snipt

Ctrl+h for KB shortcuts

JavaScript

Javascript native cross browser event handler

  /*
    * JS HELPER MODULE
    * Collection of helper functions/properties   
  */
  var JShelperFunctions = function () {

    // ADD/REMOVE CROSS BROWSER EVENT
    // Native JS handler function
    var _addXEvent, _removeXEvent;
    if (window.addEventListener) {
      _addXEvent = function (obj, type, fn) {
        obj.addEventListener(type, fn, false);
      }
      _removeXEvent = function (obj, type, fn) {
        obj.removeEventListener(type, fn, false);
      }
    } else if (document.attachEvent) {
      _addXEvent = function (obj, type, fn) {
        var eProp = type + fn;
        obj['e' + eProp] = fn;
        obj[eProp] = function () { obj['e' + eProp](window.event); }
        obj.attachEvent('on' + type, obj[eProp]);
      }
      _removeXEvent = function (obj, type, fn) {
        var eProp = type + fn;
        obj.detachEvent('on' + type, obj[eProp]);
        obj[eProp] = null;
        obj["e" + eProp] = null;
      }
    }

    // Return public references to functions/properties
    return {
      addXEvent: _addXEvent,
      removeXEvent: _removeXEvent
    }
  }();

  // Get events and add/process handlers
  var MySelector = document.getElementById("SelectorDropdown");
  var MyInput = document.getElementById("InputText");

  JShelperFunctions.addXEvent(MySelector, "change", function (evt) {
    console.log(evt);
    console.log(evt.srcElement.options[evt.srcElement.selectedIndex].text, evt.srcElement.options[evt.srcElement.selectedIndex].value);
    console.log(window.location.href);
  });

  JShelperFunctions.addXEvent(MyInput, "change", function (evt) {
    console.log(evt);
    console.log(evt.srcElement.value);
  });

