, section:after{ content:''; width:100%; order:1; } section:after { order:3; } div:focus { min-width:calc(50% - 2px); transition:0.5s; background-color:yellow } div {display:flex;align-items:center;justify-content:center;} section {counter-reset: div} section div:before {counter-increment:div;content:'DIV N°: 'counter(div);}

 <section> <div tabindex="0"></div> <div tabindex="0"></div> <div tabindex="0"></div> <div tabindex="0"></div> <div tabindex="0"></div> <div tabindex="0"></div> <div tabindex="0"></div> <div tabindex="0"></div> <div tabindex="0"></div> <div tabindex="0"></div> <div tabindex="0"></div> <div tabindex="0"></div> </section>