Add asterisk only if label text is available - html

Question

I am trying to add an asterisk to a label text of an input, if the input filed is required. I used this answer and referred this answer and I can get the desired result using the following code
jQuery(function() {
jQuery("[required]").before(jQuery("<span>", {
class: "required"
}).html("*"));
});
However, I do not want the asterisk to be added for input fields where the label texts are not available.
Look at the following where a label text is not available;
<label>
<span class="required">*</span>
<input type="text" class="form-control" id="perm_city" name="perm_city" required="required" />
</label>
as opposed to the following where a label text is available
<label for="clientid">Client ID Number
<span class="required">*</span>
<input type="text" class="form-control" id="clientid" name="clientid" required="required" />
</label>
Both has the asterisk added before the input element by my jQuery script. But the desired output is as follows;
Can anyone help me achieve this? TIA

Answer 1

You can use .each loop to iterate through all required inputs then using .clone & .text() get the label texts ignoring all children it has . Then , if the length of text is greater then 0 append your span.
Demo Code :
jQuery(function() {
//loop through required input
jQuery("[required]").each(function() {
//get label and remove child only get text
var cloned = jQuery(this).closest("label").clone().children().remove().end().text().trim();
console.log("Length--" + cloned.length)
//check if txt length is > 0
if (cloned.length > 0) {
jQuery(this).before(jQuery("<span>", {
class: "required"
}).html("*"));
}
})
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<label>
<input type="text" class="form-control" id="perm_city" name="perm_city" required="required" />
</label><br>
<label for="clientid">Client ID Number
<input type="text" class="form-control" id="clientid" name="clientid" required="required" />
</label><br>
<label for="clientid">Client ID Number1
<input type="text" class="form-control" id="clientid" name="clientid" required="required" />
</label><br>
<label for="clientid">
<input type="text" class="form-control" id="clientid" name="clientid" required="required" />
</label>

Answer 2

If this is how your labels are included, then you can clone each <label> element and remove its children, then check if any text remains. This is what I mean (I am not familiar with jQuery, so I will write in vanilla JS):
var labels = document.querySelectorAll("label");
for (var i = 0; i < labels.length; i++) {
var clonedLabel = labels[i].cloneNode(true);
var chldrn = clonedLabel.children.length;
for (var j = 0; j < chldrn; j++) {
clonedLabel.removeChild(clonedLabel.children[0]);
}
// Remove spaces
var innerHTML = clonedLabel.innerHTML.trim();
if (innerHTML != "") {
// Add the asterisk
var span = document.createElement("span");
span.className = "required";
span.innerHTML = "*";
labels[i].insertBefore(span,labels[i].children[0]);
}
}