Implementation of large-capacity data submission method by ASP

Previously encountered a problem in the work, when the form sent a large amount of data, it will be an error. Check out MSDN to learn that Microsoft is limited to 100K bytes for the maximum data that can be received with Request.Form ().

Microsoft recommends using Request.BinaryRead () to read form data, but because this method reads binary data, it needs to parse the read out bytes, generating a meaningful string (a program on MSDN is written like this, However, it does not take into account the need for special analysis of escape characters such as punctuation. If this approach is barely available for a pure English system, for the Chinese system has great trouble, because the Chinese character is expressed in two bytes, and read the binary data itself can not be judged in English or Chinese characters (otherwise it is not binary data, but the string of ^). In this way, we must understand the coding rules of Chinese characters in order to analyze. Finally, even if the algorithm can analyze all of these, we think of a MB-level mega-string analysis by Byte, how efficient? So, blocked!

But there is always a way. At first I thought it was the sum of the form's data cannot exceed 100KB, which was later found to be a restriction on each field within the form. The solution to the problem is that, for a domain that needs to send large data, the data is split into a number of smaller than the limit before submitting the form, placed in several hidden fields, and emptied of the original field, then formally submits the form. Server-side or with Request.Form () read the data of each hidden field, and then in order to put them together on the line. The main code is as follows:

Note: You need to specify a div within the HTML code in the form to dynamically insert the hidden field into it.

= = = Client Sample Code = = =

The following are the referenced contents: <script language=javascript> file://data splits and places them in the corresponding hidden field, triggering in the onsubmit event of the form function Fnprehandle () { var icount; How many fields file://split into var strdata; file://Raw Data var imaxchars = 50000;//The maximum number of characters in a field is limited to 50K, taking into account that Chinese characters are double-byte var Ibottleneck = 2000000;//If the article is more than 2M words, you need to prompt the user var strhtml;//raw Data Strdata = frmtest.bigfield.value;//If the article is too long, you need to remind the user if (Strdata.length > Ibottleneck) { If confirm ("the article you are publishing is too long, it is recommended that you split it into several sections and publish separately.") \ NAND If you insist on submitting, note that it will take a long time to commit successfully. \ n \ ndo you insist on submitting? ") = = False) return false; }icount = parseint (strdata.length/imaxchars) + 1;//hdncount record How many subdomains the original data field is split into strhtml = "<input type=hidden name=hdncount value=" + icount + ">";//Generate HTML code for each child domain for (var i = 1; I <= icount; i++) { strHTML = strhtml + "\ n" + "<input type=hidden Name=hdnbigfield" + i + ">"; }//HTML code for dynamically inserting hidden fields within div (divhidden) in form Document.all.divHidden.innerHTML = strhtml;//Assign values to each subdomain for (var i = 1; I <= icount; i++) { frmtest.elements["Hdnbigfield" + I].value = strdata.substring ((i-1) * Imaxchars, I * imaxchars); }//Original Data field empty FrmTest.BigField.value = ""; } </SCRIPT>

= = = = = Server-side Sample Code = =

The following are the referenced contents: <% Dim strdata Dim Intfieldcount Dim Iintfieldcount = Request.Form ("Hdncount") for I=1 to Intfieldcount strdata = strdata & Request.Form ("Hdnbigfield" & i) Nextresponse.write strdata %>