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POProblems creating/rendering a simple composite control
 

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  1. POProblems creating/rendering a simple composite control
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    <p>I'm building a primarily data-entry application in asp.net. Because the design pane never accurately reflects the runtime appearance I do most of my work re page construction in the HTML view. Unfortunately endlessly adding tables, tr's td's labels and textboxes is very tedious, and I want to create some composite controls to do a lot of this work for me.</p> <p>I am working on a composite to generate a div, table, tablerow with 4 cells, being<br> a) a cell to indent what follows,<br> b) a cell to contain a label<br> c) a cell to contain a textbox, &amp;<br> d) a cell to contain an asterisk label (for indicating a mandatory item)</p> <p>The problem I have is that I'm unsure how to make the various components render correctly.</p> <p>My code is as follows:</p> <pre><code> public class ReadyTextBox : WebControl, INamingContainer { #region private TextBox _txt = null; BaseLabel _lbl = null; Label _astrx = null; int _indent = 0; int _lblwidth = 0; int _txtwidth = 0; #endregion public ReadyTextBox() { txt = new TextBox(); lbl = new BaseLabel(); _astrx = new Label(); _astrx.Text = "*"; _astrx.ForeColor = System.Drawing.Color.Red; } #region properties public BaseLabel lbl { set { _lbl = value; } get { return _lbl; } } public TextBox txt { set { _txt = value; } get { return _txt; } } public string Caption { set { _lbl.Text = value + ":"; } get { return _lbl.Text; } } public int Indent { set { _indent = value; } get { return _indent; } } public int LabelWidth { set { _lblwidth = value; } get { return _lblwidth; } } public int TextWidth { set { _txtwidth = value; } get { return _txtwidth; } } public override bool Enabled { set { if (!(_txt == null)) _txt.Enabled = value; } get { if (!(_txt == null)) return _txt.Enabled; else return false; } } public string LabelClass { set { if (!(_lbl == null)) _lbl.CssClass = value; } } public bool Mandatory { set { if (!(_txt == null)) _astrx.Visible = value; } } public string TextClass { set { if (!(_txt == null)) _txt.CssClass = value; } } public int TextLen { set { if (!(_txt == null)) _txt.MaxLength = value; } } public TextBoxMode TextMode { set { if (!(_txt == null)) _txt.TextMode = value; } } public int TextRows { set { if (!(_txt == null)) _txt.Rows = value; } } #endregion #region rendering //build UI protected override void CreateChildControls() { Controls.Clear(); HtmlGenericControl div = new HtmlGenericControl("div"); div.ID = "div_" + this.ID; div.Attributes.Add("class", "clear"); Table tbl = new Table(); tbl.ApplyStyle(CreateControlStyle()); tbl.CellSpacing = 1; tbl.CellPadding = 1; div.Controls.Add(tbl); TableRow r = new TableRow(); tbl.Rows.Add(r); if (Indent == 0) Indent = 4; if (LabelWidth == 0) LabelWidth = 30; if (TextWidth == 0) TextWidth = 40; if (Indent + LabelWidth + TextWidth &gt; 99) throw new Exception("Component widths exceed 99%, for control: " + this.ID); TableCell c = new TableCell(); c.Width = Unit.Percentage(Indent); r.Cells.Add(c); c = new TableCell(); c.Width = Unit.Percentage(LabelWidth); r.Cells.Add(c); c.Controls.Add(lbl); c = new TableCell(); c.Width = Unit.Percentage(TextWidth); r.Cells.Add(c); c.Controls.Add(txt); c = new TableCell(); c.Width = Unit.Percentage(100 - (Indent + LabelWidth + TextWidth)); r.Cells.Add(c); c.Controls.Add(_astrx); } //render UI protected override void Render(HtmlTextWriter writer) { //these statements all run, but by themselves, nothing is rendered. base.EnsureChildControls(); PrepareForRender(); RenderContents(writer); //this code doesnt work; for some reason controls.count is 0 at this point //if (this.Controls.Count != 1) return; //HtmlGenericControl div = (HtmlGenericControl)this.Controls[0]; //div.RenderControl(writer); //Table t = (Table)div.Controls[0]; //t.RenderControl(writer); //TableRow r = t.Rows[0]; //r.RenderControl(writer); //TableCell c = r.Cells[0]; //c.RenderControl(writer); //c = r.Cells[1]; //c.RenderControl(writer); //Label l = (c.Controls[0] as Label); //l.RenderControl(writer); //c = r.Cells[2]; //c.RenderControl(writer); //TextBox x = (TextBox)c.Controls[0]; //x.RenderControl(writer); //c = r.Cells[3]; //c.RenderControl(writer); //l = (c.Controls[0] as Label); //l.RenderControl(writer); //these statements work, but the controls are rendered //without the indentation &amp; width sizing intended. lbl.RenderControl(writer); txt.RenderControl(writer); _astrx.RenderControl(writer); } protected virtual void PrepareForRender() { if (Controls.Count != 1) return; HtmlGenericControl div = (HtmlGenericControl)Controls[0]; Table t = (Table)div.Controls[0]; t.CopyBaseAttributes(this); if (ControlStyleCreated) t.ApplyStyle(ControlStyle); TableRow r = t.Rows[0]; BaseLabel b = (r.Cells[1].Controls[0] as BaseLabel); if (b != null) b.ForeColor = ForeColor; TextBox tb = (r.Cells[2].Controls[0] as TextBox); if (tb != null) b.ForeColor = System.Drawing.Color.Black; Label l = (r.Cells[3].Controls[0] as Label); if (l != null) l.ForeColor = System.Drawing.Color.Red; } #endregion } } </code></pre> <p>Can anyone point out the problem is, or give me a solution or solution snippet? I haven't managed to find a useful example on the web. </p>
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. USAdam Lear
    1. USJohn Bingham
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
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      1. PTAnswer
    1. This table or related slice is empty.
    1. COCan you describe your rendering problems? What happens now that you don't want to happen?
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      1. POProblems creating/rendering a simple composite control
      1. USAdam Lear
 

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