CODEWITHSUNDEEP
gogorillamux
Alan Flores
Alan Flores

Reputation: 35

How to check if URL param exists

I have to check if URL param exists before to do some type of validation. How can i do this?

if param come empty like this: http://myurl.com?myparam= then myParam == "" is true, but if the url come this way http://myurl.com (with out params) then myParam == "" also is true... so i need some way to validate if param come in the url

# example
# http://myurl.com?myparam=johndoe

// validate if param exists, here i dont know how to do
#
#


// then do some validation
func validateMyParamIsNotNumber(r *http.Request, resultMessage *string) {
    myParam := r.FormValue("myparam")

    if myParam != ""  && isNotNumber(product) {
        *resultMessage = "The myparam filter must be a number"
        return
    }
}

Upvotes: 1

Views: 5438

Answers (1)

Thundercat
Thundercat

Reputation: 121139

Check for presence of the key in Request.Form using map index with multiple assignment. Parse the form before checking the map.

func validateMyParamIsNotNumber(r *http.Request, resultMessage *string) {
    r.ParseForm()
    _, hasMyParam := r.Form["myparam"]
    ...

Upvotes: 5

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