仅当 label 文本可用时才添加星号

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

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]);
  }
}

Answer 2

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>