The parameter of type '{ [key:string]:any;}' cannot be assigned a string argument

When attempting to attach a click event handler on a TypeScript file, I encountered the following error message:

Argument of type 'string' is not assignable to parameter of type '{ [key:string]:any;}

https://i.sstatic.net/ATkz0.png

The ASP.NET Web Application I am working on has jQuery 2.1.4 and jquery.TypeScript.DefinitelyTyped 3.0.4 configured.

Edit:

My TypeScript file successfully picks up the definition file:

https://i.sstatic.net/qkyRF.png

Within my JQuery.d.ts, I have the following overloads:

on(events: string, handler: (eventObject: JQueryEventObject, ...args: any[]) => any): JQuery;
on(events: string, data : any, handler: (eventObject: JQueryEventObject, ...args: any[]) => any): JQuery;
on(events: string, selector: string, handler: (eventObject: JQueryEventObject, ...eventData: any[]) => any): JQuery;
on(events: string, selector: string, data: any, handler: (eventObject: JQueryEventObject, ...eventData: any[]) => any): JQuery;
on(events: { [key: string]: any; }, selector?: string, data?: any): JQuery;
on(events: { [key: string]: any; }, data?: any): JQuery;

Seeking guidance on resolving this issue. Any help or suggestions would be greatly appreciated.

javascriptjquerytypescript

Answer №1

I encountered a similar issue where none of the proposed solutions in the responses and comments were able to resolve it for me.

It turned out that the problem lied in my eventHandler's signature lacking the type JQueryEventObject for the first argument, causing it to not apply the first overload.

https://i.sstatic.net/AMIM9.png compared to

https://i.sstatic.net/EZKb8.png

Answer №3

Based on the information provided in jquery.d.ts, here are the available typings for the on function: 

1. on(events: string, selector: string, handler: (eventObject: JQueryEventObject, ...eventData: any[]) => any): JQuery;
2. on(events: string, selector: string, data: any, handler: (eventObject: JQueryEventObject, ...eventData: any[]) => any): JQuery;
3. on(events: { [key: string]: any; }, selector?: string, data?: any): JQuery;
4. on(events: { [key: string]: any; }, data?: any): JQuery;

If you are implementing the function like this:

$(this.elementId).on("click", changeEventHandler)

Either the 3rd or the 4th typing of on will be applied, which requires the first element to be of type { [key: string]: any; }. Make sure to provide a selector to specify where the click function should be applied. Thus, you have two options:

$(this.elementId).click(changeEventHandler)
OR
$(document).on("click", this.elementId, changeEventHandler)

The key point to note is that when using the on function with the event type and handler, you must also mention the DOMElement on which the listener is to be attached.

Answer №4

This Stack Overflow thread already provides the solution:

$("#some-element").on("click", function(event:JQuery.Event) {
     // code
}

Answer №5

An error was discovered in the jquery.d.ts file where 'one' was incorrectly used instead of 'on' (refer to the image below). This issue was resolved by making the necessary correction.

https://i.sstatic.net/4tmDX.png

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