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https://issues.apache.org/jira/browse/WICKET-2940?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12964589#action_12964589
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Andera Del Bene commented on WICKET-2940:
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Hi.
To avoid this side effect we could use css class 'wicket-ajax-indicator'
associated with AJAX indicator's span. Setting property 'position' to
'absolute' takes indicator out of the normal flow of the document, avoiding any
layout problem.
> Placeholder image for AJAX indicator in IndicatingAjaxButton
> ------------------------------------------------------------
>
> Key: WICKET-2940
> URL: https://issues.apache.org/jira/browse/WICKET-2940
> Project: Wicket
> Issue Type: Improvement
> Components: wicket
> Affects Versions: 1.4.9
> Reporter: Pierre Wargnier
> Priority: Minor
>
> The current IndicatingAjaxButton has a indicator that is set visible when
> AJAX is running. This usually breaks the HTML. A solution given by other
> frameworks like RichFaces is to have a "blank image" of the same size that is
> visible when AJAX is not running. This function can be optional because it
> adds mode HTML.
> I managed to implement this (but the original Wicket AJAX author will find
> cleaner ways to do it):
> 1) I overloaded AjaxIndicatorAppender.onRendered to add another <span> with
> the blank image. The ID is the same as the indicator + "blank".
> 2) I created interface IAjaxIndicatorAware2 extending IAjaxIndicatorAware and
> I made a IndicatingAjaxButton implementing this interface.
> 3) I modified AjaxButton.generateCallbackScript like this:
> On line 157:
> boolean blankIndicator = getComponent() instanceof IAjaxIndicatorAware2; //to
> test if the component has a placeholder
> One line 169:
> if(blankIndicator){
> hide += "wicketShow('" + indicatorId +
> IAjaxIndicatorAware2.BLANK_SUFFIX + "');";
> }
> On line 213:
> StringBuilder sb = new
> StringBuilder("wicketShow('").append(indicatorId).append("');");
> if(blankIndicator){
>
> sb.append("wicketHide('").append(indicatorId).append(IAjaxIndicatorAware2.BLANK_SUFFIX).append("');");
> }
> sb.append(call);
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