Rss Node.js Reference Documentation

Rss

Current Version: 10.0.0

Represents an RSS document or sub-part of a document such as a channel, image, or item. The RSS API allows one to download, create and modify RSS documents.

Object Creation

var obj = new chilkat.Rss();

Properties

DebugLogFilePath

DebugLogFilePath

· string

If set to a file path, causes each Chilkat method or property call to automatically append it's LastErrorText to the specified log file. The information is appended such that if a hang or crash occurs, it is possible to see the context in which the problem occurred, as well as a history of all Chilkat calls up to the point of the problem. The VerboseLogging property can be set to provide more detailed information.

This property is typically used for debugging the rare cases where a Chilkat method call hangs or generates an exception that halts program execution (i.e. crashes). A hang or crash should generally never happen. The typical causes of a hang are:

a timeout related property was set to 0 to explicitly indicate that an infinite timeout is desired,
the hang is actually a hang within an event callback (i.e. it is a hang within the application code), or
there is an internal problem (bug) in the Chilkat code that causes the hang.

More Information and Examples

Example showing how to use DebugLogFilePath.

LastErrorHtml

LastErrorHtml

· string, read-only

Provides information in HTML format about the last method/property called. If a method call returns a value indicating failure, or behaves unexpectedly, examine this property to get more information.

LastErrorText

LastErrorText

· string, read-only

Provides information in plain-text format about the last method/property called. If a method call returns a value indicating failure, or behaves unexpectedly, examine this property to get more information.

More Information and Examples

Concept of LastErrorText LastErrorText Standard Information

LastErrorXml

LastErrorXml

· string, read-only

Provides information in XML format about the last method/property called. If a method call returns a value indicating failure, or behaves unexpectedly, examine this property to get more information.

LastMethodSuccess

LastMethodSuccess

· boolean

Indicate whether the last method call succeeded or failed. A value of true indicates success, a value of false indicates failure. This property is automatically set for method calls. It is not modified by property accesses. The property is automatically set to indicate success for the following types of method calls:

Any method that returns a string.
Any method returning a Chilkat object, binary bytes, or a date/time.
Any method returning a standard boolean status value where success = true and failure = false.
Any method returning an integer where failure is defined by a return value less than zero.

Note: Methods that do not fit the above requirements will always set this property equal to true. For example, a method that returns no value (such as a "void" in C++) will technically always succeed.

NumChannels

NumChannels

· integer, read-only

The number of channels in the RSS document.

NumItems

NumItems

· integer, read-only

The number of items in the channel.

VerboseLogging

VerboseLogging

· boolean

If set to true, then the contents of LastErrorText (or LastErrorXml, or LastErrorHtml) may contain more verbose information. The default value is false. Verbose logging should only be used for debugging. The potentially large quantity of logged information may adversely affect peformance.

Version

Version

· string, read-only

Version of the component/library, such as "9.5.0.94"

More Information and Examples

How to get the Chilkat version at runtime.

Methods

AddNewChannel

var ret_rss = AddNewChannel();

· Returns a Rss

Adds a new channel to the RSS document. Returns the Rss object representing the Channel which can then be edited.

Returns null on failure

AddNewImage

var ret_rss = AddNewImage();

· Returns a Rss

Adds a new image to the RSS document. Returns the Rss object representing the image, which can then be edited.

Returns null on failure

AddNewItem

var ret_rss = AddNewItem();

· Returns a Rss

Adds a new Item to an Rss channel. Returns the Rss object representing the item which can then be edited.

Returns null on failure

DownloadRss

var status = DownloadRss(url);

· Returns Boolean (true for success, false for failure).
· url String

Downloads an RSS document from the Internet and populates the Rss object with the contents.

Returns true for success, false for failure.

More Information and Examples

Example: Read RSS Feed

DownloadRssAsync ⁽¹⁾

var ret_task = DownloadRssAsync(url);

· Returns a Task
· url String

Creates an asynchronous task to call the DownloadRss method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Returns null on failure

GetAttr

var retStr = GetAttr(tag, attrName);

· Returns a String.
· tag String
· attrName String

Returns the value of a sub-element attribute. For example, to get the value of the "isPermaLink" attribute of the "guid" sub-element, call item.GetAttr("guid","isPermaLink").

