How to update additional dependent fields when dropdown selection changes
I have written several custom validation classes that permit comparing pairs of dates to see if they are valid, e.g. end date on or after start date. See mvc4 data annotation compare two dates. These work well when used within a single model. But I don’t know how to use them in a view model of parent and child entities to be used for creating and editing the child entities.
Let the parent entity be an Academic Calendar and the child entity be a Course. I am trying to create or edit a Course. In addition to requiring the Course start and end dates to be valid, I need to be able to check that the Course start date is on or after the Calendar start date and that the Course end date is on or before the Calendar end date. So I need to compare dates across two data models.
I created a view model that includes both the course data and calendar data, e.g. CourseId, CourseName, CourseStartDate, CourseEndDate plus CalendarId, CalendarName, CalendarStartDate, and CalendarEndDate. In the view, I can create a dropdown for Calendars with value and text fields corresponding to id and name, e.g. 1 and Fall 2018. My problem is that I need to be able to show the corresponding Calendar Start and End dates corresponding to the selected calendar. With Web Forms, I could add extra hidden columns to a dropdown, but I don’t know how to do that with MVC and Razor. I’d like the Calendar dates to be in read-only textboxes, so they can be checked by my comparison validation classes before attempting to insert a new ─ or update an existing ─ course. I need these Calendar date values to change when the selection changes in the dropdown.
razor model-view-controller dependencies dropdown selectionchanged
asked Nov 16 '18 at 1:16
Jeffrey RoughgardenJeffrey Roughgarden
349210
add a comment |
I have written several custom validation classes that permit comparing pairs of dates to see if they are valid, e.g. end date on or after start date. See mvc4 data annotation compare two dates. These work well when used within a single model. But I don’t know how to use them in a view model of parent and child entities to be used for creating and editing the child entities.
Let the parent entity be an Academic Calendar and the child entity be a Course. I am trying to create or edit a Course. In addition to requiring the Course start and end dates to be valid, I need to be able to check that the Course start date is on or after the Calendar start date and that the Course end date is on or before the Calendar end date. So I need to compare dates across two data models.
I created a view model that includes both the course data and calendar data, e.g. CourseId, CourseName, CourseStartDate, CourseEndDate plus CalendarId, CalendarName, CalendarStartDate, and CalendarEndDate. In the view, I can create a dropdown for Calendars with value and text fields corresponding to id and name, e.g. 1 and Fall 2018. My problem is that I need to be able to show the corresponding Calendar Start and End dates corresponding to the selected calendar. With Web Forms, I could add extra hidden columns to a dropdown, but I don’t know how to do that with MVC and Razor. I’d like the Calendar dates to be in read-only textboxes, so they can be checked by my comparison validation classes before attempting to insert a new ─ or update an existing ─ course. I need these Calendar date values to change when the selection changes in the dropdown.
razor model-view-controller dependencies dropdown selectionchanged
asked Nov 16 '18 at 1:16
Jeffrey RoughgardenJeffrey Roughgarden
349210
The context of aValidationAttributeis the class itself. It has no knowledge of its parent entity. Since you are using a view model then you can add theCalendarStartDateetc in theCourseViewModelso that you get client and server side validation using a customValidationAttribute. As far as changing the dates based on a selected option, you need to use javascript to handle client side events.
– user3559349
Nov 16 '18 at 8:32
As a side note, the Q/A you linked to does not give client side validation - for that you need to implementIClientValidatable- refer The Complete Guide To Validation In ASP.NET MVC 3 - Part 2
– user3559349
Nov 16 '18 at 8:34
add a comment |
I have written several custom validation classes that permit comparing pairs of dates to see if they are valid, e.g. end date on or after start date. See mvc4 data annotation compare two dates. These work well when used within a single model. But I don’t know how to use them in a view model of parent and child entities to be used for creating and editing the child entities.
Let the parent entity be an Academic Calendar and the child entity be a Course. I am trying to create or edit a Course. In addition to requiring the Course start and end dates to be valid, I need to be able to check that the Course start date is on or after the Calendar start date and that the Course end date is on or before the Calendar end date. So I need to compare dates across two data models.
I created a view model that includes both the course data and calendar data, e.g. CourseId, CourseName, CourseStartDate, CourseEndDate plus CalendarId, CalendarName, CalendarStartDate, and CalendarEndDate. In the view, I can create a dropdown for Calendars with value and text fields corresponding to id and name, e.g. 1 and Fall 2018. My problem is that I need to be able to show the corresponding Calendar Start and End dates corresponding to the selected calendar. With Web Forms, I could add extra hidden columns to a dropdown, but I don’t know how to do that with MVC and Razor. I’d like the Calendar dates to be in read-only textboxes, so they can be checked by my comparison validation classes before attempting to insert a new ─ or update an existing ─ course. I need these Calendar date values to change when the selection changes in the dropdown.
razor model-view-controller dependencies dropdown selectionchanged
asked Nov 16 '18 at 1:16
Jeffrey RoughgardenJeffrey Roughgarden
349210
I have written several custom validation classes that permit comparing pairs of dates to see if they are valid, e.g. end date on or after start date. See mvc4 data annotation compare two dates. These work well when used within a single model. But I don’t know how to use them in a view model of parent and child entities to be used for creating and editing the child entities.
