在mvc中多次调用Ajax请求

Whenever I tried to render partial view on bootstrap modal, the ajax request which is rendering the partial view is getting called multiple times. I am making ajax request on button click which is on the Main view.

每当我尝试在bootstrap模式上渲染局部视图时，渲染局部视图的ajax请求就会被多次调用。我在主视图上的按钮单击时发出ajax请求。

Main View :- While rendering the main view I have rendered the partial view also like below

主视图： - 渲染主视图时，我已经渲染了局部视图，如下所示

<div class="modal fade" id="surveyPreviewModal" data-backdrop="static" data-keyboard="false" tabindex="-1" role="dialog" aria-labelledby="surveyPreviewLabel" aria-hidden="true">
    <div class="modal-lg modal-dialog">
        <div class="modal-content" id="surveyPreviewContent">
            <div class="modal-header">
                <button type="button" class="close" data-dismiss="modal" aria-hidden="true">
                    &times;
                </button>
                <h4 class="modal-title" id="surveyPreviewLabel">Survey Preview</h4>

            </div>
            <div class="modal-body" id="surveyPreviewBody">
                @Html.Partial("_SurveyPreview",new LMS_TraineeSurveyPaginationViewModel())
            </div>
        </div>
    </div>
</div>

and this is the button which is on main view rendering the partial view in modal

这是主视图上的按钮，用于渲染模态中的局部视图

<button id="btnSurveyPreview" class="btn btn-primary" data-toggle="modal" data-target="#surveyPreviewModal" data-surveyID="@ViewBag.SurveyID">
Survey Preview
</button>

In partial view I have written the below code. On bootstrap modal show event I am calling SurveyPreview(js function) written in partial view.

在局部视图中，我编写了以下代码。在bootstrap模态show事件中，我调用在局部视图中编写的SurveyPreview（js函数）。

@model LMS_TraineeSurveyPaginationViewModel
$(document).ready(function () {

    $('#surveyPreviewModal').on('show.bs.modal', function (e) {

        surveyID = $(e.relatedTarget).attr('data-surveyID');

        SurveyPreview(@SurveyPageTypePageNumber.StartPage,null);

    });
})

And in SurveyPreview function I am making ajax request as follows

在SurveyPreview函数中，我正在制作ajax请求，如下所示

function SurveyPreview(page,btnID) {

   ....Get SurveyID and page code.....

 $.post('@Url.Action("SurveyPreview", "Survey")', { SurveyID : surveyID, page : page },
             function (data) {

                 $('#surveyPreviewBody').html('');
                 $('#surveyPreviewBody').html(data);

                 SetProgressBar(page,'@(Model==null?0: Model.Pager.TotalPages)');

             }).fail(function () {
                 alert("error in GetTraineeSurvey");
             }).success(function () {

             });
}

And from SurveyPreview controller method I am returning the same partial view with model and appending the results to modal body.

从SurveyPreview控制器方法我返回与模型相同的局部视图，并将结果附加到模态体。

public PartialViewResult SurveyPreview(int SurveyID, int page)
{
--- some code--
return PartialView("_SurveyPreview", viewModel);
}

Lets I clicked on button for the first time, then modal is getting opened and after closing and re-opening it the ajax request made twice, then again closing and re-opening ajax request made thrice. Every time the counter is getting increased

让我第一次点击按钮，然后模态打开，关闭后重新打开它，两次ajax请求，然后再次关闭并重新打开ajax请求三次。每次计数器都增加

Also I have Next/Prev buttons on partial view which is rendering the same partial view.

此外，我在局部视图上有下一个/上一个按钮，它们呈现相同的局部视图。

Is the correct sequence of events happening here ? Or am I missing something here ?

这里发生了正确的事件顺序吗？或者我在这里遗漏了什么？

Any help on this appreciated !

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1 个解决方案

#1

You are attaching multiple click handlers to the button, every time you make an AJAX request. I would recommend you moving this javascript outside your partial view so that it gets executed only once. For example you could put it inside the main view:

每次发出AJAX请求时，都会在按钮上附加多个单击处理程序。我建议你将这个javascript移到局部视图之外，这样它才能执行一次。例如，您可以将其放在主视图中：

<script>
    $(document).ready(function () {
        $('#surveyPreviewModal').on('show.bs.modal', function (e) {
            surveyID = $(e.relatedTarget).attr('data-surveyID');
            SurveyPreview(@SurveyPageTypePageNumber.StartPage, null);
        });
    });

    function SurveyPreview(page, btnID) {

        ....Get SurveyID and page code.....

        $.post('@Url.Action("SurveyPreview", "Survey")', { SurveyID : surveyID, page : page },
             function (data) {
                 $('#surveyPreviewBody').html(data);
                 var totalPages = $('#totalPages').attr('data-pages');
                 SetProgressBar(page, totalPages);
             }).fail(function () {
                 alert("error in GetTraineeSurvey");
             }).success(function () {
        });
    }
</script>

and of course inside your partial you could put a <div> that will contain the total pages based on the view model:

当然在你的局部内你可以放一个

，它将包含基于视图模型的总页数：

1 个解决方案

#1

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