Performing multilevel verification through Puppeteer's `waitForFunction`

Utilizing the Puppeteer page.waitForFunction() method:

await page.waitForFunction(`
    (window.hero.x - 1 === ${x} || window.hero.x === ${x} || window.hero.x + 1 === ${x} || window.hero.x === ${x}) && (window.hero.y - 1 === ${y} || window.hero.y === ${y} || window.hero.y + 1 === ${y} || window.hero.y === ${y}) || window.hero.x === ${x} && window.hero.y === ${y}
`);

Although it is functional, the code appears unappealing. I am eager to convert it into a multiline format. The official documentation provides a sample snippet:

page.waitForFunction(pageFunction[, options[, ...args]])

pageFunction <function|string> Function to be evaluated in browser context

In order to pass arguments from node.js to the predicate of page.waitForFunction function:

const selector = '.foo';
await page.waitForFunction(selector => !!document.querySelector(selector), {}, selector);

I attempted the following approach:

console.log(x,y); // 24 42
await page.waitForFunction((x, y) => {
    console.log(x, y); // undefined, undefined
    if(x && y) {
        return true;
    }
});

However, the values for x and y that I intend to pass are showing as undefined. Can someone point out my mistake?

Answer №1

If you want your code to work correctly, make sure to include the arguments x and y. Additionally, consider simplifying your function like this:

await page.waitForFunction((x, y) => (x && y ? true : undefined), {}, x, y);

Answer №2

To successfully execute the waitForFunction function, make sure to provide both the x and y arguments.

console.log(x,y); // 24 42
await page.waitForFunction((x, y) => {
    console.log(x, y); // undefined, undefined
    if(x && y) {
        return true;
    }
}, {}, x, y);

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