The specific implementation method of using jquery to access photos_jquery

1. Use jquery to call the function in aspx:

Copy the code The code is as follows:

sajax("***.aspx/DoSave", //A URL address, pointing to the ASPX where the function is located
　null,//Parameters, the parameters required by the pointed ASPX function
showSaveResult);/ /jS script executed after successful execution

2. Function sajax

Copy code The code is as follows:

function sajax(url, data, successcallback)
{
$.ajax({ : data,  
　async: false,  
　contentType: "application/json;charset=utf-8",  
　dataType: "json",  
 success: successcallback,  
ode: {                 
404: function () { alert('page not found'); },
500: function () { alert('Internal server error');                                                                                           > };



3. Background function:
cs code

Copy code

The code is as follows: [WebMethod(EnableSession = true)] //AJAX call must be a function declared in this way EnableSession--》Use Session to access photospublic static void DoSave (){ byte[] byZhaoPian; byZhaoPian = (byte[])(HttpContext.Current. Session["image"]);                                                   🎜>catch                                                                                  >

4. How to assign value to Session["image"]

After selecting the photo, when you click OK to upload, convert the image into binary and assign it to Session["image"]

5. The method of uploading photos will not be written here, please check other articles