Strategies for managing the result of findElements?

Question

Strategies for managing the result of findElements?

Snippet A

resultsBoard.findElements(By.css(mySelector)).then(function(elements) {
  elements.forEach(function(val, idx) {
    elements[idx].getText().then(function(text) {
        console.log(text);
    });
  });
});

Snippet B

resultsBoard.findElements(By.css('mySelector')).then(function(elements) {
  for (var idx = 0; idx < elements.length; idx++) {
    elements[idx].getText().then(printText(text));
  }
});

Snippet A successfully retrieves the text of all matched elements using the provided selector. Snippet B throws a

ReferenceError: text is not defined

So what causes this discrepancy and how can it be resolved?

javascript selenium-webdriver webdriverjs

Answer 1

Answer №1

The second section introduces calling parentheses that immediately invoke the function (printText). These parentheses assume text is already defined, a feature absent in the first section.

elements[idx].getText().then(printText(text));

// can be simplified to...

var _result = printText(text);
elements[idx].getText().then(_result);

If you want to pass a named function as an argument, simply use its name as a variable:

elements[idx].getText().then(printText);

Answer 2

The second section introduces calling parentheses that immediately invoke the function (printText). These parentheses assume text is already defined, a feature absent in the first section.

elements[idx].getText().then(printText(text));

// can be simplified to...

var _result = printText(text);
elements[idx].getText().then(_result);

If you want to pass a named function as an argument, simply use its name as a variable:

elements[idx].getText().then(printText);

Answer 3

Answer №2

Let's break down the first example:

elements[idx].getText().then(function(text) {
   console.log(text);
});

In the code snippet above, the .then(function(text)) segment assigns a variable name (text) to the data retrieved from getText(). This allows you to utilize it in the subsequent line of code, which is not the case in the second example.

To ensure functionality in your second example, consider revising it as demonstrated below:

resultsBoard.findElements(By.css('mySelector')).then(function(elements) {
  for (var idx = 0; idx < elements.length; idx++) {
    elements[idx].getText().then(function(text) {
      printText(text);
    });
  }
});

Answer 4

Let's break down the first example:

elements[idx].getText().then(function(text) {
   console.log(text);
});

In the code snippet above, the .then(function(text)) segment assigns a variable name (text) to the data retrieved from getText(). This allows you to utilize it in the subsequent line of code, which is not the case in the second example.

To ensure functionality in your second example, consider revising it as demonstrated below:

resultsBoard.findElements(By.css('mySelector')).then(function(elements) {
  for (var idx = 0; idx < elements.length; idx++) {
    elements[idx].getText().then(function(text) {
      printText(text);
    });
  }
});

Strategies for managing the result of findElements?

Answer №1

Answer №2

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