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Window.alert cannot be launched after making an ajax call

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I am trying to display a status after making an ajax call, the following is the code fragment.

submitButton.addClickHandler(new ClickHandler() {

public void onClick(ClickEvent event) {
// TODO Auto-generated method stub;
for(int i = 0 ; i < ageBoxes.length ; i++) {
ageBoxes[i].validate(); //ajax call



submitButton is a button. ageBoxes is an array of TextBox. When the submit button is clicked, this click handler will be triggered and make ajax call(validate) for all the TextBox. The ajax call can be triggered successfully, however, the Window message box cannot be launched for some reasons.

Can anyone give me ideas why the message box cannot be popped up after making a series of ajax call?

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Do you get any errors? Did you try running in a debugger? Did you try using printf statements before and after the Window.alert call?
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