ajax--receiving server-side response data

* Receive server-side response data

* Use the ResponseText property of the XMLHttpRequest core object

* This property can only receive text (HTML) formatting

* Questions

* Parsing process is more complex (split)

* Easy to make mistakes when splitting or stringing

* XML format

* Basic Content

* Differences between HTML, XHTML, DHTML, and XML

* HTML is the page-element defines the case

* XHTML is strictly HTML-the element defines lowercase

* dhtml-bom| Dom

* XML-configuration file | data format

* XML file with the extension ". xml"

* XML is defined in much the same way as HTML

* Elements of HTML are predefined

* XML allows for custom elements

* Version of XML

* Version 1.0-Current unique version

* Version 1.1-almost no one uses

* Note

* version will not be updated again

* The role of XML

* As data format-store data

* XML syntax

* Disclaimer

<?xml version= "1.0" encoding= "UTF-8"?>

* Version-sets the current edition of the XML file

* Encoding-sets the encoding of the current XML file

* Note-appears on 0 rows and 0 columns

* Define Elements

* Root element

* Must be the start tag

* You can define only one

* Define Elements

* Element names can be customized

* Classification

* Start tag or single label

* Define Attributes

* Define Annotations

* Practice-Define province and city information using XML files

* How to define all can, conform to XML syntax can

* Determines how easy it is to use JavaScript parsing later

* DOM parsing xml

* Parser to create XML

function Parsexml (XML) {

Declares the DOM object after parsing the XML

var xmldoc = null;

According to the different browser

if (window. Domparser) {

Other browsers

var parser = new Domparser ();

xmldoc = parser.parsefromstring (XML, "Application/xml");

}else{

IE browser

xmldoc = new ActiveXObject ("Microsoft.XMLDOM");

Xmldoc.async = false;

Xmldoc.loadxml (XML);

}

return xmldoc;

}

* Parsing XML is consistent with parsing HTML

* Rarely use Byid and byname two methods

* Note

* Browser does not allow external XML files to be read

* Browser parsing strings that conform to XML format

* XML format in AJAX

* Requested data format-XML

* How the client constructs data in a format that conforms to XML

* Built data type-string type

* The contents of the string conform to the syntax requirements of XML format

* How the server receives data in an XML-compliant format

* Receive client request data-string type

* PHP integrates DOM-related content

* DOMDocument class

* DomElement Class

* Domnode Class

* Response Data Format-XML

* Server-side how to build data in XML-compliant format

* Set the server-side response header "Content-type" value to "Text/xml"

* Build data content that conforms to XML format

* Build String content manually

* Methods for DOMDocument objects

* LoadXML (String that conforms to XML format);

* SaveXML () method to respond

* How the client receives data in a format that conforms to XML

* Receive using the Responsexml property of the XMLHttpRequest object

* The XML DOM object is received (no parsing is required using an XML parser)

* Parsing an XML DOM object directly using the DOM

* Exercise-two-level linkage (server-side response data format is in XML format)

* JSON format

* Basic Content

* Json-javascript Object Notation (JS native support)

* JSON data format originated from JavaScript

* Features

* Easy for programmers to read and write

* Easy computer parsing and generation

* JSON is currently one of the most widely used data formats on the Web

* Structure of JSON

* Array-arrays

* Object-Objects

* Supported data types

* String Strings

* Number Value

* Boolean-true|false

* Object

* Array

* NULL

* JSON format in Ajax

* Request format is JSON

* Client sends data requested in JSON format to server side

* Build a string that conforms to the JSON format

* Ensure that the string is defined using single quotation marks (double quotes inside)

* Server-side receive JSON-formatted data

* Receive client-side data

* Parsing using the Json_decode () function

Json_decode ($json, True)

* Response format is JSON

* Server-side sends the response to the client in JSON-formatted data

* Use the Json_encode () function to convert a PHP variable (array) into a JSON-formatted string

* Client receives JSON-formatted data

* Receive using the ResponseText property of the XMLHttpRequest object

* No Responsejson attribute

* Use the Eval () function to convert

* Job-complete two-level linkage using JSON format

* Advantages and disadvantages of HTML (text format), XML format, and JSON format

* HTML format

* Advantages-Simple

* Disadvantages-Complex analysis

* XML format

* Advantages-Easy to build complex data

* Disadvantages-build, parse complex

* JSON format

* Advantages-Lightweight

* Disadvantages-Possible conversion failure

* Review Content

* DOM-independent of any development language

* Classification of DOM

* DOM CORE

* DOM HTML

* DOM XML

* DOM CSS

* DOM API

* Get elements

* Create elements

* Replace Element

* Delete Element

* Insert Element

* ...

*

ajax--receiving server-side response data