在 jquery 多个自动完成 ajax 中删除已选择的值
Remove already selected value in jquery multiple autocomplete ajax
如何删除 jQuery 多个自动完成列表中已选择的值？
例如，如果我选择了 word A，下次输入时它就不会出现在列表中。此外，如果有人试图使用退格键删除元素，该元素应该重新出现在自动完成列表中。
$(function() {
function split(val) {
return val.split(/,\s*/);
}
function extractLast(term) {
return split(term).pop();
}
$("#birds").on("keydown", function(event) {
if (event.keyCode === $.ui.keyCode.TAB &&
$(this).autocomplete("instance").menu.active) {
event.preventDefault();
}
}).autocomplete({
source: function(request, response) {
$.getJSON("search.php", {
term: extractLast(request.term)
}, response);
},
select: function(event, ui) {
var terms = split(this.value);
terms.pop();
terms.push(ui.item.value);
terms.push("");
this.value = terms.join(", ");
return false;
}
});
});
如果你存储 id 和文本可能会更好为什么不呢，每当你发出 ajax 请求传递这些并在服务器端处理它们时。
some_array = array();
$('[your-list]').keyup(function(e) {
var text = $(this).text();
// key backspace is released
if(e.keyCode == 8)
some_array.push(text);
});
好的，我制作了这个片段，它应该可以满足您的需要。我已经从 jquery ui 自动完成站点 https://jqueryui.com/autocomplete/ 获取了演示数据，因此您必须替换数据库中的数据
$( function() {
// Demo data -- store the data according to your need from database.
let availableTags = [
"ActionScript",
"AppleScript",
"Asp",
"BASIC",
"C",
"C++",
"Clojure",
"COBOL",
"ColdFusion",
"Erlang",
"Fortran",
"Groovy",
"Haskell",
"Java",
"JavaScript",
"Lisp",
"Perl",
"PHP",
"Python",
"Ruby",
"Scala",
"Scheme"
];
// define a new variable so that the original variable is not affected.
let new_availableTags = [];
// define a variable to store all the selected values.
let selectedVal = [];
function split( val ) {
return val.split( /,\s*/ );
}
function extractLast( term ) {
return split( term ).pop();
}
// prevent the user from going behind via cursor //cursor always on last
$( "#tags" ).on('click', (event) => {
event.currentTarget.setSelectionRange(-1, -1);
});
$( "#tags" )
// don't navigate away from the field on tab when selecting an item
.on( "keydown", function( event ) {
// prevent from giving space(32), delete(46), going back(37) and forward(39), delete a whole word(Ctrl + Backspace(8))
if(event.keyCode == 32 || event.keyCode == 46 || event.keyCode == 37 || event.keyCode == 39 || (event.ctrlKey && event.keyCode == 8)){
event.preventDefault();
}else if(event.keyCode == 8){ // on pressing backspace
let prev_val = event.currentTarget.value; //get the current input value
let last_char = prev_val.charAt(prev_val.length-1); //get the last character of value
if(last_char == ','){
selectedVal.pop(); //delete last element only if last character is a comma(,)
}
}
if (event.keyCode === $.ui.keyCode.TAB && $(this).autocomplete("instance").menu.active) {
event.preventDefault();
}
//console.log(selectedVal);
new_availableTags = availableTags; //assign the value to the new variable
selectedVal.forEach((selected) => {
// only keep the values which are not selected
new_availableTags = new_availableTags.filter(item => item != selected);
});
})
.autocomplete({
minLength: 0,
source: function( request, response ) {
// delegate back to autocomplete, but extract the last term
response( $.ui.autocomplete.filter(
new_availableTags, extractLast( request.term ) ) );
},
focus: function() {
// prevent value inserted on focus
return false;
},
select: function( event, ui ) {
selectedVal.push(ui.item.value); // insert the selected value in selectedVal
console.log(`selectedVal: ${selectedVal}`);
var terms = split( this.value );
// remove the current input
terms.pop();
// add the selected item
terms.push( ui.item.value );
// add placeholder to get the comma-and-space at the end
terms.push( "" );
this.value = terms.join( ", " );
return false;
}
});
} );
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>jQuery UI Autocomplete - Multiple values</title>
<link rel="stylesheet" href="https://code.jquery.com/ui/1.12.1/themes/base/jquery-ui.css">
<link rel="stylesheet" href="https://jqueryui.com/resources/demos/style.css">
<script src="https://code.jquery.com/jquery-1.12.4.js"></script>
<script src="https://code.jquery.com/ui/1.12.1/jquery-ui.js"></script>
</head>
<body>
<div class="ui-widget">
<label for="tags">Tag programming languages: </label>
<input id="tags" size="50">
</div>
</body>
</html>
也许这有点像你想要的：
$( function() {
// Demo data -- store the data according to your need from database.
