How to get array values in ASP.NET hidden field and return back those value to code behind

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i am getting array values in asp.net hidden field in javascript but the last value is giving at the code behind can anybody tell me the solution for this issue

What I have tried:

let optionSelected = Array.from(document.getElementsByName('options' + i)).find(r => r.checked).value;
var hdnRadioButtonSelectedOption = document.getElementById("hdnRadioButtonSelectedValue");
hdnRadioButtonSelectedOption.value = optionSelected;
alert(hdnRadioButtonSelectedOption.value);

Posted 1-Jan-19 18:12pm

Member 8583441

Updated 1-Jan-19 20:36pm

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Ehsan Sajjad 2-Jan-19 0:23am

how does it looks in rendered html ?

Member 8583441 2-Jan-19 0:42am

string strSelected = hdnRadioButtonSelectedValue.Value;

Nitin S 2-Jan-19 1:34am

can you create a fiddle of what you have done?

Member 8583441 2-Jan-19 1:59am

https://jsfiddle.net/pkalyan/jpr9gq04/1/

Prifti Constantine 2-Jan-19 2:25am

I would recommend Serializing the array Data , Store it inside the hiddenControl.Value
and then Deserialize it when retreiving it in the code behind.

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Prifti Constantine · Accepted Answer · 2019-01-01T20:37:00

Solution 1

Quite generalized according to your given code but i hope this will help you out!

<pre lang="c#">string[] newArray = new string[2];
            string SerializedData = Newtonsoft.Json.JsonConvert.SerializeObject(newArray);
            //The serialized Array will have a Json format and it will be stored inside the hidden COntrol Value
            HiddenCOntrol.value = SerializedData;
            //you can get the Serialized Data from the hidden control Accordingly by desirializing it to your specified object:
            string[] DesirializedData = (string[])Newtonsoft.Json.JsonConvert.DeserializeObject(HiddenControl.Value);

Posted 1-Jan-19 20:37pm

Prifti Constantine

Comments

Member 8583441 2-Jan-19 3:15am

in this solution javascript is not presented

Prifti Constantine 2-Jan-19 3:50am

If the specified control exists then why would you need javascript? Could you please explain your way of thinking? you want to send it through ajax maybe? Create a __doPostback() maybe?

Member 8583441 2-Jan-19 4:04am

why i am giving in javascript because i am doing online exam in which exam page is designed in code behind. for that purpose i required the values of radio button which is checked that values are storing hidden fields using javascript. But those values are reflecting back to code behind when click the button. Only the last value is sending to code behind that i don't require. I required all the values from javascript to code behind when i click the finish button. how to achieve this

Prifti Constantine 2-Jan-19 4:13am

If the radioButton has the tag "runat='server'" then you can simple get the control value in the code behind by typping its id.
if you have a <asp:HiddenField runat="server" ID="HiddenControlName" /> or a radiobutton , Control Types do not matter, if the runat=server tag is included then you can use string hiddenValue = HiddenControlName.value.ToString();

Either that or some more code is needed for the solution of your problem.

Member 8583441 2-Jan-19 4:25am

yes sir but this radio buttons are taken from string builder which does not require runat=server because i have used HTML input type radio
A) {2}

Member 8583441 2-Jan-19 4:26am

<tr><td class='col-12'><input type='radio' id='rb1{0}' name='options{0}' value='A' /> A) <label for='rb1{0}' id='lblChoiceA{0}'>{2}</label></td></tr>

Prifti Constantine 2-Jan-19 5:04am

So what you are saying is that those radio buttons are created dynamically from code behind. You must probably iterate the Data Array in order to get each value out of it.. Build Another Array put the checked values inside and then Serialize the Array and put it inside the Hidden Control. When that is done you can get the serialized Array in the Code Behind , Deserialize it to your wanted object (Array of string in this situation) and then you can iterate the array in order to get the Values you want. Hope this helps...

Member 8583441 2-Jan-19 5:15am

super sir explanation but can you give the solution with this statement

Prifti Constantine 2-Jan-19 5:49am

If you already have the array and the values you want then you can use:
Serializing Data:
var Wantedfields = Array.serializeArray();
hidenControl.value = Wantedfields;

On the Code behind then you can deserialize the hidenCOntrol.Value through a javascript serializer.

Member 8583441 2-Jan-19 6:07am

now it works fine as expected thanks a lot sir for explaining and also giving me the correct way

Prifti Constantine 2-Jan-19 6:08am

No problem! If you could Mark as answered that would be awesome! Take care