Hi Peter,
Welcome to the Ext.NET forums!
A FieldSet doesn't listen its items' events.
Well, the best is to listen TextFields' event. You can attach listeners on a FieldSet level.
Example
<%@ Page Language="C#" %>
<%@ Register Assembly="Ext.Net" Namespace="Ext.Net" TagPrefix="ext" %>
<!DOCTYPE html>
<html>
<head runat="server">
<title>Ext.NET v2 Example</title>
<script>
var onBeforeRender = function (fieldSet) {
var items = fieldSet.items.getRange(),
i;
for (i = 0; i < items.length; i++) {
items[i].on("change", onTextFieldChange, fieldSet);
}
};
var onTextFieldChange = function (textField) {
var fieldSet = this;
console.log("change");
};
</script>
</head>
<body>
<form runat="server">
<ext:ResourceManager runat="server" />
<ext:FieldSet runat="server">
<Items>
<ext:TextField runat="server" />
<ext:TextField runat="server" />
</Items>
<Listeners>
<BeforeRender Fn="onBeforeRender" />
</Listeners>
</ext:FieldSet>
<ext:FieldSet runat="server">
<Items>
<ext:TextField runat="server" />
<ext:TextField runat="server" />
</Items>
<Listeners>
<BeforeRender Fn="onBeforeRender" />
</Listeners>
</ext:FieldSet>
</form>
</body>
</html>
Another approach could be using a FormPanel and its FieldValidityChange event.
Example
<%@ Page Language="C#" %>
<%@ Register Assembly="Ext.Net" Namespace="Ext.Net" TagPrefix="ext" %>
<!DOCTYPE html>
<html>
<head runat="server">
<title>Ext.NET v2 Example</title>
<script>
var onFieldValidityChange = function (formPanel, textField) {
var fieldSet = textField.up("fieldset");
console.log("FieldValidityChange");
};
</script>
</head>
<body>
<form runat="server">
<ext:ResourceManager runat="server" />
<ext:FormPanel runat="server">
<Items>
<ext:FieldSet runat="server">
<Items>
<ext:TextField runat="server" AllowBlank="false" />
<ext:TextField runat="server" AllowBlank="false" />
</Items>
</ext:FieldSet>
<ext:FieldSet runat="server">
<Items>
<ext:TextField runat="server" AllowBlank="false" />
<ext:TextField runat="server" AllowBlank="false" />
</Items>
</ext:FieldSet>
</Items>
<Listeners>
<FieldValidityChange Fn="onFieldValidityChange" />
</Listeners>
</ext:FormPanel>
</form>
</body>
</html>
