Example of how to use itemeditbegin and itemeditbegin In the flex DataGrid to verify the input of a positive floating point number

<? XML version = "1.0"?>

<Mx: Application xmlns: MX = "http://www.adobe.com/2006/mxml">

<Mx: SCRIPT>

<! [CDATA [

Import MX. utils. stringutil;

Import MX. Controls. textinput;

Import MX. Events. Maid;

Import MX. Events. datagridevent;

Import MX. Controls. numericstepper;

Import MX. Collections. arraycollection;

Import MX. Controls. listclasses. idropinlistitemrenderer;

[Bindable]

Private var mydp: arraycollection = new arraycollection ([

{ARTIST: 'pavement ', album: 'slanted and enchanted', price: 11.99 },

{ARTIST: 'pavement ', album: 'crooked rain, crooked rain', price: 10.99 },

{ARTIST: 'pavement ', album: 'wowee zowee', price: 12.99 },

{ARTIST: 'pavement ', album: 'brighten the corn', price: 11.99 },

{ARTIST: 'pavement ', album: 'terror twilight', price: 11.99}

]);

// Verify the validity of the input data

Private function validateitem (Event: datagridevent): void {

// Return directly if no data is updated

If (event. Reason = maid. cancelled ){

Return;

}

VaR input: textinput = textinput (_ grid. itemeditorinstance );

VaR newdata: String = textinput (event. currenttarget. itemeditorinstance). text;

If (event. datafield = "price "){

VaR pattern: Regexp =/(0 + /. [0-9] * [1-9] {1,}) | ([1-9] [0-9] */. /d) | ([1-9] *) $ /;

Newdata = pattern.exe C (newdata) [0];

If (stringutil. Trim (newdata). Length <= 0 ){

Event. preventdefault ();

Input. errorstring = "The number format is incorrect! ";

Return;

}

}

}

// If the number is input, only numbers and decimal places can be entered in the input box.

Private function doitemeditbegin (Event: datagridevent): void {

VaR colname: String = _ grid. Columns [event. columnindex]. datafield;

If (colname = "price "){

_ Grid. createitemeditor (event. columnindex, event. rowindex );

_ Grid. itemeditorinstance. Data = _ grid. editeditemrenderer. Data;

Textinput (_ grid. itemeditorinstance). Restrict = "0-9 /.";

}

}

]>

</MX: SCRIPT>

<Mx: DataGrid id = "_ grid" dataprovider = "{mydp }"

Editable = "true"

Itemeditbegin = "doitemeditbegin (event );"

Itemeditend = "validateitem (event )"

>

<Mx: columns>

<Mx: datagridcolumn datafield = "artist"/>

<Mx: datagridcolumn datafield = "album" width = "130"/>

<Mx: datagridcolumn datafield = "price"/>

</MX: columns>

</MX: DataGrid>

</MX: Application>