let availableTags = [
"ActionScript",
"AppleScript",
"Asp",
"BASIC",
"C",
"C++",
"Clojure",
"COBOL",
"ColdFusion",
"Erlang",
"Fortran",
"Groovy",
"Haskell",
"Java",
"JavaScript",
"Lisp",
"Perl",
"PHP",
"Python",
"Ruby",
"Scala",
"Scheme"
];
function getTermRemainder(str, p) {
let part1 = str.substring(0,p).split(',');
let part2 = str.substring(p).split(',');
let term = (part1.pop() + part2.shift()).trim();
part1 = part1.join(',').trim();
part2 = part2.join(',').trim();
let remainder = part1.length ? (
part2.length ? part1 + ', ' + part2 : part1
) : (
part2.length ? part2 : ''
);
return {
term: term,
remainder: remainder
};
}
$("#birds")
.autocomplete({
focus: function(e, ui) {
return false;
},
source: function(request, response) {
let start = this.element.get(0).selectionStart;
let { term, remainder } = getTermRemainder(request.term, start);
term = term.toLowerCase();
let terms = remainder.split(',');
let hash = {};
for(let i = 0, l = terms.length; i < l; i++)
hash[terms[i].trim()] = true;
let matched = availableTags
.filter(function(item) {
return(
item.toLowerCase().indexOf(term) !== -1 &&
!hash[item]
);
});
response(matched);
},
select: function(event, ui) {
let selected = ui.item.value;
let val = this.value;
let pos = this.selectionStart;
let start = pos;
while(--start > 0) if(val.charAt(start) === ',') break;
let end = pos-1;
let l = val.length;
while(++end < l) if(val.charAt(end) === ',') break;
let result = '';
if(start > 0) result += val.slice(0,start) + ', ';
result += selected;
if(end < l) result += val.slice(end);
else result += ', ';
this.value = result;
return false;
}
});
});
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>jQuery UI Autocomplete - Multiple values</title>
<link rel="stylesheet" href="https://code.jquery.com/ui/1.12.1/themes/base/jquery-ui.css">
<link rel="stylesheet" href="https://jqueryui.com/resources/demos/style.css">
<script src="https://code.jquery.com/jquery-1.12.4.js"></script>
<script src="https://code.jquery.com/ui/1.12.1/jquery-ui.js"></script>
</head>
<body>
<div class="ui-widget">
<label for="birds">Tag programming languages: </label>
<input id="birds" size="50">
</div>
</body>
</html>
如何删除 jQuery 多个自动完成列表中已选择的值？
例如，如果我选择了 word A，下次输入时它就不会出现在列表中。此外，如果有人试图使用退格键删除元素，该元素应该重新出现在自动完成列表中。
$(function() {
function split(val) {
return val.split(/,\s*/);
}
function extractLast(term) {
return split(term).pop();
}
$("#birds").on("keydown", function(event) {
if (event.keyCode === $.ui.keyCode.TAB &&
$(this).autocomplete("instance").menu.active) {
event.preventDefault();
}
}).autocomplete({
source: function(request, response) {
$.getJSON("search.php", {
term: extractLast(request.term)
}, response);
},
select: function(event, ui) {
var terms = split(this.value);
terms.pop();
terms.push(ui.item.value);
terms.push("");
this.value = terms.join(", ");
return false;
}
});
});
如果你存储 id 和文本可能会更好为什么不呢，每当你发出 ajax 请求传递这些并在服务器端处理它们时。
some_array = array();
$('[your-list]').keyup(function(e) {
var text = $(this).text();
// key backspace is released
if(e.keyCode == 8)
some_array.push(text);
});
好的，我制作了这个片段，它应该可以满足您的需要。我已经从 jquery ui 自动完成站点 https://jqueryui.com/autocomplete/ 获取了演示数据，因此您必须替换数据库中的数据
$( function() {
// Demo data -- store the data according to your need from database.
let availableTags = [
"ActionScript",
"AppleScript",
"Asp",
"BASIC",
"C",
"C++",
"Clojure",
"COBOL",
"ColdFusion",
"Erlang",
"Fortran",
"Groovy",
"Haskell",
"Java",
"JavaScript",
"Lisp",
"Perl",
"PHP",
"Python",
"Ruby",
"Scala",
"Scheme"
];
// define a new variable so that the original variable is not affected.
let new_availableTags = [];
// define a variable to store all the selected values.
