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MVC Basic Site: Step 2 - Exceptions Management

, 25 Oct 2013 Ms-PL 67.8K 4.6K 130
This second article from the "MVC Basic Site" series presents in details the exceptions management rules and their implementation for an ASP.NET MVC web site, and provides some utile base classes and source code for Logging and Exceptions Management that can be reused.
MvcBasicSiteDatabase.zip
MvcBasicSiteDatabase.bak
MvcBasicSiteSourceCode.zip
MvcBasicSiteSourceCode
MvcBasicSite
CreateEventLogEntry
Properties
MvcBasic.Logic
ClassDiagram1.cd
MvcBasicSiteModel.edmx
Properties
MvcBasicSite
app_code
App_GlobalResources
ClassDiagramUI.cd
Content
Images
dd_arrow.gif
flag_De.png
flag_En.png
flag_Ro.png
HeaderLogo.png
icon-arrow.gif
themes
base
images
ui-bg_flat_0_aaaaaa_40x100.png
ui-bg_flat_75_ffffff_40x100.png
ui-bg_glass_55_fbf9ee_1x400.png
ui-bg_glass_65_ffffff_1x400.png
ui-bg_glass_75_dadada_1x400.png
ui-bg_glass_75_e6e6e6_1x400.png
ui-bg_glass_95_fef1ec_1x400.png
ui-bg_highlight-soft_75_cccccc_1x100.png
ui-icons_222222_256x240.png
ui-icons_2e83ff_256x240.png
ui-icons_454545_256x240.png
ui-icons_888888_256x240.png
ui-icons_cd0a0a_256x240.png
Controllers
Global.asax
Models
MvcBasicSite.csproj.user
Properties
Scripts
Views
Account
Home
Shared
MvcBasicSiteSourceCodeMVC4.zip
ClassDiagram1.cd
MvcBasicSiteModel.edmx
App_Data
ClassDiagramUI.cd
dd_arrow.gif
flag_De.png
flag_En.png
flag_Ro.png
HeaderLogo.png
icon-arrow.gif
animated-overlay.gif
ui-bg_flat_0_aaaaaa_40x100.png
ui-bg_flat_75_ffffff_40x100.png
ui-bg_glass_55_fbf9ee_1x400.png
ui-bg_glass_65_ffffff_1x400.png
ui-bg_glass_75_dadada_1x400.png
ui-bg_glass_75_e6e6e6_1x400.png
ui-bg_glass_95_fef1ec_1x400.png
ui-bg_highlight-soft_75_cccccc_1x100.png
ui-icons_222222_256x240.png
ui-icons_2e83ff_256x240.png
ui-icons_454545_256x240.png
ui-icons_888888_256x240.png
ui-icons_cd0a0a_256x240.png
minified
images
animated-overlay.gif
ui-bg_flat_0_aaaaaa_40x100.png
ui-bg_flat_75_ffffff_40x100.png
ui-bg_glass_55_fbf9ee_1x400.png
ui-bg_glass_65_ffffff_1x400.png
ui-bg_glass_75_dadada_1x400.png
ui-bg_glass_75_e6e6e6_1x400.png
ui-bg_glass_95_fef1ec_1x400.png
ui-bg_highlight-soft_75_cccccc_1x100.png
ui-icons_222222_256x240.png
ui-icons_2e83ff_256x240.png
ui-icons_454545_256x240.png
ui-icons_888888_256x240.png
ui-icons_cd0a0a_256x240.png
Global.asax
MvcBasicSite.csproj.user
/// <reference path="jquery-1.5.1.js" />
/// <reference path="jquery.validate.js" />

/*!
** Unobtrusive validation support library for jQuery and jQuery Validate
** Copyright (C) Microsoft Corporation. All rights reserved.
*/

/*jslint white: true, browser: true, onevar: true, undef: true, nomen: true, eqeqeq: true, plusplus: true, bitwise: true, regexp: true, newcap: true, immed: true, strict: false */
/*global document: false, jQuery: false */

