How to print text between css selectors in golang using html package?

Question

I have html document

<value>1,2,3</value>
 <value>,1,3,5</value>

and what to extract text with code below but it only prints 'value' tags (css selectors). How to print the text from between tags instead using golang html package ?

z := html.NewTokenizer(b)
    for {
        tt := z.Next()
        switch {
        case tt == html.ErrorToken:
            return
        case tt == html.StartTagToken:
            t := z.Token()
            isAnchor := t.Data == "value"
            if isAnchor {
                fmt.Println(t.Data)
            }
        }
    }

Is the Text() method that you're looking for ? godoc.org/golang.org/x/net/html#Tokenizer.Text — Boris Le Méec
– Boris Le Méec, Commented Nov 22, 2016 at 13:31
I think StartTagToken's Data will always contain the tag's name (in this case "value"). You should advance the tokenizer once more to get the TextToken. It's Data should be the text itself (i.e "1,2,3"). — jussius
– jussius, Commented Nov 22, 2016 at 13:42

whytheplatypus · Accepted Answer · 2016-11-22 16:17:29Z

4

This seems to work for me:

r := strings.NewReader("<value>1,2,3</value><value>,1,3,5</value>")
doc, err := html.Parse(r)
if err != nil {
    log.Fatal(err)
}
var f func(*html.Node)
f = func(n *html.Node) {
    if n.Type == html.ElementNode && n.Data == "value" {
        fmt.Println(n.FirstChild.Data)
    }
    for c := n.FirstChild; c != nil; c = c.NextSibling {
        f(c)
    }
}
f(doc)

I think the key is grabbing the FirstChild after finding the "value" node.

answered Nov 22, 2016 at 16:17

whytheplatypus

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Comments

Boris Le Méec · Accepted Answer · 2016-11-22 15:06:51Z

1

You have to use Text() method on the next Token.

if isAnchor := t.Data == "value"; isAnchor {
    z.Next()
    fmt.Println(z.Text())
}

edited Nov 22, 2016 at 15:06

answered Nov 22, 2016 at 14:14

Boris Le Méec

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6 Comments

irom Over a year ago

z.Next().Text undefined (type html.TokenType has no field or method Text)

Boris Le Méec Over a year ago

Edited. Sorry for the mistake.

irom Over a year ago

now: z.Next().Token undefined (type html.TokenType has no field or method Token)

Boris Le Méec Over a year ago

Edited again. Hope I don't have to do it again ;)

irom Over a year ago

for some reason it prints me empty brackets [] as Text. I think I had it before. I tried to change to <value>1</value> with single character but makes no difference

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