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JavaScript basics 2 drop-down list left and right selection

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Sep 12, 2016 pm 05:27 PM

<span style="color: #008080;"> 1</span> <span style="color: #0000ff;"><span style="color: #ff00ff;">DOCTYPE html</span><span style="color: #0000ff;">></span>
<span style="color: #008080;"> 2</span> <span style="color: #0000ff;"><span style="color: #800000;">html</span><span style="color: #0000ff;">></span>
<span style="color: #008080;"> 3</span>     <span style="color: #0000ff;"><span style="color: #800000;">head</span><span style="color: #0000ff;">></span>
<span style="color: #008080;"> 4</span>         <span style="color: #0000ff;"><span style="color: #800000;">meta </span><span style="color: #ff0000;">charset</span><span style="color: #0000ff;">="UTF-8"</span><span style="color: #0000ff;">></span>
<span style="color: #008080;"> 5</span>         <span style="color: #0000ff;"><span style="color: #800000;">title</span><span style="color: #0000ff;">></span>下拉列表左右选择<span style="color: #0000ff;"></span><span style="color: #800000;">title</span><span style="color: #0000ff;">></span>
<span style="color: #008080;"> 6</span>         <span style="color: #0000ff;"><span style="color: #800000;">style </span><span style="color: #ff0000;">type</span><span style="color: #0000ff;">="text/css"</span><span style="color: #0000ff;">></span>
<span style="color: #008080;"> 7</span> <span style="background-color: #f5f5f5; color: #800000;">            div </span><span style="background-color: #f5f5f5; color: #000000;">{</span>
<span style="color: #008080;"> 8</span> <span style="background-color: #f5f5f5; color: #ff0000;">                width</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 200px</span><span style="background-color: #f5f5f5; color: #000000;">;</span>
<span style="color: #008080;"> 9</span> <span style="background-color: #f5f5f5; color: #ff0000;">                float</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> left</span><span style="background-color: #f5f5f5; color: #000000;">;</span>
<span style="color: #008080;">10</span>             <span style="background-color: #f5f5f5; color: #000000;">}</span>
<span style="color: #008080;">11</span> <span style="background-color: #f5f5f5; color: #800000;">            select </span><span style="background-color: #f5f5f5; color: #000000;">{</span>
<span style="color: #008080;">12</span> <span style="background-color: #f5f5f5; color: #ff0000;">                width</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 100px</span><span style="background-color: #f5f5f5; color: #000000;">;</span>
<span style="color: #008080;">13</span> <span style="background-color: #f5f5f5; color: #ff0000;">                height</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 180px</span><span style="background-color: #f5f5f5; color: #000000;">;</span>
<span style="color: #008080;">14</span> <span style="background-color: #f5f5f5; color: #ff0000;">                padding</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 10px</span><span style="background-color: #f5f5f5; color: #000000;">;</span>
<span style="color: #008080;">15</span>             <span style="background-color: #f5f5f5; color: #000000;">}</span>
<span style="color: #008080;">16</span>         <span style="color: #0000ff;"></span><span style="color: #800000;">style</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">17</span>     <span style="color: #0000ff;"></span><span style="color: #800000;">head</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">18</span>     <span style="color: #0000ff;"><span style="color: #800000;">body</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">19</span>         <span style="color: #0000ff;"><span style="color: #800000;">div</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">20</span>             <span style="color: #0000ff;"><span style="color: #800000;">select </span><span style="color: #ff0000;">multiple</span><span style="color: #0000ff;">="multiple"</span><span style="color: #ff0000;"> id</span><span style="color: #0000ff;">="leftSel"</span><span style="color: #ff0000;"> style</span><span style="color: #0000ff;">="margin-left: 17px;"</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">21</span>                 <span style="color: #0000ff;"><span style="color: #800000;">option</span><span style="color: #0000ff;">></span>选项1<span style="color: #0000ff;"></span><span style="color: #800000;">option</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">22</span>                 <span style="color: #0000ff;"><span style="color: #800000;">option</span><span style="color: #0000ff;">></span>选项2<span style="color: #0000ff;"></span><span style="color: #800000;">option</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">23</span>                 <span style="color: #0000ff;"><span style="color: #800000;">option</span><span style="color: #0000ff;">></span>选项3<span style="color: #0000ff;"></span><span style="color: #800000;">option</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">24</span>                 <span style="color: #0000ff;"><span style="color: #800000;">option</span><span style="color: #0000ff;">></span>选项4<span style="color: #0000ff;"></span><span style="color: #800000;">option</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">25</span>                 <span style="color: #0000ff;"><span style="color: #800000;">option</span><span style="color: #0000ff;">></span>选项5<span style="color: #0000ff;"></span><span style="color: #800000;">option</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">26</span>                 <span style="color: #0000ff;"><span style="color: #800000;">option</span><span style="color: #0000ff;">></span>选项6<span style="color: #0000ff;"></span><span style="color: #800000;">option</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">27</span>                 <span style="color: #0000ff;"><span style="color: #800000;">option</span><span style="color: #0000ff;">></span>选项7<span style="color: #0000ff;"></span><span style="color: #800000;">option</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">28</span>                 <span style="color: #0000ff;"><span style="color: #800000;">option</span><span style="color: #0000ff;">></span>选项8<span style="color: #0000ff;"></span><span style="color: #800000;">option</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">29</span>                 <span style="color: #0000ff;"><span style="color: #800000;">option</span><span style="color: #0000ff;">></span>选项9<span style="color: #0000ff;"></span><span style="color: #800000;">option</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">30</span>                 <span style="color: #0000ff;"><span style="color: #800000;">option</span><span style="color: #0000ff;">></span>选项10<span style="color: #0000ff;"></span><span style="color: #800000;">option</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">31</span>             <span style="color: #0000ff;"></span><span style="color: #800000;">select</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">32</span>             <span style="color: #0000ff;"><span style="color: #800000;">br </span><span style="color: #0000ff;">/></span>
<span style="color: #008080;">33</span>             <span style="color: #0000ff;"><span style="color: #800000;">input </span><span style="color: #ff0000;">type</span><span style="color: #0000ff;">="button"</span><span style="color: #ff0000;"> value</span><span style="color: #0000ff;">="选中添加到右边 ->"</span><span style="color: #ff0000;"> onclick</span><span style="color: #0000ff;">="choiceToRight()"</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">34</span>             <span style="color: #0000ff;"><span style="color: #800000;">br </span><span style="color: #0000ff;">/></span>
<span style="color: #008080;">35</span>             <span style="color: #0000ff;"><span style="color: #800000;">input </span><span style="color: #ff0000;">type</span><span style="color: #0000ff;">="button"</span><span style="color: #ff0000;"> value</span><span style="color: #0000ff;">="全部添加到右边 -->"</span><span style="color: #ff0000;"> onclick</span><span style="color: #0000ff;">="allToRight()"</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">36</span>         <span style="color: #0000ff;"></span><span style="color: #800000;">div</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">37</span>         
