(Wdevs) A DataGrid for my Contacts box

2004-11-22 #qc,#wdevs

Again, this new module is intended to be a very simple one. I will work later on a more sophisticated contact module, based on the vcard datas. As with the Links box, the Contacts box will contain a list of items. Consequently, the majority of its code can be write with copy and paste.

The SQL database table has an AUTO_INCREMENT / IDENTITY id, like in the qc_Links table.

CREATE TABLE qc_Contacts (
    idContact int AUTO_INCREMENT NOT NULL,
    idBox VARCHAR(20) NOT NULL,
    name VARCHAR(50) NOT NULL,
    role VARCHAR(100),
    email VARCHAR(100) NOT NULL,
    phone1 VARCHAR(50),
    phone2 VARCHAR(50),
    CONSTRAINT PK_qc_Contacts PRIMARY KEY (idContact)

In the Links box, I had been able to avoid DataGrid because I wanted to render a semantic list with ul and li tags. But in this case, I really need an html table tag to render the content as records. So my ascx uses a DataGrid.

<%@ Control Language="c#" AutoEventWireup="false" Codebehind="listContacts.ascx.cs" Inherits="qc.Classic.Contacts.listContacts" TargetSchema="http://schemas.microsoft.com/intellisense/ie5"%>
    <asp:BoundColumn HeaderText="Name" DataField="name" />
    <asp:BoundColumn HeaderText="Role" DataField="role" DataFormatString="{0:d}" />
    <asp:HyperLinkColumn HeaderText="Email" DataTextField="email" DataNavigateUrlField="email" DataNavigateUrlFormatString="mailto:{0}" />
    <asp:BoundColumn HeaderText="Phone 1" DataField="phone1" DataFormatString="{0:N0}" />
    <asp:BoundColumn HeaderText="Phone 2" DataField="phone2" DataFormatString="{0:N0}" />

There is nothing extraordinary compared to the IBuySpy version, except that at least all presentations informations are based on css styles rather than in-asp.net attributes. Yet, ASP.NET adds specials html attributes.

  • with FireFox : <table class="dg_table" cellspacing="0" rules="all" border="1" id="_ctl0_boxDatagrid">
  • with IE6 : <table class="dg_table" cellspacing="0" rules="all" border="1" id="_ctl0_boxDatagrid" style="border-collapse:collapse;">

And of course, this stupid datagrid control don’t accept CellSpacing="" or don’t remove html attributes when I add rules="", border="", BorderStyle="None" or style="".

However, I succeeded in defining a pretty css style for my table, but it depends on the fact that I add a CellSpacing=”2” attribute for the DataGrid control server. So I try another way to remove useless attributes by overriding the Render method.

protected override void Render(HtmlTextWriter writer) {
  StringBuilder stringBuilder = new StringBuilder();
  StringWriter stringWriter = new StringWriter(stringBuilder);
  HtmlTextWriter htmlWriter = new HtmlTextWriter(stringWriter);
  string html = stringBuilder.ToString();
  html = html.Replace(" cellspacing=\"0\"", "");
  html = html.Replace(" rules=\"all\"", "");
  html = html.Replace(" border=\"1\"", "");
  html = html.Replace(" style=\"border-collapse:collapse;\"", "");

In order to explore all the possible solutions, I made another attempt with a simple Repeater. This method avoids the override hack and allows a more semantical html table, which uses thead, tbody and th tags. It’s less practical to implement, but it’s a better method if I choose to build a pure CSS scrollable table with fixed header.

And for the fun, I highlight the table row where mouse is over with the :hover property for Firefox or a very old htc for IE.

I will try to put on line this evening with some other modules of the week-end.