Compatible with IE8 the following browser input form Properties placeholder cannot be smart, and problem handling with Jquery.validate.js forms validation plugin

Many of the current forms prompt using the Form property placeholder, this property is incompatible with IE8 the following browser, I wrote a compatible processing JS

//compatible with IE8 the following browser input does not function intelligently    if(Navigator.appname = = "Microsoft Internet Explorer" && (Navigator.appVersion.match (/7./i) = = "7." | | Navigator.appVersion.match (/8./i) = = "8." | | Navigator.appVersion.match (/6./i) = = "6." | | Navigator.appVersion.match (/5./i) = = "5.")){        $(' Input[type=text] '). each (function(Index, Val) {varInput = $ ( This); if(Input.attr (' placeholder ')! = "){                varDef_val = input.attr (' placeholder '))                varDef_color = input.css (' Color ')//default form original color                varTip_color = ' #999 '//color of the hint messageInput.css (' Color ', Tip_color) input.val (def_val) Input.on (' Focus ',function(event) {Input.css (' Color ', Def_color)if(Input.val () = =def_val) {Input.val (‘‘)                    }                }); Input.on (' Blur ',function(event) {if(Input.val () = = "| | input.val () = =def_val) {Input.css (' Color ', Tip_color) Input.val (Def_val)});    }        }); } 

The above code can achieve the effect of smart hints for browsers that are compatible with IE8, but the validation form is problematic, especially the JQ form verification plugin validate I use.

The reason is that IE8 the following default to input form value= ' Prompt information ', so that the value itself is not empty, with validate verification required (Required:true) will be invalidated.

My approach is to add a validation method within the Jquery.validate.js file required verify that its value cannot be equal to the placeholder value, as follows:

        //http://docs.jquery.com/Plugins/Validation/Methods/requiredRequiredfunction(value, element, param) {//Check if dependency is met            if( ! This. Depend (param, Element)) {                return"Dependency-mismatch"; }            if(element.nodeName.toLowerCase () = = = "Select" ) {                //could is an array for select-multiple or a string, both is fine this                varval =$ (Element). Val (); returnVal && val.length > 0; }            if( This. checkable (Element)) {                return  This. GetLength (value, Element) > 0; }            return($.trim (value). length > 0) && ($.trim (value)! = $ (Element). attr (' placeholder '));//add to verify that its value cannot be equal to placeholder value}

This will solve the problem IE8 the following form smart hints and form validation issues ~

Compatible IE8 The following browser input form properties placeholder do not function intelligently, and issue handling with Jquery.validate.js forms validation plug-ins