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I would like to find out the length of the variable which I get from the screen. If I use 

var driverID = element(by.id('driverID')).getAttribute('value') 
driverID.length

it is throwing and error as Property 'length' does not exist on type'Promise <string>. Can some one help me in finding the length of the string.

I would also like to know how to use string operations in protractor tests. In this case I want to know, if the string first index is 'character or a number' and the second index is 'character or a number'. I want to do this by using the length of the string.

Vadim Kotov
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VonNet
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2 Answers2

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try that:

var driverID = element(by.id('driverID')).getAttribute('value');
driverID.then((attribute) => {
    console.log(attribute.length)
});

the second issue you can resolve using regex

Kacper
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0

use the count() method for the number of elements inside a Promise.

Now for your specific problem, you should do something like:

element(by.id('driverID')).getAttribute('value').then(function(attr) {
    var length = attr.length; // I don't really need why you need this length
    if (!isNaN(attr[0]) && !isNaN(attr[1])) {
        // 1st and 2nd characters of the string are numbers.
    }
})
eLRuLL
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  • thanks a lot for the solution. Can you please let me know how to get the substring in protractor tests? – VonNet Dec 14 '17 at 14:45
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    the `attr` is already a string, we already resolved the Promise and you can use direct javascript with that attribute, check [this](https://www.w3schools.com/jsref/jsref_substring.asp) – eLRuLL Dec 14 '17 at 14:50