![](/img/trans.png)
[英]HTML dropdown can't capture onChange() if there is only one value in dropdown
[英]HTML dropdown onChange value to be used in SQL query
我有一个Web表单(我认为是HTML5兼容!),它使用带有VBScript的Classic ASP和一些免费文本字段,一个日期选择器和一些下拉菜单,这些下拉菜单从各种SQL查询中提取。 (这是用于测试此问题的表格的精简基本版本。)
下拉菜单之一需要显示取决于上一个下拉菜单中的选择的选项。
我能够使用javascript onChange来获取所选选项并将其显示在页面上(这是当前get_boiler脚本的功能,但是我无法弄清楚如何在用于显示所需选项的查询中使用该选项。
OnChange捕获值的下拉列表为“ Installed Boiler Make”,并将将该值用作SQL查询一部分的下拉列表为“ Installed Boiler Model”
我考虑过将值作为查询字符串推出并重新加载表单,但是随后我丢失了所有先前输入的值,这不是理想的结果。
谁能指出我正确的方向? 需要使用所选值的查询是称为“模型”的记录集。 我放了??? 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。 我不是在找人为我做工作,只是为我指明了正确的方向。 对于这个问题,我在Stackoverflow上看起来很不错,但是没有找到任何试图做同样事情的问题。
<!--#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>
这是该表格的实时版本-http: //www.chenks.co.uk/form.asp
我还没有使用ASP编程,但是我想它的工作方式与使用PHP的方式相同:
创建一个名为“ ModelsDropdown.asp”的新页面,其中包含下拉菜单所需的内容:
<!--#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()
%>
我不知道如何在ASP中使用URL参数,但希望您能这样做。 当您打开http://www.chenks.co.uk/ModelsDropdown.asp?make=some_make时,它应该只吐出所传递品牌的选择选项。
现在,您可以获取此内容并将其通过JavaScript / Ajax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);
});
});
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.