[英]How to mix C# with javascript for changing html?
I'm trying to change a html DOM element. 我正在尝试更改html DOM元素。 With data from asp.net.
来自asp.net的数据。 All the data from CSharp is in the ViewBags.
来自CSharp的所有数据都在ViewBags中。 ViewBag.Kenmerken is a list of Strings and ViewBag.Definities is a list a definition object with a variable 'variabel' and the variable 'kenmerk'.
ViewBag.Kenmerken是字符串的列表,而ViewBag.Definities是具有变量'variabel'和变量'kenmerk'的定义对象的列表。 I have the following code:
我有以下代码:
@{
ViewBag.Title = "KenmerkSelectie";
}
<script type="text/javascript">
function Kenmerk1() {
var myselect = document.getElementById("kenmerk1");
var selectValue = myselect.options[myselect.selectedIndex].value;
var newOptions= "";
@foreach (var def in ViewBag.Definities) {
//@def.kenmerk is C# && selectValue is JS;
if(@def.Kenmerk == selectValue){
newOpstions= newOptions+ "<option value=\"@def.Variabel\"> @def.Variabel </option>";
}
}
document.getElementById("var1").innerHTML = newOptions;
}
<div class="kenmerk">
<h3>Kenmerk 1</h3>
<select id="kenmerk1" onchange="Kenmerk1()">
@foreach (var item in ViewBag.Kenmerken)
{
<option value="@item">
@item
</option>
}
</select>
<select id="var1" multiple="multiple">
<!-- add option from js function -->
</select>
</div>
EDIT: 编辑:
Description: An error occurred during the compilation of a resource required to service this request.
说明:编译服务于此请求所需的资源期间发生错误。 Please review the following specific error details and modify your source code appropriately.
请查看以下特定的错误详细信息,并适当地修改您的源代码。
Compiler Error Message: CS0103: The name 'selectValue' does not exist in the current context
编译器错误消息:CS0103:当前上下文中不存在名称“ selectValue”
Source Error: if(@def.Kenmerk == selectValue){
源错误:if(@ def.Kenmerk == selectValue){
You aren't properly escaping your "
(quotations). This line: 您没有正确转义
"
(引号)。此行:
newOptions = newOptions + "<option value="@def.Variabel"> @def.Variabel </option>";
Should be something like: 应该是这样的:
newOptions = newOptions + @"<option value=""@def.Variabel""> @def.Variabel</option>";
Though, for ASP.NET MVC design principles, I'd recommend not using the ViewBag. 但是,对于ASP.NET MVC设计原则,我建议不要使用ViewBag。 Use a model for passing in your data instead.
请改用模型传递数据。 http://tech.trailmax.info/2013/12/asp-net-mvc-viewbag-is-bad/
http://tech.trailmax.info/2013/12/asp-net-mvc-viewbag-is-bad/
EDIT: Also, it looks like you should convert your data to JSON so that you can compare your values on the JavaScript side. 编辑:而且,看起来您应该将数据转换为JSON,以便可以在JavaScript端比较值。 Since
def.Kenmerk
lives in C#, it won't be able to evaluate the JavaScript variable, selectValue
on an ==
comparison. 由于
def.Kenmerk
在C#中,因此无法在==
比较中评估JavaScript变量selectValue
。
Try using razors <text>
Pseudo-element see also here 尝试使用剃须刀
<text>
伪元素另请参见此处
function Kenmerk1() {
var myselect = document.getElementById("kenmerk1");
var selectValue = myselect.options[myselect.selectedIndex].value;
var newOptionsInHtmlStyle = "";
@foreach (var def in ViewBag.Definities) {
<text>
//@def.kenmerk is C# && selectValue is JS;
if(@(def.Kenmerk) == selectValue){
newOptions = newOptions + '<option value="@(def.Variabel)"> @(def.Variabel) </option>';
}
</text>
}
document.getElementById("var1").innerHTML = newOptions;
}
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