Practical methods for implementing absolute positioning strategies

How to meet the requirements of the absolute positioning strategy requires specific code examples

Absolute positioning is a commonly used positioning method in CSS. By using absolute positioning, we can precisely control the position of an element on the page and not be affected by other elements. However, there are some requirements and considerations that need to be met to achieve the effect of absolute positioning. This article explains how to meet the requirements of the absolute positioning strategy and provides some specific code examples.

1. Understand the basic principles of absolute positioning

Before we start writing absolute positioning code, we need to understand the basic principles of absolute positioning. Absolute positioning is positioned relative to its nearest non-statically positioned parent element. If no non-statically positioned parent element is found, it is positioned relative to the body element. By setting the top, bottom, left, and right attributes of the element, you can specify the position of the element on the page.

2. Meet the requirements of absolute positioning strategy

1. Determine the positioning method of the parent element

Before using absolute positioning, you need to ensure the positioning of the parent element The method is not static. Normally, we can set the positioning mode of the parent element to relative, so that the child elements can be positioned relative to the parent element.

Sample code:

.parent {
  position: relative;
}

2. Set the positioning attribute of the child element

By setting the positioning attribute of the child element, we can control the position of the element on the page specific location.

Sample code:

.child {
  position: absolute;
  top: 50px;
  left: 100px;
}

In the above code, we set the positioning attribute of the child element to absolute, and specify the distance between the element and the top and left borders of the parent element through the top and left attributes respectively. distance.

3. Adjust the stacking order of child elements

When there are multiple absolutely positioned elements on the page, overlap may occur. To solve this problem, we can control the display order of elements by adjusting their stacking order.

Sample code:

.child {
  position: absolute;
  top: 50px;
  left: 100px;
  z-index: 1;
}

In the above code, we set the stacking order of the child element to 1. If the stacking order of other elements is smaller than 1, then the child element will be in the other elements above.

3. Practical application cases of absolute positioning

1. Fixed position of the navigation bar

In web design, the navigation bar usually needs to be fixed on the page A certain position that does not move as the page scrolls. By using absolute positioning, we can achieve this effect.

Sample code:

.navbar {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 50px;
}

In the above code, we set the positioning property of the navigation bar to absolute, and set the top and left properties to 0 to fix it at the top of the page.

2. The floating effect of pictures

In web design, we often use the floating effect of pictures to increase user interactivity. By using absolute positioning, we can achieve some special effects when the image is hovered by the mouse.

Sample code:

.image {
  position: relative;
}

.image:hover {
  transform: scale(1.2);
}

In the above code, we set the positioning attribute of the image container to relative, and use the CSS transform attribute to achieve the magnification effect of the image when the image container is suspended. .

Summary:

This article introduces how to meet the requirements of the absolute positioning strategy and provides some specific code examples. By using absolute positioning, we can flexibly control the position of elements on the page and achieve a variety of effects. I hope this article helps you when using absolute positioning.

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