来自google的密码强度javascript验证代码_javascript教程

  1 <script type=”text/javascript”>
  2 var agt = navigator.userAgent.toLowerCase();
  3 var is_op = (agt.indexOf(“opera”) != -1);
  4 var is_ie = (agt.indexOf(“msie”) != -1) && document.all && !is_op;
  5 var is_ie5 = (agt.indexOf(“msie 5”) != -1) && document.all && !is_op;
  6
  7 function CreateXmlHttpReq(handler) {
  8   var xmlhttp = null;
  9   if (is_ie) {
 10     var control = (is_ie5) ? “Microsoft.XMLHTTP” : “Msxml2.XMLHTTP”;
 11     try {
 12       xmlhttp = new ActiveXObject(control);
 13       xmlhttp.onreadystatechange = handler;
 14     } catch (ex) {
 15       alert(“You need to enable active scripting and activeX controls”); 
 16     }
 17
 18   } else {
 19     xmlhttp = new XMLHttpRequest();
 20     xmlhttp.onload = handler;
 21     xmlhttp.onerror = handler;
 22   }
 23   return xmlhttp;
 24 }
 25
 26
 27 function XmlHttpPOST(xmlhttp, url, data) {
 28   try {
 29     xmlhttp.open(“POST”, url, true);
 30     xmlhttp.setRequestHeader(“Content-Type”, “application/x-www-form-urlencoded; charset=UTF-8”);
 31     xmlhttp.send(data);
 32
 33   } catch (ex) {
 34     // do nothing
 35   }
 36 }
 37
 38
 39 var myxmlhttp;
 40 ratingMsgs = new Array(6);
 41 ratingMsgColors = new Array(6);
 42 barColors = new Array(6);
 43
 44 ratingMsgs[0] = “太短”;
 45 ratingMsgs[1] = “弱”;
 46 ratingMsgs[2] = “一般”;
 47 ratingMsgs[3] = “很好”;
 48 ratingMsgs[4] = “极佳”;
 49 ratingMsgs[5] = “未评级”;
 50
 51 ratingMsgColors[0] = “#676767”;
 52 ratingMsgColors[1] = “#aa0033”;
 53 ratingMsgColors[2] = “#f5ac00”;
 54 ratingMsgColors[3] = “#6699cc”;
 55 ratingMsgColors[4] = “#008000”;
 56 ratingMsgColors[5] = “#676767”;
 57
 58 barColors[0] = “#dddddd”;
 59 barColors[1] = “#aa0033”;
 60 barColors[2] = “#ffcc33”;
 61 barColors[3] = “#6699cc”;
 62 barColors[4] = “#008000”;
 63 barColors[5] = “#676767”;
 64
 65 function CreateRatePasswdReq ()
 66 {
 67 var passwd = getElement(Passwd).value;
 68 var email = getElement(Email).value;
 69 var lastname = getElement(LastName).value;
 70 var firstname = getElement(FirstName).value;
 71 var min_passwd_len = 6;
 72
 73
 74 if (passwd.length < min_passwd_len) 
 75 {
 76   if (passwd.length > 0)
 77   {
 78     DrawBar(0);
 79   }
 80   else
 81   {
 82     ResetBar();
 83   }
 84 }
 85 else
 86 {
 87     passwd = escape(passwd);
 88     var params = Passwd=+passwd+&Email=+email+&FirstName=+firstname+&LastName=+lastname;
 89     myxmlhttp = CreateXmlHttpReq(RatePasswdXmlHttpHandler);
 90     XmlHttpPOST(myxmlhttp, “https://www.google.com/accounts/RatePassword“, params);
 91 }
 92 }
 93
 94 function getElement(name)
 95 {
 96   if (document.all)
 97   {
 98       return document.all(name);
 99   }
100   return document.getElementById(name);
101 }
102
103 function RatePasswdXmlHttpHandler()
104 { // Cant check status since safari doesnt support it
105   if (myxmlhttp.readyState != 4)
106   {
107   return;
108   }
109   rating = parseInt(myxmlhttp.responseText);
110   DrawBar(rating);
111 }
112
113 function DrawBar(rating)
114 {
115 var posbar = getElement(posBar);
116 var negbar = getElement(negBar);
117 var passwdRating = getElement(passwdRating);
118 var barLength = getElement(passwdBar).width;
119
120 if (rating >= 0 && rating <= 4)
121 {       //We successfully got a rating
122     posbar.style.width = barLength / 4 * rating + “px”;
123     negbar.style.width = barLength / 4 * (4 – rating) + “px”;
124 }
125 else
126 {
127     posbar.style.width = “0px”;
128     negbar.style.width = barLength + “px”;
129     rating = 5; // Not rated Rating
130 }
131 posbar.style.background = barColors[rating]
132 passwdRating.innerHTML = “<font color=” + ratingMsgColors[rating] +”>” + ratingMsgs[rating] + “</font>”;
133 }
134
135
136   //Resets the password strength bar back to its initial state without any message showing.
137   function ResetBar()
138   {
139     var posbar = getElement(posBar);
140     var negbar = getElement(negBar);
141     var passwdRating = getElement(passwdRating);
142     var barLength = getElement(passwdBar).width;
143
144     posbar.style.width = “0px”;
145     negbar.style.width = barLength + “px”;
146     passwdRating.innerHTML = “”;
147   }
148
149 </script>
150
151 <table width=”60%”  border=”0″>
152     <tr>
153         <td width=”30%”>
154             <input type=”hidden” value=”” id=”FirstName” size=”30″>
155             <input type=”hidden” value=”” id=”LastName” size=”30″>
156             <input type=”hidden” id=”Email” value=”” size=”30″>
157             <input type=”password” id=”Passwd” value=”” onkeyup=”CreateRatePasswdReq()” size=”30″>
158         </td>
159         <td width=”70%”>
160             <table cellpadding=”0″ cellspacing=”0″ border=”0″>
161                 <tr>
162                     <td width=”200″ id=”passwdBar”>
163                         <table cellpadding=”0″ cellspacing=”0″ border=”0″>
164                             <tr>
165                                 <td nowrap valign=”top”  height=”15px”><font color=”#808080″ size=”-1″ face=”Arial, sans-serif”><div id=”passwdRating”></div></font></td>
166                             </tr>
167                             <tr>
168                                 <td height=”3px”></td>
169                             </tr>
170                             <tr>
171                                 <td colspan=”2″>
172                                     <table cellpadding=”0″ bgcolor=”#ffffff” cellspacing=”0″ border=”0″ width=”200″>
173                                         <tr>
174                                             <td width=”0%” id=”posBar” bgcolor=”#e0e0e0″ height=”4px”></td>
175                                             <td width=”100%” id=”negBar” bgcolor=”#e0e0e0″ height=”4px”></td>
176                                         </tr>
177                                     </table>
178                                 </td>
179                             </tr>
180                         </table>
181                     </td>
182                 </tr>
183             </table>
184         </td>
185     </tr>
186 </table>
187