Description

Compact cross browser native javascript handler module example.
https://snipt.net/embed/3f1ee87f356b232d3c12d3042c10a8bb/
/raw/3f1ee87f356b232d3c12d3042c10a8bb/
3f1ee87f356b232d3c12d3042c10a8bb
js
JavaScript
52
2019-08-21T19:19:52
True
False
False
Sep 11, 2014 at 06:35 AM
/api/public/snipt/136418/
javascript-native-cross-browser-event-handler-c15fa41d
<table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><a href="#L-1"> 1</a> <a href="#L-2"> 2</a> <a href="#L-3"> 3</a> <a href="#L-4"> 4</a> <a href="#L-5"> 5</a> <a href="#L-6"> 6</a> <a href="#L-7"> 7</a> <a href="#L-8"> 8</a> <a href="#L-9"> 9</a> <a href="#L-10">10</a> <a href="#L-11">11</a> <a href="#L-12">12</a> <a href="#L-13">13</a> <a href="#L-14">14</a> <a href="#L-15">15</a> <a href="#L-16">16</a> <a href="#L-17">17</a> <a href="#L-18">18</a> <a href="#L-19">19</a> <a href="#L-20">20</a> <a href="#L-21">21</a> <a href="#L-22">22</a> <a href="#L-23">23</a> <a href="#L-24">24</a> <a href="#L-25">25</a> <a href="#L-26">26</a> <a href="#L-27">27</a> <a href="#L-28">28</a> <a href="#L-29">29</a> <a href="#L-30">30</a> <a href="#L-31">31</a> <a href="#L-32">32</a> <a href="#L-33">33</a> <a href="#L-34">34</a> <a href="#L-35">35</a> <a href="#L-36">36</a> <a href="#L-37">37</a> <a href="#L-38">38</a> <a href="#L-39">39</a> <a href="#L-40">40</a> <a href="#L-41">41</a> <a href="#L-42">42</a> <a href="#L-43">43</a> <a href="#L-44">44</a> <a href="#L-45">45</a> <a href="#L-46">46</a> <a href="#L-47">47</a> <a href="#L-48">48</a> <a href="#L-49">49</a> <a href="#L-50">50</a> <a href="#L-51">51</a> <a href="#L-52">52</a></pre></div></td><td class="code"><div class="highlight"><pre><span></span><span id="L-1"><a name="L-1"></a> <span class="cm">/*</span> </span><span id="L-2"><a name="L-2"></a><span class="cm"> * JS HELPER MODULE</span> </span><span id="L-3"><a name="L-3"></a><span class="cm"> * Collection of helper functions/properties </span> </span><span id="L-4"><a name="L-4"></a><span class="cm"> */</span> </span><span id="L-5"><a name="L-5"></a> <span class="kd">var</span> <span class="nx">JShelperFunctions</span> <span class="o">=</span> <span class="kd">function</span> <span class="p">()</span> <span class="p">{</span> </span><span id="L-6"><a name="L-6"></a> </span><span id="L-7"><a name="L-7"></a> <span class="c1">// ADD/REMOVE CROSS BROWSER EVENT</span> </span><span id="L-8"><a name="L-8"></a> <span class="c1">// Native JS handler function</span> </span><span id="L-9"><a name="L-9"></a> <span class="kd">var</span> <span class="nx">_addXEvent</span><span class="p">,</span> <span class="nx">_removeXEvent</span><span class="p">;</span> </span><span id="L-10"><a name="L-10"></a> <span class="k">if</span> <span class="p">(</span><span class="nb">window</span><span class="p">.</span><span class="nx">addEventListener</span><span class="p">)</span> <span class="p">{</span> </span><span id="L-11"><a name="L-11"></a> <span class="nx">_addXEvent</span> <span class="o">=</span> <span class="kd">function</span> <span class="p">(</span><span class="nx">obj</span><span class="p">,</span> <span class="nx">type</span><span class="p">,</span> <span class="nx">fn</span><span class="p">)</span> <span class="p">{</span> </span><span id="L-12"><a name="L-12"></a> <span class="nx">obj</span><span class="p">.</span><span class="nx">addEventListener</span><span class="p">(</span><span class="nx">type</span><span class="p">,</span> <span class="nx">fn</span><span class="p">,</span> <span class="kc">false</span><span class="p">);</span> </span><span id="L-13"><a name="L-13"></a> <span class="p">}</span> </span><span id="L-14"><a name="L-14"></a> <span class="nx">_removeXEvent</span> <span class="o">=</span> <span class="kd">function</span> <span class="p">(</span><span class="nx">obj</span><span class="p">,</span> <span class="nx">type</span><span class="p">,</span> <span class="nx">fn</span><span class="p">)</span> <span class="p">{</span> </span><span id="L-15"><a name="L-15"></a> <span class="nx">obj</span><span class="p">.