c# - ASP.NET c# 修复函数库中自定义 ConfirmMessagebox 的 OK 事件

Question

我们创建了一个函数，通过 javascript 从 c# 动态显示模态弹出消息，它工作正常，但我们想添加一个参数，以便我们可以传递一个函数委托(delegate)(或事件处理程序)，如果用户按下 OK 按钮，该委托(delegate)将被调用.有什么建议吗？

Postdata:我们不想要典型的“确认你想按下这个按钮”的解决方案，而是一个在必要时在过程的任何部分询问确认的功能。示例:用户单击删除项目按钮，在代码隐藏中，您检查该项目是否具有某种依赖性，因此显示一条确认消息，其中包含传递委托(delegate) deleteitemconfirmed() 的 mensaje 函数，如果用户单击“确定”，则调用委托(delegate)...

库中的函数:

public static void Mensaje(string mensaje, EventHandler EventoClickLLamar, bool botoncancelar, string cssclass, Color colorfondo)
{
    string colorfondox = ColorTranslator.ToHtml(colorfondo);

    string idbotonok = EventoClickLLamar == null ? "" : EventoClickLLamar.Method.Name.Replace("_Click", "");
    string script =
        " function verifyStyle(selector) {" + " \r\n" +
        "   var rules;" + " \r\n" +
        "   var haveRule = false;" + " \r\n" +
        "                 " + " \r\n" +
        "   if (typeof document.styleSheets != \"undefined\") {   //is this supported" + " \r\n" +
        "     var cssSheets = document.styleSheets;" + " \r\n" +
        "     " + " \r\n" +
        "     outerloop:" + " \r\n" +
        "     for (var i = 0; i < cssSheets.length; i++) {" + " \r\n" +
        "         " + " \r\n" +
        "          //using IE or FireFox/Standards Compliant" + " \r\n" +
        "         rules =  (typeof cssSheets[i].cssRules != \"undefined\") ? cssSheets[i].cssRules : cssSheets[i].rules;" +
        " \r\n" +
        "         " + " \r\n" +
        "          for (var j = 0; j < rules.length; j++) {" + " \r\n" +
        "              if (rules[j].selectorText == selector) {" + " \r\n" +
        "                      haveRule = true;" + " \r\n" +
        "                     break outerloop;" + " \r\n" +
        "              }" + " \r\n" +
        "         }//innerloop" + " \r\n" +
        "         " + " \r\n" +
        "     }//outer loop" + " \r\n" +
        "   }//endif" + " \r\n" +
        "   " + " \r\n" +
        "     return haveRule;" + " \r\n" +
        " }//eof" + " \r\n" +

        " function setFading(o, b, e, d, f) {" + " \r\n" +
        " var t = setInterval" + " \r\n" +
        "         (" + " \r\n" +
        "           function () {" + " \r\n" +
        "               b = stepFX(b, e, 2);" + " \r\n" +
        "               setOpacity(o, b / 100);" + " \r\n" +
        "               if (b == e) {" + " \r\n" +
        "                   if (t) { clearInterval(t); t = null; }" + " \r\n" +
        "                   if (typeof f == 'function') { f(); }" + " \r\n" +
        "               }" + " \r\n" +
        "           }" + " \r\n" +
        "         , d / 50);" + " \r\n" +
        " }" + " \r\n" +
        " function setOpacity(e, o) {" + " \r\n" +
        "   // for IE" + " \r\n" +
        "   e.style.filter = 'alpha(opacity=' + o * 100 + ')';" + " \r\n" +
        "   // for others" + " \r\n" +
        "   e.style.opacity = o;" + " \r\n" +
        " }" + " \r\n" +
        " function stepFX(b, e, s) {" + " \r\n" +
        "   return b > e ? b - s > e ? b - s : e : b < e ? b + s < e ? b + s : e : b;" + " \r\n" +
        " }" + " \r\n" +