<span style="color: #008080;">38</span>         <span style="color: #0000ff;"><span style="color: #800000;">div</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">39</span>             <span style="color: #0000ff;"><span style="color: #800000;">select </span><span style="color: #ff0000;">multiple</span><span style="color: #0000ff;">="multiple"</span><span style="color: #ff0000;"> id</span><span style="color: #0000ff;">="rightSel"</span><span style="color: #ff0000;"> style</span><span style="color: #0000ff;">="margin-left: 17px;"</span><span style="color: #0000ff;">></span><span style="color: #800000;">select</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">40</span>             <span style="color: #0000ff;"><span style="color: #800000;">br </span><span style="color: #0000ff;">/></span>
<span style="color: #008080;">41</span>             <span style="color: #0000ff;"><span style="color: #800000;">input </span><span style="color: #ff0000;">type</span><span style="color: #0000ff;">="button"</span><span style="color: #ff0000;"> value</span><span style="color: #0000ff;">="<span style="color: #ff0000;"> onclick</span><span style="color: #0000ff;">="choiceToLeft()"</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">42</span>             <span style="color: #0000ff;"><span style="color: #800000;">br </span><span style="color: #0000ff;">/></span>
<span style="color: #008080;">43</span>             <span style="color: #0000ff;"><span style="color: #800000;">input </span><span style="color: #ff0000;">type</span><span style="color: #0000ff;">="button"</span><span style="color: #ff0000;"> value</span><span style="color: #0000ff;">="<span style="color: #ff0000;"> onclick</span><span style="color: #0000ff;">="allToLeft()"</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">44</span>         <span style="color: #0000ff;"></span><span style="color: #800000;">div</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">45</span>     
<span style="color: #008080;">46</span>         <span style="color: #0000ff;"><span style="color: #800000;">script </span><span style="color: #ff0000;">type</span><span style="color: #0000ff;">="text/javascript"</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">47</span>             <span style="background-color: #f5f5f5; color: #008000;">//</span><span style="background-color: #f5f5f5; color: #008000;"> 获取select</span>
<span style="color: #008080;">48</span>             <span style="background-color: #f5f5f5; color: #0000ff;">var</span><span style="background-color: #f5f5f5; color: #000000;"> leftSel </span><span style="background-color: #f5f5f5; color: #000000;">=</span><span style="background-color: #f5f5f5; color: #000000;"> document.getElementById(</span><span style="background-color: #f5f5f5; color: #000000;">"</span><span style="background-color: #f5f5f5; color: #000000;">leftSel</span><span style="background-color: #f5f5f5; color: #000000;">"</span><span style="background-color: #f5f5f5; color: #000000;">);
</span><span style="color: #008080;">49</span>             <span style="background-color: #f5f5f5; color: #0000ff;">var</span><span style="background-color: #f5f5f5; color: #000000;"> rightSel </span><span style="background-color: #f5f5f5; color: #000000;">=</span><span style="background-color: #f5f5f5; color: #000000;"> document.getElementById(</span><span style="background-color: #f5f5f5; color: #000000;">"</span><span style="background-color: #f5f5f5; color: #000000;">rightSel</span><span style="background-color: #f5f5f5; color: #000000;">"</span><span style="background-color: #f5f5f5; color: #000000;">);
</span><span style="color: #008080;">50</span>             <span style="background-color: #f5f5f5; color: #008000;">//</span><span style="background-color: #f5f5f5; color: #008000;"> 选中添加到右边</span>
<span style="color: #008080;">51</span>             <span style="background-color: #f5f5f5; color: #0000ff;">function</span><span style="background-color: #f5f5f5; color: #000000;"> choiceToRight() {
</span><span style="color: #008080;">52</span> <span style="background-color: #f5f5f5; color: #000000;">                toSel(leftSel, rightSel, </span><span style="background-color: #f5f5f5; color: #0000ff;">true</span><span style="background-color: #f5f5f5; color: #000000;">);
</span><span style="color: #008080;">53</span> <span style="background-color: #f5f5f5; color: #000000;">            }
</span><span style="color: #008080;">54</span>             <span style="background-color: #f5f5f5; color: #008000;">//</span><span style="background-color: #f5f5f5; color: #008000;"> 全部添加到右边</span>
