文本字段验证使用Jquery

$(document).ready(function(){
    //assuming the validation fires on the click of a button
    $("#btnSubmit").click(function(){ 
        //set valid variable to true
        var blnIsValid = true;
        //loop through each of the text Boxes
        $(":text[class^='number']").each(function(i){
            //start validaTing from the second text Box
            if(i > 0) {
                var curTxtBox = $(this);
                var prevTxtBox =  $(":text[class^='number']:eq("+ (i-1) +")");
                if($.trim(curTxtBox.val()) != "" && $.trim(prevTxtBox.val()) == "") {
                    alert("Enter value for prevIoUs distance");
                    //set focus on the text Box
                    prevTxtBox.focus();
                    //set valid variable to false
                    blnIsValid = false;
                    //exit the loop
                    return false;
                }
            }
        });
        return blnIsValid;
    });
});

这是jsFiddle的一个例子