WebThis doesn't work due to the following error: main.js:23 Uncaught TypeError: Cannot read property 'currentTarget' of undefined. The line it's failing on is: evt.currentTarget.className += " active"; I think the reason for this is by the time the function attempts to attach the listener, event variable is already out of scope. WebSep 4, 2024 · Try this way of looping over NodeList, your querySelectorAll returns NodeList not Array, for (const button of buttons) { button.addEventListener ('click', () => { console.log ("clicked :)"); }); } No it is not different at all. You can loop over a nodelist using normal for loops, while loops and anything else using length.
Cannot read property
WebDec 13, 2024 · The error I'm getting is getLocations err TypeError: Cannot read property 'createEvent' of undefined. The line given on the bottom of the callstack is the this.setState ( {locations: json.value}); and logging this shows me the instance of the react component as expected. Can anyone help me with this? Tech: react 16.2.0 jest 21.2.1 WebAug 27, 2016 · This is caused because of the way that javascript handles the contexts of functions, basically when calling functions if you are not calling them directly from the object, and they are not bound they will not have a defined context, and since you are passing the function as a parameter to the input component, it loses the context. crystal head vodka logo
Vue使用this.$refs.子组件ref. 方法 报错:Cannot read property ‘方法名‘ of undefined ...
WebFirst you should make sure that the subscribers have been configured and then fire the event. Oh,I see when i use r = v (); i fired my own event then i handled by my .on event handler. Yes, that was exactly one of the 2 problems with your original code. r is undefined, since v isn't returning anything. WebSep 17, 2024 · Based on the error message it looks like there's no http object in requestContext, that's why it's failing to access the method property on it. Taking a quick look at Set up Lambda proxy integrations in API Gateway we can notice the requestContext object is defined as: WebMay 8, 2024 · onClick: (event, array) => {this.timeSlotEdit (event, array)}, Another way is to keep it the way you had it before, but change the timeSlotEdit to this: timeSlotEdit = (event, array) => { } this is particularly useful for unbinding events, because you can use the function reference to remove the event listener. Share Improve this answer Follow dwg jhin spotlight