let selectedVal = [];
function split( val ) {
return val.split( /,\s*/ );
}
function extractLast( term ) {
return split( term ).pop();
}
// prevent the user from going behind via cursor //cursor always on last
$( "#tags" ).on('click', (event) => {
event.currentTarget.setSelectionRange(-1, -1);
});
$( "#tags" )
// don't navigate away from the field on tab when selecting an item
.on( "keydown", function( event ) {
// prevent from giving space(32), delete(46), going back(37) and forward(39), delete a whole word(Ctrl + Backspace(8))
if(event.keyCode == 32 || event.keyCode == 46 || event.keyCode == 37 || event.keyCode == 39 || (event.ctrlKey && event.keyCode == 8)){
event.preventDefault();
}else if(event.keyCode == 8){ // on pressing backspace
let prev_val = event.currentTarget.value; //get the current input value
let last_char = prev_val.charAt(prev_val.length-1); //get the last character of value
if(last_char == ','){
selectedVal.pop(); //delete last element only if last character is a comma(,)
}
}
if (event.keyCode === $.ui.keyCode.TAB && $(this).autocomplete("instance").menu.active) {
event.preventDefault();
}
//console.log(selectedVal);
new_availableTags = availableTags; //assign the value to the new variable
selectedVal.forEach((selected) => {
// only keep the values which are not selected
new_availableTags = new_availableTags.filter(item => item != selected);
});
})
.autocomplete({
minLength: 0,
source: function( request, response ) {
// delegate back to autocomplete, but extract the last term
response( $.ui.autocomplete.filter(
new_availableTags, extractLast( request.term ) ) );
},
focus: function() {
// prevent value inserted on focus
return false;
},
select: function( event, ui ) {
selectedVal.push(ui.item.value); // insert the selected value in selectedVal
console.log(`selectedVal: ${selectedVal}`);
var terms = split( this.value );
// remove the current input
terms.pop();
// add the selected item
terms.push( ui.item.value );
// add placeholder to get the comma-and-space at the end
terms.push( "" );
this.value = terms.join( ", " );
return false;
}
});
} );
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>jQuery UI Autocomplete - Multiple values</title>
<link rel="stylesheet" href="https://code.jquery.com/ui/1.12.1/themes/base/jquery-ui.css">
<link rel="stylesheet" href="https://jqueryui.com/resources/demos/style.css">
<script src="https://code.jquery.com/jquery-1.12.4.js"></script>
<script src="https://code.jquery.com/ui/1.12.1/jquery-ui.js"></script>
</head>
<body>
<div class="ui-widget">
<label for="tags">Tag programming languages: </label>
<input id="tags" size="50">
</div>
</body>
</html>
也许这有点像你想要的：
$( function() {
// Demo data -- store the data according to your need from database.
let availableTags = [
"ActionScript",
"AppleScript",
"Asp",
"BASIC",
"C",
"C++",
"Clojure",
"COBOL",
"ColdFusion",
"Erlang",
"Fortran",
"Groovy",
"Haskell",
"Java",
"JavaScript",
"Lisp",
"Perl",
"PHP",
"Python",
"Ruby",
"Scala",
"Scheme"
];
function getTermRemainder(str, p) {
let part1 = str.substring(0,p).split(',');
let part2 = str.substring(p).split(',');
let term = (part1.pop() + part2.shift()).trim();
part1 = part1.join(',').trim();
part2 = part2.join(',').trim();
let remainder = part1.length ? (
part2.length ? part1 + ', ' + part2 : part1
) : (
part2.length ? part2 : ''
);
return {
term: term,
remainder: remainder
};
}
$("#birds")
.autocomplete({
focus: function(e, ui) {
return false;
},
source: function(request, response) {
let start = this.element.get(0).selectionStart;
let { term, remainder } = getTermRemainder(request.term, start);
term = term.toLowerCase();
let terms = remainder.split(',');
let hash = {};
for(let i = 0, l = terms.length; i < l; i++)
hash[terms[i].trim()] = true;
let matched = availableTags
.filter(function(item) {
return(
item.toLowerCase().indexOf(term) !== -1 &&
!hash[item]
);
});
response(matched);
},
select: function(event, ui) {
let selected = ui.item.value;
let val = this.value;
let pos = this.selectionStart;
let start = pos;
while(--start > 0) if(val.charAt(start) === ',') break;
let end = pos-1;
let l = val.length;
while(++end < l) if(val.charAt(end) === ',') break;
let result = '';
if(start > 0) result += val.slice(0,start) + ', ';
result += selected;
if(end < l) result += val.slice(end);
else result += ', ';
this.value = result;
return false;
}
});
});
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>jQuery UI Autocomplete - Multiple values</title>
<link rel="stylesheet" href="https://code.jquery.com/ui/1.12.1/themes/base/jquery-ui.css">
<link rel="stylesheet" href="https://jqueryui.com/resources/demos/style.css">
<script src="https://code.jquery.com/jquery-1.12.4.js"></script>
<script src="https://code.jquery.com/ui/1.12.1/jquery-ui.js"></script>
</head>
<body>
<div class="ui-widget">
<label for="birds">Tag programming languages: </label>
<input id="birds" size="50">
</div>
</body>
</html>