Javascript search and display divs with matching keywords

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What I\'m looking for:

I\'m working on creating an easy way for a user to search a list of people, and for results to instantly display below the search field. The resul

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日久生厌

2021-02-09 19:24

Split the words in the search string with a regex like

searchString.split(/\W/);

and do a OR search over each of the words in the resulting array.

Updated fiddle

var searchStrings = str_needle.split(/\W/);

for (var i = 0, len = searchStrings.length; i < len; i++) {
    var currentSearch = searchStrings[i].toUpperCase();
    if (currentSearch !== "") {
        nameDivs = document.getElementsByClassName("name");
        for (var j = 0, divsLen = nameDivs.length; j < divsLen; j++) {
            if (nameDivs[j].textContent.toUpperCase().indexOf(currentSearch) !== -1) {
                nameDivs[j].style.display = "block";
            }
        }
    }
}

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小蘑菇

2021-02-09 19:28

One further approach, is as follows:

function gid(a_id) {
  return document.getElementById(a_id);
}

function close_all() {

  // applies the Array.prototype.forEach() method to the array-like nodeList
  // returned by document.querySelectorAll() (the string passed to which finds all
  // elements with an id that starts with ('^=') the string 'user_':
  [].forEach.call(document.querySelectorAll('[id^=user_]'), function(div) {
    // 'div' is the array element (the node) itself:
    div.style.display = 'none';
  });

}


function find_my_div() {
  close_all();

  // getting the trimmed lower-cased string from the input element, split
  // on white-space characters to create an array:
  var keywords = gid('edit_search').value.trim().toLowerCase().split(/\s+/),
    // as above, selecting all elements whose id starts with the string 'user_':
    haystack = document.querySelectorAll('[id^="user_"]'),
    // working out whether text is accessed by node.textContent, or node.innerText:
    textProp = 'textContent' in document.body ? 'textContent' : 'innerText',
    // an initialised variable, for later:
    userWords,

    // filters the haystack (the divs whose id starts with 'user_'):
    found = [].filter.call(haystack, function(user) {
      // assigns the lower-cased string to the created-variable:
      userWords = user[textProp].toLowerCase();
      // returns those div elements whose text contains some of
      // the words returned, earlier, as the keywords:
      return keywords.some(function (word) {
        return userWords.indexOf(word) > -1;
      });
    });

  // iterates over the found elements, and shows them:
  [].forEach.call(found, function(user) {
    user.style.display = 'block';
  });

}

<body>
  <input type="text" id="edit_search" onkeyup="javascript: find_my_div();">
  <input type="button" onClick="javascript: find_my_div();" value="Find">

  <script>
    function gid(a_id) {
      return document.getElementById(a_id);
    }

    function close_all() {

      [].forEach.call(document.querySelectorAll('[id^=user_]'), function(div) {
        div.style.display = 'none';
      });

    }


    function find_my_div() {
      close_all();
      var keywords = gid('edit_search').value.trim().toLowerCase().split(/\s+/),
        haystack = document.querySelectorAll('[id^="user_"]'),
        textProp = 'textContent' in document.body ? 'textContent' : 'innerText',
        userWords,
        found = [].filter.call(haystack, function(user) {
          userWords = user[textProp].toLowerCase();
          return keywords.some(function (word) {
            return userWords.indexOf(word) > -1;
          });
        });
      console.log(found);
      [].forEach.call(found, function(user) {
        user.style.display = 'block';
      });

    }
  </script>

  <div id="user_0" style="display:none">Andy Daulton
    <br/>Owner Nissan
    <br/>
    <br/>
  </div>
  <div id="user_1" style="display:none">Doug Guy
    <br/>Bug Collector
    <br/>
    <br/>
  </div>
  <div id="user_2" style="display:none">Sam Hilton
    <br/>Famous Celebrity in Hollywood
    <br/>
    <br/>
  </div>
  <div id="user_3" style="display:none">Don Grey
    <br/>Old man
    <br/>
    <br/>
  </div>
  <div id="user_4" style="display:none">Amy Hinterly
    <br/>Cook
    <br/>
    <br/>
  </div>
  <div id="user_5" style="display:none">Gary Doll
    <br/>Racecar Driver
    <br/>
    <br/>
  </div>
  <div id="user_6" style="display:none">Tod Akers
    <br/>Football Player
    <br/>
    <br/>
  </div>
  <div id="user_7" style="display:none">Greg Barkley
    <br/>Interior designer
    <br/>
    <br/>
  </div>
  <div id="user_8" style="display:none">Alen Simmons
    <br/>8th place winner
    <br/>
    <br/>
  </div>

References:

CSS:
- Attribute-presence and value selectors.
JavaScript:
- Array.prototype.every().
- Array.prototype.filter().
- Array.prototype.forEach().
- Array.prototype.some().
- document.querySelectorAll().
- Function.prototype.call().
- String.prototype.indexOf()

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