①Notes diverses : auparavant, il y avait le JavaScript original pour implémenter ajax, ici il existe un moyen plus simple d'implémenter ajax
②Paramètres communs de la méthode $.get()
Paramètres | Tapez | Description | |||||||||||||||
url | Chaîne | Obligatoire, précisez l'adresse d'envoi | |||||||||||||||
données | PlainObject ou String | Facultatif, précise les données envoyées par la requête | |||||||||||||||
succès |
String textStatus,jqXHR jqxhr)
|
Facultatif, fonction à appeler après succès
Données de paramètres : résultat de retour facultatif du serveur
Paramètre textStatus : description facultative du statut de la demande Paramètre jqxhr : facultatif est un surensemble de XMLHttpRequest (obligatoire si dataType est spécifié)
|
|||||||||||||||
Type de données | Chaîne | Facultatif : le type de données qui devrait être renvoyé par le serveur |
1. Partie mot (mots courants JSON)
1.load charge 2.sérialise la sérialisation 3.contient 4.fonctionnalités
5.quote 6.skip 7.transient 8.pretty
9.prototype prototype 10.conflit conflit
2. Quelques questions courantes sur JSON
1. La principale méthode d'implémentation d'Ajax avec jQuery
①Mise en œuvre écologique originale
②Méthodes $.get() et $.post()
Méthode ③$.getJSON()
④.load()
2.jQuery analyse les données du formulaire
La méthode .serializeArray() de jQuery détectera les contrôles valides à partir d'un ensemble d'éléments de formulaire :
①L'élément ne peut pas être désactivé
②L'élément doit avoir un attribut de nom
③La case cochée est valide④La radio sélectionnée est valide
<span style="color: #008080"> 1</span> <span style="color: #000000">$(function(){ </span><span style="color: #008080"> 2</span> $(<span style="color: #800000">"</span><span style="color: #800000">#email</span><span style="color: #800000">"</span><span style="color: #000000">).blur(function(){ </span><span style="color: #008080"> 3</span> <span style="color: #0000ff">var</span> email=$(<span style="color: #800000">"</span><span style="color: #800000">#email</span><span style="color: #800000">"</span><span style="color: #000000">).val(); </span><span style="color: #008080"> 4</span> <span style="color: #0000ff">if</span>(email==<span style="color: #0000ff">null</span> || email==<span style="color: #800000">""</span><span style="color: #000000">){ </span><span style="color: #008080"> 5</span> $(<span style="color: #800000">"</span><span style="color: #800000">#samp</span><span style="color: #800000">"</span>).html(<span style="color: #800000">"</span><span style="color: #800000">邮箱不能为空!</span><span style="color: #800000">"</span><span style="color: #000000">); </span><span style="color: #008080"> 6</span> <span style="color: #000000"> } </span><span style="color: #008080"> 7</span> <span style="color: #0000ff">else</span><span style="color: #000000">{ </span><span style="color: #008080"> 8</span> $.<span style="color: #0000ff">get</span>(<span style="color: #800000">"</span><span style="color: #800000">userServlet</span><span style="color: #800000">"</span>,<span style="color: #800000">"</span><span style="color: #800000">email=</span><span style="color: #800000">"</span>+<span style="color: #000000">email,callBack); </span><span style="color: #008080"> 9</span> <span style="color: #000000"> function callBack(data){ </span><span style="color: #008080">10</span> <span style="color: #0000ff">if</span>(data==<span style="color: #800000">"</span><span style="color: #800000">true</span><span style="color: #800000">"</span><span style="color: #000000">){ </span><span style="color: #008080">11</span> $(<span style="color: #800000">"</span><span style="color: #800000">#samp</span><span style="color: #800000">"</span>).html(<span style="color: #800000">"</span><span style="color: #800000">邮箱已被注册!</span><span style="color: #800000">"</span><span style="color: #000000">); </span><span style="color: #008080">12</span> <span style="color: #000000"> } </span><span style="color: #008080">13</span> <span style="color: #0000ff">else</span><span style="color: #000000">{ </span><span style="color: #008080">14</span> $(<span style="color: #800000">"</span><span style="color: #800000">#samp</span><span style="color: #800000">"</span>).html(<span style="color: #800000">"</span><span style="color: #800000">邮箱可注册!</span><span style="color: #800000">"</span><span style="color: #000000">); </span><span style="color: #008080">15</span> <span style="color: #000000"> } </span><span style="color: #008080">16</span> <span style="color: #000000"> } </span><span style="color: #008080">17</span> <span style="color: #000000"> } </span><span style="color: #008080">18</span> <span style="color: #000000"> }); </span><span style="color: #008080">19</span> <span style="color: #008080">20</span> });
⑥l'élément de fichier ne sera pas sérialisé
