Vue advanced: CSS static positioning, relative positioning, absolute positioning, fixed positioning usage and differences

No Silver Bullet 2020-11-13 07:28:47
vue advanced css static positioning


CSS Provides three basic positioning mechanisms : Ordinary flow 、 Floating and positioning ; Through these three ways, the page layout can be realized .

Ordinary flow

The position of an element in a normal stream is determined by the element in (X)HTML The position of the :

  • Block level elements occupy a single line , Arrange from top to bottom in the text stream ;
  • The elements in a row are arranged side by side in a row , When it encounters the edge of the parent element, it will wrap and continue to arrange ;

float

Floating takes elements out of the standard document stream , It doesn't take up the original space , Multiple block level elements can be displayed side by side .

location

Positioning is positioning an element in a certain position , Positioning elements Hierarchy Higher than floating elements ;
By positioning, the element can be offset from its normal position and appear in other positions , Or relative to the parent element 、 Another element even the location of the browser window itself ;
Positioning can place elements anywhere on the page , This is not possible with standard document streaming and floating .
CSS adopt position Attribute sets the positioning method , The corresponding attribute values are as follows :

Property value effect
static Static positioning , The default location method
relative Relative positioning
absolute Absolute positioning
fixed Fixed position

Absolute positioning and fixed positioning can change the elements display attribute , By default, the element is converted to Inline block element .

static Static positioning

Place elements according to the rules of the standard document flow , Basically not ;

relative Relative positioning

Positioning relative to your position in the standard document stream ; The original position still occupies space ;

absolute Absolute positioning

Locate by setting the parent or ancestor element of the location :

  • If the parent or ancestor element is not positioned, it is positioned relative to the page document ;
  • Absolutely positioned elements out of the standard document stream , No longer occupy the original position ;
  • For elements that use absolute positioning, the parent element is generally set to relative positioning ;

fixed Fixed position

  • Positioning relative to the browser's visual window , Position is independent of the parent element ;
  • The element will be fixed in a certain position in the window and will not change with the page scrolling ;

Want to achieve the positioning of elements , It's not enough to just set the positioning mode , Need to combine CSS In order to achieve positioning

attribute effect
left Locate the offset between the left outer margin boundary of an element and the left boundary of its parent element ( The distance between the left edge of the element and the position of the reference element )
right Right edge
top The upper edge
bottom The lower edge

The attribute value can be px、cm、% etc. ; When used, it is generally Horizontal properties (left、right) With vertical properties (top、bottom) Use a combination of ;top And bottom Don't use... At the same time ,left And right Don't use... At the same time .

Relative positioning example :

/* Parent element */
.parent {
width: 400px;
height: 400px;
border: 1px solid gray;
}
/* Two sub elements */
.box1,
.box2 {
width: 200px;
height: 200px;
}
.box1 {
/* Set relative positioning */
position: relative;
/* Relative to the original position of the element from the upper edge 50px */
top: 50px;
/* Relative to the original position, from the left edge 100px */
left: 100px;
background-color: green;
}
.box2 {
background-color: blue;
}
<div class="parent">
<div class="box1"></div>
<div class="box2"></div>
</div>

 Insert picture description here
Absolute positioning example :

/* Parent element */
.parent {
width: 400px;
height: 400px;
/* Parent element set relative positioning */
position: relative;
border: 1px solid gray;
}
/* Two sub elements */
.box1,
.box2 {
width: 200px;
height: 200px;
}
.box1 {
background-color: red;
}
.box2 {
/* Set absolute positioning */
position: absolute;
/* From the upper edge of the parent element 50px */
top: 50px;
/* From the left edge of the parent element 100px */
left: 100px;
background-color: purple;
}
<div class="parent">
<div class="box1"></div>
<div class="box2"></div>
</div>

 Insert picture description here

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