Returns null on failure

GetChannel

var ret_rss = GetChannel(index);

· Returns a Rss
· index Number

Returns the Nth channel of an RSS document. Usually there is only 1 channel per document, so the index argument should be set to 0.

Returns null on failure

GetCount

var retInt = GetCount(tag);

· Returns a Number.
· tag String

Return the number of sub-elements with a specific tag.

GetDateStr

var retStr = GetDateStr(tag);

· Returns a String.
· tag String

The same as GetDate, except the date/time is returned in RFC822 string format.

Returns null on failure

GetImage

var ret_rss = GetImage();

· Returns a Rss

Return the image associated with the channel.

Returns null on failure

GetInt

var retInt = GetInt(tag);

· Returns a Number.
· tag String

Return the value of a numeric sub-element as an integer.

GetItem

var ret_rss = GetItem(index);

· Returns a Rss
· index Number

Return the Nth item of a channel as an RSS object.

Returns null on failure

GetString

var retStr = GetString(tag);

· Returns a String.
· tag String

Return the value of an sub-element as a string.

Returns null on failure

LoadRssFile

var status = LoadRssFile(filePath);

· Returns Boolean (true for success, false for failure).
· filePath String

Load an RSS document from a file.

Returns true for success, false for failure.

LoadRssString

var status = LoadRssString(rssString);

· Returns Boolean (true for success, false for failure).
· rssString String

Loads an RSS feed document from an in-memory string.

Returns true for success, false for failure.

LoadTaskCaller

var status = LoadTaskCaller(task);

· Returns Boolean (true for success, false for failure).
· task Task

Introduced in version 9.5.0.80

Loads the caller of the task's async method.

Returns true for success, false for failure.

MGetAttr

var retStr = MGetAttr(tag, index, attrName);

· Returns a String.
· tag String
· index Number
· attrName String

Get an attribute value for the Nth sub-element having a specific tag. As an example, an RSS item may have several "category" sub-elements. To get the value of the "domain" attribute for the 3rd category, call MGetAttr("category",2,"domain").

Returns null on failure

MGetString

var retStr = MGetString(tag, index);

· Returns a String.
· tag String
· index Number

Get the value of the Nth occurrence of a sub-element. Indexing begins at 0.

Returns null on failure

MSetAttr

var status = MSetAttr(tag, idx, attrName, value);

· Returns Boolean (true for success, false for failure).
· tag String
· idx Number
· attrName String
· value String

Set an attribute on the Nth occurrence of a sub-element.

Returns true for success, false for failure.

MSetString

var status = MSetString(tag, idx, value);

· Returns Boolean (true for success, false for failure).
· tag String
· idx Number
· value String

Set the value of the Nth occurrence of a sub-element. Indexing begins at 0.

Returns true for success, false for failure.

NewRss

NewRss();

· Does not return anything (returns Undefined).

Clears the RSS document.

Remove

Remove(tag);

· Does not return anything (returns Undefined).
· tag String

Removes a sub-element from the RSS document.

SetAttr

SetAttr(tag, attrName, value);

· Does not return anything (returns Undefined).
· tag String
· attrName String
· value String

Sets the value of a sub-element attribute.

SetDateNow

SetDateNow(tag);

· Does not return anything (returns Undefined).
· tag String

Sets the value of a date/time sub-element to the current system date/time.

SetDateStr

SetDateStr(tag, dateTimeStr);

· Does not return anything (returns Undefined).
· tag String
· dateTimeStr String

The same as SetDate, except the date/time is passed as an RFC822 string.

SetInt

SetInt(tag, value);

· Does not return anything (returns Undefined).
· tag String
· value Number

Sets the value of an integer sub-element.

SetString

SetString(tag, value);

· Does not return anything (returns Undefined).
· tag String
· value String

Sets the value of a sub-element.

ToXmlString

var retStr = ToXmlString();

· Returns a String.

Returns the RSS document as an XML string.

Returns null on failure