jquery sets box size

In front-end web development, page layout design is a very important task. Among them, the box is the basis of page layout, and its size and style are crucial to the overall effect and user experience of the page. This article will introduce how to use jQuery to set the box size to achieve adaptive and fixed-size effects.

1. jQuery gets the box size

Before setting the box size, you first need to get the box size. jQuery provides multiple methods to obtain the size of the box, including width(), height(), outerWidth(), outerHeight(), innerWidth(), innerHeight(), etc.

1. width() and height() methods

The width() and height() methods are used to obtain the width and height of the element respectively. These two methods return the width and height of the element's content area, excluding padding, border and margin.

Sample code:

$(document).ready(function() {
  var boxWidth = $('#box').width();
  var boxHeight = $('#box').height();
  console.log('boxWidth:' + boxWidth + ', boxHeight:' + boxHeight);
});

2. outerWidth() and outerHeight() methods

outerWidth() and outerHeight() methods are used to obtain the elements respectively outer width and outer height. These two methods return the total width and height of the element's content area plus padding, border, and margin.

Sample code:

$(document).ready(function() {
  var boxOuterWidth = $('#box').outerWidth();
  var boxOuterHeight = $('#box').outerHeight();
  console.log('boxOuterWidth:' + boxOuterWidth + ', boxOuterHeight:' + boxOuterHeight);
});

3. innerWidth() and innerHeight() methods

innerWidth() and innerHeight() methods are used to obtain the elements respectively inner width and inner height. These two methods return the total width and height of the element's content area plus padding, excluding border and margin.

Sample code:

$(document).ready(function() {
  var boxInnerWidth = $('#box').innerWidth();
  var boxInnerHeight = $('#box').innerHeight();
  console.log('boxInnerWidth:' + boxInnerWidth + ', boxInnerHeight:' + boxInnerHeight);
});

2. Set the box size with jQuery

After getting the box size, you can use jQuery to dynamically set the box size. jQuery provides a variety of methods to set the box size, including width(), height(), outerWidth(), outerHeight(), innerWidth(), innerHeight(), etc.

1. width() and height() methods

The width() and height() methods are used to set the width and height of elements respectively. Both methods accept a numeric parameter that specifies the width and height of the element. You can also use percentages as parameters to achieve adaptive effects.

Sample code:

$(document).ready(function() {
  // 设置固定宽度和高度
  $('#box').width(200).height(100);

  // 设置自适应宽度和高度
  $('#box').width('50%').height('50%');
});

2. outerWidth() and outerHeight() methods

outerWidth() and outerHeight() methods are used to set the elements respectively outer width and outer height. These two methods accept a Boolean parameter to specify whether to include padding, border, and margin. You can also use percentages as parameters to achieve adaptive effects.

Sample code:

$(document).ready(function() {
  // 设置固定外宽度和外高度
  $('#box').outerWidth(300, true).outerHeight(150, true);

  // 设置自适应外宽度和外高度
  $('#box').outerWidth('50%', true).outerHeight('50%', true);
});

3. innerWidth() and innerHeight() methods

innerWidth() and innerHeight() methods are used to set the element respectively inner width and inner height. Both methods accept a numeric parameter that specifies the inner width and height of the element. You can also use percentages as parameters to achieve adaptive effects.

Sample code:

$(document).ready(function() {
  // 设置固定内宽度和内高度
  $('#box').innerWidth(260).innerHeight(110);

  // 设置自适应内宽度和内高度
  $('#box').innerWidth('50%').innerHeight('50%');
});

3. Implementation of adaptive and fixed sizes

In actual development, different page layouts require different box size setting methods. Generally speaking, adaptive sizes are suitable for responsive layouts, while fixed sizes are suitable for static layouts. The following describes how to use jQuery to achieve adaptive and fixed size effects.

1. Implementation of adaptive size

Adaptive size usually uses percentages as parameters to implement responsive layout based on the browser window size.

Sample code:

<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8">
  <title>自适应大小的实现</title>
  <style>
    body {
      margin: 0;
      padding: 0;
    }
    #box {
      background-color: #ccc;
      width: 50%;
      height: 50%;
      margin: 0 auto;
    }
  </style>
</head>
<body>
  <div id="box"></div>
  <script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.6.0/jquery.min.js"></script>
  <script>
    $(document).ready(function() {
      $(window).resize(function() {
        $('#box').innerWidth('50%').innerHeight('50%');
      });
    });
  </script>
</body>
</html>

In the above code, the css style is used to set the size of the box, and the innerWidth() and innerHeight() methods are used in jQuery to achieve adaptive size. When the browser window size changes, jQuery will detect the change in window size and recalculate the size of the box.

2. Implementation of fixed size

Fixed size usually uses pixel values ​​as parameters to implement static layout based on the design draft.

Sample code:

<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8">
  <title>固定大小的实现</title>
  <style>
    body {
      margin: 0;
      padding: 0;
    }
    #box {
      background-color: #ccc;
      width: 300px;
      height: 150px;
      margin: 0 auto;
    }
  </style>
</head>
<body>
  <div id="box"></div>
  <script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.6.0/jquery.min.js"></script>
  <script>
    $(document).ready(function() {
      $('#box').width(200).height(100);
    });
  </script>
</body>
</html>

In the above code, CSS styles are used to set the size of the box, and the width() and height() methods are used in jQuery to achieve a fixed size. In jQuery's ready event, set the size of the box to 200px×100px.

To sum up, this article introduces how to use jQuery to set the box size, including getting the box size and setting the box size, and how to achieve adaptive and fixed-size effects. I hope this article will be helpful to beginners in front-end web development.

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