JavaScript基础2下拉列表左右选择
<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>Copier après la connexion
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L'article traite du HTML & lt; Datalist & GT; élément, qui améliore les formulaires en fournissant des suggestions de saisie semi-automatique, en améliorant l'expérience utilisateur et en réduisant les erreurs. COMMANDE COMPRES: 159
Quel est le but du & lt; mètre & gt; élément?
Mar 21, 2025 pm 12:35 PM
L'article traite du HTML & lt; mètre & gt; élément, utilisé pour afficher des valeurs scalaires ou fractionnaires dans une plage, et ses applications courantes dans le développement Web. Il différencie & lt; mètre & gt; De & lt; Progress & gt; et ex
Quelles sont les meilleures pratiques pour la compatibilité entre les navigateurs dans HTML5?
Mar 17, 2025 pm 12:20 PM
L'article examine les meilleures pratiques pour assurer la compatibilité des navigateurs de HTML5, en se concentrant sur la détection des fonctionnalités, l'amélioration progressive et les méthodes de test.
Comment utiliser les attributs de validation du formulaire HTML5 pour valider l'entrée utilisateur?
Mar 17, 2025 pm 12:27 PM
L'article discute de l'utilisation des attributs de validation de formulaire HTML5 comme les limites requises, motifs, min, max et longueurs pour valider la saisie de l'utilisateur directement dans le navigateur.
Quelle est la balise Meta de la fenêtre? Pourquoi est-ce important pour une conception réactive?
Mar 20, 2025 pm 05:56 PM
L'article traite de la balise Meta de la fenêtre, essentielle pour la conception Web réactive sur les appareils mobiles. Il explique comment une utilisation appropriée garantit une mise à l'échelle optimale du contenu et une interaction utilisateur, tandis que la mauvaise utilisation peut entraîner des problèmes de conception et d'accessibilité.
Comment utiliser le html5 & lt; time & gt; élément pour représenter les dates et les temps sémantiquement?
Mar 12, 2025 pm 04:05 PM
Cet article explique le html5 & lt; time & gt; élément de représentation sémantique de date / heure. Il souligne l'importance de l'attribut DateTime pour la lisibilité à la machine (format ISO 8601) à côté du texte lisible par l'homme, stimulant AccessIbilit
Quel est le but du & lt; iframe & gt; étiqueter? Quelles sont les considérations de sécurité lorsque vous l'utilisez?
Mar 20, 2025 pm 06:05 PM
L'article traite du & lt; iframe & gt; L'objectif de Tag dans l'intégration du contenu externe dans les pages Web, ses utilisations courantes, ses risques de sécurité et ses alternatives telles que les balises d'objet et les API.
