obtain the selected value from the radio button

While working on the server side, I dynamically created radio buttons with the following code:

RadioButton button1 = new RadioButton();
button1.ID = question.Name + "_Radio1";
button1.Text = "Yes";

RadioButton button2 = new RadioButton();
button2.ID = question.Name + "_Radio2";
button2.Text = "No";
 if (question.IsDynamic)
 {
     button1.Attributes.Add("onclick", "return updateQuestions('" + button1.ID + "')");
  }

After this, when trying to retrieve the value of the radio button using JavaScript, the userAnswer variable was empty. How can I successfully obtain the value of the radio button?

function updateQuestions(controlName) {


        var userAnswer;

        if (controlType == "RadioButton") {

            userAnswer = document.getElementById(controlName).innerHTML;
        }

Answer №1

Retrieve the value:

userAnswer = document.getElementById(controlName).value;

Additionally, it is advisable to pass something other than an id into the function. If the value is what you require, simply pass the value. Any of these methods will effectively send the value directly to the function:

button1.Attributes.Add("onclick", "return updateQuestions('someValue')");

or

button1.Attributes.Add("onclick", "return updateQuestions(this.value)");

Update: Furthermore, if you haven't explicitly defined the value on the control server side, the value will be an empty string, so your observation is accurate. Specify the value when creating the control by using button1.Value = "myValue";.

RadioButton button1 = new RadioButton();
button1.ID = question.Name + "_Radio1";
button1.Text = "Yes";
button1.Attributes["value"] = "Yes";

Answer №2

Give this a shot:

inputValue = document.getElementById(elementId).value;

Answer №3

Modify the following code snippet:

button1.Attributes.Add("onclick", "return updateQuestions('" + button1.ID + "')");
to

button1.Attributes.Add("onclick", "return updateQuestions('" + button1.ClientID+ "')");

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