Js implements the select input filtering code for the select component

The js code to implement select input filtering of select component is as follows:

/**

* Among them //The section between ****** shows the function code added on top of the code that did not select the input filtering function

**

/


(function ( $ ) {

$.fn.editableSelect = function() {
var instanceVar;
//This this.each() refers to the traversal of the current object, which in this case refers to the traversal of the current two drop-down selection objects
this.each(function(){
var originalSelect = $(this);
//check if element is a select
if(originalSelect[0].tagName.toUpperCase()==="SELECT"){
//Wrap the original select in the original <Select> Peripheral insertion <Div> </ div> box
originalSelect.wrap($("<div/>"));
var wrapper = originalSelect.parent();
wrapper.css({display: "inline-block"});
//place an input which will represent the editable select
//Add input to the selection menu. Input the Alt title... Style = "width:..." Value = "">
var inputSelect = $("<input/>").insertBefore(originalSelect);
//get and remove the original id
var objID = originalSelect.attr("id");
originalSelect.removeAttr("id");
//add the attributes from the original select
//Various property Settings of input field
inputSelect.attr({
alt: originalSelect.attr("alt"),
title: originalSelect.attr("title"),
class: originalSelect.attr("class"),
name: originalSelect.attr("name"),
disabled: originalSelect.attr("disabled"),
tabindex: originalSelect.attr("tabindex"),
id: objID
});
//get the editable css properties from the select
var rightPadding = 15;
inputSelect.css({
width: originalSelect.width()-rightPadding,
height: originalSelect.height(),
fontFamily: originalSelect.css("fontFamily"),
fontSize: originalSelect.css("fontSize"),
background: originalSelect.css("background"),
paddingRight: rightPadding
});
inputSelect.val(originalSelect.val());
//add the triangle at the right
var triangle = $("<div/>").css({
height: 0, width: 0,
borderLeft: "5px solid transparent",
borderRight: "5px solid transparent", 
borderTop: "7px solid #999",
position: "relative",
top: -(inputSelect.height()/2)-5,
left: inputSelect.width()+rightPadding-10,
marginBottom: "-7px",
pointerEvents: "none"
}).insertAfter(inputSelect);
//create the selectable list that will appear when the input gets focus
//When I focus, plus <Ol> <Ol /> A drop-down box
var selectList = $("<ol/>").css({
display: "none",
listStyleType: "none",
width: inputSelect.outerWidth()-2,
padding: 0,
margin: 0,
border: "solid 1px #ccc",
fontFamily: inputSelect.css("fontFamily"),
fontSize: inputSelect.css("fontSize"),
background: "#fff",
position: "absolute",
zIndex: 1000000
}).insertAfter(triangle);
//add options
//All the data in the current drop-down box is stored in the resourceData variable
//******
var resourceData = [];
originalSelect.children().each(function(index, value){
prepareOption($(value).text(), wrapper);
resourceData.push($(value).text());
});
//******
//bind the focus handler
//FadeIn (100) when the mouse is focused, that is, the drop-down displays the current drop-down box
inputSelect.focus(function(){
selectList.fadeIn(100);
//V stores what was entered in the input input box. If the input is not empty, the data that appears in the v character is found in all the data stored in the original drop-down box and pressed into the newResourceData variable
//******
var v = inputSelect.val();
var newResourceData = [];
if(v != "") {
$.each(resourceData, function(i, t){
if(t.indexOf(v) != -1)
newResourceData.push(t);
});
}
wrapper.children("ol").empty();
$.each(newResourceData, function(i, t){
prepareOption(t, wrapper);
});
//******
}).blur(function(){
selectList.fadeOut(100); 
}).keyup(function(e){
if(e.which==13) inputSelect.trigger("blur");
//An event that is executed when the enter shortcut is pressed and unpressed
//******
var v = inputSelect.val();
var newResourceData = [];
if(v != "") {
$.each(resourceData, function(i, t){
if(t.indexOf(v) != -1)
newResourceData.push(t);
});
}
wrapper.children("ol").empty();
$.each(newResourceData, function(i, t){
prepareOption(t, wrapper);
});
//******
});
//hide original element
originalSelect.css({visibility: "hidden", display: "none"});

//save this instance to return it
instanceVar = inputSelect
}else{
//not a select
return false;
}
});//-end each




instanceVar.addOption = function(value){
prepareOption(value, instanceVar.parent()); 
};


instanceVar.removeOption = function(value){
switch(typeof(value)){
case "number":
instanceVar.parent().children("ol").children(":nth("+value+")").remove();
break; 
case "string":
instanceVar.parent().children("ol").children().each(function(index, optionValue){
if($(optionValue).text()==value){
$(optionValue).remove();
}
});
break;
} 
};


instanceVar.restoreSelect = function(){
var originalSelect = instanceVar.parent().children("select");
var objID = instanceVar.attr("id");
instanceVar.parent().before(originalSelect);
instanceVar.parent().remove();
originalSelect.css({visibility: "visible", display: "inline-block"});
originalSelect.attr({id: objID});
};

//return the instance
return instanceVar;
};


//The prepareOption function adds a new option to the current drop-down box
function prepareOption(value, wrapper){
var selectOption = $("<li>"+value+"</li>").appendTo(wrapper.children("ol"));
var inputSelect = wrapper.children("input");
selectOption.css({
padding: "3px",
textAlign: "left",
cursor: "pointer" 
}).hover(
function(){
selectOption.css({backgroundColor: "#eee"});
},
function(){
selectOption.css({backgroundColor: "#fff"}); 
});
//bind click on this option
selectOption.click(function(){
inputSelect.val(selectOption.text());
inputSelect.trigger("change");
}); 
}

}( jQuery ));