由于包含了眾多的過濾選項(xiàng)和即時數(shù)據(jù)過濾功能，WebGrid提供相關(guān)的搜索結(jié)果時，比以往任何時候都更加迅速。WebGrid網(wǎng)格包含了直觀的過濾接口，如自動過濾建議，過濾狀態(tài)指示，預(yù)定義過濾類型等等，讓用戶更有效地處理數(shù)據(jù)。本文重點(diǎn)討論WebGrid表格的過濾以及如何使用HTML按鈕過濾或者不過濾器某些列。您將使用到兩個HTML按鈕，一個用來設(shè)置過濾某一列，另外一個用來不過濾該列。

接下來，我們將完成以下2個任務(wù)：

• 準(zhǔn)備HTML按鈕
• 創(chuàng)建客戶端方法來過濾??某列

一、準(zhǔn)備HTML按鈕

在WebForm中新增WebGrid和兩個HTML按鈕。綁定數(shù)據(jù)到WebGrid。雙擊每個HTML按鈕，重命名為addFilter和removeFilter方法。

<script language="javascript" type="text/javascript">
function addFilter() {

}

function removeFilter() {

}
</script>

二、創(chuàng)建客戶端方法來過濾??某列

在ddFilter方法中通過以下代碼來過濾某一列。

function addFilter() {
var grid = ISGetObject("WebGrid1");
 var newFilter = new WebGridFilter(); // construct WebGridFilter object

newFilter.ColumnMember = "ContactTitle"; // which column do you want to filter
newFilter.FilterType = "EqualTo"; // use the same enumeration as in server side
newFilter.FilterText = "Owner"; // what is the key phrase of the filter

grid.RootTable.FilteredColumns.Add(newFilter); // add new filter column the same way as in server
grid.RootTable.UpdateUI(); // update User Interface to reflect changes
grid.Refresh(); // perform refresh to get the filter applied

alert("ContactTitle Column is now filtered!");
}

Use the following code inside the removeFilter method to enable the filter of a certain column:

function removeFilter() {
var grid = ISGetObject("WebGrid1");

grid.RootTable.FilteredColumns.Remove(grid.RootTable.FilteredColumns[0], true);
grid.RootTable.FilteredColumns[0].FilterType = '';
grid.RootTable.FilteredColumns[0].FilterText = '';
grid.RootTable.UpdateUI(); // update User Interface to reflect changes
grid.Refresh(); // perform refresh to get the filter removed

alert("Filtered ContactTitle Column is now removed!");
}