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 using HTML5 form validation attributes like required, pattern, min, max, and length limits to validate user input directly in the browser.
What are the best practices for cross-browser compatibility in HTML5?
Mar 17, 2025 pm 12:20 PM
Article discusses best practices for ensuring HTML5 cross-browser compatibility, focusing on feature detection, progressive enhancement, and testing methods.
How to efficiently add stroke effects to PNG images on web pages?
Mar 04, 2025 pm 02:39 PM
This article demonstrates efficient PNG border addition to webpages using CSS. It argues that CSS offers superior performance compared to JavaScript or libraries, detailing how to adjust border width, style, and color for subtle or prominent effect
What is the purpose of the <datalist> element?
Mar 21, 2025 pm 12:33 PM
The article discusses the HTML <datalist> element, which enhances forms by providing autocomplete suggestions, improving user experience and reducing errors.Character count: 159
What is the purpose of the <progress> element?
Mar 21, 2025 pm 12:34 PM
The article discusses the HTML <progress> element, its purpose, styling, and differences from the <meter> element. The main focus is on using <progress> for task completion and <meter> for stati
How do I use the HTML5 <time> element to represent dates and times semantically?
Mar 12, 2025 pm 04:05 PM
This article explains the HTML5 <time> element for semantic date/time representation. It emphasizes the importance of the datetime attribute for machine readability (ISO 8601 format) alongside human-readable text, boosting accessibilit
What is the purpose of the <meter> element?
Mar 21, 2025 pm 12:35 PM
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
