protected void Page_Load(object sender, EventArgs e)
{
if (!this.IsPostBack)
{
try
{
//Initialising Neo4j connection
GraphDBReader.InitNeo4JConnection("DB_URL", "Username", "Password");
//Retrieving graph nodes
string nodes = GraphDBReader.RetrieveNodes();
//Retrieving graph links
string links = GraphDBReader.RetrieveRelationships();
//txtJson will contain the full JSON string to be read the VivaGraph JS library
txtJson.Value = "{" + "\"nodes\":[" + nodes + "]," + "\"links\":[" + links + "]" + "}";
//Displaying graph summary
lblNodesCount.Text = GraphDBReader.GetNodesCount().ToString();
lblLinksCount.Text = GraphDBReader.GetLinksCount().ToString();
//Filling the dropdown used for search and filtering purposes
FillDropdown();
}
catch
{
//In case that the connection to the Neo4j database fails
ScriptManager.RegisterStartupScript(this, typeof(Page), "UpdateMsg", "alert('Connection to Neo4j database failed.\\n Please check database connection settings.');", true);
}
}
}
//Filtering by selecting a particular Freebase Type from the dropdown list
protected void btnSearch_Click(object sender, EventArgs e)
{
string nodes = GraphDBReader.FindNode(dropdownTypes.SelectedValue);
string links = GraphDBReader.RetrieveRelationships(dropdownTypes.SelectedValue);
txtJson.Value = "{" + "\"nodes\":[" + nodes + "]," + "\"links\":[" + links + "]" + "}";
lblNodesCount.Text = GraphDBReader.GetNodesCount().ToString();
lblLinksCount.Text = GraphDBReader.GetLinksCount().ToString();
ScriptManager.RegisterStartupScript(this, typeof(Page), "UpdateMsg", "clearGraph();onLoad();", true);
}
//Filtering by Freebase categories checkboxes
protected void chkb_CheckedChanged(object sender, EventArgs e)
{
string selectedCategories = GetSelectedCats();
string nodes = GraphDBReader.RetrieveNodes(selectedCategories);
string links = GraphDBReader.RetrieveRelationships();
txtJson.Value = "{" + "\"nodes\":[" + nodes + "]," + "\"links\":[" + links + "]" + "}";
lblNodesCount.Text = GraphDBReader.GetNodesCount().ToString();
lblLinksCount.Text = GraphDBReader.GetLinksCount().ToString();
ScriptManager.RegisterStartupScript(this, typeof(Page), "UpdateMsg", "clearGraph();onLoad();", true);
}