A few useful JS functions

js| function//judge is not number create by qiujy
function Isnumber (str) {
var flag = true;

for (i = 0; i < str.length; i++) {
var ch = elementvalue.charat (i);
if (Ch > ' 9 ' | | | ch < ' 0 ') {
Flag = false;
Break
}
}

return flag;
}

To determine if it is empty
function IsEmpty (str) {
if (Str.length = = 0) {
return true;
}
return false;
}

For select, verify that it must have a value option selected, otherwise return false
function Checkselect (SEL) {
var flag = false;
for (i = 0;i < sel.options.length;i++) {
var op = sel.options[i];
if (Op.value!= "" && op.selected = = True) {
Flag = true;
}
}
return flag;
}

For multiple checkbox, verify that it must have at least one selected, otherwise return false
function Checkcheckbox (che) {
var result = false;
if ((typeof che.length) = = "Number") {
for (i = 0;i < Che.length; i++) {
if (che[i].checked) {
return true;
}
}
}else{
Alert ("ok!");
alert (che.checked);
if (che.checked) {
return true;
}
}
return result;
}

Verify the validity of the set password
Call the sample
<input type= "text" name= "UserName" >
<input type= "text" name= "userName2" >
<input name= "Submit2" type= "button" class= "NIU1" value= "Detection" >

function Checkpassword (STR1,STR2) {
if (Str1.length = = 0) {
Alert ("Password cannot be blank");
return false;
}
if (Str1.length > | | str1.length < 4) {
Alert ("Please set password length to 4-18 bits!");
return false;
}
Password verification
if (str1!= str2) {
Alert ("Two input passwords are inconsistent!");
return false;
}
return true;
}

Email format Check
function Checkemailformat (str) {
var reg =/^[_\.0-9a-z-]+@ ([0-9a-z][0-9a-z-]+\.) +[a-z]{2,3}$/;
var result = Str.match (reg);
if (result = = null)
{
Alert (' Please enter the correct email address ');
return false;
}
return true;
}

User name format check, allow numbers, letters, slide line
function Checkuseridformat (str) {
var reg =/\w/;
var result = Str.match (reg);
if (result = = null)
{
return false;
}
return true;
}

Input control
Invoke Sample: <input onkeypress= "Inputcontrl (' digit ')" name = "UserName" >
function Inputcontrl (inputmod) {
Inputmod can be combined input: "Chinese,letter,digit"
if (inputmod== "" | | Inputmod==null) Event.returnvalue=false;
Inputmod=inputmod.tolowercase ();
var gflag = false;

It's only numbers.
if (Inputmod.indexof ("digit")!=-1&&gflag==false)
if (event.keycode>=48&&event.keycode<=57) gflag=true;

can only be Chinese
if (Inputmod.indexof ("Chinese")!=-1&&gflag==false)
if (event.keycode>=256) gflag=true;

Only the letters.
if (Inputmod.indexof ("letter")!=-1&&gflag==false)
if ((event.keycode>=65&&event.keycode<=90) | | (event.keycode>=97&&event.keycode<=122))
Gflag=true;

can only be amount (numbers and decimal points)
if (Inputmod.indexof ("Money")!=-1&&gflag==false)
if (event.keycode<=57 && event.keycode>=48 | | event.keycode==46 | | event.keycode = = 44)
Gflag=true;

Can only be the specified symbol
if (Inputmod.indexof ("symbol")!=-1&&gflag==false) {
Alert ("Running Here");
if (event.keycode== ' _ ' | | | event.keycode== '-')
Gflag=true;
}
Event.returnvalue = Gflag;
}

Check to see if there are any Chinese in the string
function Check_chinese (str) {
for (Var i=0;i<str.length;i++) {
var c=str.charcodeat (i);
if (C > 0x4e00 && C < 0x9fa5) {
Alert ("User name contains Chinese: [" +str.charat (i) + "]");
return false;
}
}
return true;
}

Verify that the string is not the amount of money
function Check_money (str) {
var re =/^ (\d+|[ 1-9]) \. {0,1}\d{0,2}$/;
if (!re.test (str)) {
Alert ("The number of amounts entered is incorrect!") Example: 123 or 123.45 ");
return false;
}
return true;
}

================2006 year February 27 increased ======================

The selected select option moves from the Drop-down list named Srcselect to the Drop-down list named Desselect.

Function Moveoption (srcselect,desselect) {
 srclen = srcSelect.options.length;
 deslen = DesSelect.options.length;
 for (i=0;i<srclen;i++) {
  optionobj = srcselect.options[i];
  if (optionobj.selected) {
   text = Optionobj.text;
   value = Optionobj.value;
   desselect.options[deslen++] = new Option (text,value);
  }
 }
 for (i=srclen-1;i>=0;i--) {
  optionobj = srcselect.options[i];
  if (optionobj.selected) {
   optionobj.selected = false;
   srcselect.options[i] = null;
  }
 }
}

The Select option moves up and down (obj is the ID of Select, index:-1 represents up; 1 means move Down)
function Changepos (obj,index)
{
if (index==-1) {
if (obj.selectedindex>0) {
Obj.options (Obj.selectedindex). SwapNode (Obj.options (obj.selectedindex-1))
}
}
else if (index==1) {
if (obj.selectedindex<obj.options.length-1) {
Obj.options (Obj.selectedindex). SwapNode (Obj.options (obj.selectedindex+1))
}
}
}