javascript - 如何使用javascript将焦点设置在链接按钮单击的文本框上

Question

我有这个java脚本函数

function showHideSearchPanel(dv) {

var Header = dv == 'Charts' ? 'ChartSearch' : 'ReportSearch';
var div = "ctl00_ContentPlaceHolder1_dv" + Header;
var panel = "ctl00_ContentPlaceHolder1_pnl" + Header;
var hiddenField = "ctl00_ContentPlaceHolder1_hdn" + Header + "Mode";

// I try to add this code in js but it not work
**var serchtextbox = document.getElementById("ctl00_ContentPlaceHolder1_txtSearchName");
if (serchtextbox != null) {
    serchtextbox.focus();
}**
// I try to add this code in js but it not work

if ($("#" + div).attr('display') != 'block') {
    window.status = 'Expanding contents....';
    $("#" + div).slideToggle("slow");
    $("#" + div).attr('visibility', 'visible');
    $("#" + div).attr('display', 'block');
    window.status = 'Done';
}
else {
    window.status = 'Collapsing contents....';
    $("#" + div).hide("slow");
    $("#" + div).attr('visibility', 'hidden');
    $("#" + div).attr('display', 'none');
    window.status = 'Done';
}
$("#" + hiddenField).attr('value', ($("#" + hiddenField).attr('value') == 'On' ? 'Off' : 'On'));

}

这是我的简单菜单

单击搜索按钮时，我想在下图中的搜索文本框上设置焦点