php - How can make html values safe from change -


how can make html values safe change browsers

some examples

textarea 

<textarea maxlength="50"></textarea>

any 1 can change maxlength value

and <a href="#" rel="15" >like</a> 1 can change rel value , rel value id of post

i use event.preventdefault(); on jquery

but need change value jquery help

thanks

basically way @ validation this:

  • client side validation - can used provide "instant" feedback user. way users have difficulty typing in many characters or invalid values. gives them feedback before move off data entry field can fix errors. others have said never substitute server validation

  • server side validation - actual validation. assume coming client suspect. need check "html" characters (if aren't escaping output later on pages). need check length of data. , of course need check other business rules might have. repeat: assume input suspect!

for familiar client/server programming may seem common sense, important keep in mind. hope helps some!


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