Description  | 
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Show a loading mask to avoid the user click on any control  | 
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Parameters  | 
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boolean  | 
Activate o DeActivate the loading mask  | 
Return  | 
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No return value  | 
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Example  | 
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<a href="#" onclick="loading_example()">Click here</a> to display the loading mask for 5 seconds 
 Preview: In the preview of the example you can see the result of the string: By clicking the link in the "Click here to display the loading mask for 5 seconds" message, the app displays the loading mask for 5 seconds.  | 
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