<span style="color: #008080;">55</span>             <span style="background-color: #f5f5f5; color: #0000ff;">function</span><span style="background-color: #f5f5f5; color: #000000;"> allToRight() {
</span><span style="color: #008080;">56</span> <span style="background-color: #f5f5f5; color: #000000;">                toSel(leftSel, rightSel, </span><span style="background-color: #f5f5f5; color: #0000ff;">false</span><span style="background-color: #f5f5f5; color: #000000;">);
</span><span style="color: #008080;">57</span> <span style="background-color: #f5f5f5; color: #000000;">            }
</span><span style="color: #008080;">58</span>             <span style="background-color: #f5f5f5; color: #008000;">//</span><span style="background-color: #f5f5f5; color: #008000;"> 选中添加到左边</span>
<span style="color: #008080;">59</span>             <span style="background-color: #f5f5f5; color: #0000ff;">function</span><span style="background-color: #f5f5f5; color: #000000;"> choiceToLeft() {
</span><span style="color: #008080;">60</span> <span style="background-color: #f5f5f5; color: #000000;">                toSel(rightSel, leftSel, </span><span style="background-color: #f5f5f5; color: #0000ff;">true</span><span style="background-color: #f5f5f5; color: #000000;">);
</span><span style="color: #008080;">61</span> <span style="background-color: #f5f5f5; color: #000000;">            }
</span><span style="color: #008080;">62</span>             <span style="background-color: #f5f5f5; color: #008000;">//</span><span style="background-color: #f5f5f5; color: #008000;"> 全部添加到左边</span>
<span style="color: #008080;">63</span>             <span style="background-color: #f5f5f5; color: #0000ff;">function</span><span style="background-color: #f5f5f5; color: #000000;"> allToLeft() {
</span><span style="color: #008080;">64</span> <span style="background-color: #f5f5f5; color: #000000;">                toSel(rightSel, leftSel, </span><span style="background-color: #f5f5f5; color: #0000ff;">false</span><span style="background-color: #f5f5f5; color: #000000;">);
</span><span style="color: #008080;">65</span> <span style="background-color: #f5f5f5; color: #000000;">            }
</span><span style="color: #008080;">66</span>             <span style="background-color: #f5f5f5; color: #008000;">//</span><span style="background-color: #f5f5f5; color: #008000;"> 如果flag为true，就是选中添加，如果为false，就是全部添加</span>
<span style="color: #008080;">67</span>             <span style="background-color: #f5f5f5; color: #0000ff;">function</span><span style="background-color: #f5f5f5; color: #000000;"> toSel(fromSel, toSel, flag) {
</span><span style="color: #008080;">68</span>                 <span style="background-color: #f5f5f5; color: #0000ff;">var</span><span style="background-color: #f5f5f5; color: #000000;"> subSel </span><span style="background-color: #f5f5f5; color: #000000;">=</span><span style="background-color: #f5f5f5; color: #000000;"> fromSel.getElementsByTagName(</span><span style="background-color: #f5f5f5; color: #000000;">"</span><span style="background-color: #f5f5f5; color: #000000;">option</span><span style="background-color: #f5f5f5; color: #000000;">"</span><span style="background-color: #f5f5f5; color: #000000;">);
</span><span style="color: #008080;">69</span>                 <span style="background-color: #f5f5f5; color: #0000ff;">if</span><span style="background-color: #f5f5f5; color: #000000;"> (flag) {
</span><span style="color: #008080;">70</span>                     <span style="background-color: #f5f5f5; color: #0000ff;">for</span><span style="background-color: #f5f5f5; color: #000000;"> (</span><span style="background-color: #f5f5f5; color: #0000ff;">var</span><span style="background-color: #f5f5f5; color: #000000;"> i </span><span style="background-color: #f5f5f5; color: #000000;">=</span> <span style="background-color: #f5f5f5; color: #000000;">0</span><span style="background-color: #f5f5f5; color: #000000;">; i </span><span style="background-color: #f5f5f5; color: #000000;"><span style="background-color: #f5f5f5; color: #000000;"> subSel.length; i</span><span style="background-color: #f5f5f5; color: #000000;">++</span><span style="background-color: #f5f5f5; color: #000000;">) {
</span><span style="color: #008080;">71</span>                         <span style="background-color: #f5f5f5; color: #0000ff;">if</span><span style="background-color: #f5f5f5; color: #000000;"> (subSel[i].selected) {
