Use JavaScript to convert only the initial letter to uppercase

Question

Use JavaScript to convert only the initial letter to uppercase

Once again, I am in the process of learning! Apologies for the simple questions, but learning is key...

Attempting to implement a trick I found online to change all letters to uppercase, I am now trying to adjust it to only capitalize the first letters. Take a look at the code snippet below - specifically focusing on the JavaScript onkeyup:

Code snippet that works:

<label for="class">Classification</label>
<input type="text" name="class" id="class" value="" required="true" placeholder="" style="text-transform:uppercase" onkeyup="javascript:this.value=this.value.toUpperCase();" />

Code snippet that does not work:

<label for="judge">Judge's Name</label>
<input type="text" name="judge" id="judge" value="" required="true" placeholder="" list="judges" style="text-transform:capitalize" onkeyup="javascript:this.value=this.charAt(0).toUpperCase() + this.substr(1);" />

javascript html css

Answer 1

Answer №1

You missed retrieving the value property. To apply charAt and substr, you should do it on a string rather than directly on the DOM element.

<label for="judge">Judge's Name</label>
<input type="text" name="judge" id="judge" value="" required="true" placeholder="" list="judges" style="text-transform:capitalize" onkeyup="javascript:this.value=this.value.charAt(0).toUpperCase() + this.value.substr(1);" />

Just so you know: It's always better to utilize CSS, as there is an option for capitalizing the first letter using text-transform:capitalize. Instead of inline script code, consider using a function to enhance readability and manageability.

UPDATE: Another recommendation is to use the HTML5 input event instead of keyup for better functionality.

<label for="judge">Judge's Name</label>
<input type="text" name="judge" id="judge" value="" required="true" placeholder="" list="judges" style="text-transform:capitalize" oninput="javascript:this.value=this.value.charAt(0).toUpperCase() + this.value.substr(1);" />

You can also avoid the issue of the moving arrow key (as pointed out by @stdob) by adding an additional hidden input field named judge and updating the value in that field to transfer to the server.

function transform(ele) {
  var hid = document.getElementById('judge');
  hid.value =
    ele.value.charAt(0).toUpperCase() + ele.value.substr(1);
}

<label for="judge">Judge's Name</label>
<input type="text" name="judge" id="judge" value="" required="true" placeholder="" list="judges" style="text-transform:capitalize" onkeyup="transform(this)" />
<input type="hidden" name="judge" id="judge" value="" />

Answer 2

You missed retrieving the value property. To apply charAt and substr, you should do it on a string rather than directly on the DOM element.

<label for="judge">Judge's Name</label>
<input type="text" name="judge" id="judge" value="" required="true" placeholder="" list="judges" style="text-transform:capitalize" onkeyup="javascript:this.value=this.value.charAt(0).toUpperCase() + this.value.substr(1);" />

Just so you know: It's always better to utilize CSS, as there is an option for capitalizing the first letter using text-transform:capitalize. Instead of inline script code, consider using a function to enhance readability and manageability.

UPDATE: Another recommendation is to use the HTML5 input event instead of keyup for better functionality.

<label for="judge">Judge's Name</label>
<input type="text" name="judge" id="judge" value="" required="true" placeholder="" list="judges" style="text-transform:capitalize" oninput="javascript:this.value=this.value.charAt(0).toUpperCase() + this.value.substr(1);" />

You can also avoid the issue of the moving arrow key (as pointed out by @stdob) by adding an additional hidden input field named judge and updating the value in that field to transfer to the server.

function transform(ele) {
  var hid = document.getElementById('judge');
  hid.value =
    ele.value.charAt(0).toUpperCase() + ele.value.substr(1);
}

<label for="judge">Judge's Name</label>
<input type="text" name="judge" id="judge" value="" required="true" placeholder="" list="judges" style="text-transform:capitalize" onkeyup="transform(this)" />
<input type="hidden" name="judge" id="judge" value="" />

Use JavaScript to convert only the initial letter to uppercase

Answer №1

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