Best method for removing CrosshairMove event listener in lightweight charts

Question

Best method for removing CrosshairMove event listener in lightweight charts

As per the documentation, using unsubscribeCrosshairMove allows us to remove a handler that was previously added with subscribeCrosshairMove. Our objective is to use unsubscribe... to eliminate previous handlers before re-subscribing with subscribe... after updating seriesData. The current code snippet seems to be having trouble properly unsubscribing, possibly due to the syntax used in subscribe... to access the event data using e. Is there a way to retain access to the event data through e while enabling proper usage of unsubscribe...? #tradingview

this.mainChart.unsubscribeCrosshairMove(this.subCrossAndSync());
this.mainChart.subscribeCrosshairMove((e) => this.subCrossAndSync(e, this.midChart, seriesData));

javascript lightweight-charts

Answer 1

Answer №1

Avoid placing the arrow function syntax directly within the subscribe method.

It is important to save a reference to the handler function that you provide to the subscribe...() method, so that you can use the same reference for the unsubscribe...() method.

There are various ways to achieve this. One approach could be to assign the handler to a variable first and then pass that variable to the subscribe method.

const eventHandler = (e) => {
 console.log('Event triggered:', e);
};
chart.subscribeEvent(eventHandler);
chart.unsubscribeEvent(eventHandler);

Here is an example link: https://jsfiddle.net/msilverwood/20oser5f/

Answer 2

Avoid placing the arrow function syntax directly within the subscribe method.

It is important to save a reference to the handler function that you provide to the subscribe...() method, so that you can use the same reference for the unsubscribe...() method.

There are various ways to achieve this. One approach could be to assign the handler to a variable first and then pass that variable to the subscribe method.

const eventHandler = (e) => {
 console.log('Event triggered:', e);
};
chart.subscribeEvent(eventHandler);
chart.unsubscribeEvent(eventHandler);

Here is an example link: https://jsfiddle.net/msilverwood/20oser5f/

Best method for removing CrosshairMove event listener in lightweight charts

Answer №1

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