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How postback works in ASP.NET
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| <script language="VB" runat="server"> | |
| Sub CreateFile_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) | |
| Dim strFileName As String = funcParam.Value | |
| 'custom code to create a text file | |
| End Sub | |
| </script> | |
| <html> | |
| <head> | |
| <script language="JavaScript"> | |
| //ask for user input and then create file | |
| function CreateFile() { | |
| //get filename from the user | |
| var fileName = prompt('Type the name of the file you want to create:',''); | |
| //if the user clicks on OK and if they have entered something | |
| if ((fileName) && (fileName!="")) { | |
| //save the filename to the hidden form field 'funcParam' | |
| document.forms['myForm'].elements['funcParam'].value = fileName; | |
| //call the postback function with the right ID | |
| __doPostBack('CreateFile',''); | |
| } | |
| } | |
| </script> | |
| </head> | |
| <body> | |
| <form runat="server" id="myForm"> | |
| <a href="javascript:CreateFile();">Create Text file</a> | |
| <asp:linkbutton id="CreateFile" runat="server" onclick="CreateFile_Click" /> | |
| <input type="hidden" runat="server" id="funcParam"> | |
| </form> | |
| </body> | |
| </html> |
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| ... | |
| <asp:linkbutton id="Test" runat="server" text="Create Text file" onclick="Test_Click" visible="false" /> | |
| ... |
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| <html> | |
| <body> | |
| <form name="myForm" method="post" action="test.aspx" id="myForm"> | |
| <input type="hidden" name="__EVENTTARGET" value="" /> | |
| <input type="hidden" name="__EVENTARGUMENT" value="" /> | |
| <input type="hidden" name="__VIEWSTATE" | |
| value="dDwtMTAwOTA0ODU1NTs7PsllCK1DzvZsK0J6OQ2dxKqmEwVs" /> | |
| <script language="javascript"> | |
| <!-- | |
| function __doPostBack(eventTarget, eventArgument) { | |
| var theform = document.myForm; | |
| theform.__EVENTTARGET.value = eventTarget; | |
| theform.__EVENTARGUMENT.value = eventArgument; | |
| theform.submit(); | |
| } | |
| // --> | |
| </script> | |
| <a id="Test" href="javascript:__doPostBack('Test','')">Create Text file</a> | |
| </form> | |
| </body> | |
| </html> |
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| <script language="VB" runat="server"> | |
| Sub Test_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) | |
| 'enter your code to perform | |
| End Sub | |
| </script> | |
| <html> | |
| <body> | |
| <form runat="server" id="myForm"> | |
| <asp:linkbutton id="Test" runat="server" text="Create Text file" onclick="Test_Click" /> | |
| </form> | |
| </body> | |
| </html> |
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https://evagoras.com/2011/02/10/how-postback-works-in-asp-net/