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antchfx
substring-after() is not being executed
I tried a few expressions with substring-after() and it seems the functions is not being executed at all. Tried to debug func.go and substringIndFunc is being called, returns a callable which is never called though.
Example expression: substring-after(//span[@class="pageNumbersInfo"]//text(), "of ") Node: Pages 1 of 25
Hi, I just came across this problem, too.
Here is a minimal (not) working example:
package main
import (
"log"
"strings"
"github.com/antchfx/htmlquery"
)
func main() {
s := `<html>
<head></head>
<body>
<div id="foo-12345"></div>
</body>
</html>`
xpath := "substring-after(//div/@id, 'foo-')"
doc, err := htmlquery.Parse(strings.NewReader(s))
if err != nil {
log.Fatal(err)
}
results, err := htmlquery.QueryAll(doc, xpath)
if err != nil {
log.Fatal(err)
}
for _, r := range results {
log.Print(r)
}
}
When using the exact same XPath expression (and HTML) in the chromium dev tools, I get 12345 back as a result, but htmlquery does not seem to find anything.
@c4tz , substring-after() is a function, and return a string value not NODE type. your substring-after(//div/@id, 'foo-') is telling package to execute this function and returning a string value.
Compare the following two examples:
v := xpath.MustCompile("substring-after(//div/@id, 'foo-')").Evaluate(htmlquery.CreateXPathNavigator(doc))
if v != nil {
fmt.Println(v.(string)) // output: 12345
}
The below code is return Node values.
results, err := htmlquery.QueryAll(doc, "//div[substring-after(@id, 'foo-')]")
if err != nil {
log.Fatal(err)
}
for _, r := range results {
log.Print(r)
}
Ahh :bulb: Thank you for the clarification! Then it just was a misunderstanding on my side, sorry.