Javascript 通过javascript从后面的代码访问变量
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Access variable from code behind via javascript
提问by Narazana
I have the following code that I want to return to a variable "t" in javascript:
我有以下代码要返回到 javascript 中的变量“t”：
Code behind:
后面的代码：
Public Shared Function GetSomeText() As String
Dim result = "This is from code behind"
Return result
End Function
Caller variable in javascript:
javascript中的调用者变量：
//This is not working like that, I think
var t = GetSomeText();
So, how can I make variable "t" get the "result" from Function GetSomeText from code-behind?
那么，如何让变量“t”从代码隐藏的函数 GetSomeText 中获取“结果”？
Thank you.
谢谢你。
回答by tvanfosson
Try this -- assuming that this a public method on the page. This will call the method GetSomeText() on the page class and then do a Response.Write() of the data to the page as it's being rendered. The result should end up between the single quotes in your javascript.
试试这个——假设这是页面上的公共方法。这将调用页面类上的 GetSomeText() 方法，然后在呈现页面时对页面执行 Response.Write() 数据。结果应该在 javascript 中的单引号之间结束。
var t = '<%= GetSomeText() %>';
回答by SLaks
You need to write the string to a Javascript variable in server-side code, like this: (In a <script>block in the ASPX page)
您需要将字符串写入服务器端代码中的 Javascript 变量，如下所示：（在<script>ASPX 页面中的一个块中）
var t = "<%= GetSomeText() %>";
Note that you mustcorrectly escape it, like this: (Or using the AntiXSS Toolkit
请注意，您必须正确转义它，如下所示：（或使用AntiXSS Toolkit
public static void QuoteString(this string value, StringBuilder b) {
if (String.IsNullOrEmpty(value))
return "";
var b = new StringBuilder();
int startIndex = 0;
int count = 0;
for (int i = 0; i < value.Length; i++) {
char c = value[i];
// Append the unhandled characters (that do not require special treament)
// to the string builder when special characters are detected.
if (c == '\r' || c == '\t' || c == '\"' || c == '\'' || c == '<' || c == '>' ||
c == '\' || c == '\n' || c == '\b' || c == '\f' || c < ' ') {
if (b == null) {
b = new StringBuilder(value.Length + 5);
}
if (count > 0) {
b.Append(value, startIndex, count);
}
startIndex = i + 1;
count = 0;
}
switch (c) {
case '\r':
b.Append("\r");
break;
case '\t':
b.Append("\t");
break;
case '\"':
b.Append("\\"");
break;
case '\':
b.Append("\\");
break;
case '\n':
b.Append("\n");
break;
case '\b':
b.Append("\b");
break;
case '\f':
b.Append("\f");
break;
case '\'':
case '>':
case '<':
AppendCharAsUnicode(b, c);
break;
default:
if (c < ' ') {
AppendCharAsUnicode(b, c);
} else {
count++;
}
break;
}
}
if (b == null) {
b.Append(value);
}
if (count > 0) {
b.Append(value, startIndex, count);
}
return b.ToString();
}
