How to POST a FORM from HTML to ASPX page

Question

How do I post a form from an HTML page to and ASPX page  2 0  and be able to read the values   I currently have an ASP NET site using the Membership provider and everything is working fine   Users can log in from the Login aspx page   We now want to be able to have users log in directly from another web site--which is basically a static HTML page   The users need to be able to enter their name and password on this HTML page and have it POST to my Login aspx page  where I can then log them in manually    Is it possible to pass form values from HTML to ASPX   I have tried everything and the Request Form Keys collection is always empty   I can t use a HTTP GET as these are credentials and can t be passed on a query string   The only way I know of is an iframe

User · Answer

The Request Form Keys collection will be empty if none of your html inputs have NAMEs  It s easy to forget to put them there after you ve been doing  NET for a while  Just name them and you ll be good to go

User · Answer

This is very possible   I mocked up 3 pages which should give you a proof of concept    aspx page    lt form id  form1  runat  server  gt       lt div gt           lt asp TextBox ID  TextBox1  runat  server  gt  lt  asp TextBox gt           lt asp TextBox TextMode  password  ID  TextBox2  runat  server  gt  lt  asp TextBox gt           lt asp Button ID  Button1  runat  server  Text  Button    gt       lt  div gt   lt  form gt    code behind   Protected Sub Page Load ByVal sender As Object  ByVal e As System EventArgs  Handles Me Load     For Each s As String In Request Form AllKeys         Response Write s  amp        amp  Request Form s   amp    lt br   gt        Next End Sub   Separate HTML page    lt form action  http   localhost MyTestApp Default aspx  method  post  gt       lt input name  TextBox1  type  text  value    id  TextBox1    gt       lt input name  TextBox2  type  password  id  TextBox2    gt       lt input type  submit  name  Button1  value  Button  id  Button1    gt   lt  form gt       and it regurgitates the form values as expected   If this isn t working  as others suggested  use a traffic analysis tool  fiddler  ethereal   because something probably isn t going where you re expecting

User · Answer

Are you sure your HTML form is correct  and does  in fact  do an HTTP POST  I would suggest running Fiddler2  and then trying to log in via your Login aspx  then the remote HTML site  and then comparing the requests that are sent to the server  For me  ASP Net always worked fine -- if HTTP request contains a valid POST  I can get to values using Request Form

User · Answer

In the html form  you need to supply additional viewstate variable and disable ViewState in a server page  This requires some control on both sides   though   Form HTML    lt html gt  lt body gt   lt form id  postForm  action  WebForm aspx  method  POST  gt           lt input type  text  name  postData  value  base-64-encoded-value    gt           lt input type  hidden  name    VIEWSTATE  value      gt    lt  -- still need   VIEWSTATE  even empty one -- gt       lt  form gt    lt  body gt  lt  html gt    Note empty   VIEWSTATE   WebForm aspx    lt    Page Language  C   AutoEventWireup  true   CodeBehind  WebForm aspx cs  Inherits  WebForm   EnableEventValidation  False  EnableViewState  false    gt    lt  DOCTYPE html gt    lt html xmlns  http   www w3 org 1999 xhtml  gt   lt head runat  server  gt       lt title gt  lt  title gt   lt  head gt   lt body gt       lt form id  postForm  runat  server  gt           lt asp TextBox ID  postData  runat  server  gt  lt  asp TextBox gt       lt div gt        lt  div gt       lt  form gt   lt  body gt   lt  html gt    Note EnableEventValidation  False   EnableViewState  false  to prevent validation error for empty view state  Code Behind Inherits values are not precise   WebForm cs   public partial class WebForm   System Web UI Page       protected void Page Load object sender  EventArgs e                string value   Encoding Unicode GetString Convert FromBase64String this postData Text

User · Answer

Hope this will help - Put this tag in html and   remove your login aspx design content  just write only page directive    and you will get the values in aspx page after submit button click  like this- protected void Page Load object sender  EventArgs e                     if   IsPostBack                        CompleteRegistration                      public void CompleteRegistration                      NameValueCollection nv   Request Form          if  nv Count    0                        string strname   nv  txtbox1                string strPwd   nv  txtbox2

User · Answer

You sure can   Create an HTML page with the form in it that will contain the necessary components from the login aspx page  i e  username  etc   and make sure they have the same IDs   For you action  make sure it s a post     You might have to do some code on the login aspx page in the Page Load function to read the form  in the Request Form object  and call the appropriate functions to log the user in  but other than that  you should have access to the form  and can do what you want with it

