What is the best way to generate a dynamically interpolated string in JavaScript?

I'm currently developing a reusable UI component and am exploring options to allow the user of this component to provide their own template for a specific section within it.

Utilizing TypeScript, I have been experimenting with string interpolation as a potential solution. Here is my progress so far:

export class Pager {
    pageNumber: number = 1;

    getButtonHtml(buttonContentTemplate?: string, isDisabled?: boolean): string {
        buttonContentTemlpate = buttonContentTemplate || '${this.pageNumber}';
        isDisabled = isDisabled || false;
        return `<button id="button-id" type="button"  ${!isDisabled ? '' : disabledAttribute}>
                    ${buttonContentTemplate}
                </button>`;
    }
}

While I have additional methods in place to update the page number based on user input/interaction, my goal is for getButtonHtml to return 

<button id="button-id" type="button">1</button>
when called. Unfortunately, it currently returns 
<button id="button-id" type="button">${this.pageNumber}</button>
.

I am curious if there is a method to prompt JavaScript to reevaluate the string and interpolate the remaining placeholders?

After reviewing the MDN article on this matter, I suspect that utilizing the String.raw method may provide a solution. However, despite various attempts, I have yet to achieve success.

Any assistance or guidance on this matter would be highly appreciated.

javascripttypescriptecmascript-6string-interpolation

Answer №1

One issue is that Template literals are immediately interpreted.

To resolve this, consider lazy loading the template by passing in a function that returns a string instead.

export class Pager {
    pageNumber: number = 1;

    getButtonHtml(template?: () => string, isDisabled=false): string {
        template = template || function() { return this.pageNumber.toString() };
        return `<button id="button-id" type="button"  ${!isDisabled ? '' : disabledAttribute}>
                    ${template()}
                </button>`;
    }
}

Furthermore, default parameters can be utilized to avoid using the || operator workaround.

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