单击元素外的任意位置时删除类

Question

I am a first-year BSIT student. Although web development isn't taught (at least not yet) in our program, I am trying to self-learn HTML , CSS , JavaScript , and the list goes on.

So the thing is, I'm trying to make border-bottom animate in both ways using CSS transition. I don't quite get event listeners and its event types yet, so I was hoping I could learn if I asked here. The codes are:

 var inputFieldtrigger = document.getElementById("searchFld"); var inputFieldtarget = document.getElementById("border-bottom"); inputFieldtrigger.onclick = function(){ inputFieldtarget.classList.add('searchTransition'); } window.addEventListener('click', function(event){ if (event.target == inputFieldtrigger){ inputFieldtarget.classList.remove('searchTransition') } })

 div.searchfield{ margin:-10px 30px; padding:0; width:auto; } .inputfield { padding-top:10px; font-family: Calibri; font-size: 16px; color:black; text-align:left; box-sizing: border-box; width:60%; border: none; border-bottom: 1px solid blacsk; background:transparent; } .inputfield:focus { outline:none; } .inputfield:focus::placeholder{ opacity:0%; } .borderbtm{ border-bottom:1px solid black; width:0px; transition: width .25s ease-in-out; } .searchTransition { width:220px; }

 <div class="searchfield"> <form action="index.html?"> <input id="searchFld" class="inputfield" autocomplete="off" placeholder="Input product name..."> <div id="border-bottom" class="borderbtm"></div> </form> </div>

I want it to run the reverse transition when I click anywhere outside the input field. I was only able to trigger the onclick transition, but not the reversed.

I would appreciate it if you'd do it in vanilla JS. I am still very unfamiliar with jQuery . Thank you!

Answer 1

There is no need to use JavaScript for this simple thing.

Using only CSS, we can accomplish this enough.

On the following snippet, I have added two new styles.

.inputfield:focus + .borderbtm { width: 200px; } .inputfield:focus + .borderbtm { width: 200px; } - This will set the width of #border-bottom selector when the input selector is focused.

.inputfield:blur + .borderbtm { width: 0px; } .inputfield:blur + .borderbtm { width: 0px; } - This will set back the width of #border-bottom selector when the input selector loses focus. (So the user clicked outside of input .)

 div.searchfield { margin: -10px 30px; padding: 0; width: auto; } .inputfield { padding-top: 10px; font-family: Calibri; font-size: 16px; color: black; text-align: left; box-sizing: border-box; width: 60%; border: none; border-bottom: 1px solid blacsk; background: transparent; } .inputfield:focus { outline: none; } .inputfield:focus::placeholder { opacity: 0%; } .borderbtm { border-bottom: 1px solid black; width: 0px; transition: width .25s ease-in-out; } .inputfield:focus + .borderbtm { width: 200px; } .inputfield:blur + .borderbtm { width: 0px; }

 <div class="searchfield"> <form action="index.html?"> <input id="searchFld" class="inputfield" autocomplete="off" placeholder="Input product name..."> <div id="border-bottom" class="borderbtm"></div> </form> </div>

Answer 2

You could use document instead of a window to listen for a click event on the DOM.

Also, you need to check if its false then remove class. Currently you are just checking if its truthy which means - your if condition never executes .

document.addEventListener('click', function(event) {
   if (event.target != inputFieldtrigger) {
     inputFieldtarget.classList.remove('searchTransition')
    }
})

Working Demo: Vanilla JS

 var inputFieldtrigger = document.getElementById("searchFld"); var inputFieldtarget = document.getElementById("border-bottom"); inputFieldtrigger.onclick = function() { inputFieldtarget.classList.add('searchTransition'); } document.addEventListener('click', function(event) { if (event.target != inputFieldtrigger) { inputFieldtarget.classList.remove('searchTransition') } })

 div.searchfield { margin: -10px 30px; padding: 0; width: auto; } .inputfield { padding-top: 10px; font-family: Calibri; font-size: 16px; color: black; text-align: left; box-sizing: border-box; width: 60%; border: none; border-bottom: 1px solid blacsk; background: transparent; } .inputfield:focus { outline: none; } .inputfield:focus::placeholder { opacity: 0%; } .borderbtm { border-bottom: 1px solid black; width: 0px; transition: width .25s ease-in-out; } .searchTransition { width: 220px; }

 <div class="searchfield"> <form action="index.html?"> <input id="searchFld" class="inputfield" autocomplete="off" placeholder="Input product name..."> <div id="border-bottom" class="borderbtm"></div> </form> </div>