ASP FAQs and Answers (11)

FAQ | Common JavaScript function for problems
//=========================================
Input data validation
Checking for null values
function Funcheckempty (m_text) {
var strtmp=m_text
if (strtmp = null | | strtmp = = "") {
return False
}
return True
}



Check the length of the content
function Funtextlencheck (m_text) {
var strtext=m_text
for (i=0;i<=strtext.length-1;i++) {
if (Strtext.charcodeat (i) >=256) {
Return Strtext.length * 2
}
}
Return strtext.length
}


Inspection length
function Funchecklen (m_len,m_text) {
if (Funtextlencheck (m_text) > M_len) {
return False
}
return True
}

Test is a number
function Funchecknumber (m_text) {
var strtmp=m_text
if (isNaN (strtmp)) {
return False
}
return True
}


Whether the date of inspection is legal
function Funcheckdate (m_year,m_month,m_day) {
Get the maximum date according to the month first
var maxday
if (m_month==2) {
Maxday=28
if (m_year% 4 ==0) {
maxday=29
}
} else {
if (m_month<=7) {
if (m_month% 2 ==0) {
Maxday=30
}else{
Maxday=31
}
}else{
if (m_month% 2 ==0) {
Maxday=31
}else{
Maxday=30
}
}
}
if (m_day>maxday) {
return False
}
return True
}

Read cookies information
function GetCookie (strcookname) {
var arvcookies=document.cookie.split (";")
for (var i=0;i< arvcookies.length; i++) {
var arvonecookie=arvcookies[i].split ("=")
if (Strcookname==arvonecookie[0]) {
Return unescape (Arvonecookie[1])
}
}
Return ""
}

To replace an illegal character in a string
function Replace_text (Text) {
var strtmp=text
Strtmp=strtmp.replace ("@", "@")
Strtmp=strtmp.replace ("?", "? ")
Strtmp=strtmp.replace ("&", "&")
Strtmp=strtmp.replace ("'", "" ")
Strtmp=strtmp.replace ("<", "" ")
Strtmp=strtmp.replace (">", "")
Return strtmp

}


function Check_password (text) {
var strtmp=text
if (Strtmp.indexof ("") >-1) {
Return "'"
}
if (Strtmp.indexof ("?") &GT;-1) {
Return "?"
}
if (Strtmp.indexof ("&") >-1) {
Return "&"
}
if (Strtmp.indexof ("<") >-1) {
Return "<"
}
if (Strtmp.indexof (">") >-1) {
Return ">"
}
Return ""

}


function Check_url (text) {
var strtmp=text
if (Strtmp.indexof ("") >-1) {
return False
}
return True
}

Focus Control
function Document.onkeydown () {
var e = event.srcelement;
if (Event.keycode = && e.tagname = "INPUT" && e.type = = "Text") {
Event.keycode = 9;
}

}





<% Response.Write "
1.oncontextmenu= "Window.event.returnvalue=false" will completely mask the right mouse button
<tableborderoncontextmenu=return (False) ><td>no</table> available for table
2.<bodyonselectstart= "Returnfalse" > Deselect, Prevent replication
3.onpaste= "Returnfalse" is not allowed to paste
4.oncopy= "Returnfalse;" Oncut= "Returnfalse;" Prevent replication
5.<linkrel= "Shortcuticon" href= "Favicon.ico" >ie address bar in front of its own icon
6.<linkrel= "Bookmark" href= "Favicon.ico" > can display your icon in a Favorites folder
7.<inputstyle= "ime-mode:disabled" > Close IME
8. Always with the frame
<scriptlanguage= "JavaScript" ><!--
if (window==top) top.location.href= "frames.htm";//frames.htm for frames page
--></script>
9. Prevent a person from being frame
<scriptlanguage=javascript><!--
if (top.location!=self.location) top.location=self.location;
--></script>
10.<noscript><iframesrc=*.html></iframe></noscript> Web pages will not be saved as
11.<inputtype=buttonvalue= View Web page source code
onclick= "Window.location=view-source:+ http://www.csdn.net/";;;; >
12. How to use the ASP means to check whether the visitor used the agent
<%ifrequest.servervariables ("http_x_forwarded_for") <> "" Then
Response.Write "<fontcolor= #ff000