how to make button unclickable when textbox is empty or no text or white space?

[Xiaomy Redmii]

I have 

*1 button

*1 textbox

I don't know how to make that button unable to click if the text box is still no text

thank you :)

[Taifun]

set the button to enabled = false from the beginning

and by using the textbox extension https://puravidaapps.com/textbox.php and its AfterTextChanged event you could set the button to enabled = true in case some valid text has been entered

Taifun

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Trying to push the limits of App Inventor! Snippets, Tutorials and Extensions from Pura Vida Apps by Taifun.        

[Xiaomy Redmii]

good morning sir :)
do I need to check the suppress warning?

what is the purpose of get component?
I already set the button to true aftertextchanged but whenever I type on the text 
the button is still disabled

[Taifun]

It would really help if you provided a screenshot of your relevant blocks, so we can see what you are trying to do, and where the problem may be.

[Xiaomy Redmii]

I deleted it because none works

I did 

screen.Initialize

set button1.visible to false

*taifun.textbox

aftertext.changed

if get component = textbox 1

set button1 = true

[Taifun]

you might want to try it again and provide a sceenshot in case you get issues

also don't forget to start the listener... you might want to read the documentation of the textbox extension

Taifun

[ABG]

Here's an example from a recent project, 

where I had to disable a Save Button for a mileage text box until

it held a bigger number than another text box

with a previous value.

The trick was to use a repeating Clock Timer to check if the

.Text contents were okay and set the button .Enable on that basis.

It is up to you to decide what okay means, some

combination of the is a ... blocks.

ABG

[Xiaomy Redmii]

[Taifun]

as far as I can see your screenshot looks fine

you did not say anything.. ist this your working solution or do you still have issues?

Taifun

[Xiaomy Redmii]

I tried this block

whenever I type on the textbox
the button is activate
but when the text is clear the the button is not disabled

I don't know why

maybe I need your enterpressed?

I want to disable the buttons once the textboxes are empty again

[BodyMindPower]

Maybe you are looking for something like that:

Anke

[Taifun]

but when the text is clear the the button is not disabled

which means, you have to adjust the AfterTextChanged event to consider this...

note: in programming nothing works automatically...

Taifun

[Xiaomy Redmii]

good morning sir :)

I will try that 
do I need to use the time?

sir how about a WHITE SPACE or other character ?

I added TRIM after Is Empty!
thank you so much :) I got it working

I also learned from this post taifun https://groups.google.com/forum/#!topic/mitappinventortest/3-uRpY6g74Q

thank you so much guys

[BodyMindPower]

You should also disable the timer when it is not needed, otherwise it will always fire.

e.g. like this:

or you do not need to enable it again:

Anke

[Xiaomy Redmii]

yeah it always fire during the test / ai2 companion

I choose the lost_focus

thank you sir

[Xiaomy Redmii]

sir can I use both?

[Taifun]

you might want to choose one of the options, else it would be redundant

and if you have 2 options to solve something, you might think about which solution needs less blocks to get what you want...

Taifun

[Xiaomy Redmii]

good morning sir 

I used both

my app works great

sir can I make 500 (in clock) like 100? so my problem whenever the user type on keyboard's phone can't bypass the button?

currently once the user type (white space   = I already put "trim") and click (fast) the button the notifier still pop up

[BodyMindPower]

sir can I make 500 (in clock) like 100?

of course, but you should use only one option, as Taifun said

Anke