选择控件单击选择事件使选中的文件至顶状态

有时候需要对 dropdownlist,gridview 增加选择事件的时候，需要至当前选中的文件为为上下居中状态可以使用以下代码方法实现。

scrollIntoView Method

Internet Development Index

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Causes the object to scroll into view, aligning it either at the top or bottom of the window.

Syntax

object.scrollIntoView( [bAlignToTop])

Parameters

bAlignToTop

Optional. Boolean that specifies one of the following values: true Default. Scrolls the object so that top of the object is visible at the top of the window. false Scrolls the object so that the bottom of the object is visible at the bottom of the window.

Return Value

No return value.

Remarks

The scrollIntoView method is useful for immediately showing the user the result of some action without requiring the user to manually scroll through the document to find the result.

Depending on the size of the given object and the current window, this method might not be able to put the item at the very top or very bottom, but will position the object as close to the requested position as possible.

 

Example

 

 protected void **_SelectedIndexChanged(object sender, EventArgs e)
 {

     //******

     this.Scroll(**.SelectedIndex);

}

 

void Scroll(int index)
{
            string s = "<script>function window.onload(){document.all('" + this.**.ClientID + "').options   [" + index + "].scrollIntoView();}</script>";
            Page.RegisterStartupScript("", s);

}