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# cascadia
[](https://travis-ci.org/andybalholm/cascadia)
The Cascadia package implements CSS selectors for use with the parse trees produced by the html package.
To test CSS selectors without writing Go code, check out [cascadia](https://github.com/suntong/cascadia) the command line tool, a thin wrapper around this package.
[Refer to godoc here](https://godoc.org/github.com/andybalholm/cascadia).
## Example
The following is an example of how you can use Cascadia.
```go
package main
import (
"fmt"
"log"
"strings"
"github.com/andybalholm/cascadia"
"golang.org/x/net/html"
)
var pricingHtml string = `
<div class="card mb-4 box-shadow">
<div class="card-header">
<h4 class="my-0 font-weight-normal">Free</h4>
</div>
<div class="card-body">
<h1 class="card-title pricing-card-title">$0/mo</h1>
<ul class="list-unstyled mt-3 mb-4">
<li>10 users included</li>
<li>2 GB of storage</li>
<li><a href="https://example.com">See more</a></li>
</ul>
</div>
</div>
<div class="card mb-4 box-shadow">
<div class="card-header">
<h4 class="my-0 font-weight-normal">Pro</h4>
</div>
<div class="card-body">
<h1 class="card-title pricing-card-title">$15/mo</h1>
<ul class="list-unstyled mt-3 mb-4">
<li>20 users included</li>
<li>10 GB of storage</li>
<li><a href="https://example.com">See more</a></li>
</ul>
</div>
</div>
<div class="card mb-4 box-shadow">
<div class="card-header">
<h4 class="my-0 font-weight-normal">Enterprise</h4>
</div>
<div class="card-body">
<h1 class="card-title pricing-card-title">$29/mo</h1>
<ul class="list-unstyled mt-3 mb-4">
<li>30 users included</li>
<li>15 GB of storage</li>
<li><a>See more</a></li>
</ul>
</div>
</div>
`
func Query(n *html.Node, query string) *html.Node {
sel, err := cascadia.Parse(query)
if err != nil {
return &html.Node{}
}
return cascadia.Query(n, sel)
}
func QueryAll(n *html.Node, query string) []*html.Node {
sel, err := cascadia.Parse(query)
if err != nil {
return []*html.Node{}
}
return cascadia.QueryAll(n, sel)
}
func AttrOr(n *html.Node, attrName, or string) string {
for _, a := range n.Attr {
if a.Key == attrName {
return a.Val
}
}
return or
}
func main() {
doc, err := html.Parse(strings.NewReader(pricingHtml))
if err != nil {
log.Fatal(err)
}
fmt.Printf("List of pricing plans:\n\n")
for i, p := range QueryAll(doc, "div.card.mb-4.box-shadow") {
planName := Query(p, "h4").FirstChild.Data
price := Query(p, ".pricing-card-title").FirstChild.Data
usersIncluded := Query(p, "li:first-child").FirstChild.Data
storage := Query(p, "li:nth-child(2)").FirstChild.Data
detailsUrl := AttrOr(Query(p, "li:last-child a"), "href", "(No link available)")
fmt.Printf(
"Plan #%d\nName: %s\nPrice: %s\nUsers: %s\nStorage: %s\nDetails: %s\n\n",
i+1,
planName,
price,
usersIncluded,
storage,
detailsUrl,
)
}
}
```
The output is:
```
List of pricing plans:
Plan #1
Name: Free
Price: $0/mo
Users: 10 users included
Storage: 2 GB of storage
Details: https://example.com
Plan #2
Name: Pro
Price: $15/mo
Users: 20 users included
Storage: 10 GB of storage
Details: https://example.com
Plan #3
Name: Enterprise
Price: $29/mo
Users: 30 users included
Storage: 15 GB of storage
Details: (No link available)
```