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JavaScript user Registration Password strength test

Source: Internet
Author: User
Keywords Web page production Ajax javascript
Tags ajax document function how many html http javascript password
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<! DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 transitional//en" "Http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd ">


<html xmlns= "http://www.jzread.com/1999/xhtml" >


<head id= "Head1" runat= "Server" >


<title> Password strength test </title>


</head>


<script language= "javascript" type= "Text/javascript" >


//charmode function


//test what kind of character it belongs to.


function Charmode (in) {


if (in>=48 && in <=57)//Digital


return 1;


if (in>=65 && in <=90)//Capital Letter


return 2;


if (in>=97 && in <=122)//lowercase


return 4;


Else


return 8; Special character


}


//bittotal function


//Calculates how many patterns there are in the current password


function bittotal (num) {


modes=0;


for (i=0;i<4;i++) {


if (num & 1) modes++;


num>>>=1;


}


return modes;


}


//checkstrong function


//Returns the strength level of the password


function Checkstrong (sPW) {


if (spw.length<=4)


return 0; Password is too short


modes=0;


for (i=0;i<spw.length;i++) {


//test the category of each character and count how many patterns there are.


Modes|=charmode (Spw.charcodeat (i));


}


return Bittotal (Modes);


}


//pwstrength function


////When the user releases the keyboard or password input box to lose focus, display different colors according to different levels


function Pwstrength (pwd) {


o_color= "#e0f0ff";


l_color= "#FF0000";


m_color= "#FF9900";


h_color= "#33CC00";


if (pwd==null| | pwd== ') {


Lcolor=mcolor=hcolor=o_color;


}


Else


{


S_level=checkstrong (PWD);


//alert (S_level);


switch (s_level)


{


Case 0:


Lcolor=mcolor=hcolor=o_color;


Case 1:


Lcolor=l_color;


Mcolor=hcolor=o_color;


break;


Case 2:


Lcolor=mcolor=m_color;


Hcolor=o_color;


break;


Default:


Lcolor=mcolor=hcolor=h_color;


}


}


document.getElementById ("strength_l"). Style.background=lcolor;


document.getElementById ("Strength_m"). Style.background=mcolor;


document.getElementById ("Strength_h"). Style.background=hcolor;


return;


}


</script>


<body>


<form id= "Form1" >


<div>


Enter Password: <input type= "text" id= "TextBox1" onkeyup= "Pwstrength (this.value)" onblur= "Pwstrength (this.value)" >< Br>


Password Strength:


<table border= "1" cellpadding= "1" bordercolordark= "#fdfeff" bordercolorlight= "#99ccff"


cellspacing= "1" style= "width:200px; Display:inline; Background-color: #e0f0ff ">


<tr>


<td id= "strength_l style=" width:100px; HEIGHT:19PX "align=" center ">


Weak


</td>


<td id= "Strength_m style=" width:100px; HEIGHT:19PX "align=" center ">





</td>


<td id= "Strength_h style=" width:100px; HEIGHT:19PX "align=" center ">


Strong


</td>


</tr>


</table>


</div>


</form>


</body>


</html>

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