$Web URL Encode and $Web URL Encode Lstr: Difference between revisions
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==Syntax== | ==Syntax== | ||
<p class="syntax"><span class="term">% | <p class="syntax"><span class="term">%out</span> = <span class="literal">$Web_URL_Encode</span>( <span class="term">input_string</span> ) | ||
</p> | </p> | ||
<var>$Web_URL_Encode</var> takes a single string argument and returns that string with special characters encoded using the URL "% hex hex" format | <var>$Web_URL_Encode</var> takes a single string argument and returns that string with special characters encoded using the URL "% hex hex" format. | ||
The only parameter is the input string to be encoded. If this string is omitted, a null string is returned | The only parameter is the input string to be encoded. If this string is omitted, a null string is returned. | ||
<var>$Web_URL_Encode</var> and <var>$Web_URL_Encode_Lstr</var> are useful for composing the isindex string portion of a URL ("HTTP://host/path?isindex") for redirection, or for composing the < | ==Usage notes== | ||
<ul> | |||
<li><var>$Web_URL_Encode_Lstr</var> is identical to <var>$Web_URL_Encode</var> with the exception that it is longstring capable: it can take a longstring input and produce the appropriate longstring output. | |||
<li>For <var>$Web_URL_Encode</var>, if the result of the encoding produces a string longer than 255, the result is truncated, at 255 (or less, if necessary, to avoid producing a partial "% hex hex" sequence). For <var>$Web_URL_Encode_Lstr</var>, no truncation should occur. | |||
<li><var>$Web_URL_Encode</var> and <var>$Web_URL_Encode_Lstr</var> are useful for composing the isindex string portion of a URL ("HTTP://host/path?isindex") for redirection, or for composing the <code>HREF=</code> value in the HTML anchor tag ("<A HREF=..."). | |||
<li><p class="code">* Use <var>$Web_URL_Encode</var> to create % hex hex like browser does with FORM METHOD=GET | |||
printText <form method=get action="{$Web_Hdr_Parm('URL')}"> | printText <form method=get action="{$Web_Hdr_Parm('URL')}"> | ||
printText Use this isindex: <input name=a value=""> | printText Use this isindex: <input name=a value=""> | ||
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%URLENC = $Web_URL_Encode(%INPUTA) | %URLENC = $Web_URL_Encode(%INPUTA) | ||
printText <input type=submit value=Submit> | printText <input type=submit value=Submit> | ||
printText | printText <br><a href="{$Web_Hdr_Parm('URL')}?input={%URLENC}">Click here for same result</a> | ||
printText | |||
printText | printText <br><hr><br> | ||
printText <xmp> | |||
printText PARM a:{%INPUTA} | printText PARM a:{%INPUTA} | ||
printText URLENC:{%URLENC} | printText URLENC:{%URLENC} | ||
printText | printText </xmp> | ||
</p> | </p> | ||
If you enter the following into the form: | If you enter the following into the form: | ||
<p class="code">10 + 3.14 * R*R*R * 2/3 | <p class="code">10 + 3.14 * R*R*R * 2/3 | ||
</p> | </p> | ||
The value displayed after URLENC is: | The value displayed after URLENC is: | ||
<p class="code">10+%2B+3.14+*+R*R*R+*+2%2F3 | <p class="code">10+%2B+3.14+*+R*R*R+*+2%2F3 | ||
</p> | </p> | ||
<code>+</code> is used to stand for a blank, <code>%</code> introduces a hex encoding,<code>2B</code> is the ASCII code for <code>+</code>, and <code>2F</code> is the ASCII code for a forward slash ( / ). (Note: this is a subtle and tricky example.) Using Netscape 4.5 as the guide, the 4 non-alphanumerics that are ''not'' encoded are underscore ( _ ), hyphen ( - ), asterisk ( * ), and period ( . ). | <code>+</code> is used to stand for a blank, <code>%</code> introduces a hex encoding,<code>2B</code> is the ASCII code for <code>+</code>, and <code>2F</code> is the ASCII code for a forward slash ( / ). (Note: this is a subtle and tricky example.) Using Netscape 4.5 as the guide, the 4 non-alphanumerics that are ''not'' encoded are underscore ( _ ), hyphen ( - ), asterisk ( * ), and period ( . ). | ||
</ul> | |||
[[Category:Janus Web Server $functions|$Web_URL_Encode and $Web_URL_Encode_Lstr]] | [[Category:Janus Web Server $functions|$Web_URL_Encode and $Web_URL_Encode_Lstr]] | ||
Latest revision as of 01:26, 16 April 2013
Do web URL encoding
$Web_URL_Encode and $Web_URL_Encode_Lstr encode special characters into the URL "% hex hex" format, which has particular use constructing isindex strings for anchor tags or redirection.
Syntax
%out = $Web_URL_Encode( input_string )
$Web_URL_Encode takes a single string argument and returns that string with special characters encoded using the URL "% hex hex" format.
The only parameter is the input string to be encoded. If this string is omitted, a null string is returned.
Usage notes
- $Web_URL_Encode_Lstr is identical to $Web_URL_Encode with the exception that it is longstring capable: it can take a longstring input and produce the appropriate longstring output.
- For $Web_URL_Encode, if the result of the encoding produces a string longer than 255, the result is truncated, at 255 (or less, if necessary, to avoid producing a partial "% hex hex" sequence). For $Web_URL_Encode_Lstr, no truncation should occur.
- $Web_URL_Encode and $Web_URL_Encode_Lstr are useful for composing the isindex string portion of a URL ("HTTP://host/path?isindex") for redirection, or for composing the
HREF=value in the HTML anchor tag ("<A HREF=..."). * Use $Web_URL_Encode to create % hex hex like browser does with FORM METHOD=GET printText <form method=get action="{$Web_Hdr_Parm('URL')}"> printText Use this isindex: <input name=a value=""> %INPUTA = $Web_Parm('a') %URLENC = $Web_URL_Encode(%INPUTA) printText <input type=submit value=Submit> printText <br><a href="{$Web_Hdr_Parm('URL')}?input={%URLENC}">Click here for same result</a> printText <br><hr><br> printText <xmp> printText PARM a:{%INPUTA} printText URLENC:{%URLENC} printText </xmp>
If you enter the following into the form:
10 + 3.14 * R*R*R * 2/3
The value displayed after URLENC is:
10+%2B+3.14+*+R*R*R+*+2%2F3
+is used to stand for a blank,%introduces a hex encoding,2Bis the ASCII code for+, and2Fis the ASCII code for a forward slash ( / ). (Note: this is a subtle and tricky example.) Using Netscape 4.5 as the guide, the 4 non-alphanumerics that are not encoded are underscore ( _ ), hyphen ( - ), asterisk ( * ), and period ( . ).