Question

我有以下代码，效果很好，但我对JavaScript（和jQuery）相对较新，我无法弄清楚如何只允许数据源中的条目。

目前，您可以从数据源中选择并输入您想要的任何内容。

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>jQuery UI Autocomplete - Multiple values</title>
  <link rel="stylesheet" href="//code.jquery.com/ui/1.11.2/themes/smoothness/jquery-ui.css">
  <script src="//code.jquery.com/jquery-1.10.2.js"></script>
  <script src="//code.jquery.com/ui/1.11.2/jquery-ui.js"></script>
  <link rel="stylesheet" href="/resources/demos/style.css">
  <script>
  $(function() {
    var availableTags = [
      "ActionScript",
      "AppleScript",
      "Asp",
      "BASIC",
      "C",
      "C++",
      "Clojure",
      "COBOL",
      "ColdFusion",
      "Erlang",
      "Fortran",
      "Groovy",
      "Haskell",
      "Java",
      "JavaScript",
      "Lisp",
      "Perl",
      "PHP",
      "Python",
      "Ruby",
      "Scala",
      "Scheme"
    ];
    function split( val ) {
      return val.split( /,\s*/ );
    }
    function extractLast( term ) {
      return split( term ).pop();
    }

    $( "#tags" )
      // don't navigate away from the field on tab when selecting an item
      .bind( "keydown", function( event ) {
        if ( event.keyCode === $.ui.keyCode.TAB &&
            $( this ).autocomplete( "instance" ).menu.active ) {
          event.preventDefault();
        }
      })
      .autocomplete({
        minLength: 0,
        source: function( request, response ) {
          // delegate back to autocomplete, but extract the last term
          response( $.ui.autocomplete.filter(
            availableTags, extractLast( request.term ) ) );
        },
        focus: function() {
          // prevent value inserted on focus
          return false;
        },
        select: function( event, ui ) {
          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;
        }
      });
  });
  </script>
</head>
<body>

<div class="ui-widget">
  <label for="tags">Tag programming languages: </label>
  <input id="tags" size="50">
</div>


</body>
</html>

Answer 1

您可以延长_renderMenu并以此方式限制结果。

DEMO：http://jsfiddle.net/dirtyd77/kqdL5jeh/2/

$(function () {
    var availableTags = [
        "ActionScript",
        "AppleScript",
        "Asp",
        "BASIC",
        "C",
        "C++",
        "Clojure",
        "COBOL",
        "ColdFusion",
        "Erlang",
        "Fortran",
        "Groovy",
        "Haskell",
        "Java",
        "JavaScript",
        "Lisp",
        "Perl",
        "PHP",
        "Python",
        "Ruby",
        "Scala",
        "Scheme"];

    function split(val) {
        return val.split(/,\s*/);
    }

    function extractLast(term) {
        return split(term).pop();
    }

    var auto = $("#tags")
    // don't navigate away from the field on tab when selecting an item
    .bind("keydown", function (event) {
        if (event.keyCode === $.ui.keyCode.TAB && $(this).autocomplete("instance").menu.active) {
            event.preventDefault();
        }
    })
        .autocomplete({
        minLength: 0,
        source: function (request, response) {
            // delegate back to autocomplete, but extract the last term
            response($.ui.autocomplete.filter(
            availableTags, extractLast(request.term)));
        },
        focus: function () {
            // prevent value inserted on focus
            return false;
        },
        select: function (event, ui) {
            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;
        }
    }).data('ui-autocomplete');

    // render the menu, use itemLimit and change that :-D
    auto._renderMenu = function (ul, items) {
        var self = this,
            itemLimit = 1;

        $.each(items, function (i, item) {
            if (i < itemLimit) self._renderItemData(ul, item);
        });
    };

});

Answer 2

由于数组在客户端，你可以直接将onchange监听器连接到输入框，并用数组检查输入框的值，如果显示错误，你甚至可以根据首字母建议它们输入。否则使用ajax请求

如何修改此JavaScript以限制数据源中项目的条目？

2 个答案: