How to get the value of text input field using javascript?

Contents 1. JavaScript Input: Main Tips2. textObject.value Property Explained3. Write it Correctly4. Useful Code Examples for Practice

JavaScript Input: Main Tips

The JavaScript input text property is used khổng lồ set or return the value of a text input field. The value property contains either the default value that is present upon loading the element, the value entered by the user, or the value assigned by the script.

textObject.value Property Explained

JavaScript .value property can help you manage nội dung on your websites. For instance, forms and dropdown lists are appreciated elements that trang web developers include in their pages to communicate with their visitors or retrieve information.

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The following code example shows how the JavaScript input đầu vào property can modify the value of a text field:


Example Copy
document.getElementById("sampleText").value = "John Bonham";
Try it Live sầu

However, if you want to lớn perform the JavaScript get input đầu vào value task, you should remove sầu everything that comes after equal sign. Then, you will not phối the value but receive it.


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Write it Correctly

We have sầu two examples of get input đầu vào value JavaScript usage. The first one holds a code which will return the value of the property. JavaScript get value of input:

textObject.value

The second example can be used for setting the value of the property. As you can see, it contains a value called text, indicating the value of the text input field:

textObject.value = text

Just like many other JavaScript properties, this one will also generates a return value. The JavaScript input đầu vào text value property will produce a string, containing the value of the text field.

Useful Code Examples for Practice

If you are only starting to lớn learn the get đầu vào .value JavaScript, we recommkết thúc that you start by practicing with the code examples we provide in this section. While the first one might seem rather long, it illustrates how khung validation can be achieved:


Example Copy
var email = document.getElementById("email").value.indexOf("
"
); var age = document.getElementById("age").value; var firstName = document.getElementById("firstName").value; Submitted = "true"; if (firstName.length > 10) if (isNaN(age) || age < 12 || age > 100) if (at == -1) if (Submitted == "false")
Try it Live

If you clichồng Try it Live button, you will see that the text input đầu vào field contains a dropdown list:


Example Copy
var sampleList = document.getElementById("sampleList"); document.getElementById("favoriteElem").value = sampleList.options.text;
Try it Live sầu

This example shows a different type of dropdown menu in the text đầu vào field. See for yourself & compare:


Example Copy
var none = document.getElementById("none"); var option = none.options.text; var sampleText = document.getElementById("resultElem").value; sampleText = sampleText + option; document.getElementById("resultElem").value = txt;
Try it Live

Now, the following example illustrates how mặc định value & value property differ:


Example Copy
var textVal = document.getElementById("sampleText"); var defaultTextVal = textVal.defaultValue; var currentTextVal = textVal.value;
Try it Live
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