</span><span class="nx">removeEventListener</span><span class="p">(</span><span class="nx">type</span><span class="p">,</span> <span class="nx">fn</span><span class="p">,</span> <span class="kc">false</span><span class="p">);</span> </span><span id="L-16"><a name="L-16"></a> <span class="p">}</span> </span><span id="L-17"><a name="L-17"></a> <span class="p">}</span> <span class="k">else</span> <span class="k">if</span> <span class="p">(</span><span class="nb">document</span><span class="p">.</span><span class="nx">attachEvent</span><span class="p">)</span> <span class="p">{</span> </span><span id="L-18"><a name="L-18"></a> <span class="nx">_addXEvent</span> <span class="o">=</span> <span class="kd">function</span> <span class="p">(</span><span class="nx">obj</span><span class="p">,</span> <span class="nx">type</span><span class="p">,</span> <span class="nx">fn</span><span class="p">)</span> <span class="p">{</span> </span><span id="L-19"><a name="L-19"></a> <span class="kd">var</span> <span class="nx">eProp</span> <span class="o">=</span> <span class="nx">type</span> <span class="o">+</span> <span class="nx">fn</span><span class="p">;</span> </span><span id="L-20"><a name="L-20"></a> <span class="nx">obj</span><span class="p">[</span><span class="s1">&#39;e&#39;</span> <span class="o">+</span> <span class="nx">eProp</span><span class="p">]</span> <span class="o">=</span> <span class="nx">fn</span><span class="p">;</span> </span><span id="L-21"><a name="L-21"></a> <span class="nx">obj</span><span class="p">[</span><span class="nx">eProp</span><span class="p">]</span> <span class="o">=</span> <span class="kd">function</span> <span class="p">()</span> <span class="p">{</span> <span class="nx">obj</span><span class="p">[</span><span class="s1">&#39;e&#39;</span> <span class="o">+</span> <span class="nx">eProp</span><span class="p">](</span><span class="nb">window</span><span class="p">.</span><span class="nx">event</span><span class="p">);</span> <span class="p">}</span> </span><span id="L-22"><a name="L-22"></a> <span class="nx">obj</span><span class="p">.</span><span class="nx">attachEvent</span><span class="p">(</span><span class="s1">&#39;on&#39;</span> <span class="o">+</span> <span class="nx">type</span><span class="p">,</span> <span class="nx">obj</span><span class="p">[</span><span class="nx">eProp</span><span class="p">]);</span> </span><span id="L-23"><a name="L-23"></a> <span class="p">}</span> </span><span id="L-24"><a name="L-24"></a> <span class="nx">_removeXEvent</span> <span class="o">=</span> <span class="kd">function</span> <span class="p">(</span><span class="nx">obj</span><span class="p">,</span> <span class="nx">type</span><span class="p">,</span> <span class="nx">fn</span><span class="p">)</span> <span class="p">{</span> </span><span id="L-25"><a name="L-25"></a> <span class="kd">var</span> <span class="nx">eProp</span> <span class="o">=</span> <span class="nx">type</span> <span class="o">+</span> <span class="nx">fn</span><span class="p">;</span> </span><span id="L-26"><a name="L-26"></a> <span class="nx">obj</span><span class="p">.</span><span class="nx">detachEvent</span><span class="p">(</span><span class="s1">&#39;on&#39;</span> <span class="o">+</span> <span class="nx">type</span><span class="p">,</span> <span class="nx">obj</span><span class="p">[</span><span class="nx">eProp</span><span class="p">]);</span> </span><span id="L-27"><a name="L-27"></a> <span class="nx">obj</span><span class="p">[</span><span class="nx">eProp</span><span class="p">]</span> <span class="o">=</span> <span class="kc">null</span><span class="p">;</span> </span><span id="L-28"><a name="L-28"></a> <span class="nx">obj</span><span class="p">[</span><span class="s2">&quot;e&quot;</span> <span class="o">+</span> <span class="nx">eProp</span><span class="p">]</span> <span class="o">=</span> <span class="kc">null</span><span class="p">;</span> </span><span id="L-29"><a name="L-29"></a> <span class="p">}</span> </span><span id="L-30"><a name="L-30"></a> <span class="p">}</span> </span><span id="L-31"><a name="L-31"></a> </span><span id="L-32"><a name="L-32"></a> <span class="c1">// Return public references to functions/properties</span> </span><span id="L-33"><a name="L-33"></a> <span class="k">return</span> <span class="p">{</span> </span><span id="L-34"><a name="L-34"></a> <span class="nx">addXEvent</span><span class="o">:</span> <span