User · Answer

Remove runat  server  parts of data posting posted  aspx page

User · Answer

You sure can   The easiest way to see how you might do this is to browse to the aspx page you want to post to   Then save the source of that page as HTML   Change the action of the form on your new html page to point back to the aspx page you originally copied it from   Add value tags to your form fields and put the data you want in there  then open the page and hit the submit button

User · Answer

Are you sure your HTML form is correct  and does  in fact  do an HTTP POST  I would suggest running Fiddler2  and then trying to log in via your Login aspx  then the remote HTML site  and then comparing the requests that are sent to the server  For me  ASP Net always worked fine -- if HTTP request contains a valid POST  I can get to values using Request Form

User · Answer

You sure can   Create an HTML page with the form in it that will contain the necessary components from the login aspx page  i e  username  etc   and make sure they have the same IDs   For you action  make sure it s a post     You might have to do some code on the login aspx page in the Page Load function to read the form  in the Request Form object  and call the appropriate functions to log the user in  but other than that  you should have access to the form  and can do what you want with it

User · Answer

You sure can   The easiest way to see how you might do this is to browse to the aspx page you want to post to   Then save the source of that page as HTML   Change the action of the form on your new html page to point back to the aspx page you originally copied it from   Add value tags to your form fields and put the data you want in there  then open the page and hit the submit button

User · Answer

Are you sure your HTML form is correct  and does  in fact  do an HTTP POST  I would suggest running Fiddler2  and then trying to log in via your Login aspx  then the remote HTML site  and then comparing the requests that are sent to the server  For me  ASP Net always worked fine -- if HTTP request contains a valid POST  I can get to values using Request Form

User · Answer

You sure can   The easiest way to see how you might do this is to browse to the aspx page you want to post to   Then save the source of that page as HTML   Change the action of the form on your new html page to point back to the aspx page you originally copied it from   Add value tags to your form fields and put the data you want in there  then open the page and hit the submit button

User · Answer

In the html form  you need to supply additional viewstate variable and disable ViewState in a server page  This requires some control on both sides   though   Form HTML    lt html gt  lt body gt   lt form id  postForm  action  WebForm aspx  method  POST  gt           lt input type  text  name  postData  value  base-64-encoded-value    gt           lt input type  hidden  name    VIEWSTATE  value      gt    lt  -- still need   VIEWSTATE  even empty one -- gt       lt  form gt    lt  body gt  lt  html gt    Note empty   VIEWSTATE   WebForm aspx    lt    Page Language  C   AutoEventWireup  true   CodeBehind  WebForm aspx cs  Inherits  WebForm   EnableEventValidation  False  EnableViewState  false    gt    lt  DOCTYPE html gt    lt html xmlns  http   www w3 org 1999 xhtml  gt   lt head runat  server  gt       lt title gt  lt  title gt   lt  head gt   lt body gt       lt form id  postForm  runat  server  gt           lt asp TextBox ID  postData  runat  server  gt  lt  asp TextBox gt       lt div gt        lt  div gt       lt  form gt   lt  body gt   lt  html gt    Note EnableEventValidation  False   EnableViewState  false  to prevent validation error for empty view state  Code Behind Inherits values are not precise   WebForm cs   public partial class WebForm   System Web UI Page       protected void Page Load object sender  EventArgs e                string value   Encoding Unicode GetString Convert FromBase64String this postData Text

User · Answer

This is very possible   I mocked up 3 pages which should give you a proof of concept    aspx page    lt form id  form1  runat  server  gt       lt div gt           lt asp TextBox ID  TextBox1  runat  server  gt  lt  asp TextBox gt           lt asp TextBox TextMode  password  ID  TextBox2  runat  server  gt  lt  asp TextBox gt           lt asp Button ID  Button1  runat  server  Text  Button    gt       lt  div gt   lt  form gt    code behind   Protected Sub Page Load ByVal sender As Object  ByVal e As System EventArgs  Handles Me Load     For Each s As String In Request Form AllKeys         Response Write s  amp        amp  Request Form s   amp    lt br   gt        Next End Sub   Separate HTML page    lt form action  http   localhost MyTestApp Default aspx  method  post  gt       lt input name  TextBox1  type  text  value    id  TextBox1    gt       lt input name  TextBox2  type  password  id  TextBox2    gt       lt input type  submit  name  Button1  value  Button  id  Button1    gt   lt  form gt       and it regurgitates the form values as expected   If this isn t working  as others suggested  use a traffic analysis tool  fiddler  ethereal   because something probably isn t going where you re expecting

User · Answer

Are you sure your HTML form is correct  and does  in fact  do an HTTP POST  I would suggest running Fiddler2  and then trying to log in via your Login aspx  then the remote HTML site  and then comparing the requests that are sent to the server  For me  ASP Net always worked fine -- if HTTP request contains a valid POST  I can get to values using Request Form

