英文:
Extract meta description field with goquery
问题
我正在使用goquery包从网页中提取信息。请看下面的代码。运行函数后的结果是：
描述字段：text/html; charset=iso-8859-15
描述字段：width=device-width
描述字段：THIS IS THE TEXT I WANT TO EXTRACT
我已经接近成功了，但是我只想获取name为'description'的meta字段。不幸的是，我无法弄清楚如何将这个额外条件添加到我的代码中。
func ExampleScrapeDescription() {
htmlCode :=
`<!doctype html>
<html lang="NL">
<head>
<meta http-equiv="content-type" content="text/html; charset=iso-8859-15">
<meta name="viewport" content="width=device-width">
<meta name="description" content="THIS IS THE TEXT I WANT TO EXTRACT">
<title>page title</title>
</head>
<body class="fixedHeader">
page body
</body>
</html>`
doc, err := goquery.NewDocumentFromReader(strings.NewReader((htmlCode)))
if err != nil {
log.Fatal(err)
}
doc.Find("meta").Each(func(i int, s *goquery.Selection) {
name, _ := s.Attr("name")
if name == "description" {
description, _ := s.Attr("content")
fmt.Printf("Description field: %s\n", description)
}
})
}
英文:
I'm using the goquery package to extract pieces of information from a webpage. Please see my code below. The outcome when after running the function is:
Description field: text/html; charset=iso-8859-15
Description field: width=device-width
Description field: THIS IS THE TEXT I WANT TO EXTRACT
I'm almost there, however I only want to get the meta field where the name == 'description'. Unfortunately I can't figure out how to add this extra condition to my code.
func ExampleScrapeDescription() {
htmlCode :=
`<!doctype html>
<html lang="NL">
<head>
<meta http-equiv="content-type" content="text/html; charset=iso-8859-15">
<meta name="viewport" content="width=device-width">
<meta name="description" content="THIS IS THE TEXT I WANT TO EXTRACT">
<title>page title</title>
</head>
<body class="fixedHeader">
page body
</body>
</html>`
doc, err := goquery.NewDocumentFromReader(strings.NewReader((htmlCode)))
if err != nil {
log.Fatal(err)
}
doc.Find("meta").Each(func(i int, s *goquery.Selection) {
description, _ := s.Attr("content")
fmt.Printf("Description field: %s\n", description)
})
}
答案1
得分: 11
只需检查name属性的值是否与"description"匹配：
doc.Find("meta").Each(func(i int, s *goquery.Selection) {
if name, _ := s.Attr("name"); name == "description" {
description, _ := s.Attr("content")
fmt.Printf("Description field: %s\n", description)
}
})
如果你想以不区分大小写的方式比较name属性的值，可以使用strings.EqualFold()：
if name, _ := s.Attr("name"); strings.EqualFold(name, "description") {
// 继续提取和使用description的内容
}
英文:
Just examine the value of the name attribute whether it matches "description":
doc.Find("meta").Each(func(i int, s *goquery.Selection) {
if name, _ := s.Attr("name"); name == "description" {
description, _ := s.Attr("content")
fmt.Printf("Description field: %s\n", description)
}
})
You may want to compare the value of the name attribute in a case insensitive manner, for that you can use strings.EqualFold():
if name, _ := s.Attr("name"); strings.EqualFold(name, "description") {
// proceed to extract and use the content of description
}
答案2
得分: 3
attr, _ := doc.Find("meta[name='description']").Attr("content")
attr，_：= doc.Find（“meta[name ='description']”）。Attr（“content”）
英文:
attr, _ := doc.Find("meta[name='description']").Attr("content")
通过集体智慧和协作来改善编程学习和解决问题的方式。致力于成为全球开发者共同参与的知识库，让每个人都能够通过互相帮助和分享经验来进步。
评论