dojo.NodeList-traverse-- dojo遍历节点列表的操作方法

发布时间：2020-12-16 21:48:05 所属栏目：百科来源：网络整理

导读：dojo.NodeList-traverse Status: Draft Version: 1.0 Project owner: James Burke Available: since 1.4 Method extensions to dojo.NodeList / dojo.query for traversing the DOM. These methods are intended to match the API naming and behavior as th

dojo.NodeList-traverse

Status:	Draft
Version:	1.0
Project owner:	James Burke
Available:	since 1.4

Method extensions to dojo.NodeList /dojo.query for traversing the DOM. These methods are intended to match the API naming and behavior as the similarly named methods in jQuery.

Introduction

Doing a dojo.require(“dojo.NodeList-traverse”) will add some addition methods to dojo.NodeList (the return object from a dojo.query call) that allow easier traversal of the DOM as it relates to the nodes in the dojo.NodeList.

Usage

Here is a simple example showing how dojo.NodeList-traverse adds a “children” method to dojo.NodeList that can be called via the normal method chaining done with a dojo.query result:

 
       dojo
.
require
(
"dojo.NodeList-traverse"
);

//Grabs all child nodes of all divs

//and returns a dojo.NodeList object

//to allow further chaining operations

dojo
.
query
(
"div"
).
children
();

Methods added by dojo.NodeList-traverse

children

Returns all immediate child elements for nodes in this dojo.NodeList. Optionally takes a query to filter the child elements.

.end() can be used on the returned dojo.NodeList to get back to the original dojo.NodeList.

Example

Assume a DOM created by this markup:

 
    
     
       
       
        <div
 class=
"container"
>

  <div
 class=
"red"
>
Red One</div>

  Some Text
  <div
 class=
"blue"
>
Blue One</div>

  <div
 class=
"red"
>
Red Two</div>

  <div
 class=
"blue"
>
Blue Two</div>

</div>

 
       
 
     
 
    
  

 
    
     
       
        dojo
.
require
(
"dojo.NodeList-traverse"
);


//This code returns the four child divs in a dojo.NodeList:

dojo
.
query
(
".container"
).
children
();


//This code returns the two divs that have the class "red" in a dojo.NodeList:

dojo
.
query
(
".container"
).
children
(
".red"
);

 
       
 
     
 
    
  

closest

Returns closest parent that matches query, including current node in this dojo.NodeList if it matches the query. Optionally takes a query to filter the closest nodes.

.end() can be used on the returned dojo.NodeList to get back to the original dojo.NodeList.

Example

Assume a DOM created by this markup:

 
        dojo
.
require
(
"dojo.NodeList-traverse"
);

//This code returns the div with class "container" in a dojo.NodeList:

dojo
.
query
(
".red"
).
closest
(
".container"
);

parent

Returns immediate parent elements for nodes in this dojo.NodeList. Optionally takes a query to filter the parent elements.

.end() can be used on the returned dojo.NodeList to get back to the original dojo.NodeList.

Example

Assume a DOM created by this markup:

 
    
     
       
       
        <div
 class=
"container"
>

  <div
 class=
"red"
>
Red One</div>

  <div
 class=
"blue first"
><span
 class=
"text"
>
Blue One</span></div>

  <div
 class=
"red"
>
Red Two</div>

  <div
 class=
"blue"
><span
 class=
"text"
>
Blue Two</span></div>

</div>

 
       
 
     
 
    
  

 
    
     
       
        dojo
.
require
(
"dojo.NodeList-traverse"
);


//This code returns the two divs with class "blue" in a dojo.NodeList:

dojo
.
query
(
".text"
).
parent
();


//This code returns the one div with class "blue" and "first" in a dojo.NodeList:

dojo
.
query
(
".text"
).
parent
(
".first"
);

 
       
 
     
 
    
  

parents

Returns all parent elements for nodes in this dojo.NodeList. Optionally takes a query to filter the parent elements.

.end() can be used on the returned dojo.NodeList to get back to the original dojo.NodeList.

