Question

我有一个Web表单（我认为符合HTML5！），它使用经典ASP和VBScript，带有一些自由文本字段，一个日期选择器和一些下拉菜单，其中的选项是从各种SQL查询中提取的。（这是用于测试此问题的表单的精简基本版本。）

其中一个下拉列表需要显示依赖于上一个下拉列表中的选项的选项。

我能够使用javascript onChange获取所选选项并将其显示在页面上（这是当前的get_boiler脚本所做的，但我无法弄清楚如何在用于显示的查询中使用它必要的选项。

OnChange获取值的下拉列表是“Installed Boiler Make”，将使用该值作为SQL查询的一部分的下拉列表是“Installed Boiler Model”

我考虑将值作为查询字符串推出并重新加载表单，但之后我丢失了所有先前输入的值，这不是理想的结果。

有人能指出我正确的方向吗？需要使用所选值的查询是名为“models”的记录集。我已经把????作为SQL查询中的临时值。

希望我已经正确解释了这一点并在帖子中使用了正确的标签。我不是在寻找有人为我做这项工作，只是指出我正确的方向。我已经通过Stackoverflow很好地了解了与此相同的问题，但没有找到任何试图做同样的事情。

<!--#include virtual="/includes/functions.asp"-->

<!DOCTYPE html>

<%
Call OpenDB()
Call OpenRecordSet(heatcontrols, "select callmd3_field_no, callmd3_listitem from dbo.Call_More_Def3 where callmd3_link_to_def1 = 'LOG' and callmd3_field_no = '170' and callmd3_listorder not in ('1') order by callmd3_listorder")
Call OpenRecordSet(maincontrols, "select callmd3_field_no, callmd3_listitem from dbo.Call_More_Def3 where callmd3_link_to_def1 = 'LOG' and callmd3_field_no = '168' and callmd3_listorder not in ('1') order by callmd3_listorder")
Call OpenRecordSet(installtype, "select callmd3_field_no, callmd3_listitem from dbo.Call_More_Def3 where callmd3_link_to_def1 = 'LOG' and callmd3_field_no = '171' and callmd3_listorder not in ('1') order by callmd3_listorder")
Call OpenRecordSet(makes, "select make from lu_make where make not in ('-') order by make")
Call OpenRecordSet(models, "select model from lu_model where link_to_make = '????' order by model")
%>

<html>

<head>
    <title>TEST</title>
    <meta charset="UTF-8">  
    <link rel="stylesheet" href="/includes/css/installer.css"/>
    <link rel="stylesheet" href="/includes/datepicker/jquery.ui.all.css"/>
    <script type="text/javascript" src="/includes/scripts/jquery.min.js"></script>
    <script type="text/javascript" src="/includes/scripts/jquery-1.7.1.js"></script>
    <script type="text/javascript" src="/includes/scripts/jquery.ui.core.js"></script>
    <script type="text/javascript" src="/includes/scripts/jquery.ui.datepicker.js"></script>

    <script>
        $(function() {
        $( "#surveydate" ).datepicker({
                dateFormat: 'dd MM yy'
            });
        });
    </script>

    <script type="text/javascript"> 
        function get_boiler(){
            document.getElementById("boilervalue").innerHTML = document.getElementById("boilermake").value;
        return true;
        }
    </script>   

    <script type="text/javascript" src="/includes/scripts/update-validate.js"></script>
    <script type="text/javascript" src="/includes/scripts/update-showhide.js"></script>
</head>

