分割数组

引言

这段代码将帮助你通过表单存储复选框或单选按钮的值（用于在屏幕上渲染/存储在数据库中）。如果你在表单中有很多具有相同名称的复选框/单选按钮，并将它们传递回表单，这将非常有用。或者，如果你想将变量的所有值在一个数据字段中添加到数据库中。

这段代码将展示如何使用 ASP 的 SPLIT() 函数。

SPLIT() 函数在你需要在单个变量中保存多个项目时非常有用。然后，你可以简单地使用 SPLIT() 函数来分解该变量，从而构建一个数组。请参阅示例代码

如有任何问题，请随时向我提问。

Using the Code

<%
'First declare a variable [myVariable]

'It contains 3 values each of these are seperated

'by a comma , (you may use any seperator)

myVariable = "myValue1, myValue2, myValue3"

'Make an array to store and break the variable

'[Split] function do that work

myArray = Split(myVariable,",")

'now we can see logically our Variable have been broken 

'into 3 parts as an Array 

'something like: 

'*************** 

'Logical Diagram 

'***************

'  ------------------------

'  |  myArray   | Value    |

'  ------------------------

'  |    0       | myValue1 |

'  |    1       | myValue2 |

'  |    2       | myValue3 |

'  ------------------------

'Split function brokes variable and makes Array

'Array always start from 0 (zero) to last number

'Now we need a loop to render array on screen

For i = LBound(myArray) TO UBound(myArray)
   Response.Write myArray(i) & "<BR />"
Next

'run this code you will see the result


'what going on to the above line?

'See the following example. 

Loop was running 3 times, each times value for i= changed, read below...

'First Time Loop (view logical diagram)

-------------
'For i = 0

   'Response.Write myArray(0) it's equal to [myValue1]

'Next

-------------

 
'Second Time Loop (view logical diagram)

-------------
'For i = 1

   'Response.Write myArray(1) it's equal to [myValue2]

'Next

------------- 

'Third Time Loop (view logical diagram)

-------------
'For i = 2

   'Response.Write myArray(2) it's equal to [myValue3]

'Next

------------- 

'so it will loop thrice and array values will be print out on the screen

%>

我们如何从上面的示例中受益？

我们可以将此变量设置为我们的 Request.QueryString 或 Request.Form

'example

'myVariable = "myValue1, myValue2, myValue3"

将代码用作 QueryString

myVariable = Request.QueryString ("itemName")

或将代码用作 Form 集合

myVariable = Request.Form ("itemName")

如果请求使用不同的值但具有相同的变量，那么这个脚本就能派上用场……

现在，我们应该创建一个 Form

<form action="mypage.asp">
my hobbies:

<input type="radio" name="hobby" value="martial arts" /> Martial Arts <br />
<input type="radio" name="hobby" value="programming" /> Programming <br />
<input type="radio" name="hobby" value="books" /> books <br />

<input type="submit" value="Go!" />
</form>

理解了吗？按下提交后，表单将发送如下爱好：

mypage.asp?hobby=martial arts&hobby=programming&hobby=books

所以，我们需要创建三个变量来捕获 Request 的三个值吗？当然不需要。所以，我们将全部捕获到一个变量中

Dim hobby
hobby = Request.QueryString ("hobby")
'now, if we will print above variable on the screen it will display the result as:


Response.Write hobby

'Screen Result will be  as =>>>   martialarts,programming,books

现在，我们如何从一个变量中提取文本？SPLIT() 函数就是解决方案：轻松地使用 SPLIT() 函数。创建一个数组来存储和分解变量。

'[Split] function do that work

hobby = Split(Request.QueryString("hobby"), ",") 

SPLIT 函数接受两个参数

• SPLIT (变量名，用哪个字符来分解变量)

所以，我们只需传递查询字符串，然后放置“,”。SPLIT() 将通过切分“,”将变量分解为数组。

变量转换为数组如下：

hobby(0) = "martial arts"
hobby(1) = "programming"
hobby(2) = "books"

现在，打印这些值不再有问题

For i = LBound(hobby) TO UBound(hobby)
   Response.Write hobby(i) & "<BR />"
Next

此外，你还可以轻松地将值添加到数据库中，希望如此。

玩得开心：)