Css - Why console.log is returning different value than alert?

User123456
July 14, 2023
374 views
1 vote
2 Answers

console.log and alert returning different values. Code is regarding to find Computed Style of left property.

$(document).ready(function() {
  const smallDevice = window.matchMedia("(max-width: 1490px)");
  smallDevice.addListener(handleDeviceChange);

  function handleDeviceChange(e) {
    if (e.matches) {
      const left = $(".sidebar").css("left");
      alert(left);
      console.log(left);
    }
  }
});

@media (max-width: 1490px) {
  .sidebar2 {
    right: -300px !important;
  }
  .sidebar {
    left: -300px !important;
  }
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<aside class="sidebar" id="sidebar">
  <ul class="sidebar-nav" id="sidebar-nav">
    <li class="nav-item">
      <a class="nav-link">
        <img class="logo" src="https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcR3pZ-gZavZ--zmy5TluKQHw-5aKDXYlrnnbQ&usqp=CAU" />
      </a>
    </li>
    <li class="nav-item">
      <a class="nav-link">
        <i class="bi- bi-calendar-event "></i>
        <span>الأحداث</span>
      </a>
    </li>
    <li class="nav-item">
      <a class="nav-link">
        <i class="bi- bi-newspaper "></i>
        <span>الأخبار</span>
      </a>
    </li>
  </ul>
</aside>

<aside class="sidebar2" id="sidebar2">
  <ul class="sidebar-nav" id="sidebar-nav">
    <li class="nav-item">
      <a class="nav-link">
        <img class="logo" src="https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcR3pZ-gZavZ--zmy5TluKQHw-5aKDXYlrnnbQ&usqp=CAU" />
      </a>
    </li>
    <li class="nav-item">
      <a class="nav-link">
        <i class="bi- bi-calendar-event "></i>
        <span>الأحداث</span>
      </a>
    </li>
    <li class="nav-item">
      <a class="nav-link">
        <i class="bi- bi-newspaper "></i>
        <span>الأخبار</span>
      </a>
    </li>
  </ul>
</aside>

Tags: css javascript

Answers

I think your code is mostly correct, but you are using id selector instead of class selector.

Also, you need to use e.matches instead of smallDevice.matches.

This code works fine:

$(document).ready(function () {
    const smallDevice = window.matchMedia("(max-width: 1490px)");
    smallDevice.addListener(handleDeviceChange);
    function handleDeviceChange(e) {
      if (e.matches) {
        const left = $(".sidebar").css("left");
        console.log(left);
        alert(left);
      }
    }
  });

@media (max-width: 1490px) {
  .sidebar2 {
    right: -300px !important;
  }

  .sidebar {
    left: -300px !important;
  }
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="sidebar"></div>
<div class="sidebar2"></div>

With addEventListener, It returns the same values in alert and console.log

const smallDevice = window.matchMedia("(max-width: 1490px)");

smallDevice.addEventListener("change", handleDeviceChange);

function handleDeviceChange(e) {
  if (e.matches) {
    const el = document.querySelector(".sidebar")
    const left = getComputedStyle(el)['left']
    console.log(left);
    alert(left)
  }
}

@media (max-width: 1490px) {
  .sidebar2 {
    right: -300px !important;
  }
  .sidebar {
    left: -300px !important;
  }
}

<div class="sidebar"></div>
<div class="sidebar2"></div>

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Css – Why console.log is returning different value than alert?

Answers