Answered How can I add jQuery to MODx?

<script src="assets/validate_form.js"></script>

alert ('In validate_form');

function isEmail(emailAddress) {
    var pattern = new RegExp(/^(("[\w-\s]+")|([\w-]+(?:\.[\w-]+)*)|("[\w-\s]+")([\w-]+(?:\.[\w-]+)*))(@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$)|(@\[?((25[0-5]\.|2[0-4][0-9]\.|1[0-9]{2}\.|[0-9]{1,2}\.))((25[0-5]|2[0-4][0-9]|1[0-9]{2}|[0-9]{1,2})\.){2}(25[0-5]|2[0-4][0-9]|1[0-9]{2}|[0-9]{1,2})\]?$)/i);
    return pattern.test(emailAddress);
};
 
$(document).ready(function(){ 
alert('111'); 
    $("form#contactForm").submit(function() {
        //When the form is submitted
 alert('222');         
        var email = $("input#email");
        var elem = $("form#contactForm").children('fieldset').children('input, textarea');
        var error,foc;
 
        //If email is filled in and the function isEmail returns true
        if(email && !isEmail(email.val())){
            email.focus();
            email.prev("label").html("<span>Please Enter A Valid Email Address</span>");
            error = true;
        }else{
            email.prev("label").html("Your Email*");
        }
 
        //Loop through each input and textarea
        elem.each(function(index){

            //Does this have the class "required"?
            if($(this).hasClass('required')==true){
 
                //It has the class, is it empty or still have the default value?
                if(!this.value || this.value == this.defaultValue ) {
                 
                    //Add the error class for CSS styling
                    $(this).addClass("error");
 
                    //Switch the error var to true
                    error = true; 
 
                    //If this is the first required element not filled out, save the ID
                    if(!foc)foc = $(this).attr("id");
                }else{
                     
                    //If this is filled out make sure it doesn't have the error class
                    $(this).removeClass("error");
                }
            }
        });
 
        //If error has been switched to true
        if (error){    
 
            //Focus on the first required element that hasn't been filled out.
            if(foc)$('#'+foc).css("color","#000").css("fontStyle","normal").focus();
 
            //Stop the form from submitting
            return false;
    }else{
            //Clear default values on non required elements before submit continues
            if(elem.value == this.defaultValue)
            this.value = "";
        }
    }); 
 alert('333');
    //Remove Default Text On Focus
    $("input, textarea").focus(function() { 
        if( this.value == this.defaultValue ) { 
            this.value = ""; 
            $(this).css("color","#000").css("fontStyle","normal"); 
        } 
    }).blur(function() { 
        if( !this.value.length ) {               
            $(this).css("color","#999").css("fontStyle","italic"); 
            this.value = this.defaultValue; 
        } 
    });
 
});