<body>

<div class="popup-content">

    <form method="POST" name="updatejob" action="/includes/update.asp" onsubmit="return validateForm()">
        <h1>TEST FORM</h1>
        <br/>
        <b>Surveyor</b>
        <br/>
        <input type="text" name="surveyor" id="surveyor" maxlength="50" class="addjobmenudropmedium">
        <br/><br/>
        <b>Survey Date</b>
        <br/>
        <input type="text" name="surveydate" id="surveydate" class="addjobmenudropmedium">
        <br/><br/>
        <b>Heating Controls (with boiler install)</b>
        <br/>
        <select name="continst" id="continst" class="addjobmenudropsmall">
            <option value="">Select.....</option>
            <% WHILE (NOT heatcontrols.EOF) %>
                <option value="<%=heatcontrols.Fields("callmd3_listitem").value %>"><%=heatcontrols.Fields("callmd3_listitem").value %></option>
            <% heatcontrols.movenext()
            Wend %>
        </select>
        <br/><br/>
        <b>Main Heating Controls</b>
        <br/>
            <select name="heatcon" id="heatcon" class="addjobmenudrop">
                <option value="">Select.....</option>
                <% WHILE (NOT maincontrols.EOF) %>
                    <option value="<%=maincontrols.Fields("callmd3_listitem").value %>"><%=maincontrols.Fields("callmd3_listitem").value %></option>
                <% maincontrols.movenext()
                Wend %>
            </select>
        <br/><br/>      
        <b>Install Type</b>
        <br/>
            <select name="installtype" id="installtype" class="addjobmenudrop">
                <option value="">Select.....</option>
                <% WHILE (NOT installtype.EOF) %>
                    <option value="<%=installtype.Fields("callmd3_listitem").value %>"><%=installtype.Fields("callmd3_listitem").value %></option>
                <% installtype.movenext()
                Wend %>
            </select>
        <br/><br/>
        <b>Installed Boiler Make</b>
        <br/>
        <select name="boilermake" id="boilermake" class="addjobmenudrop" onChange="get_boiler()">
            <option value="">Select.....</option>
            <% WHILE (NOT makes.EOF) %>
                <option value="<%=makes.Fields("make").value %>"><%=makes.Fields("make").value %></option>
            <% makes.movenext()
            Wend %>
        </select>
        <br/><br/>
        <b>Installed Boiler Model</b>
        <br/>
        <select name="boilermodel" id="boilermodel" class="addjobmenudrop">
            <option value="">Select.....</option>
            <% WHILE (NOT models.EOF) %>
                <option value="<%=models.Fields("model").value %>"><%=models.Fields("model").value %></option>
            <% models.movenext()
            Wend %>
        </select>       
        <br/><br/>
        <b>Installed Boiler Serial Number</b>
        <br/>
        <input type="text" name="boilerserial" id="boilerserial" maxlength="50" class="addjobmenudropmedium">
        <br/><br/>
        <b>Notes</b>
        <br/>
        <textarea name="notes" id="notes" rows="5" cols="62" maxlength="1000" class="addjobtextbox"></textarea>
        <br/><br/><br/>
        <input type="submit" value="UPDATE JOB" name="Submit" class="formbutton">
        <br/><br/><br/>
    </form>

</div>

<%
Call CloseRecordSet(heatcontrols)
Call CloseRecordSet(maincontrols)
Call CloseRecordSet(installtype)
Call CloseRecordSet(makes)
Call CloseRecordSet(models)
Call CloseDB()
%>

</body>
</html>

以下是表单的实时版本 - http://www.chenks.co.uk/form.asp

Answer 1

我还没有使用ASP编程，但我猜它的工作方式与使用PHP的方式相同：

创建一个名为＆＃34; ModelsDropdown.asp＆＃34;的新页面。使用下拉列表所需的内容：

<!--#include virtual="/includes/functions.asp"-->

<%
Call OpenDB()
Call OpenRecordSet(models, "select model from lu_model where link_to_make = url_parameter_make order by model")
%>

    <option value="">Select.....</option>
    <% WHILE (NOT models.EOF) %>
        <option value="<%=models.Fields("model").value %>"><%=models.Fields("model").value %></option>
    <% models.movenext()
    Wend %>

<%
Call CloseRecordSet(models)
Call CloseDB()
%>

如何在ASP中使用URL参数我不知道，但我希望你这样做。当你打开http://www.chenks.co.uk/ModelsDropdown.asp?make=some_make时它应该只吐出传递的make的选择选项。

现在您可以通过JavaScript / Ajax获取此内容并将其放入原始表单中：

$("#boilermake").on("change", function(){
    // Use jQuery get to call your new page with the selected make as parameter
    $.get("/ModelsDropdown.asp", {make: $("#boilermake")[0].value}, function(data){
        // paste the select options into the DOM
        $("#boilermodel").html(data);
    });
});

要在SQL查询

1 个答案: