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Showing content from https://webplatform.github.io/docs/apis/css-regions/NamedFlow/firstEmptyRegionIndex below:

firstEmptyRegionIndex · WebPlatform Docs

firstEmptyRegionIndex Summary

Returns the integer index of the first empty element within a region chain. Returns -1 if the content fits within the region chain, if it exceeds available space or if there are no regions in the region chain.

Property of apis/css-regions/NamedFlow apis/css-regions/NamedFlow

Syntax

Note: This property is read-only.

var index = flow.firstEmptyRegionIndex;

Return Value

Returns an object of type NumberNumber

Examples

trimRegions('mainFlow');


function trimRegions(flowName) {
    var flow = document.getNamedFlows().namedItem(flowName);
    var index = flow.firstEmptyRegionIndex;
    var regions = flow.getRegions();
    if (index == -1) return(false); 
    
    for (var i = index; i &lt; regions.length; i++) {
        regions[i].parentNode.removeChild(regions[i]);
    }
    return(true);
}

Usage

 The firstEmptyRegionIndex is the index of the first

region within the flow’s getRegions() collection whose regionOverset is empty. If all are set to fit or overset, or if no regions are associated with the flow, the firstEmptyRegionIndex returns -1.

Related specifications

CSS Regions Module Level 1: W3C Working Draft