Find Elements

Brief

All the APIs of Rize just support the first element which matched the CSS selector you gave. However, sometimes you may want to find non-first-matched element, just like calling document.querySelectorAll.

Rize provides three special methods to let you find elements, even by XPath, if you like. These three methods are find, findAll and findByXPath.

The find method just find the first element which matched the CSS selector, whose behavior is like document.querySelector. So most of time you may not need to use this method.

The findAll method does as document.querySelectorAll, but it doesn't return an array of elements. In fact, you should specify the index of the element you want to operate. The findByXPath method does the same thing and the difference between findAll and findByXPath is the former use CSS selector while the latter use XPath.

All the examples and documentation below will use findAll. As the usage of findByXPath is same as findAll. (Just replace the CSS selector with XPath.)

Signature of those methods

The first parameter

The first parameter of findAll method is CSS selector while the first parameter of findByXPath is an XPath expression. So Rize will find elements according to the CSS selector or XPath expression you gave.

The second parameter

The second parameter of those two methods is index. You must specify the index of the element you want in the array of elements.

The third parameter

The third parameter of those two methods is a function. You can pass Rize APIs here, but not all APIs work.

That function must have no more than three parameters. If you have a function which has more than three parameters, please refactor it or write another function to wrap it. (Too many parameters in one function is not a good practice.)

Besides, the first parameter of that function must receive a string as a valid CSS selector.

The rest parameters

All the rest parameters will be passes as arguments to the third parameter (which is a function).

Examples

Here are some examples:

const rize = new Rize()
rize.findAll('div', 0, rize.assertVisible)
rize.findAll('div', 1, rize.assertClassHas, 'my-class')

The example above are valid, because the method assertVisible and assertClassHas receive a string as CSS selector in their first parameter.

However, the example below are invalid:

// Don't do like this!
const rize = new Rize()
rize.findAll('div', 0, rize.assertTitle)

Though the first parameter of assertTitle receive a string, it is not regarded as CSS selector.

As a matter of fact, you can pass a custom function not only Rize's APIs.

(async () => {
  const rize = new Rize()
  const value = await rize.findAll(
    'input',
    0,
    selector => rize.evaluate(
      s => document.querySelector(s).value,
      selector
    )
  )
})()

You may concern about what is the return value of find, findAll and findByXPath method. Honestly, it is determined by the function you passed as the third parameter.

Last Updated: 8/23/2018, 2:22:32 AM