Example

Assume a DOM created by this markup:

 
    
     
       
        dojo
.
require
(
"dojo.NodeList-traverse"
);


//This code returns the two divs with class "blue" and the div with class "container" in a dojo.NodeList:

dojo
.
query
(
".text"
).
parents
();


//This code returns the one div with class "container" in a dojo.NodeList:

dojo
.
query
(
".text"
).
parents
(
".first"
);

 
       
 
     
 
    
  

siblings

Returns all sibling elements for nodes in this dojo.NodeList. Optionally takes a query to filter the sibling elements.

.end() can be used on the returned dojo.NodeList to get back to the original dojo.NodeList.

Example

Assume a DOM created by this markup:

 
    
     
       
        <div
 class=
"container"
>

  <div
 class=
"red"
>
Red One</div>

  Some Text
  <div
 class=
"blue first"
>
Blue One</div>

  <div
 class=
"red"
>
Red Two</div>

  <div
 class=
"blue"
>
Blue Two</div>

</div>

 
       
 
     
 
    
  

 
        dojo
.
require
(
"dojo.NodeList-traverse"
);

//This code returns the two div with class "red" and the other div

//with class "blue" that does not have "first". in a dojo.NodeList:

dojo
.
query
(
".first"
).
siblings
();

//This code returns the two div with class "red" in a dojo.NodeList:

dojo
.
query
(
".first"
).
siblings
(
".red"
);

Returns the next element for nodes in this dojo.NodeList. Optionally takes a query to filter the next elements.

.end() can be used on the returned dojo.NodeList to get back to the original dojo.NodeList.

Example

Assume a DOM created by this markup:

 
    
     
       
        <div
 class=
"container"
>

  <div
 class=
"red"
>
Red One</div>

  Some Text
  <div
 class=
"blue first"
>
Blue One</div>

  <div
 class=
"red"
>
Red Two</div>

  <div
 class=
"blue last"
>
Blue Two</div>

</div>

 
       
 
     
 
    
  

 
    
     
       
        dojo
.
require
(
"dojo.NodeList-traverse"
);


//This code returns the div with class "red" and has innerHTML of "Red Two" in a dojo.NodeList:

dojo
.
query
(
".first"
).
next
();


//This code does not match any nodes so it returns an empty dojo.NodeList:

dojo
.
query
(
".last"
).
next
(
".red"
);

 
       
 
     
 
    
  

nextAll

Returns all sibling elements that come after the nodes in this dojo.NodeList. Optionally takes a query to filter the sibling elements.

.end() can be used on the returned dojo.NodeList to get back to the original dojo.NodeList.

Example

Assume a DOM created by this markup:

 
    
     
       
        <div
 class=
"container"
>

  <div
 class=
"red"
>
Red One</div>

  Some Text
  <div
 class=
"blue first"
>
Blue One</div>

  <div
 class=
"red next"
>
Red Two</div>

  <div
 class=
"blue next"
>
Blue Two</div>

</div>

 
       
 
     
 
    
  

 
    
     
       
        dojo
.
require
(
"dojo.NodeList-traverse"
);


//This code returns the two divs with class of "next":

dojo
.
query
(
".first"
).
nextAll
();


//This code returns the one div with class "red" and innerHTML "Red Two".

dojo
.
query
(
".first"
).
nextAll
(
".red"
);

 
       
 
     
 
    
  

Returns the previous element for nodes in this dojo.NodeList. Optionally takes a query to filter the previous elements.

.end() can be used on the returned dojo.NodeList to get back to the original dojo.NodeList.

Example

Assume a DOM created by this markup:

 
    
     
       
        dojo
.
require
(
"dojo.NodeList-traverse"
);


//This code returns the div with class "red" and has innerHTML of "Red One" in a dojo.NodeList:

dojo
.
query
(
".first"
).
prev
();


//This code does not match any nodes so it returns an empty dojo.NodeList:

dojo
.
query
(
".first"
).
prev
(
".blue"
);

 
       
 
     
 
    
  

prevAll

Returns all sibling elements that come before the nodes in this dojo.NodeList. Optionally takes a query to filter the previous elements.

The returned nodes will be in reverse DOM order -- the first node in the list will be the node closest to the original node/NodeList.

