如何使用javascript检查页面是否首次加载 [英] how to check if page is loaded for the first time using javascript

问题描述

我想检查页面是否是第一次加载，然后显示该过滤器.如果我将showFiltermenu()放在pageLoad函数中，那么它将在每次页面加载时显示，但我只希望它第一次显示.我尝试使用Page.IsPostBack，但是不显示过滤器.

I want to check if the page is being loaded for the first time, and if it is then display the filter. If I put showFiltermenu() in the pageLoad function then it will show every time the page is loaded but I just want it display the first time. I tried using Page.IsPostBack but that doesn't display the filter.

    <script type="text/javascript">
        function showFiltermenu() {
            $("#filtermenuDrop").toggle('fold', {}, 500);
        }
        function closefiltermenu() {
            $("#filtermenuDrop").toggle('fold', {}, 500);
        }

function pageLoad() {
        $("input[rel^='datepicker']").datepicker({
            dateFormat: 'dd/mm/yy',
            changeMonth: true,
            yearRange: "c-50:c+50",
            changeYear: true,
            showOn: "both",
            firstDay: 1,
            buttonImage: "../images/icons/buttons/basic1-049-small.png"
        });
        <% if (Page.IsPostBack)
           { %>
                showFiltermenu();
        <% } %>

        ShadowboxInit();

    }

推荐答案

感谢每个人的回答，但是我的问题中只有一个简单的错误.我在if语句中忘记了!.现在可以检查页面是否是第一次加载.

Thanks everyone for their answers but there was just a simple mistake in my question. I forgot the ! in the if statement. This now works to check if the page is loaded for the first time.

<% if (!Page.IsPostBack)
           { %>
                showFiltermenu();
        <% } %>

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