Resource file exist

1

how to check if one the resource file (ie image file) exist in the Images folder?

Thanks
Teo

2

Can you explain some more?

3

i want to display a product image file into a grid. Normally, the image files will be downloaded from a website into device upon app running. However, I would like to check an image is already existed in app images folder. I will display a default image(noimage.png) if the related image file not being downloaded (image file not exists) yet.
similar function in VB, FileSystem.FileExists(path)

Thanks
Teo

4

How are you displaying the images?

5 
img="Image\test.png"
if not fileexists(img)  then img="Image\noimage.png"
grid1.setvalue(1,1,"<img scr='" & img & "'>")

but fileexists is not a function

Thanks
Teo

6

You could try

if img = "null" or img = "undefined" then 
img="Image\noimage.png"

Some more info: How do I check if file exists in jQuery or pure JavaScript? - Stack Overflow

7

img=“null” or “undefined” is not working since img is a string

my solution

img="Images\test.png"
grid1.setvalue(i,0,"<img src='" & img & "' height=80 width=80 name='imginv_" & i & "_1' id='imginv_" & i & "_1' onerror='imgError(this)'>")

function imgError(obj)
  If IsNull(obj) Then Exit Function
  s=Split(obj.name,"_")
  img="Images\noimage.png"
  grid1.setvalue(s(1),0,"<img src='" & img & "' height=80 width=80 name='imginv_" & s(1) & "_1' id='imginv_" & s(1) & "_1'>")
end function