检查 C# 中的元素是否为空

Question

I have this to enter data into an input field in a form:

Driver_.FindElement(By.XPath("//input[@aria-labelledby='i1']")).SendKeys("text to enter");

it works fine, but I need to check if the field is empty first I have tried:

string Result = Driver.FindElement(By.XPath("//input[@aria-labelledby='i1']")).Text;

but the var Result returns blank when the field contains text. I am trying to read the text in the field and act accordingly, with

string Result = Driver.FindElement(By.XPath("//input[@aria-labelledby='i1']")).Text;

But returns blank.
.Tagname returns "input"
.Enabled returns "True"
.Text returns ""

The HTML:

<input type="text" class="quantumWizTextinputPaperinputInput exportInput" jsname="YPqjbf" autocomplete="off" tabindex="0" aria-labelledby="i1" aria-describedby="i2 i3" dir="auto" data-initial-dir="auto" data-initial-value="this is text I put in the field" badinput="false">

Answer 1

Form input fields have a value property, which stores the text that was entered by the user. You need to get the value property using Selenium:

var input = Driver.FindElement(By.XPath("//input[@aria-labelledby='i1']"));

if (!string.IsNullOrEmpty(input.GetProperty("value")))
{
    input.SendKeys("text to enter");
}

Note that the value HTML attribute and value Document Object Model property are different things. The value HTML attribute usually retains the same text as when the page first loaded, but the value DOM property changes when the user enters or changes the text in the form field.