htmlquery
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How check an object exist or not
I have problem with this example code:
htmlquery.Find(doc, //tbody/tr//td/div[1]/@title
)
and get this error:
invalid memory address or nil pointer dereference....
which is true, but I want to manage it to not stop the process and just ignore and pass through it. or before check for find be sure that is exist.
any solution?
What is version of your htmlquery
and xpath
package? //tbody/tr//td/div[1]/@title
expression won't panic an error even not found any matching node by the expression. I guess your variable doc
is nil
. or list your example code to test.
I try to parse some pages.someone are completely ok but some of them haven't div tag in td and that's where I want to solve it. actually i remove [0] and check the length of result. but I interested to know if there is another way. thanks for your quick answer and this great package.
Try this method: QueryAll
, It will return error if they got an error. https://godoc.org/github.com/antchfx/htmlquery#QueryAll
But your example is strange, htmlquery
won't throw nil pointer dereference
error event no matching node, like you talked. //tbody/tr//td/div[1]/@title
was passed on my local test.