How to solve the problem that the Ajax submission parameter value contains html tags and cannot be submitted successfully?

This article mainly introduces the solution to the problem that the value of the Ajax submission parameter with the html tag cannot be submitted successfully (ASP.NET). It is very good and has reference value. Friends who need it can refer to it. I hope it can help everyone.

This function is similar to using a rich text editor to publish information, but uses Ajax to submit data, so the submitted parameter value inevitably contains html tags.

There has been no problem running the code locally and the submission can always be successful. However, when the code is deployed online, the data cannot be submitted successfully. I was stuck for a long time and it took me a long time to find the problem.

The reason why the submission was unsuccessful is because my submission data contains html tags, and my target address cannot be directly requested.

The solution is as follows:

1. Use JS’s Base64 encoding (similar to encryption) with the parameter value of the html tag on the page.

2. After obtaining the data at the target address, use the background Base64 decoding method to decode the obtained data.

The following is the Base64 encoding and decoding method code of my JS:

//下面是64个基本的编码
 var base64EncodeChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
 var base64DecodeChars = new Array(
   -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63,
   52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1,
   -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
   15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,
   -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
   41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1);
 //编码的方法
 function base64encode(str) {
     var out, i, len;
    var c1, c2, c3;
     len = str.length;
    i = 0;
    out = "";
    while(i < len) {
       c1 = str.charCodeAt(i++) & 0xff;
       if(i == len)
       {
             out += base64EncodeChars.charAt(c1 >> 2);
             out += base64EncodeChars.charAt((c1 & 0x3) << 4);
           out += "==";
            break;
          }
      c2 = str.charCodeAt(i++);
       if(i == len)
         {
           out += base64EncodeChars.charAt(c1 >> 2);
            out += base64EncodeChars.charAt(((c1 & 0x3)<< 4) | ((c2 & 0xF0) >> 4));
             out += base64EncodeChars.charAt((c2 & 0xF) << 2);
             out += "=";
            break;
          }
       c3 = str.charCodeAt(i++);
       out += base64EncodeChars.charAt(c1 >> 2);
      out += base64EncodeChars.charAt(((c1 & 0x3)<< 4) | ((c2 & 0xF0) >> 4));
       out += base64EncodeChars.charAt(((c2 & 0xF) << 2) | ((c3 & 0xC0) >>6));
       out += base64EncodeChars.charAt(c3 & 0x3F);
       }
     return out;
   }
 //解码的方法
 function base64decode(str) {
     var c1, c2, c3, c4;
    var i, len, out;
     len = str.length;
     i = 0;
  out = "";
     while(i < len) {
      do {
          c1 = base64DecodeChars[str.charCodeAt(i++) & 0xff];
        } while(i < len && c1 == -1);
       if(c1 == -1)
         break;
      do {
          c2 = base64DecodeChars[str.charCodeAt(i++) & 0xff];
        } while(i < len && c2 == -1);
       if(c2 == -1)
          break;
      out += String.fromCharCode((c1 << 2) | ((c2 & 0x30) >> 4));
      do {
          c3 = str.charCodeAt(i++) & 0xff;
          if(c3 == 61)
            return out;
          c3 = base64DecodeChars[c3];
        } while(i < len && c3 == -1);
       if(c3 == -1)
          break;
       out += String.fromCharCode(((c2 & 0XF) << 4) | ((c3 & 0x3C) >> 2));
     do {
          c4 = str.charCodeAt(i++) & 0xff;
           if(c4 == 61)
            return out;
          c4 = base64DecodeChars[c4];
         } while(i < len && c4 == -1);
      if(c4 == -1)
          break;
       out += String.fromCharCode(((c3 & 0x03) << 6) | c4);
      }
     return out;
   }
 function utf16to8(str) {
     var out, i, len, c;
     out = "";
    len = str.length;
    for(i = 0; i < len; i++) {
      c = str.charCodeAt(i);
      if ((c >= 0x0001) && (c <= 0x007F)) {
          out += str.charAt(i);
        } else if (c > 0x07FF) {
           out += String.fromCharCode(0xE0 | ((c >> 12) & 0x0F));
            out += String.fromCharCode(0x80 | ((c >> 6) & 0x3F));
           out += String.fromCharCode(0x80 | ((c >> 0) & 0x3F));
         } else {
            out += String.fromCharCode(0xC0 | ((c >> 6) & 0x1F));
             out += String.fromCharCode(0x80 | ((c >> 0) & 0x3F));
          }
       }
    return out;
   }
 function utf8to16(str) {
   var out, i, len, c;
    var char2, char3;
    out = "";
    len = str.length;
   i = 0;
    while(i < len) {
     c = str.charCodeAt(i++);
    switch(c >> 4)
       { 
      case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7:
          // 0xxxxxxx
          out += str.charAt(i-1);
          break;
         case 12: case 13:
          // 110x xxxx  10xx xxxx
          char2 = str.charCodeAt(i++);
         out += String.fromCharCode(((c & 0x1F) << 6) | (char2 & 0x3F));
         break;
        case 14:
         // 1110 xxxx 10xx xxxx 10xx xxxx
         char2 = str.charCodeAt(i++);
          char3 = str.charCodeAt(i++);
           out += String.fromCharCode(((c & 0x0F) << 12) |
                  ((char2 & 0x3F) << 6) |
                  ((char3 & 0x3F) << 0));
          break;
        }
       }
    return out;
  }

The page calls the JS method to perform Base64 encoding code as follows:

 var articleContent = editor.getContent();
   articleContent = base64encode(utf16to8(articleContent));

But, I encountered another one New problem. After using JS to Base64 encode the data, JS actually replaced the plus sign (+) with a space, causing the data decoded by my background method to be incorrect.

The solution is as follows:

I first used the JS method replace() method to replace, but there was an error. JS just replaced my first space with a plus sign (+). The final solution is as follows.

In the background (under the target receiving address), replace spaces with plus signs (+) for the obtained data. The code is as follows:              

string content = Request["content"].ToString();
      if (content.Contains(""))
        {
          content=content.Replace(" ", "+");
        }
      //byte[] sa = Convert.FromBase64String(content);
      //Encoding Ansi = Encoding.GetEncoding("GB2312");
      // content = Ansi.GetString(sa);
      content = Base64Decrypt(content);//Base64解码

                                                                      ’ ’ s ’ ’ dle to ” ” ” ” ”                                                     off off off ’s           out out out out out out out Out Out out ’'s ’ ’ s ’ ‐ ‐‐‐‐‐‐‐ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​Detailed explanation and supplementary example

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