Let the parent entity be an Academic Calendar and the child entity be a Course. I am trying to create or edit a Course. In addition to requiring the Course start and end dates to be valid, I need to be able to check that the Course start date is on or after the Calendar start date and that the Course end date is on or before the Calendar end date. So I need to compare dates across two data models.
I created a view model that includes both the course data and calendar data, e.g. CourseId, CourseName, CourseStartDate, CourseEndDate plus CalendarId, CalendarName, CalendarStartDate, and CalendarEndDate. In the view, I can create a dropdown for Calendars with value and text fields corresponding to id and name, e.g. 1 and Fall 2018. My problem is that I need to be able to show the corresponding Calendar Start and End dates corresponding to the selected calendar. With Web Forms, I could add extra hidden columns to a dropdown, but I don’t know how to do that with MVC and Razor. I’d like the Calendar dates to be in read-only textboxes, so they can be checked by my comparison validation classes before attempting to insert a new ─ or update an existing ─ course. I need these Calendar date values to change when the selection changes in the dropdown.
razor model-view-controller dependencies dropdown selectionchanged
razor model-view-controller dependencies dropdown selectionchanged
asked Nov 16 '18 at 1:16
Jeffrey RoughgardenJeffrey Roughgarden
349210
asked Nov 16 '18 at 1:16
Jeffrey RoughgardenJeffrey Roughgarden
349210
asked Nov 16 '18 at 1:16
Jeffrey RoughgardenJeffrey Roughgarden
349210
asked Nov 16 '18 at 1:16
Jeffrey RoughgardenJeffrey Roughgarden
349210
asked Nov 16 '18 at 1:16
Jeffrey RoughgardenJeffrey Roughgarden
349210
349210
The context of aValidationAttributeis the class itself. It has no knowledge of its parent entity. Since you are using a view model then you can add theCalendarStartDateetc in theCourseViewModelso that you get client and server side validation using a customValidationAttribute. As far as changing the dates based on a selected option, you need to use javascript to handle client side events.
– user3559349
Nov 16 '18 at 8:32
As a side note, the Q/A you linked to does not give client side validation - for that you need to implementIClientValidatable- refer The Complete Guide To Validation In ASP.NET MVC 3 - Part 2
– user3559349
Nov 16 '18 at 8:34
add a comment |
The context of aValidationAttributeis the class itself. It has no knowledge of its parent entity. Since you are using a view model then you can add theCalendarStartDateetc in theCourseViewModelso that you get client and server side validation using a customValidationAttribute. As far as changing the dates based on a selected option, you need to use javascript to handle client side events.
– user3559349
Nov 16 '18 at 8:32
As a side note, the Q/A you linked to does not give client side validation - for that you need to implementIClientValidatable- refer The Complete Guide To Validation In ASP.NET MVC 3 - Part 2
– user3559349
Nov 16 '18 at 8:34
The context of a
ValidationAttribute is the class itself. It has no knowledge of its parent entity. Since you are using a view model then you can add the CalendarStartDate etc in the CourseViewModel so that you get client and server side validation using a custom ValidationAttribute. As far as changing the dates based on a selected option, you need to use javascript to handle client side events.– user3559349
Nov 16 '18 at 8:32
The context of a
ValidationAttribute is the class itself. It has no knowledge of its parent entity. Since you are using a view model then you can add the CalendarStartDate etc in the CourseViewModel so that you get client and server side validation using a custom ValidationAttribute. As far as changing the dates based on a selected option, you need to use javascript to handle client side events.– user3559349
Nov 16 '18 at 8:32
As a side note, the Q/A you linked to does not give client side validation - for that you need to implement
IClientValidatable - refer The Complete Guide To Validation In ASP.NET MVC 3 - Part 2– user3559349
Nov 16 '18 at 8:34
As a side note, the Q/A you linked to does not give client side validation - for that you need to implement
IClientValidatable - refer The Complete Guide To Validation In ASP.NET MVC 3 - Part 2– user3559349
Nov 16 '18 at 8:34
add a comment |
0
active
oldest
votes
Your Answer
StackExchange.ifUsing("editor", function ()
StackExchange.using("externalEditor", function ()
StackExchange.using("snippets", function ()
StackExchange.snippets.init();
);
);
, "code-snippets");
StackExchange.ready(function()
var channelOptions =
tags: "".split(" "),
id: "1"
;
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function()
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled)
StackExchange.using("snippets", function()
createEditor();
);
else
createEditor();
);
function createEditor()
StackExchange.prepareEditor(
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader:
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
,
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
);
);
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53330108%2fhow-to-update-additional-dependent-fields-when-dropdown-selection-changes%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
0
active
oldest
votes
0
active
oldest
votes
active
oldest
votes
active
oldest
votes
Thanks for contributing an answer to Stack Overflow!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53330108%2fhow-to-update-additional-dependent-fields-when-dropdown-selection-changes%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
The context of a
ValidationAttributeis the class itself. It has no knowledge of its parent entity. Since you are using a view model then you can add theCalendarStartDateetc in theCourseViewModelso that you get client and server side validation using a customValidationAttribute. As far as changing the dates based on a selected option, you need to use javascript to handle client side events.– user3559349
Nov 16 '18 at 8:32
As a side note, the Q/A you linked to does not give client side validation - for that you need to implement
IClientValidatable- refer The Complete Guide To Validation In ASP.NET MVC 3 - Part 2– user3559349
Nov 16 '18 at 8:34