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I would like to show client another page after data has been collected from previous page. But I have trouble redirect the new URL on the server side. Here is my logic:
And I am stuck on step 3 (here is an example of the flow):
type Stuff struct{ List []string } func checkcheck(w http.ResponseWriter, r *http.Request) { sinfo := Stuff{ List: some_slice } t, err := template.New("").Parse(tpl_ds) checkErr(err) err = r.ParseForm() checkErr(err) err = t.Execute(w, sinfo) checkErr(err) if r.Method == "POST" { saveChoice(r.Form["choices"]) /* step 3: make user open another URL */ } } And here is the template:
<html> <script> $(function () { $('form').on('submit', function (e) { e.preventDefault(); $.ajax({ type: 'post', data: $('form').serialize(), }); }); }); </script> <body> <form method="POST"> {{range .List}} <input type="checkbox" name="choices" value="{{.}}"> <span>{{.}}</span><br> {{end}} <input type="submit" value="Submit"> </form> </body> </html> May I know how I can redirect to a new page?
p.s. If I put URL on button, then server is not going to run saveChoice()
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What is URL redirect? URL redirect (URL forwarding) allows you to forward your domain visitors to any URL of your choice (to a new domain or a different website). You can set 301 (Permanent), 302 (Unmasked), and Masked (URL Frame) redirects for the domain names pointed to BasicDNS, PremiumDNS or FreeDNS.
Type "cache:sitename.com" in the address bar of Chrome and press "Enter" where "sitename" is the URL that is generating the redirect. This will show you a cached version of the site on which you can use the Inspect Element pane to find and capture the redirect URL.
When you redirect a URL, you're simply forwarding it to another address on the same, or different domain. You can set up a redirect that sends visitors to your new domain name when they'll try to access a URL that belonged to your old domain.
The http status 303 is the appropriate response here. So redirect the request with it.
if r.Method == "POST" { saveChoice(r.Form["choices"]) http.Redirect(w, r, newUrl, http.StatusSeeOther) } And if your newUrl is supposed to return a proper html page to the browser, you don't need to use ajax. Use an html form.
<form action="/postHandler" method="post"> {{range .List}} <input type="checkbox" name="choices" value="{{.}}"> <span>{{.}}</span><br> {{end}} <input type="submit" value="Submit"> </form> Notice action of the form is defined as /postHandler. Put the name of the endpoint that runs your saveChoice function there.
So to avoid http: multiple response.WriteHeader calls error you get use this code.
func checkcheck(w http.ResponseWriter, r *http.Request) { if r.Method == "GET" { sinfo := Stuff{ List: some_slice } t, err := template.New("").Parse(tpl_ds) checkErr(err) err = r.ParseForm() checkErr(err) err = t.Execute(w, sinfo) checkErr(err) } if r.Method == "POST" { saveChoice(r.Form["choices"]) http.Redirect(w, r, newUrl, http.StatusSeeOther) } } Otherwise, the server attempts to render both the form and the redirected url which will result in mutiple calls to the response writer.
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package main import ( "net/http" "html/template" ) type data struct { List string } func main() { http.HandleFunc("/", check) } func check(w http.ResponseWriter, r * http.Request) { if r.Method == "GET" { sinfo: = data { List: "Here is a list of the files Located with in", } var tpl_ds = "index.html" //t, err := template.New("").Parse(tpl_ds) t: = template.Must(template.ParseFiles(tpl_ds)) r.ParseForm() t.Execute(w, sinfo) } if r.Method == "POST" { saveChoice(r.Form["choices"]) http.Redirect(w, r, newUrl, http.StatusSeeOther) } } If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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