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Question about JS form validation: I want to check these two input (name, question) with one...

Question about JS form validation:

I want to check these two input (name, question) with one function validateText. But how can I pass the input to the function, I did this but not working.

javascript part:

question = document.getElementById("question");

question.addEventListener("input", validateText);

pname = document.getElementById("name");

pname.addEventListener("input", validateName);

validateText function:

function validateText(e) {

var message = "";

var elem_name = e.name;

if (e.value.length == 0) { message = "You must enter a" + elem_name + "!";}

else if (e.validity.tooShort) { message = "Your" + elem_name + "is too short!";}

e.setCustomValidity(message);

e.title = message;

return message;

}

html part:

<label for="name">Name<span>*</span></label>

<input id="name" name="name" type="text" minlength="2">

<label class="blockLabel" for="question">Ask Us Any Quesion<span>*</span></label>

<textarea id="quesiton" name="question" rows="5" cols="55" minlength="15"></textarea>

When I do function for each instead of a generic validateText function, it can work:

So I think the part I did not get is how to create a generic function and pass value to it.

function validateName(e) {

var message = "";

if (pname.value.length == 0) { message = "You must enter a!";}

else if (pname.validity.tooShort) { message = "Youris too short!";}

pname.setCustomValidity(message);

pname.title = message;

return message;

}

Thank you so much!

engineering   Computer-Science   
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Homework Answers

Answer #1

Your addeventlistener is problematic, you can directly attach the function for some event in the form element.

Below is the working source code for js validation for two different form elements with generic function.

<!DOCTYPE html>

<html>

<head>

<title>Page Title</title>

<script>

function validateText(e) {

var message = "";

var targetElement = e.target || e.srcElement;

if (targetElement.value.length == 0) {

message = "You must enter a value !";

}else if (targetElement.validity.tooShort) {

message = "Your data is too short!";

}else{

message = "Your data is verified";

}

targetElement.setCustomValidity(message);

targetElement.title = message;

alert(message);

return message;

}

</script>

</head>

<body><form>

<label for="name">Name<span>*</span></label>

<input id="name" name="name" type="text" minlength="2" onblur="return validateText(event)">

<label class="blockLabel" for="question">Ask Us Any Quesion<span>*</span></label>

<textarea id="question" name="question" rows="5" cols="55" minlength="15" onblur="return validateText(event)"></textarea>

</form>

</body>

</html>

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