I want to make sure gradient colour of text is kept, even though I have put the text on circle object, but I get the result like this

As you can see,when I put the text it on circle object, the text colour changed to first colour of gradient, and when I checked it, the gradient node being left  in place of text object before I put it on circle object.

I wonder how to keep gradient colour of text?

Edit : Is it possible to do it? If not, please tell me cause I'm curious about it. 

See that line with a square, some diamonds and a circle that appears when you select the text tool? That's your gradient. You'll have to move it to the text's new location.

For a gradient to follow the arc, is a little more complicated, but can be done. https://www.youtube.com/watch?v=RoIEZBXO0eQ

For that to work on text I guess you would have to do it with circles larger than the letters first, then use the text as a clip path.

@bleke Is this what you mean? But it is weird cause only text showed up and not the circle

@TylerDurden I have tried your solution but it seems it doesn't work, just like in this image

Here's a simpler method that might meet your needs. Use your text to clip a gradient-filled object.

The colouring complexity is limited only by your imagination. Here's a slightly more interesting version using groups and clones. It doesn't render properly in my browser (Safari) but works well in Inkscape. 

@Paddy_CAD Thanks bro, I get it now what @bleke mean is this right?

Thank you guys for answering my silly question

@earvinwilliams96 I made a couple of videos for you:

https://youtu.be/3TlJ2H8cxMY

https://youtu.be/a7nvdAA9-x0

Here is the more complicated way... the gradient follows the arc. 

@TylerDurden We must have made the same thing simultaneously. :)

@TylerDurden What is the union for though?

Union converts text to path.

Ok. But that isn't necessary for the clip, in case one would want to edit the text later.

Ah, I see... I'm used to the old ways that required the clipping object to be a path. 👍