getAttribute
Read HTML attribute of root node of HTML tree
Description
Examples
Read HTML code from the URL https://www.mathworks.com/help/textanalytics
using webread
.
url = "https://www.mathworks.com/help/textanalytics";
code = webread(url);
Parse the HTML code using htmlTree
.
tree = htmlTree(code);
Find all the hyperlinks in the HTML tree using findElement
. The hyperlinks are the nodes with element name "A"
.
selector = "A";
subtrees = findElement(tree,selector);
subtrees(1:10)
ans = 10×1 htmlTree: <A class="svg_link navbar-brand" href="https://www.mathworks.com?s_tid=gn_logo"><IMG alt="MathWorks" class="mw_logo" src="/images/responsive/global/pic-header-mathworks-logo.svg"/></A> <A class="mwa-nav_login" href="https://www.mathworks.com/login?uri=http://www.mathworks.com/help/textanalytics/index.html">Sign In</A> <A href="https://www.mathworks.com/products.html?s_tid=gn_ps">Products</A> <A href="https://www.mathworks.com/solutions.html?s_tid=gn_sol">Solutions</A> <A href="https://www.mathworks.com/academia.html?s_tid=gn_acad">Academia</A> <A href="https://www.mathworks.com/support.html?s_tid=gn_supp">Support</A> <A href="https://www.mathworks.com/matlabcentral/?s_tid=gn_mlc">Community</A> <A href="https://www.mathworks.com/company/events.html?s_tid=gn_ev">Events</A> <A href="https://www.mathworks.com/company/aboutus/contact_us.html?s_tid=gn_cntus">Contact Us</A> <A href="https://www.mathworks.com/store?s_cid=store_top_nav&s_tid=gn_store">How to Buy</A>
Get the hyperlink references using getAttribute
. Specify the attribute name "href"
.
attr = "href";
str = getAttribute(subtrees,attr);
str(1:10)
ans = 10×1 string array
"https://www.mathworks.com?s_tid=gn_logo"
"https://www.mathworks.com/login?uri=http://www.mathworks.com/help/textanalytics/index.html"
"https://www.mathworks.com/products.html?s_tid=gn_ps"
"https://www.mathworks.com/solutions.html?s_tid=gn_sol"
"https://www.mathworks.com/academia.html?s_tid=gn_acad"
"https://www.mathworks.com/support.html?s_tid=gn_supp"
"https://www.mathworks.com/matlabcentral/?s_tid=gn_mlc"
"https://www.mathworks.com/company/events.html?s_tid=gn_ev"
"https://www.mathworks.com/company/aboutus/contact_us.html?s_tid=gn_cntus"
"https://www.mathworks.com/store?s_cid=store_top_nav&s_tid=gn_store"
Input Arguments
HTML tree, specified as an htmlTree
array.
Attribute name, specified as a string scalar, character vector, or a scalar cell array containing a character vector.
Output Arguments
HTML attribute, returned as a string array
More About
A typical HTML element contains the following components:
Element name – Name of the HTML tag. The element name corresponds to the
Name
property of the HTML tree.Attributes – Additional information about the tag. HTML attributes have the form
, wherename
="value
"
andname
denote the attribute name and value respectively. The attributes appear inside the opening HTML tag. To get the attribute values from an HTML tree, usevalue
getAttribute
.Content – Element content. The content appears between opening and closing HTML tags. The content can be text data or nested HTML elements. To extract the text from an
htmlTree
object, useextractHTMLText
. To get the nested HTML elements of anhtmlTree
object, use theChildren
property.
For example, the HTML element <a
href="https://www.mathworks.com">Home</a>
comprises the following
components:
Component | Value | Description | |
---|---|---|---|
Element name | a | Element is a hyperlink | |
Attribute | Attribute name | href | Hyperlink reference |
Attribute value | "https://www.mathworks.com" | Hyperlink reference value | |
Content | Home | Text to display |
Version History
Introduced in R2018b
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