</span><span style="color: #008080;">72</span> <span style="background-color: #f5f5f5; color: #000000;">                            toSel.appendChild(subSel[i]);
</span><span style="color: #008080;">73</span>                             <span style="background-color: #f5f5f5; color: #008000;">//</span><span style="background-color: #f5f5f5; color: #008000;"> 因为subSel的length每次会-1，所以让i归零，保证每次for循环都能被执行到</span>
<span style="color: #008080;">74</span> <span style="background-color: #f5f5f5; color: #000000;">                            i</span><span style="background-color: #f5f5f5; color: #000000;">--</span><span style="background-color: #f5f5f5; color: #000000;">;
</span><span style="color: #008080;">75</span> <span style="background-color: #f5f5f5; color: #000000;">                        }
</span><span style="color: #008080;">76</span> <span style="background-color: #f5f5f5; color: #000000;">                    }
</span><span style="color: #008080;">77</span> <span style="background-color: #f5f5f5; color: #000000;">                } </span><span style="background-color: #f5f5f5; color: #0000ff;">else</span><span style="background-color: #f5f5f5; color: #000000;"> {
</span><span style="color: #008080;">78</span>                     <span style="background-color: #f5f5f5; color: #0000ff;">for</span><span style="background-color: #f5f5f5; color: #000000;"> (</span><span style="background-color: #f5f5f5; color: #0000ff;">var</span><span style="background-color: #f5f5f5; color: #000000;"> i </span><span style="background-color: #f5f5f5; color: #000000;">=</span> <span style="background-color: #f5f5f5; color: #000000;">0</span><span style="background-color: #f5f5f5; color: #000000;">; i </span><span style="background-color: #f5f5f5; color: #000000;"><span style="background-color: #f5f5f5; color: #000000;"> subSel.length; i</span><span style="background-color: #f5f5f5; color: #000000;">++</span><span style="background-color: #f5f5f5; color: #000000;">) {
</span><span style="color: #008080;">79</span> <span style="background-color: #f5f5f5; color: #000000;">                        toSel.appendChild(subSel[i]);
</span><span style="color: #008080;">80</span> <span style="background-color: #f5f5f5; color: #000000;">                        i</span><span style="background-color: #f5f5f5; color: #000000;">--</span><span style="background-color: #f5f5f5; color: #000000;">;
</span><span style="color: #008080;">81</span> <span style="background-color: #f5f5f5; color: #000000;">                    }
</span><span style="color: #008080;">82</span> <span style="background-color: #f5f5f5; color: #000000;">                }
</span><span style="color: #008080;">83</span> <span style="background-color: #f5f5f5; color: #000000;">            }
</span><span style="color: #008080;">84</span>         <span style="color: #0000ff;"></span><span style="color: #800000;">script</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">85</span>     <span style="color: #0000ff;"></span><span style="color: #800000;">body</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">86</span> <span style="color: #0000ff;"></span><span style="color: #800000;">html</span><span style="color: #0000ff;">></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>

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Setting the lang attributes of a tag is a key step in optimizing web accessibility and SEO. 1) Set the lang attribute in the tag, such as. 2) In multilingual content, set lang attributes for different language parts, such as. 3) Use language codes that comply with ISO639-1 standards, such as "en", "fr", "zh", etc. Correctly setting the lang attribute can improve the accessibility of web pages and search engine rankings.

What is the purpose of HTML attributes?May 07, 2025 am 12:01 AM

HTMLattributesareessentialforenhancingwebelements'functionalityandappearance.Theyaddinformationtodefinebehavior,appearance,andinteraction,makingwebsitesinteractive,responsive,andvisuallyappealing.Attributeslikesrc,href,class,type,anddisabledtransform

How do you create a list in HTML?May 06, 2025 am 12:01 AM

TocreatealistinHTML,useforunorderedlistsandfororderedlists:1)Forunorderedlists,wrapitemsinanduseforeachitem,renderingasabulletedlist.2)Fororderedlists,useandfornumberedlists,customizablewiththetypeattributefordifferentnumberingstyles.

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