getElementById（）。style.display不起作用

Question

I made some js code for <div> to appear or disappear.

[src.js]

openSearch = () => {
    var con = document.getElementById("search-bar");
    if(con.style.display == 'none') {
        con.style.display = 'block';
    } else {
        con.style.display = 'none';
    }
}

[style.css]

#search-bar {
    position: absolute;
    height: 4em;
    width: 20em;
    background-color: white;
    border: 1px solid black;
    padding: 1.5rem;
    right: 0;
    display: none;
}

and add onclick="openSearch()" to <a> tag.

When I click the <a> tag first time, it doesn't work anything.

But click again, it works properly.

So I tried to console.log(document.getElementById("search-bar").style.display, it throws ""(blank).

I wonder that I defined display: none to search-bar but why initial style.display of search-bar is blank value?

And how can I fix it?

Answer 1

Alternatively, you can move the display style to another class and can toggle class.

 openSearch = () => { var con = document.getElementById("search-bar"); con.classList.toggle("hidden"); } 

 #search-bar { position: absolute; height: 4em; width: 20em; background-color: white; border: 1px solid black; padding: 1.5rem; right: 0; } .hidden { display: none; } 

  <a onclick="openSearch()">Toggle</a> <div id="search-bar" class="hidden">Some text here</div> 

Answer 2

function openSearch()
 {
       var div = document.getElementById("search-bar");
       if (div.style.display !== "none") {
          div.style.display = "none";
        }
      else {
         div.style.display = "block";
       }
 }

Answer 3

You could try initializing the style via js to none:

document.getElementById("search-bar").style.display = 'none';

When the page loads. My guess is that'll work.

Answer 4

[SOLVED]

First I add display: none to css file.

But after style="display: none" to a tag, it works properly.

Maybe I think there is loading priority, But I don't know why exactly.

Answer 5

when you set the display:none in css it innisial like display="" . and not display=none . the result is the same, but if you check display='none' he will return false.. you can try it like this:

openSearch = () => {
    var con = document.getElementById("search-bar");
    if(con.style.display == '') {
        con.style.display = 'block';
    } else {
        con.style.display = '';
    }
}

and it will work fine

Answer 6

Use this line code:

if(con.style.display == 'none' || con.style.display == '') {

 openSearch = () => { var con = document.getElementById("search-bar"); if(con.style.display == 'none' || con.style.display == '') { con.style.display = 'block'; } else { con.style.display = 'none'; } } 

 #search-bar { position: absolute; height: 4em; width: 20em; background-color: white; border: 1px solid black; padding: 1.5rem; right: 0; display: none; } 

 <div id="search-bar">My Div</div> <a onclick="openSearch()" href="#">Click</a>