(function ($) {
    var $jQval = $.validator,
        adapters,
        data_validation = "unobtrusiveValidation";

    function setValidationValues(options, ruleName, value) {
        options.rules[ruleName] = value;
        if (options.message) {
            options.messages[ruleName] = options.message;
        }
    }

    function splitAndTrim(value) {
        return value.replace(/^\s+|\s+$/g, "").split(/\s*,\s*/g);
    }

    function getModelPrefix(fieldName) {
        return fieldName.substr(0, fieldName.lastIndexOf(".") + 1);
    }

    function appendModelPrefix(value, prefix) {
        if (value.indexOf("*.") === 0) {
            value = value.replace("*.", prefix);
        }
        return value;
    }

    function onError(error, inputElement) {  // 'this' is the form element
        var container = $(this).find("[data-valmsg-for='" + inputElement[0].name + "']"),
            replace = $.parseJSON(container.attr("data-valmsg-replace")) !== false;

        container.removeClass("field-validation-valid").addClass("field-validation-error");
        error.data("unobtrusiveContainer", container);

        if (replace) {
            container.empty();
            error.removeClass("input-validation-error").appendTo(container);
        }
        else {
            error.hide();
        }
    }

    function onErrors(form, validator) {  // 'this' is the form element
        var container = $(this).find("[data-valmsg-summary=true]"),
            list = container.find("ul");

        if (list && list.length && validator.errorList.length) {
            list.empty();
            container.addClass("validation-summary-errors").removeClass("validation-summary-valid");

            $.each(validator.errorList, function () {
                $("<li />").html(this.message).appendTo(list);
            });
        }
    }

    function onSuccess(error) {  // 'this' is the form element
        var container = error.data("unobtrusiveContainer"),
            replace = $.parseJSON(container.attr("data-valmsg-replace"));

        if (container) {
            container.addClass("field-validation-valid").removeClass("field-validation-error");
            error.removeData("unobtrusiveContainer");

            if (replace) {
                container.empty();
            }
        }
    }

    function validationInfo(form) {
        var $form = $(form),
            result = $form.data(data_validation);

        if (!result) {
            result = {
                options: {  // options structure passed to jQuery Validate's validate() method
                    errorClass: "input-validation-error",
                    errorElement: "span",
                    errorPlacement: $.proxy(onError, form),
                    invalidHandler: $.proxy(onErrors, form),
                    messages: {},
                    rules: {},
                    success: $.proxy(onSuccess, form)
                },
                attachValidation: function () {
                    $form.validate(this.options);
                },
                validate: function () {  // a validation function that is called by unobtrusive Ajax
                    $form.validate();
                    return $form.valid();
                }
            };
            $form.data(data_validation, result);
        }

        return result;
    }

    $jQval.unobtrusive = {
        adapters: [],

        parseElement: function (element, skipAttach) {
            /// <summary>
            /// Parses a single HTML element for unobtrusive validation attributes.
            /// </summary>
            /// <param name="element" domElement="true">The HTML element to be parsed.</param>
            /// <param name="skipAttach" type="Boolean">[Optional] true to skip attaching the
            /// validation to the form. If parsing just this single element, you should specify true.
            /// If parsing several elements, you should specify false, and manually attach the validation
            /// to the form when you are finished. The default is false.</param>
            var $element = $(element),
                form = $element.parents("form")[0],
                valInfo, rules, messages;

            if (!form) {  // Cannot do client-side validation without a form
                return;
            }

            valInfo = validationInfo(form);
            valInfo.options.rules[element.name] = rules = {};
            valInfo.options.messages[element.name] = messages = {};

            $.each(this.adapters, function () {
                var prefix = "data-val-" + this.name,
                    message = $element.attr(prefix),
                    paramValues = {};

                if (message !== undefined) {  // Compare against undefined, because an empty message is legal (and falsy)
                    prefix += "-";

