How to access Cache images loaded Serverside and retrieved on Client

Question

I have server side code that retrieved images from table and stores them in a Dictionary array and in Cache memory like:

Cache("files") = New Dictionary(Of String, String)()

The 'Of string' key is identity number of image to add and the String() value contain the corresponding image in Base64string format.

I now would like to be able to retrieve a particular image from the Cache Dictionary array by passing ID number to javascript function and load that image in a image element on page from client.

Answer 1

Hi @peter liles ,
Where are you currently having problems?
If you want to use javascript to get the value of the backend, you can try the following method.
1.Create a property in your code behind

protected string MyProperty { get { return "your value"; } }  

then in javascript

var myValue = "<%= MyProperty %>";  

2.You can use an ASP.Net HiddenField. You just set its value on the server and retrieve it via javascript when you need it.
Serverside

hdf_Test.Value = "yourValue";  

HTML

<asp:HiddenField runat="server" ID="hdf_Test" />  

Javascript

document.getElementById('hdf_Test').value  

3.Retrieve the value with an AJAX request.

Best regards,
Lan Huang

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