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errorMitigation()

Automatically attempt to detect and mitigate fixable errors that occur such as broken images.

JavaScript February 21, 2021

Usage

This function runs automatically, so it is not called manually. Is this incorrect?

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    Source File

    Located in /assets/js/modules/utilities.js on line 176.

    No Hooks

    This function does not have any filters or actions available. Request one?
    JavaScript
    nebula.errorMitigation = function(){
        //Try to fall back to .png on .svg errors. Else log the broken image.
        let brokenImageCount = 0;
        jQuery('img').on('error', async function(){
            brokenImageCount++; // Increment broken image counter
    
            if ( brokenImageCount >= 5 ){
                return; //Stop fetching after a certain amount of broken images
            }
    
            await nebula.yield();
    
            let thisImage = jQuery(this);
            let imagePath = thisImage.attr('src');
            if ( imagePath.split('.').pop() === 'svg' ){
                let fallbackPNG = imagePath.replace('.svg', '.png');
    
                fetch(fallbackPNG, {
                    method: 'GET',
                    priority: 'low',
                }).then(function(response){
                    if ( response.ok ){
                        thisImage.prop('src', fallbackPNG);
                        thisImage.removeClass('svg');
                    }
                }).catch(function(error){
                    gtag('event', 'Exception', {
                        message: '(JS) Broken Image: ' + imagePath,
                        fatal: false
                    });
                    nebula.crm?.('event', 'Broken Image'); //May not be defined if analytics is not active so using optional chaining on the execution of this function
                });
            } else {
                gtag('event', 'Exception', {
                    message: '(JS) Broken Image: ' + imagePath,
                    fatal: false
                });
                nebula.crm?.('event', 'Broken Image'); //May not be defined if analytics is not active so using optional chaining on the execution of this function
            }
        });
    };
    

    Override

    To override or disable this JavaScript function, simply redeclare it with the exact same function name. Remember: Some functionality is conditionally loaded via dynamic imports, so if your function is not overriding properly, try listening for a DOM event (described below).

    JavaScript

    For non-module import functions:

    nebula.errorMitigation = function(){
        //Write your own code here, leave it blank, or return false.
    }


    For dynamically imported module function overrides:

    jQuery(window).on('load', function(){
        nebula.errorMitigation = function(){
            //Write your own code here, leave it blank, or return false.
        }
    });


    Custom Nebula DOM events do also exist, so you could also try the following if the Window Load listener does not work:

    jQuery(document).on('nebula_module_loaded', function(module){
        //Note that the module variable is also available to know which module specifically was imported
        if ( typeof nebula.errorMitigation === 'function' ){
            nebula.errorMitigation = function(){
                //Write your own code here, leave it blank, or return false.
            }
    	}
    });