.end() can be used on the returned dojo.NodeList to get back to the original dojo.NodeList.

Example

Assume a DOM created by this markup:

 
    
     
       
        <div
 class=
"container"
>

  <div
 class=
"red prev"
>
Red One</div>

  Some Text
  <div
 class=
"blue prev"
>
Blue One</div>

  <div
 class=
"red second"
>
Red Two</div>

  <div
 class=
"blue last"
>
Blue Two</div>

</div>

 
       
 
     
 
    
  

 
    
     
       
        dojo
.
require
(
"dojo.NodeList-traverse"
);


//This code returns the two divs with class of "prev":

dojo
.
query
(
".first"
).
prevAll
();


//This code returns the one div with class "red prev" and innerHTML "Red One":

dojo
.
query
(
".first"
).
prevAll
(
".red"
);

 
       
 
     
 
    
  

andSelf

Adds the nodes from the previous dojo.NodeList to the current dojo.NodeList.

.end() can be used on the returned dojo.NodeList to get back to the original dojo.NodeList.

Example

Assume a DOM created by this markup:

 
    
     
       
        <div
 class=
"container"
>

  <div
 class=
"red prev"
>
Red One</div>

  Some Text
  <div
 class=
"blue prev"
>
Blue One</div>

  <div
 class=
"red second"
>
Red Two</div>

  <div
 class=
"blue"
>
Blue Two</div>

</div>

 
       
 
     
 
    
  

 
        dojo
.
require
(
"dojo.NodeList-traverse"
);

//This code returns the two divs with class of "prev",as well as the div with class "second":

dojo
.
query
(
".second"
).
prevAll
().
andSelf
();

first

Returns the first node in this dojo.NodeList as a dojo.NodeList.

This method is provided due to a difference in the Acme query engine used by default in Dojo. The Acme engine does not support ":first" queries,since it is not part of the CSS3 spec. This method can be used to give the same effect. For instance,instead of doing dojo.query("div:first"),you can do dojo.query("div").first().

Example

Assume a DOM created by this markup:

 
        dojo
.
require
(
"dojo.NodeList-traverse"
);

//This code returns the div with class "blue" and "first" in a dojo.NodeList:

dojo
.
query
(
".blue"
).
first
();

last

Returns the last node in this dojo.NodeList as a dojo.NodeList.

This method is provided due to a difference in the Acme query engine used by default in Dojo. The Acme engine does not support ":last" queries,instead of doing dojo.query("div:last"),you can do dojo.query("div").last().

Example

Assume a DOM created by this markup:

 
        dojo
.
require
(
"dojo.NodeList-traverse"
);

//This code returns the last div with class "blue" in a dojo.NodeList:

dojo
.
query
(
".blue"
).
last
();

even

Returns the even nodes in this dojo.NodeList as a dojo.NodeList.

This method is provided due to a difference in the Acme query engine used by default in Dojo. The Acme engine does not support ":even" queries,instead of doing dojo.query("div:even"),you can do dojo.query("div").even().

Example

Assume a DOM created by this markup:

 
    
     
       
        <div
 class=
"container"
>

  <div
 class=
"interior red"
>
Red One</div>

  <div
 class=
"interior blue"
>
Blue One</div>

  <div
 class=
"interior red"
>
Red Two</div>

  <div
 class=
"interior blue"
>
Blue Two</div>

</div>

 
       
 
     
 
    
  

 
        dojo
.
require
(
"dojo.NodeList-traverse"
);

//This code returns the two divs with class "blue" in a dojo.NodeList:

dojo
.
query
(
".interior"
).
even
();

odd

Returns the odd nodes in this dojo.NodeList as a dojo.NodeList.

This method is provided due to a difference in the Acme query engine used by default in Dojo. The Acme engine does not support ":odd" queries,instead of doing dojo.query("div:odd"),you can do dojo.query("div").odd().

Example

Assume a DOM created by this markup:

 
        dojo
.
require
(
"dojo.NodeList-traverse"
);

//This code returns the two divs with class "red" in a dojo.NodeList:

dojo
.
query
(
".interior"
).
odd
();

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