Checking for empty inputs using Html, JavaScript, and CSS

Question

Checking for empty inputs using Html, JavaScript, and CSS

I need help with a form that has 6 input fields. I want to ensure all fields are filled out, and if not, display an alert message. Any suggestions on how to achieve this?

Additionally, I'm experiencing difficulties implementing different font styles. When selecting a font style option, the text entered in the input field should change accordingly. How can I make this work, including updating the text before "company" and so on?

Below is the code snippet:

function SkrivUt() {
  var el = document.getElementById('f');
  el.style.color = document.getElementById('textColor').value;
  el.style.fontStyle = document.getElementById('selectedFont').value;
  el.style.backgroundColor = document.getElementById('backGroundColour').value;

  $("#area1").html($("#foretagText").val());
  $("#area2").html($("#efternamnText").val());
  $("#area3").html($("#fornamnNamnText").val());
  $("#area4").html($("#titleText").val());
  $("#area5").html($("#telefonText").val());
  $("#area6").html($("#epostText").val());
  $("#visitkort").hide();
  $("#visitkortsDemo").show();
}

function reset() {
  document.getElementById('foretagText').value = "";
  document.getElementById('efternamnText').value = "";
  document.getElementById('fornamnNamnText').value = "";
  document.getElementById('titleText').value = "";
  document.getElementById('telefonText').value = "";
  document.getElementById('epostText').value = "";
}

.form-style-3 {
  max-width: 400px;
  max-height 400px;
  font-family: "Comic Sans MS", cursive, sans-serif;
}
.form-style-3 label {
  display: block;
  margin-bottom: 10px;
}
.form-style-3 label span {
  float: left;
  width: 150px;
  font-weight: bold;
  font-size: 13px;
  text-shadow: 1px 1px 1px #fff;
}
...

<!DOCTYPE html>
<html>
...

javascript jquery html css input

Answer 1

Answer №1

If you're looking for a simple solution, consider utilizing the required attribute in HTML5!

Here is an example:

<input type="text" id="foretagText" required />

By using this attribute, you can prompt browser alerts when the input field is left empty, eliminating the need for complex custom Javascript.

Answer 2

If you're looking for a simple solution, consider utilizing the required attribute in HTML5!

Here is an example:

<input type="text" id="foretagText" required />

By using this attribute, you can prompt browser alerts when the input field is left empty, eliminating the need for complex custom Javascript.

Answer 3

Answer №2

Since you haven't attempted a lot, I won't just provide the answer outright. However, here's an idea written in basic JavaScript. Of course, you'll need to come up with a more robust method for gathering input Ids.

<script>

var inputs = ["inputid1", "inputid2", "inputid3"];
var unfilledElement = "";
for (var id in inputs){
     var element = document.getElementById(id);
     if(element.value === ""){
         unfilledElement = id;
         break;
     }
}

if(unfilledElement !== ""){
   alert("Please fill out: " + unfilledElement);

}

</script>

Answer 4

Since you haven't attempted a lot, I won't just provide the answer outright. However, here's an idea written in basic JavaScript. Of course, you'll need to come up with a more robust method for gathering input Ids.

<script>

var inputs = ["inputid1", "inputid2", "inputid3"];
var unfilledElement = "";
for (var id in inputs){
     var element = document.getElementById(id);
     if(element.value === ""){
         unfilledElement = id;
         break;
     }
}

if(unfilledElement !== ""){
   alert("Please fill out: " + unfilledElement);

}

</script>

Answer 5

Answer №3

// Initialize an array to store errors
var errorArray = [];

// Check if value is an empty string for foretagText
if ($("#foretagText").val() === "") {
  // Add error message to error array
  errorArray.push("Foretag field is required");
}

// Make sure to only use individual if statements without nesting
if ($("#idOfNextValue").val() === "") {
  // Add error message to error array
  errorArray.push("ID of next value not entered");
}

// Display all error messages in the error array with a line break
alert(errorArray.length + " Errors:<br>" + errorArray.join("<br>"));

Answer 6

// Initialize an array to store errors
var errorArray = [];

// Check if value is an empty string for foretagText
if ($("#foretagText").val() === "") {
  // Add error message to error array
  errorArray.push("Foretag field is required");
}

// Make sure to only use individual if statements without nesting
if ($("#idOfNextValue").val() === "") {
  // Add error message to error array
  errorArray.push("ID of next value not entered");
}

// Display all error messages in the error array with a line break
alert(errorArray.length + " Errors:<br>" + errorArray.join("<br>"));

Answer 7

Answer №4

Using the required attribute in HTML5 is simple:

<input type="text" required>

Alternatively, you can achieve a similar validation using jQuery:

Imagine you have these input fields in your HTML:

<input type="text" id="input-1">
<input type="text" id="input-2">
<input type="text" id="input-3">
<input type="text" id="input-4">

Continuing for more inputs...

Now, the jQuery code to check if any of these input fields are empty:

if($("[id^=input]").val()=="")
{
  alert("error");
  return;
}

Answer 8

Using the required attribute in HTML5 is simple:

<input type="text" required>

Alternatively, you can achieve a similar validation using jQuery:

Imagine you have these input fields in your HTML:

<input type="text" id="input-1">
<input type="text" id="input-2">
<input type="text" id="input-3">
<input type="text" id="input-4">

Continuing for more inputs...

Now, the jQuery code to check if any of these input fields are empty:

if($("[id^=input]").val()=="")
{
  alert("error");
  return;
}

Answer 9

Answer №5

One method in HTML is to utilize the required attribute:

<input type="text" id="somename" required>

Another approach using Javascript:

if ($('#foretagText').val() == '' || $('#efternamnText').val() != ' ...) {
   alert("Fields empty");
 }

Answer 10

One method in HTML is to utilize the required attribute:

<input type="text" id="somename" required>

Another approach using Javascript:

if ($('#foretagText').val() == '' || $('#efternamnText').val() != ' ...) {
   alert("Fields empty");
 }

Answer 11

Answer №6

When structuring your HTML code, make sure to include the required attribute in a select element if you want the user to choose from a specific set of options.


<select class="select-field" id="backGroundColour" required>
    <option value="RoyalBlue">Blue</option>
    <option value="Yellow">Yellow</option>
    <option value="Crimson">Red</option>
</select>

If you're encountering issues with changing the style of a label, it might be because you're trying to modify it directly without updating the corresponding CSS file.

Answer 12

When structuring your HTML code, make sure to include the required attribute in a select element if you want the user to choose from a specific set of options.


<select class="select-field" id="backGroundColour" required>
    <option value="RoyalBlue">Blue</option>
    <option value="Yellow">Yellow</option>
    <option value="Crimson">Red</option>
</select>

If you're encountering issues with changing the style of a label, it might be because you're trying to modify it directly without updating the corresponding CSS file.

Checking for empty inputs using Html, JavaScript, and CSS

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

Answer №6

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