javascript光标定位

一、C#代码调用

ScriptManager.RegisterStartupScript(this, this.GetType(), "focusSearchActiveObject", "focusSearchActiveObject('" + searchFieldId + "');", true);

 

二、javascript代码

function focusSearchActiveObject(searchID) {
    var searchContainer = document.getElementById(searchID);
    var targetSubControl = findSubControlByName(searchContainer, getActiveNameFromCookie());
    if (targetSubControl != null) {
        targetSubControl.focus();
        if (targetSubControl.tagName.toLowerCase() == "input") {
            var rtextRange = targetSubControl.createTextRange();
            rtextRange.moveStart("character", targetSubControl.value.length);
            rtextRange.collapse(true);
            rtextRange.select();
        }
    }
    clearActiveNameOnCookie();
}
function findSubControlByName(containerObject, subControlName) {
    var targetSubControl = null;
    for (var i = 0; i < containerObject.childNodes.length; i++) {
        if (isFormControl(containerObject.childNodes[i])) {
            if (containerObject.childNodes[i].getAttribute("name") == subControlName) {
                targetSubControl = containerObject.childNodes[i];
                break;
            }
        }
        else {
            if (containerObject.childNodes[i].childNodes.length > 0) {
                targetSubControl = findSubControlByName(containerObject.childNodes[i], subControlName);
                if (targetSubControl != null) {
                    break;
                }
            }
        }
    }
    return targetSubControl;
}
function isFormControl(control) {
    if (control.tagName == undefined) {
        return false;
    }
    if (control.tagName.toLowerCase() == "input") {
        return true;
    }
    else if (control.tagName.toLowerCase() == "select") {
        return true;
    }
    else if (control.tagName.toLowerCase() == "textarea") {
        return true;
    }
    else {
        return false;
    }
}

function setActiveNameToCookie(objName) {
    var str = "input_currentActive=" + objName;
    document.cookie = str;
}
function getActiveNameFromCookie() {
    var arrStr = document.cookie.split("; ");
    for (var i = 0; i < arrStr.length; i++) {
        var temp = arrStr[i].split("=");
        if (temp[0] == "input_currentActive")
            return unescape(temp[1]);
    }
}
function clearActiveNameOnCookie() {
    var date = new Date();
    date.setTime(date.getTime() - 10000);
    document.cookie = "input_currentActive=''; expires=" + date.toGMTString();
}

 

参考：

http://www.ibulabula.com/?p=195