Used within the cfform tag. Puts a grid control (a table of data) in a ColdFusion form. To specify grid columns and row data, use the cfgridcolumn and cfgridrow tags, or use the query attribute, with or without cfgridcolumn tags.

Forms tags

cfapplet, cfcalendar, cfgridcolumn, cfgridrow, cfgridupdate, cfform, cfformgroup, cfformitem, cfgrid, cfinput, cfselect, cfslider, cftextarea, cftree

ColdFusion MX 7:

• Added the format attribute and support for Flash and XML output.
• Added enabled, onChange, style, tooltip, and visible attributes (Flash format only).

ColdFusion MX: Changed the rowHeaderWidth attribute: ColdFusion does not use the rowHeaderWidth attribute. You can omit it.

This tag must be in a cfform tag block.

An applet format grid requires the client to download a Java applet. Also, if the client does not have an up-to-date Java plugin installed, the system might also have to download an updated Java plugin to display the an applet format grid. A Flash format grid generates a Flash control, and can be embedded in an HTML format cfform tag. For this tag to work properly in either Flash or applet format, the browser must also be JavaScript-enabled.

You can populate a cfgrid with data from a cfquery. If you do not specify any cfgridcolumn tags in the cfgrid body, ColdFusion generates a grid with the following:

• A column for each column in the query.
• A default header for each column, created by replacing hyphen or underscore characters in the table column name with spaces. The first character, and any character after a space, are changed to uppercase; all other characters are lowercase.

This tag requires an end tag.

This tag returns data by setting form variables in the data submitted to the form's action page, as an HTML form control does. Because the data can vary, depending on the tag's SelectMode attribute value, the form variables that are returned also vary depending on this value.

In general, the data returned falls into one of these categories:

• Simple data, returned from simple select operations
• Complex data, returned from insert, update and delete operations

The data that form variables return to the cfform's action page contains information about which cells the user selected. In general, ColdFusion makes this data available in the action page, as ColdFusion variables in the Form scope, with the naming convention form.#GridName#.#ColumnName#

Each SelectMode returns these form variable(s):

• SelectMode="single"

form.#GridName#.#ColumnName# = "SelectedCellValue"

• SelectMode="column"

form.#GridName#.#ColumnName# = "ValueOfCellRow1, 
ValueOfCellRow2, ValueOfCellRowN"

• SelectMode="row"

form.#GridName#.#Column1Name# = "ValueOfCellInSelectedRow"
form.#GridName#.#Column2Name# = "ValueOfCellInSelectedRow"
form.#GridName#.#ColumnNName# = "ValueOfCellInSelectedRow"

The grid returns a large amount of data, to inform the action page of inserts, updates or deletes that the user made to the grid. In most cases, you can use the cfgridupdate tag to automatically gather the data from the form variables; the tag collects data, writes SQL calls, and updates the data source.

If you cannot use cfgridupdate (if, for example, you must distribute the returned data to more than one data source), you must write code to read form variables. In this mode, ColdFusion creates the following array variables in the Form scope for each cfgrid:

form.#GridName#.#ColumnName#
form.#GridName#.original.#ColumnName#
form.#GridName#.RowStatus.Action

Each table row that contains an update, insert, or deletion has a parallel entry in each of these arrays. To view all the information for all the changes, you can traverse the arrays, as in this example. To make it work with a cfgrid on a submitted cfform, set the GridName variable to the name of the grid and the ColNameList to a list of the grid columns.

<cfloop index="ColName" list="#ColNameList#">
   <cfif IsDefined("form.#GridName#.#ColName#")>   
      <cfoutput><br>form.#GridName#.#ColName#:<br></cfoutput>
      
      <cfset Array_New = form.[#GridName#][#ColName#]>
      <cfset Array_Orig = form[#GridName#]['original'][#ColName#]>
      <cfset Array_Action = form[#GridName#]RowStatus.Action>
      
      <cfif NOT IsArray(Array_New)>
         <b>The form variable is not an array!</b><br>
      <cfelse>
         <cfset size = ArrayLen(Array_New)>
         <cfoutput> 
         Result Array Size is #size#.<br>
         Contents:<br>
         </cfoutput>
         
         <cfif size IS 0>
            <b>The array is empty.</b><br>
         <cfelse>
            <table BORDER="yes">
               <tr> 
                  <th>Loop Index</TH>
                  <th>Action</TH> 
                  <th>Old Value</TH> 
                  <th>New Value</TH>
               </tr>
               <cfloop index="LoopCount" from="1" to=#size#>   
                   <cfset Val_Orig   = Array_Orig[#LoopCount#]>   
                   <cfset Val_New    = Array_New[#LoopCount#]>   
               <cfset Val_Action   = Array_Action[#LoopCount#]>
               <cfoutput>
               <tr>
                  <td>#LoopCount#</td>
                  <td>#Val_Action#</td>
                  <td>#Val_Orig#</td>
                  <td>#Val_New#</td>
               </tr>
               </cfoutput>
               </cfloop>
            </table>            
         </cfif>         
      </cfif>   

   <cfelse>
      <cfoutput>form.#GridName#.#ColName#: NotSet!</cfoutput><br>   
   </cfif>   
</cfloop>

When specifying a URL with grid items using the href attribute, the selectMode attribute value determines whether the appended key value is limited to one grid item or extends to a grid column or row. When a user clicks a linked grid item, a cfgridkey variable is appended to the URL, in this form:

http://myserver.com?cfgridkey=selection

If the appendKey attribute is set to no, no grid values are appended to the URL.

The value of selection is determined by the value of the selectMode and attribute:

• If you specify a hrefKey attribute, selection is the field value of the column specified by the attribute. Otherwise, it is one of the following:
• If selectMode="Single", selection is the value of the column clicked.
• If selectMode="Row", selection is a comma-delimited list of column values in the clicked row, beginning with the value of the first cell in the row.
• If selectMode="Column", selection is a comma-delimited list of row values in the clicked column, beginning with the value of the first cell in the column.

The following example creates a Flash form that displays a set of available courses from the CourseList table in the cfdocexamples database. For more complex examples that use the cfgrid tag, see cfgridcolumn, cfgridrow, and cfgridupdate.

<!--- Query the database to fill up the grid. --->
<cfquery name = "GetCourses" dataSource = "cfdocexamples">
SELECT Course_ID, Dept_ID, CorNumber,
CorName, CorLevel
FROM CourseList
ORDER by Dept_ID ASC, CorNumber ASC
</cfquery>

<h3>cfgrid Example</h3>
<I>Currently available courses</i>
<!--- cfgrid must be inside a cfform tag. --->
<cfform>
   <cfgrid name = "FirstGrid" format="Flash"
      height="320" width="580"
      font="Tahoma" fontsize="12"
      query = "GetCourses">
   </cfgrid>
</cfform>