MVC WebGrid - 如何以编程方式获取当前页面、排序列等

Question

如何以编程方式（在 JavaScript 中）获取 ASP.NET MVC WebGrid 的当前页码、最后一个排序列和排序方向？

是否可以在调用 $("#grid").load() 方法之前更新参数？

Answer 1

唯一可能的解决方案是使用 jQuery 来检索：
- 从第一列标题中获取页码的“href”属性
- 从“下一页编号”的“href”属性获取排序列和排序方向。

function reloadGrid(form) {
    var grid = form._grid ? form._grid.value : "grid";
    var args = {};
    updateQueryParams(args, grid + " th a");
    args.sort = "";
    args.sortdir = "";
    updateQueryParams(args, grid + " tfoot a");
    args.page = 1;

    for (var i = 0; i < form.elements.length; i++) {
        var el = form.elements[i];
        if (el.type == "text" || el.type == "select" || (el.type == "radio" && el.checked))
            args[el.name] = el.value;
        else if (el.type == "checkbox")
            args[el.name] = el.checked;
    }

    //get controller name
    var s = $("#grid th a")[0].onclick.toString();
    s = s.substring(s.indexOf("/"));
    var controller = s.substring(0, s.indexOf("?"));

    var queryString = "";
    for (var key in args)
        queryString += "&" + key + "=" + escape(args[key]);

    var url = controller + "?" + queryString.substring(1);
    $("#" + grid).load(url + " #" + grid);
}


function updateQueryParams(args, path) {
    var links = $("#" + path);
    if (links.length == 0)
        return;

    var s = links[0].onclick.toString();
    s = s.substring(s.indexOf("?") + 1);
    s = s.substring(0, s.indexOf(" #"));

    var a = /\+/g;  // Regex for replacing addition symbol with a space
    var r = /([^&=]+)=?([^&]*)/g;
    var d = function (s) { return decodeURIComponent(s.replace(a, " ")); };
    var q = s;

    while (e = r.exec(q))
        args[d(e[1])] = d(e[2]);
}