class="nx">_addXEvent</span><span class="p">,</span> </span><span id="L-35"><a name="L-35"></a> <span class="nx">removeXEvent</span><span class="o">:</span> <span class="nx">_removeXEvent</span> </span><span id="L-36"><a name="L-36"></a> <span class="p">}</span> </span><span id="L-37"><a name="L-37"></a> <span class="p">}();</span> </span><span id="L-38"><a name="L-38"></a> </span><span id="L-39"><a name="L-39"></a> <span class="c1">// Get events and add/process handlers</span> </span><span id="L-40"><a name="L-40"></a> <span class="kd">var</span> <span class="nx">MySelector</span> <span class="o">=</span> <span class="nb">document</span><span class="p">.</span><span class="nx">getElementById</span><span class="p">(</span><span class="s2">&quot;SelectorDropdown&quot;</span><span class="p">);</span> </span><span id="L-41"><a name="L-41"></a> <span class="kd">var</span> <span class="nx">MyInput</span> <span class="o">=</span> <span class="nb">document</span><span class="p">.</span><span class="nx">getElementById</span><span class="p">(</span><span class="s2">&quot;InputText&quot;</span><span class="p">);</span> </span><span id="L-42"><a name="L-42"></a> </span><span id="L-43"><a name="L-43"></a> <span class="nx">JShelperFunctions</span><span class="p">.</span><span class="nx">addXEvent</span><span class="p">(</span><span class="nx">MySelector</span><span class="p">,</span> <span class="s2">&quot;change&quot;</span><span class="p">,</span> <span class="kd">function</span> <span class="p">(</span><span class="nx">evt</span><span class="p">)</span> <span class="p">{</span> </span><span id="L-44"><a name="L-44"></a> <span class="nx">console</span><span class="p">.</span><span class="nx">log</span><span class="p">(</span><span class="nx">evt</span><span class="p">);</span> </span><span id="L-45"><a name="L-45"></a> <span class="nx">console</span><span class="p">.</span><span class="nx">log</span><span class="p">(</span><span class="nx">evt</span><span class="p">.</span><span class="nx">srcElement</span><span class="p">.</span><span class="nx">options</span><span class="p">[</span><span class="nx">evt</span><span class="p">.</span><span class="nx">srcElement</span><span class="p">.</span><span class="nx">selectedIndex</span><span class="p">].</span><span class="nx">text</span><span class="p">,</span> <span class="nx">evt</span><span class="p">.</span><span class="nx">srcElement</span><span class="p">.</span><span class="nx">options</span><span class="p">[</span><span class="nx">evt</span><span class="p">.</span><span class="nx">srcElement</span><span class="p">.</span><span class="nx">selectedIndex</span><span class="p">].</span><span class="nx">value</span><span class="p">);</span> </span><span id="L-46"><a name="L-46"></a> <span class="nx">console</span><span class="p">.</span><span class="nx">log</span><span class="p">(</span><span class="nb">window</span><span class="p">.</span><span class="nx">location</span><span class="p">.</span><span class="nx">href</span><span class="p">);</span> </span><span id="L-47"><a name="L-47"></a> <span class="p">});</span> </span><span id="L-48"><a name="L-48"></a> </span><span id="L-49"><a name="L-49"></a> <span class="nx">JShelperFunctions</span><span class="p">.</span><span class="nx">addXEvent</span><span class="p">(</span><span class="nx">MyInput</span><span class="p">,</span> <span class="s2">&quot;change&quot;</span><span class="p">,</span> <span class="kd">function</span> <span class="p">(</span><span class="nx">evt</span><span class="p">)</span> <span class="p">{</span> </span><span id="L-50"><a name="L-50"></a> <span class="nx">console</span><span class="p">.</span><span class="nx">log</span><span class="p">(</span><span class="nx">evt</span><span class="p">);</span> </span><span id="L-51"><a name="L-51"></a> <span class="nx">console</span><span class="p">.</span><span class="nx">log</span><span class="p">(</span><span class="nx">evt</span><span class="p">.</span><span class="nx">srcElement</span><span class="p">.</span><span class="nx">value</span><span class="p">);</span> </span><span id="L-52"><a name="L-52"></a> <span class="p">});</span> </span></pre></div> </td></tr></table>
event-handling, javascript