                    $.each(this.params, function () {
                        paramValues[this] = $element.attr(prefix + this);
                    });

                    this.adapt({
                        element: element,
                        form: form,
                        message: message,
                        params: paramValues,
                        rules: rules,
                        messages: messages
                    });
                }
            });

            jQuery.extend(rules, { "__dummy__": true });

            if (!skipAttach) {
                valInfo.attachValidation();
            }
        },

        parse: function (selector) {
            /// <summary>
            /// Parses all the HTML elements in the specified selector. It looks for input elements decorated
            /// with the [data-val=true] attribute value and enables validation according to the data-val-*
            /// attribute values.
            /// </summary>
            /// <param name="selector" type="String">Any valid jQuery selector.</param>
            $(selector).find(":input[data-val=true]").each(function () {
                $jQval.unobtrusive.parseElement(this, true);
            });

            $("form").each(function () {
                var info = validationInfo(this);
                if (info) {
                    info.attachValidation();
                }
            });
        }
    };

    adapters = $jQval.unobtrusive.adapters;

    adapters.add = function (adapterName, params, fn) {
        /// <summary>Adds a new adapter to convert unobtrusive HTML into a jQuery Validate validation.</summary>
        /// <param name="adapterName" type="String">The name of the adapter to be added. This matches the name used
        /// in the data-val-nnnn HTML attribute (where nnnn is the adapter name).</param>
        /// <param name="params" type="Array" optional="true">[Optional] An array of parameter names (strings) that will
        /// be extracted from the data-val-nnnn-mmmm HTML attributes (where nnnn is the adapter name, and
        /// mmmm is the parameter name).</param>
        /// <param name="fn" type="Function">The function to call, which adapts the values from the HTML
        /// attributes into jQuery Validate rules and/or messages.</param>
        /// <returns type="jQuery.validator.unobtrusive.adapters" />
        if (!fn) {  // Called with no params, just a function
            fn = params;
            params = [];
        }
        this.push({ name: adapterName, params: params, adapt: fn });
        return this;
    };

    adapters.addBool = function (adapterName, ruleName) {
        /// <summary>Adds a new adapter to convert unobtrusive HTML into a jQuery Validate validation, where
        /// the jQuery Validate validation rule has no parameter values.</summary>
        /// <param name="adapterName" type="String">The name of the adapter to be added. This matches the name used
        /// in the data-val-nnnn HTML attribute (where nnnn is the adapter name).</param>
        /// <param name="ruleName" type="String" optional="true">[Optional] The name of the jQuery Validate rule. If not provided, the value
        /// of adapterName will be used instead.</param>
        /// <returns type="jQuery.validator.unobtrusive.adapters" />
        return this.add(adapterName, function (options) {
            setValidationValues(options, ruleName || adapterName, true);
        });
    };

    adapters.addMinMax = function (adapterName, minRuleName, maxRuleName, minMaxRuleName, minAttribute, maxAttribute) {
        /// <summary>Adds a new adapter to convert unobtrusive HTML into a jQuery Validate validation, where
        /// the jQuery Validate validation has three potential rules (one for min-only, one for max-only, and
        /// one for min-and-max). The HTML parameters are expected to be named -min and -max.</summary>
        /// <param name="adapterName" type="String">The name of the adapter to be added. This matches the name used
        /// in the data-val-nnnn HTML attribute (where nnnn is the adapter name).</param>
        /// <param name="minRuleName" type="String">The name of the jQuery Validate rule to be used when you only
        /// have a minimum value.</param>
        /// <param name="maxRuleName" type="String">The name of the jQuery Validate rule to be used when you only
        /// have a maximum value.</param>
        /// <param name="minMaxRuleName" type="String">The name of the jQuery Validate rule to be used when you
        /// have both a minimum and maximum value.</param>
        /// <param name="minAttribute" type="String" optional="true">[Optional] The name of the HTML attribute that
        /// contains the minimum value. The default is "min".</param>
        /// <param name="maxAttribute" type="String" optional="true">[Optional] The name of the HTML attribute that
        /// contains the maximum value. The default is "max".</param>
        /// <returns type="jQuery.validator.unobtrusive.adapters" />
        return this.add(adapterName, [minAttribute || "min", maxAttribute || "max"], function (options) {
            var min = options.params.min,
                max = options.params.max;

