/// <summary>
/// Handles events that occur when an edit operation is requested, but before the Update Answers ListView item is put in edit mode.
/// </summary>
/// <param name="sender">Contains a reference to the control/object that raised the event.</param>
/// <param name="e">Provides data for the ItemEditing event, which occurs when an edit operation is requested but before the ListView item is put in edit mode.</param>
protected void UpdateAnswersListView_ItemEditing(object sender, ListViewEditEventArgs e)
{
//hide message user control
MessageUserControl.Visible = false;
//hide datapager
DataPager pager = UpdateAnswersListView.FindControl("ActiveDataPager") as DataPager;
pager.Visible = false;
}
/// <summary>
/// Populates and updates the subquestions list view based on the selected question
/// </summary>
/// <param name="sender">Contains a reference to the control/object that raised the event.</param>
/// <param name="e">Represents the base class for classes that contain event data, and provides a value to use for events that do not include event data.</param>
protected void FetchAnswersButton_Click(object sender, EventArgs e)
{
//if user selects the "Select a question..." option in the dropdown list, do the following actions:
if (QuestionsWithAnswersDropDownList.SelectedValue == "0")
{
//show error message
MessageUserControl.Visible = true;
MessageUserControl.ShowInfoError("No Question Selected", "Please select a question.");
//highlight the dropdown list and refresh the answers listview
QuestionsWithAnswersDropDownList.Focus();
UpdateAnswersListView.DataBind();
}
else
{
//show informational message
MessageUserControl.ShowInfo("Answers Displayed", "Answers associated under the selected question are now displayed.");
UpdateAnswersListView.DataBind();
}
}
/// <summary>
/// Handles the actions executed by command buttons found in the Answers list view
/// </summary>
/// <param name="sender">Contains a reference to the control/object that raised the event.</param>
/// <param name="e">Provides data for the ItemCommand event, which occurs when a button in a ListView is clicked.</param>
protected void UpdateAnswersListView_ItemCommand(object sender, ListViewCommandEventArgs e)
{
//If the Edit button is clicked, do the following actions:
if (e.CommandName.Equals("Edit"))
{
//show informational message
MessageUserControl.Visible = true;
MessageUserControl.ShowInfo("Edit Mode Active", "The answer text in the selected row can now be edited.");
//disable drop-down list and fetch button to prevent editing of answers to other questions
QuestionsWithAnswersDropDownList.Enabled = false;
FetchAnswersButton.Enabled = false;
}
//If the Change button is clicked, do the following actions:
else if (e.CommandName.Equals("Change"))
{
//capture the answer Id of the selected row
int answerId = int.Parse(e.CommandArgument.ToString());
//capture the row index of the selected row
int i = e.Item.DisplayIndex;
//find the answer textbox in the selected row
TextBox answerTextBox = UpdateAnswersListView.Items[i].FindControl("descriptionTextBox") as TextBox;
//capture the answer text from the textbox
string answerText = answerTextBox.Text;
//handle null values and white-space-only values
if (string.IsNullOrEmpty(answerText) || string.IsNullOrWhiteSpace(answerText))
{
//show error message
MessageUserControl.Visible = true;
MessageUserControl.ShowInfoError("Processing Error", "Answer is required.");
//highlight the answer textbox in the row that caused the error
answerTextBox.Focus();
}
//if user-entered value is not null or just a white space, do the the following actions:
else
{
MessageUserControl.TryRun(() =>
{
//check if user entered invalid values
Utility utility = new Utility();
utility.checkValidString(answerText);
//update the answer text of the selected row
AnswerController sysmgr = new AnswerController();
sysmgr.Answer_Update(answerText, answerId);
UpdateAnswersListView.DataBind();
UpdateAnswersListView.EditIndex = -1;
}, "Success", "Answer has been updated.");
}
//show success/error message
MessageUserControl.Visible = true;
//show datapager
DataPager pager = UpdateAnswersListView.FindControl("ActiveDataPager") as DataPager;
pager.Visible = true;
//enable drop-down list and fetch button to allow editing of other answers to other questions
QuestionsWithAnswersDropDownList.Enabled = true;
FetchAnswersButton.Enabled = true;
}
//If the Cancel button is clicked, do the following actions:
else if (e.CommandName.Equals("Cancel"))
{
//show informational message
MessageUserControl.Visible = true;
MessageUserControl.ShowInfo("Update canceled", "No changes to the selected answer were saved.");
//show datapager
DataPager pager = UpdateAnswersListView.FindControl("ActiveDataPager") as DataPager;
pager.Visible = true;
//enable drop-down list and fetch button to allow editing of other answers to other questions
QuestionsWithAnswersDropDownList.Enabled = true;
FetchAnswersButton.Enabled = true;
}
}