        " // we may consider adding frames support" + " \r\n" +
        " var w = window;" + " \r\n" +
        " // shortcut to document" + " \r\n" +
        " var d = w.document;" + " \r\n" +
        " // canvas, window width and window height" + " \r\n" +
        " var r = d.documentElement;" + " \r\n" +
        " var ww = w.innerWidth ? w.innerWidth + w.pageXOffset : r.clientWidth + r.scrollLeft;" + " \r\n" +
        " var wh = w.innerHeight ? w.innerHeight + w.pageYOffset : r.clientHeight + r.scrollTop;" + " \r\n" +
        " // create a block element" + " \r\n" +
        " var b = d.createElement('div');" + " \r\n" +
        " b.id = 'Message';" + " \r\n" +
        " b.className = '" + cssclass + "' || '';" + " \r\n" +
        " b.style.cssText = 'top:-9999px;left:-9999px;position:absolute;white-space:nowrap;z-index: 1001;';" +
        " \r\n" +
        " // classname not passed, set defaults" + " \r\n" +
        " if (!verifyStyle(\"." + cssclass + "\")) {" + " \r\n" +
        "   b.style.margin = '0px 0px';" + " \r\n" +
        "   b.style.padding = '8px 8px';" + " \r\n" +
        "   b.style.border = '1px solid #A4BED0';" + " \r\n" +
        "   b.style.backgroundColor = '#E0ECF1';" + " \r\n" +
        " }" + " \r\n" +
        " var bx = d.createElement('div');" + " \r\n" +
        " bx.style.cssText = 'position: absolute;left:0px;top:0px;width:100%;height:100%;text-align:center;z-index: 1000;background-color: " + //va seguido sin salto
        colorfondox + ";opacity:0.5;filter:alpha(opacity=50);'" + " \r\n" +
        " d.body.insertBefore(bx, d.body.firstChild);" + " \r\n" +
        " d.body.insertBefore(b, d.body.firstChild); " + " \r\n" +
        " // write HTML fragment to it  " + " \r\n" +
        " b.innerHTML = '<table><tr><td>" + mensaje + "</td></tr><tr><td align=\"center\">" +

        (string.IsNullOrEmpty(idbotonok)
        ? "<input type=\"submit\" value=\"Aceptar\" onClick=\"disabled=true;setFading(b, 100, 0, 1000, function () { d.body.removeChild(bx); d.body.removeChild(b); });\" >"
        : "<input type=\"submit\" value=\"Aceptar\" onClick=\"__doPostBack(\\'" + idbotonok + "\\',\\'\\')\" id=\"" + idbotonok + "\" >") +

        (botoncancelar
        ? "<input type=\"submit\" value=\"Cancelar\" onClick=\"disabled=true;setFading(b, 100, 0, 1000, function () { d.body.removeChild(bx); d.body.removeChild(b); });\" >"
        : "") +

        "</td></tr></table>';" + " \r\n" +
        " // save width/height before hiding " + " \r\n" +
        " var bw = b.offsetWidth;" + " \r\n" +
        " var bh = b.offsetHeight;" + " \r\n" +
        " // hide, move and then show" + " \r\n" +
        " b.style.display = 'none';" + " \r\n" +
        " b.style.top = (wh / 2 - bh / 2) + 'px'; //center" + " \r\n" +
        " b.style.left = (ww / 2 - bw / 2) + 'px'; //center" + " \r\n" +
        " b.style.display = 'block';" + " \r\n";

    ScriptManager.RegisterClientScriptBlock((Page)HttpContext.Current.Handler, typeof(Page), "mensaje", script, true);
}

测试页:

public partial class Test: Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
    }

    btnDeleteItem_Click(object sender, EventArgs e)
    {
        //DB checks
        ....
        ....
        //After x checks against Database we see the item has some dependency so we ask for confirmation
        FunctionsLibrary.Mensaje("This Item has x dependency, are you sure you want to delete it?", btnDeleteItemConfirmed_Click, true, "cssclassx", System.Drawing.Color.Gray);
    }

    btnDeleteItemConfirmed_Click(object sender, EventArgs e)
    {
        //delete item definitively, handle dependencies etc...
    }
}

我们无法实现的选项(以防我们走上正轨但出了点问题):

• 案例 1:(在我们的示例代码中实现的那个)使用 EventHandler + __doPostBack 因此，如果您在页面中定义了 buttonid_click，它将在回发时调用。 (事件没有上升......我们认为这是因为我们没有在页面加载中添加 Ok 控件......这给了我们案例 2)

• 案例2:保存通过的委托(delegate)函数，注册事件Page.Load+=GetPostBackControlID()，在接下来的页面加载中调用GetPostBackControlID()，检查点击的控件id是否是我们的OK按钮，如果所以调用委托(delegate)函数

Answer 1

所以您想从 Javascript 对话框与代码隐藏对话？最好的解决方案是使用 Ajax。在这里查看它是如何完成的:http://encosia.com/using-jquery-to-directly-call-aspnet-ajax-page-methods/

请记住，您将在代码隐藏中调用静态方法，因此并非页面中的所有数据都可用。例如，您可以通过 HttpCurrent 对象访问 Session 对象。

祝你好运。