JavaScript basics 2 drop-down list left and right selection
<span style="color: #008080;"> 1</span> <span style="color: #0000ff;"><!</span><span style="color: #ff00ff;">DOCTYPE html</span><span style="color: #0000ff;">></span>
<span style="color: #008080;"> 2</span> <span style="color: #0000ff;"><</span><span style="color: #800000;">html</span><span style="color: #0000ff;">></span>
<span style="color: #008080;"> 3</span> <span style="color: #0000ff;"><</span><span style="color: #800000;">head</span><span style="color: #0000ff;">></span>
<span style="color: #008080;"> 4</span> <span style="color: #0000ff;"><</span><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><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><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><span style="color: #800000;">body</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">19</span> <span style="color: #0000ff;"><</span><span style="color: #800000;">div</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">20</span> <span style="color: #0000ff;"><</span><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><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><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><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><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><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><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><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><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><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><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><span style="color: #800000;">br </span><span style="color: #0000ff;">/></span>
<span style="color: #008080;">33</span> <span style="color: #0000ff;"><</span><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><span style="color: #800000;">br </span><span style="color: #0000ff;">/></span>
<span style="color: #008080;">35</span> <span style="color: #0000ff;"><</span><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><span style="color: #800000;">div</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">39</span> <span style="color: #0000ff;"><</span><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><span style="color: #800000;">br </span><span style="color: #0000ff;">/></span>
<span style="color: #008080;">41</span> <span style="color: #0000ff;"><</span><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;">="<- 选中添加到左边"</span><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><span style="color: #800000;">br </span><span style="color: #0000ff;">/></span>
<span style="color: #008080;">43</span> <span style="color: #0000ff;"><</span><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;">="<-- 全部添加到左边"</span><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><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><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><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>Copy after login
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The article discusses the HTML <meter> element, used for displaying scalar or fractional values within a range, and its common applications in web development. It differentiates <meter> from <progress> and ex
What is an example of a starting tag in HTML?
Apr 06, 2025 am 12:04 AM
AnexampleofastartingtaginHTMLis,whichbeginsaparagraph.StartingtagsareessentialinHTMLastheyinitiateelements,definetheirtypes,andarecrucialforstructuringwebpagesandconstructingtheDOM.
Understanding HTML, CSS, and JavaScript: A Beginner's Guide
Apr 12, 2025 am 12:02 AM
WebdevelopmentreliesonHTML,CSS,andJavaScript:1)HTMLstructurescontent,2)CSSstylesit,and3)JavaScriptaddsinteractivity,formingthebasisofmodernwebexperiences.
Gitee Pages static website deployment failed: How to troubleshoot and resolve single file 404 errors?
Apr 04, 2025 pm 11:54 PM
GiteePages static website deployment failed: 404 error troubleshooting and resolution when using Gitee...
