Truncate text inside Twitter Bootstrap v5 Navbar

Question

How to truncate dynamic text(with variable width) inside a nav-link or nav-text in a bootstrap navbar?

P.S.: With explicit width, this code just works fine, ex.: <a class="nav-link disabled text-truncate" style="max-width: 150px;"> but the width is unknown.

The expected behavior, is truncate text on desktop and mobile viewports, no matter which viewport size.

Codepen

<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css" integrity="sha384-rbsA2VBKQhggwzxH7pPCaAqO46MgnOM80zW1RWuH61DGLwZJEdK2Kadq2F9CUG65" crossorigin="anonymous">

<nav class="navbar navbar-expand-lg bg-body-tertiary">
  <div class="container-fluid">
    <a class="navbar-brand" href="#">Navbar</a>
    <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
      <span class="navbar-toggler-icon"></span>
    </button>
    <div class="collapse navbar-collapse" id="navbarSupportedContent">
      <ul class="navbar-nav me-auto mb-2 mb-lg-0">
        <li class="nav-item">
          <a class="nav-link active" aria-current="page" href="#">Home</a>
        </li>
        <li class="nav-item">
          <a class="nav-link" href="#">Link</a>
        </li>
        <li class="nav-item dropdown">
          <a class="nav-link dropdown-toggle" href="#" role="button" data-bs-toggle="dropdown" aria-expanded="false">
            Dropdown
          </a>
          <ul class="dropdown-menu">
            <li><a class="dropdown-item" href="#">Action</a></li>
            <li><a class="dropdown-item" href="#">Another action</a></li>
            <li>
              <hr class="dropdown-divider">
            </li>
            <li><a class="dropdown-item" href="#">Something else here</a></li>
          </ul>
        </li>
        <li class="nav-item">
          <a class="nav-link disabled text-truncate">long long long long long long long long long long long long long long long long long long long long long long long long long long long text</a>
        </li>
      </ul>
      <div class="d-flex" role="search">
        <input class="form-control me-2" type="search" placeholder="Search" aria-label="Search">
        <button class="btn btn-outline-success" type="submit">Search</button>
      </div>
    </div>
  </div>
</nav>

<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/js/bootstrap.bundle.min.js" integrity="sha384-kenU1KFdBIe4zVF0s0G1M5b4hcpxyD9F7jL+jjXkk+Q2h455rYXK/7HAuoJl+0I4" crossorigin="anonymous"></script>

I've tried @isherwood suggestions, but without success:

First:

.flex-parent,
.flex-parent-parent,
.flex-parent-parent-parent {
  display: flex;
  padding: 10px;
  border: solid;
  min-width: 100px;
}

.flex-parent {
  min-width: 0;
}

.long-and-truncated {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css" integrity="sha384-rbsA2VBKQhggwzxH7pPCaAqO46MgnOM80zW1RWuH61DGLwZJEdK2Kadq2F9CUG65" crossorigin="anonymous">

<nav class="navbar navbar-expand-lg bg-body-tertiary">
  <div class="container-fluid">
    <a class="navbar-brand" href="#">Navbar</a>
    <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
      <span class="navbar-toggler-icon"></span>
    </button>
    <div class="collapse navbar-collapse" id="navbarSupportedContent">
      <ul class="navbar-nav me-auto mb-2 mb-lg-0">
        <li class="nav-item">
          <a class="nav-link active" aria-current="page" href="#">Home</a>
        </li>
        <li class="nav-item">
          <a class="nav-link" href="#">Link</a>
        </li>
        <li class="nav-item dropdown">
          <a class="nav-link dropdown-toggle" href="#" role="button" data-bs-toggle="dropdown" aria-expanded="false">
            Dropdown
          </a>
          <ul class="dropdown-menu">
            <li><a class="dropdown-item" href="#">Action</a></li>
            <li><a class="dropdown-item" href="#">Another action</a></li>
            <li>
              <hr class="dropdown-divider">
            </li>
            <li><a class="dropdown-item" href="#">Something else here</a></li>
          </ul>
        </li>
        <li class="nav-item">
          <div class="flex-parent-parent-parent">
            <div class="flex-parent-parent">
              <div class="flex-parent">
                <div class="flex-child long-and-truncated">
                  1. This is a loooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooong string that is OK to truncate please and thank you
                </div>
              </div>
            </div>
          </div>

        </li>
      </ul>
      <div class="d-flex" role="search">
        <button class="btn btn-outline-success">Search</button>
      </div>
    </div>
  </div>
</nav>

<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/js/bootstrap.bundle.min.js" integrity="sha384-kenU1KFdBIe4zVF0s0G1M5b4hcpxyD9F7jL+jjXkk+Q2h455rYXK/7HAuoJl+0I4" crossorigin="anonymous"></script>

Second:

.wrapper {
  display: flex;
  /*   width: 200px; */
  align-content: stretch;
  padding: 5px;
  min-width: 0;
  border: 1px solid
}

.wrapper .child2 {
  flex-grow: 1;
  overflow: hidden;
}

.flex {
  display: flex;
  min-width: 0;
}

.el {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.child1 {
  background: red;
}

.child2 {
  background: lightblue;
}

.child3 {
  background: green;
}

.wrapper>* {
  padding: 5px;
}

<link href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css" rel="stylesheet" />

<nav class="navbar navbar-expand-lg bg-body-tertiary">
  <div class="container-fluid">
    <a class="navbar-brand" href="#">Navbar</a>
    <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
  <span class="navbar-toggler-icon"></span>
</button>
    <div class="collapse navbar-collapse" id="navbarSupportedContent">
      <ul class="navbar-nav me-auto mb-2 mb-lg-0">
        <li class="nav-item">
          <a class="nav-link active" aria-current="page" href="#">Home</a>
        </li>
        <li class="nav-item">
          <a class="nav-link" href="#">Link</a>
        </li>
        <li class="nav-item dropdown">
          <a class="nav-link dropdown-toggle" href="#" role="button" data-bs-toggle="dropdown" aria-expanded="false">
        Dropdown
      </a>
          <ul class="dropdown-menu">
            <li><a class="dropdown-item" href="#">Action</a></li>
            <li><a class="dropdown-item" href="#">Another action</a></li>
            <li>
              <hr class="dropdown-divider">
            </li>
            <li><a class="dropdown-item" href="#">Something else here</a></li>
          </ul>
        </li>
        <li class="nav-item">

          <div class="wrapper">
            <div class="child1">child1</div>
            <div class="child2">
              <div class="flex">
                <div class="el">long long long long long long long long long long long long long long long long long long long long text</div>
                <div>a</div>
              </div>
            </div>
            <div class="child3">child3</div>
          </div>

        </li>
      </ul>
      <div class="d-flex" role="search">
        <button class="btn btn-outline-success">Search</button>
      </div>
    </div>
  </div>
</nav>

<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/js/bootstrap.bundle.min.js"></script>

Both(apparently) need a explicit width to truncate text. My text come from API, and have no length restriction, that cause in a layout mess.

Answer 1

Adding grid to wrapper class will work

.wrapper{
  display: grid;
  align-content: stretch;
  padding: 5px;
  min-width: 0;
  border: 1px solid
}