What is the difference between script tag, and “<%…%>” tag?

Question

I have just started to work on web applications, and learning to use ASP.Net. I have come across two methods to add script in an HTML page. One is by using script tag, and other one is by using <% ... %> tag. But, I am unable to figure out, what is the difference between both, and which one should I prefer in which case?

Answer 1

脚本标记用于指定完整脚本（通常是完整的方法/功能）（主要是客户端脚本，但您也可以使用服务器端脚本块），而<% ... %>用于包括服务器端内联片段。

Answer 2

The tag can be JavaScript or the language in question. The <% %> is functionally equivalent to

<script language="C#|vb" runat="server">

In general, you put the code in code behind (win forms), so the only is for client side script (generally JavaScript). With ASP.NET MVC, the <% %> is for marking up the view and is not really code.

Answer 3

<% %>用于asp.net编码，<script>标签可以用于任何语言，通过指定您要使用的语言，例如这个用于javascript的<script type="text/javascript">

Answer 4

Script tags are used to add Javascript (or similar) script to the final HTML which is rendered by the browser, and hence allow client-side scripting.

<% ... %> tags are ASP tags that are processed on the server side, and will not be present in the rendered HTML.

Answer 5

What do you mean by script tag?

<script language="C#" runat="server">
...
</script>

this is used when you specify that you do not want to place the server code in a separated file, such as myFile.aspx.cs or in VB myFile.aspx.vb , this will be the code to run before the page is rendered and will act in compliance with the ASP.NET Page Events Cycle.

The tags <% %> are used to place Server Code in your page , just like plain old Classic ASP.

Normally we use as Response.Write using <%= ... %> but if you use Resources Files, you will end up using <%$ ResourceFile.Variable %> as well

It's a mean to inject server code into the page

Answer 6

the script tag indicates where client script is going to be executed or if in a function where it is to be organized. The <% .. %> is code that is executed on the webserver and is never seen by the client.

<script>
   window.alert("hi") // This will popup a hi message
</script>
<% responce.wrtie("hi") %> 

When you load this page you would see a popup and the text hi however in the page source you would see

<script>
   window.alert("hi") // This will popup a hi message
</script>
hi

Answer 7

Particularly in case of ASP.net

Code inside script tag is directly placed directly under the class that is generated by the asp.net when the aspx page is requested.

(Every time a request is made to .aspx page , the page is parsed into a .cs file whose path can be found out by using <%=GetType().Assembly.Location%>.And also you have to set the Debug=true in the page directive.)

Code inside <% %> is placed inside a method in the generated class file. For example you can not write Response.Write() directly inside the script tag as it needs to be written inside a method.

Hope this helps.