jQuery implements the method of inserting characters or expressions at the specified position in textarea_jquery

The example in this article describes how jQuery implements inserting characters or expressions at specified positions in textarea. Share it with everyone for your reference. The specific implementation method is as follows:

1. Function definition

Copy code The code is as follows:

(function($){
$.fn.extend({
          insertAtCaret: function(myValue){
          var $t=$(this)[0];
                 if (document.selection) {
This.focus();
                  sel = document.selection.createRange();
                  sel.text = myValue;
This.focus();
            }
           else
If ($t.selectionStart || $t.selectionStart == '0') {
                      var startPos = $t.selectionStart;
                    var endPos = $t.selectionEnd;
                    var scrollTop = $t.scrollTop;
$t.value = $t.value.substring(0, startPos) myValue $t.value.substring(endPos, $t.value.length);
This.focus();
$t.selectionStart = startPos myValue.length;
                                 $t.selectionEnd = startPos myValue.length;
                            $t.scrollTop = scrollTop;
                }
                   else {
This.value = myValue;
This.focus();
                }
}
})
})(jQuery);

2. Call method

Copy code The code is as follows:

$("#textareaId").insertAtCaret("New Emoticon");

I hope this article will be helpful to everyone’s jQuery programming.