Limit string length

In the development of Web pages, the string in the form too long and beyond the specified length will cause some unnecessary trouble, such as: User registration system restrictions on the user name only 8 English characters, but the user entered 10 or more character, it may cause the nickname page display the wrong line, or the nickname is truncated problem. Here's a solution to limit the length of a string: 1, by using JavaScript native method of getting properties:

#id. getattribute ("Data-length");

To determine the limit length of the input box.

2, compare the length of the input with the limit length property of the input box:

if (Input length > attribute length) {  // over length auto intercept   }

HTML code:

<input type= "Text" data-length= "6" id= "Limitlength" name= "Iname"/>

JavaScript method:

 var  maxLength = function   (tthis) { var  _v = tThis.value.replace (Maxregex, '), //  get input text (remove spaces)  _vlen = _v.length, Datalength  = Tthis.getattribute (' data-length '),  Get the limit length  Datamodel = Tthis.getattribute (' Data-model ' ), Sublen  = Datalength;  if  (_vlen > Datalength) {Tthis.value  /span>= _v.substr (0,sublen); //  judging length, exceeding length automatically intercept   

Complete JavaScript code:

varLimitlength = document.getElementById (' limitlength ')); varMaxregex =/\s+/g;//regular expression for removing spaces            varMaxLength =function(tthis) {var_v = TThis.value.replace (Maxregex, "),//get input text (remove spaces)_vlen =_v.length, Datalength= Tthis.getattribute (' data-length '),//Get limit lengthDatamodel = Tthis.getattribute (' Data-model ')), Sublen=datalength; if(_vlen >datalength) {Tthis.value= _v.substr (0,sublen);//judging length, exceeding the length of the automatic intercept}} Limitlength.onblur=function() {maxLength ( This); } limitlength.onkeyup=function() {maxLength ( This); } Limitlength.onfocus=function() {maxLength ( This); }

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Limit string length