js中判断用户输入的值是否为空的简单实例(2)

/***********************************************************
*
*    公共js函数
*
***********************************************************/
function commonFunction()
{
    // check value is null or empty
    this.checkIsEmpty    = function(obj)
    {
        var flag    = true;
        for(var i=0; i<obj.length; i++)
        {
            var e    = obj.item(i);
            if(e.isRequired)
            {   
                if(e.value=='')
                {
                    alert(e.errorSForEmpty);
                    e.focus();
                    flag    = false;
                    break;
                }
            }

            if(e.isValidate)
            {
                if(this.checkValidate(e)==false)
                {
                    alert(e.errorSForValidate);
                    e.select();
                    e.focus();
                    flag    = false;
                    break;
                }
            }
        }

        return flag;
    }

    // check value is validate
    this.checkValidate    = function(e)
    {
        var v    = e.value;
        if(v!='')
        {
            return this.checkReg(e.validatePattern, v);
        }
    }

    // regexp validate
    this.checkReg    = function(pattern, value)
    {
        pattern    = pattern.substring(1, pattern.length-1);
        var reg    = new RegExp(pattern);
        if(!reg.test(value))
        {
            return false;
        }
    }

    // return an Element By id object for what id.
    this.$getElementById    = function(id)
    {
        var e    = document.getElementById(id);

        if(e!='undefined')
        {
            return e;
        }

        return;
    }

    // return an Element By name object for what id.
    this.$getElementsByName    = function(id)
    {
        var e    = document.getElementsByName(id);

        if(e!='undefined')
        {
            return e;
        }

        return;
    }
}

贴一张效果图片:

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