ASP.Net MVC Postback does not clear textbox

1
votes

On a .cshtml page I have a single textbox inside a form. When I enter some text and press return it triggers a POST to a controller of the same name (different signature). The code processes the text and a model is created and passed back to the same page where in addition to the original textbox a grid is now populated (conditionally). Everything works, except the text in the textbox is retained.

This is a little odd, considering that most of the questions on here are about retaining the text after a POST and the indication has been that the text should not automatically be retained.

I can probably assign the textbox an empty string but I am simply wondering if I have this wrong?

2
asp.net-mvctextboxpostback
I believe you passed the model object with return view(<model object>). Remove that from here. - Kundan Singh Chouhan
This may be restatement of what @KundanSinghChouhan said, but did you create a new model to your View? Or did you pass back the same model that was sent to your post method? - Dave Alperovich
Hi In your question, you have mentioned ‘The code processes the text and a model is created and passed back to the same page..’ Assuming your view is strongly typed and the textbox is rendered off a property of the model, you should be able to use a breakpoint just before you return the model for the second time and check the value of the property. I also have a strong suspicion just as @Kundan Singh Chouhan mentioned that you may be using the model which was return to you by the first post. - Chintana Meegamarachchi
Thank you for all responses. - user646306
The textbox is the only object in the posted form. The text entered is compared to existing data and the outcome is to either create a model that includes the entry and related data or to simply return a string indicating the result. So if the entry dosen't match any existing entry, then no model is ceated and just the string is returned. I found I was unable to change the form data in code and so have chosen to use jQuery to empty the textbox when the page is created. - user646306

2 Answers

0
votes

Even if it was a simple textbox, html textbox is a input control that has two very important properties, i.e.

  1. name
  2. value

browser will send this name value pair to server and the default behavior of server is to return the collection of all pairs back to browser when its done whatever it was supposed to do.

this collection is called post data. (or sometimes form data)

0
votes

Yes, you could clear the textbox in code if everything was fine on postback

If something was wrong (exception or validation) you could do nothing ( as you do now) and text will be there again, what's makes sense in the UI .