User · Answer

You sure can   Create an HTML page with the form in it that will contain the necessary components from the login aspx page  i e  username  etc   and make sure they have the same IDs   For you action  make sure it s a post     You might have to do some code on the login aspx page in the Page Load function to read the form  in the Request Form object  and call the appropriate functions to log the user in  but other than that  you should have access to the form  and can do what you want with it

User · Answer

The Request Form Keys collection will be empty if none of your html inputs have NAMEs  It s easy to forget to put them there after you ve been doing  NET for a while  Just name them and you ll be good to go

User · Answer

Hope this will help - Put this tag in html and   remove your login aspx design content  just write only page directive    and you will get the values in aspx page after submit button click  like this- protected void Page Load object sender  EventArgs e                     if   IsPostBack                        CompleteRegistration                      public void CompleteRegistration                      NameValueCollection nv   Request Form          if  nv Count    0                        string strname   nv  txtbox1                string strPwd   nv  txtbox2

User · Answer

This is very possible   I mocked up 3 pages which should give you a proof of concept    aspx page    lt form id  form1  runat  server  gt       lt div gt           lt asp TextBox ID  TextBox1  runat  server  gt  lt  asp TextBox gt           lt asp TextBox TextMode  password  ID  TextBox2  runat  server  gt  lt  asp TextBox gt           lt asp Button ID  Button1  runat  server  Text  Button    gt       lt  div gt   lt  form gt    code behind   Protected Sub Page Load ByVal sender As Object  ByVal e As System EventArgs  Handles Me Load     For Each s As String In Request Form AllKeys         Response Write s  amp        amp  Request Form s   amp    lt br   gt        Next End Sub   Separate HTML page    lt form action  http   localhost MyTestApp Default aspx  method  post  gt       lt input name  TextBox1  type  text  value    id  TextBox1    gt       lt input name  TextBox2  type  password  id  TextBox2    gt       lt input type  submit  name  Button1  value  Button  id  Button1    gt   lt  form gt       and it regurgitates the form values as expected   If this isn t working  as others suggested  use a traffic analysis tool  fiddler  ethereal   because something probably isn t going where you re expecting

User · Answer

This is very possible   I mocked up 3 pages which should give you a proof of concept    aspx page    lt form id  form1  runat  server  gt       lt div gt           lt asp TextBox ID  TextBox1  runat  server  gt  lt  asp TextBox gt           lt asp TextBox TextMode  password  ID  TextBox2  runat  server  gt  lt  asp TextBox gt           lt asp Button ID  Button1  runat  server  Text  Button    gt       lt  div gt   lt  form gt    code behind   Protected Sub Page Load ByVal sender As Object  ByVal e As System EventArgs  Handles Me Load     For Each s As String In Request Form AllKeys         Response Write s  amp        amp  Request Form s   amp    lt br   gt        Next End Sub   Separate HTML page    lt form action  http   localhost MyTestApp Default aspx  method  post  gt       lt input name  TextBox1  type  text  value    id  TextBox1    gt       lt input name  TextBox2  type  password  id  TextBox2    gt       lt input type  submit  name  Button1  value  Button  id  Button1    gt   lt  form gt       and it regurgitates the form values as expected   If this isn t working  as others suggested  use a traffic analysis tool  fiddler  ethereal   because something probably isn t going where you re expecting

User · Answer

The Request Form Keys collection will be empty if none of your html inputs have NAMEs  It s easy to forget to put them there after you ve been doing  NET for a while  Just name them and you ll be good to go

User · Answer

You sure can   Create an HTML page with the form in it that will contain the necessary components from the login aspx page  i e  username  etc   and make sure they have the same IDs   For you action  make sure it s a post     You might have to do some code on the login aspx page in the Page Load function to read the form  in the Request Form object  and call the appropriate functions to log the user in  but other than that  you should have access to the form  and can do what you want with it

User · Answer

Remove runat  server  parts of data posting posted  aspx page

User · Answer

You sure can   The easiest way to see how you might do this is to browse to the aspx page you want to post to   Then save the source of that page as HTML   Change the action of the form on your new html page to point back to the aspx page you originally copied it from   Add value tags to your form fields and put the data you want in there  then open the page and hit the submit button

User · Answer

The Request Form Keys collection will be empty if none of your html inputs have NAMEs  It s easy to forget to put them there after you ve been doing  NET for a while  Just name them and you ll be good to go

[asp.net] How to POST a FORM from HTML to ASPX page

Examples related to asp.net