onBeforeLightbox

fires immediately before the user opens the lightbox (edit form)

id

string|number

the task id

boolean

defines whether the default action of the event will be triggered (true) or canceled (false)

Example

gantt.attachEvent("onBeforeLightbox", function(id) {
    const task = gantt.getTask(id);
    task.my_template = `<span id='title1'>Holders: </span>${task.users}
    <span id='title2'>Progress: </span>${task.progress*100}%`;
    return true;
});

Related samples

• The event is blockable. Return false to cancel the default processing (opening of the lightbox).
• Using this event is a good way to customize something in the lightbox.

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