            if (min && max) {
                setValidationValues(options, minMaxRuleName, [min, max]);
            }
            else if (min) {
                setValidationValues(options, minRuleName, min);
            }
            else if (max) {
                setValidationValues(options, maxRuleName, max);
            }
        });
    };

    adapters.addSingleVal = function (adapterName, attribute, ruleName) {
        /// <summary>Adds a new adapter to convert unobtrusive HTML into a jQuery Validate validation, where
        /// the jQuery Validate validation rule has a single value.</summary>
        /// <param name="adapterName" type="String">The name of the adapter to be added. This matches the name used
        /// in the data-val-nnnn HTML attribute(where nnnn is the adapter name).</param>
        /// <param name="attribute" type="String">[Optional] The name of the HTML attribute that contains the value.
        /// The default is "val".</param>
        /// <param name="ruleName" type="String" optional="true">[Optional] The name of the jQuery Validate rule. If not provided, the value
        /// of adapterName will be used instead.</param>
        /// <returns type="jQuery.validator.unobtrusive.adapters" />
        return this.add(adapterName, [attribute || "val"], function (options) {
            setValidationValues(options, ruleName || adapterName, options.params[attribute]);
        });
    };

    $jQval.addMethod("__dummy__", function (value, element, params) {
        return true;
    });

    $jQval.addMethod("regex", function (value, element, params) {
        var match;
        if (this.optional(element)) {
            return true;
        }

        match = new RegExp(params).exec(value);
        return (match && (match.index === 0) && (match[0].length === value.length));
    });

    adapters.addSingleVal("accept", "exts").addSingleVal("regex", "pattern");
    adapters.addBool("creditcard").addBool("date").addBool("digits").addBool("email").addBool("number").addBool("url");
    adapters.addMinMax("length", "minlength", "maxlength", "rangelength").addMinMax("range", "min", "max", "range");
    adapters.add("equalto", ["other"], function (options) {
        var prefix = getModelPrefix(options.element.name),
            other = options.params.other,
            fullOtherName = appendModelPrefix(other, prefix),
            element = $(options.form).find(":input[name=" + fullOtherName + "]")[0];

        setValidationValues(options, "equalTo", element);
    });
    adapters.add("required", function (options) {
        // jQuery Validate equates "required" with "mandatory" for checkbox elements
        if (options.element.tagName.toUpperCase() !== "INPUT" || options.element.type.toUpperCase() !== "CHECKBOX") {
            setValidationValues(options, "required", true);
        }
    });
    adapters.add("remote", ["url", "type", "additionalfields"], function (options) {
        var value = {
            url: options.params.url,
            type: options.params.type || "GET",
            data: {}
        },
            prefix = getModelPrefix(options.element.name);

        $.each(splitAndTrim(options.params.additionalfields || options.element.name), function (i, fieldName) {
            var paramName = appendModelPrefix(fieldName, prefix);
            value.data[paramName] = function () {
                return $(options.form).find(":input[name='" + paramName + "']").val();
            };
        });

        setValidationValues(options, "remote", value);
    });

    $(function () {
        $jQval.unobtrusive.parse(document);
    });
}(jQuery));

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This article, along with any associated source code and files, is licensed under The Microsoft Public License (Ms-PL)

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About the Author

Raul Iloc
Program Manager SOFTVISION
Romania Romania
I am Project Manager with about 19 years working experience in software development and about 14 years as Project Manager and Architect.

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