asp.net mvc - How to change a model property from a javascript function inside a view? - Stack Overflow

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Is there any way to alter my Model properties from a javascript function inside a view?

Specifically, I have an edit view and need to access a string property value with

function SomeJSFunction() {
var somevar = '<%=Model.Property %>';
...

then do some changes on somevar and set the model property to the changed string. I'm doing a submit at this point, so it's not a question of dealing with the display, just need to alter the model from inside the function before I submit. I know I could pass the string as a parameter and deal with it inside the controller but it just doesn't cut it as I really need to be done with it in the view. Appreciate any help!

Is there any way to alter my Model properties from a javascript function inside a view?

Specifically, I have an edit view and need to access a string property value with

function SomeJSFunction() {
var somevar = '<%=Model.Property %>';
...

then do some changes on somevar and set the model property to the changed string. I'm doing a submit at this point, so it's not a question of dealing with the display, just need to alter the model from inside the function before I submit. I know I could pass the string as a parameter and deal with it inside the controller but it just doesn't cut it as I really need to be done with it in the view. Appreciate any help!

• javascript
• asp-mvc
• model

Share Improve this question Follow asked Oct 12, 2010 at 8:59 pklosinskipklosinski 22933 silver badges99 bronze badges 2

• i don't think you can change what is already in the ViewModel - i believe this is read-only. Why don't you set a hidden field in the form (from javascript), then you can look at that in the Request.Form collection when you submit? – RPM1984 Commented Oct 12, 2010 at 9:04
• yes, it is read-only. think of the model as being a 'served' response. once it's written to the page, the response is over. it's not like the bound controls in webfroms that talk to the page life-cycle. you'll have to 'post' the changes back via either a form or via jquery ajax etc.. this is basically how mvc works, so there's plenty of stuff out there to reference. – jim tollan Commented Oct 12, 2010 at 9:11

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1 Answer 1

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You can't do this using javascript. The model is instantiated by the controller and passed to the view. If you want to modify some properties you will need to perform a request to a controller action and send the new values. This could be done either using a standard form or AJAX request.

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