After a period of programming, I felt that these javascript programs were relatively long-used, so I sorted them out. Some of them determined whether they were null, numbers, amounts, and time. Such as those that can be written to JS, which simplifies the page much better. <HTML>
<Head>
<Meta http-equiv = "Content-Type" content = "text/html; charset = gb2312">
<Title> untitled document </title>
<Script language = "JavaScript">
Remove Spaces
Function trim (STR ){
If (Str. charat (0) = ""){
STR = Str. Slice (1 );
STR = trim (STR );
}
Return STR;
}
Judge whether it is empty
Function isempty (pobj, errmsg ){
VaR OBJ = eval (pobj );
If (OBJ = NULL | trim (obj. Value) = ""){
If (errmsg = NULL | errmsg = "")
Alert ("input is empty! ");
Else
Alert (errmsg );
OBJ. Focus ();
Return false;
}
Return true;
}
Determine if it is a number
Function isnumber (pobj, errmsg ){
VaR OBJ = eval (pobj );
Strref = "1234567890 ";
If (! Isempty (pobj, errmsg) return false;
For (I = 0; I <obj. value. length; I ++ ){
Tempchar = obj. value. substring (I, I + 1 );
If (strref. indexof (tempchar, 0) =-1 ){
If (errmsg = NULL | errmsg = "")
Alert ("data does not meet requirements, please check ");
Else
Alert (errmsg );
If (obj. type = "text ")
OBJ. Focus ();
Return false;
}
}
Return true;
} // Determine whether it is a number. The number can be negative.
Function isnegative (pobj, errmsg ){
VaR OBJ = eval (pobj );
Strref = "1234567890 -";
If (! Isempty (pobj, errmsg) return false;
For (I = 0; I <obj. value. length; I ++ ){
Tempchar = obj. value. substring (I, I + 1 );
If (strref. indexof (tempchar, 0) =-1 ){
If (errmsg = NULL | errmsg = "")
Alert ("data does not meet requirements, please check ");
Else
Alert (errmsg );
If (obj. type = "text ")
OBJ. Focus ();
Return false;
} Else {
If (I> 0 ){
If (obj. value. substring (I, I + 1) = "-"){
If (errmsg = NULL | errmsg = "")
Alert ("data does not meet requirements, please check ");
Else
Alert (errmsg );
If (obj. type = "text ")
OBJ. Focus ();
Return false;
}
}
}
}
Return true;
} Determine whether it is a form of money
Function ismoney (pobj, errmsg ){
VaR OBJ = eval (pobj );
Strref = "1234567890 .";
If (! Isempty (pobj, errmsg) return false;
For (I = 0; I <obj. value. length; I ++ ){
Tempchar = obj. value. substring (I, I + 1 );
If (strref. indexof (tempchar, 0) =-1 ){
If (errmsg = NULL | errmsg = "")
Alert ("data does not meet requirements, please check ");
Else
Alert (errmsg );
If (obj. type = "text ")
OBJ. Focus ();
Return false;
} Else {
Templen = obj. value. indexof (".");
If (templen! =-1 ){
Strlen = obj. value. substring (templen + 1, obj. value. Length );
If (strlen. length> 2 ){
If (errmsg = NULL | errmsg = "")
Alert ("data does not meet requirements, please check ");
Else
Alert (errmsg );
If (obj. type = "text ")
OBJ. Focus ();
Return false;
}
}
}
}
Return true;
} Function isleapyear (year)
{
If (Year % 4 = 0 & amp; Year % 100! = 0) | (Year % 400 = 0 ))
{
Return true;
}
Return false;
} // Determine whether the time is correct Function isdate (checktext ){
VaR datetime;
VaR year, month, day;
VaR gone, gtwo;
If (TRIM (checktext. Value )! = ""){
Datetime = trim (checktext. value );
If (datetime. Length = 10 ){
Year = datetime. substring (0, 4 );
If (isnan (year) = true ){
Alert ("Enter the date! Format: (yyyy-mm-dd)/n )! ");
Checktext. Focus ();
Return false;
}
Gone = datetime. substring (4, 5 );
Month = datetime. substring (5, 7 );
If (isnan (month) = true ){
Alert ("Enter the date! Format: (yyyy-mm-dd)/n )! ");
Checktext. Focus ();
Return false;
}
Gtwo = datetime. substring (7,8 );
Day = datetime. substring (8, 10 );
If (isnan (day) = true ){
Alert ("Enter the date! Format: (yyyy-mm-dd)/n )! ");
Checktext. Focus ();
Return false;
}
If (gone = "-") & (gtwo = "-")){
If (month <1 | month> 12 ){
Alert ("the month must be between 01 and 12! ");
Checktext. Focus ();
Return false;
}
If (day <1 | day> 31 ){
Alert ("the date must be between 01 and 31! ");
Checktext. Focus ();
Return false;
} Else {
If (month = 2 ){
If (isleapyear (year) & day> 29 ){
Alert ("the February date must be between 01 and 29! ");
Checktext. Focus ();
Return false;
}
If (! Isleapyear (year) & day> 28 ){
Alert ("the February date must be between 01 and 28! ");
Checktext. Focus ();
Return false;
}
}
If (month = 4 | month = 6 | month = 9 | month = 11) & (day> 30 )){
Alert ("in four, six, nine, February/n dates must be between 01 and 30! ");
Checktext. Focus ();
Return false;
}
}
} Else {
Alert ("Enter the date! Format: (yyyy-mm-dd)/n )");
Checktext. Focus ();
Return false;
}
} Else {
Alert ("Enter the date! Format: (yyyy-mm-dd)/n )");
Checktext. Focus ();
Return false;
}
} Else {
Return true;
}
Return true;
} </SCRIPT> <Script language = "JavaScript">
Function checked (theform ){
If (! Isempty (theform. AA, 'Enter the data') return false;
}
</SCRIPT>
</Head>
<Body>
<Form method = "Post" Action = "" name = "DD" onsubmit = "Return checked (this);">
Determine whether to input data <input type = "text" name = "AA"> <br>
Judge quantity <input type = "text" name = "BB" onchange = "Return isnumber (this,''); "> <br> Determines the quantity. The value can be negative. <input type = "text" name = "DD" onchange = "Return isnegative (this,''); "> <br> Determine the amount <input type = "text" name = "cc" onchange = "Return ismoney (this,''); "> <br> Judgment time <input type = "text" name = "ee" onchange = "Return isdate (this)"> <br>
<Input type = "Submit" value = "Submit">
</Form>
</Body>
</Html> |