<span style="color: #008080"> 1</span> $.getJSON("userServlet","por=top"<span style="color: #000000">,callTopics); </span><span style="color: #008080"> 2</span> <span style="color: #008080"> 3</span> <span style="color: #0000ff">function</span><span style="color: #000000"> callTopics(top){ </span><span style="color: #008080"> 4</span> <span style="color: #008080"> 5</span> <span style="color: #0000ff">var</span> $userul=$("#userul"<span style="color: #000000">).empty(); </span><span style="color: #008080"> 6</span> <span style="color: #0000ff">for</span>(<span style="color: #0000ff">var</span> i=0;i<<span style="color: #000000">top.length;){ </span><span style="color: #008080"> 7</span> <span style="color: #008000">//</span><span style="color: #008000">alert("ddd");</span> <span style="color: #008080"> 8</span> <span style="color: #000000"> $userul.append( </span><span style="color: #008080"> 9</span> "<li>"+top[i].topics+" <a href=''>修改</a> <a href=''>删除</a></li>" <span style="color: #008080">10</span> <span style="color: #000000"> ); </span><span style="color: #008080">11</span> i++<span style="color: #000000">; </span><span style="color: #008080">12</span> <span style="color: #0000ff">if</span>(i==<span style="color: #000000">top.length){ </span><span style="color: #008080">13</span> <span style="color: #008080">14</span> <span style="color: #0000ff">break</span><span style="color: #000000">; </span><span style="color: #008080">15</span> <span style="color: #000000"> } </span><span style="color: #008080">16</span> <span style="color: #000000"> } </span><span style="color: #008080">17</span> }
3. Implémenter Ajax
<span style="color: #008080"> 1</span> <span style="color: #000000">$.ajax({ </span><span style="color: #008080"> 2</span> "url":"userServlet"<span style="color: #000000">, </span><span style="color: #008080"> 3</span> "type":"GET"<span style="color: #000000">, </span><span style="color: #008080"> 4</span> "data":"por=top1"<span style="color: #000000">, </span><span style="color: #008080"> 5</span> "dataType":"html"<span style="color: #000000">, </span><span style="color: #008080"> 6</span> "success"<span style="color: #000000">:callTopics </span><span style="color: #008080"> 7</span> <span style="color: #000000">}); </span><span style="color: #008080"> 8</span> <span style="color: #0000ff">function</span><span style="color: #000000"> callTopics(data){ </span><span style="color: #008080"> 9</span> $("#userul"<span style="color: #000000">).html(data); </span><span style="color: #008080">10</span> }
$("#userul").load("userServlet","por=top1");
<span style="color: #008080"> 1</span> <span style="color: #0000ff">if</span>(por.equals("addCom"<span style="color: #000000">)){ </span><span style="color: #008080"> 2</span> <span style="color: #008000">//</span><span style="color: #008000">上机5添加评论</span> <span style="color: #008080"> 3</span> comment com=<span style="color: #0000ff">new</span><span style="color: #000000"> comment(); </span><span style="color: #008080"> 4</span> commentdao comdao=<span style="color: #0000ff">new</span><span style="color: #000000"> commentimpl(); </span><span style="color: #008080"> 5</span> String name=request.getParameter("cauthor1"<span style="color: #000000">); </span><span style="color: #008080"> 6</span> String ip=request.getParameter("cip"<span style="color: #000000">); </span><span style="color: #008080"> 7</span> String content=request.getParameter("ccontent"<span style="color: #000000">); </span><span style="color: #008080"> 8</span> String ctime="2017-7-4"<span style="color: #000000">; </span><span style="color: #008080"> 9</span> <span style="color: #008000">//</span><span style="color: #008000">time.toString();</span> <span style="color: #008080">10</span> <span style="color: #000000"> com.setCname(name); </span><span style="color: #008080">11</span> <span style="color: #000000"> com.setCcontent(content); </span><span style="color: #008080">12</span> <span style="color: #000000"> com.setCip(ip); </span><span style="color: #008080">13</span> <span style="color: #000000"> com.setCtime(ctime); </span><span style="color: #008080">14</span> <span style="color: #0000ff">int</span> re=<span style="color: #000000">comdao.addcomment(com); </span><span style="color: #008080">15</span> String result=""<span style="color: #000000">; </span><span style="color: #008080">16</span> <span style="color: #0000ff">if</span>(re>0<span style="color: #000000">){ </span><span style="color: #008080">17</span> result="success"<span style="color: #000000">; </span><span style="color: #008080">18</span> }<span style="color: #0000ff">else</span><span style="color: #000000"> { </span><span style="color: #008080">19</span> result="添加失败!"<span style="color: #000000">; </span><span style="color: #008080">20</span> <span style="color: #000000"> } </span><span style="color: #008080">21</span> <span style="color: #008080">22</span> <span style="color: #008080">23</span> response.setContentType("text/html;charset=UTF-8"<span style="color: #000000">); </span><span style="color: #008080">24</span> PrintWriter out=<span style="color: #000000">response.getWriter(); </span><span style="color: #008080">25</span> out.print("[{\"result\":\""+result+"\",\"ctime\":\""+ctime+"\"}]"<span style="color: #000000">); </span><span style="color: #008080">26</span> <span style="color: #000000"> out.flush(); </span><span style="color: #008080">27</span> <span style="color: #000000"> out.close(); </span><span style="color: #008080">28</span> <span style="color: #008080">29</span> }
4. Utilisez la méthode .load() pour charger la liste de sujets générée par le serveur pour la page administrateur
topdao nd=<span style="color: #0000ff">new</span><span style="color: #000000"> topimpl(); List</span><top> listtop=<span style="color: #000000">nd.alltop(); String titleJson</span>=JSON.toJSONStringWithDateFormat(listtop,"yyyy-MM--dd HH:mm:ss");
5. Utilisez Ajax pour implémenter la fonction de commentaires d'actualités sans actualisation
6. Utilisez FastJSON pour transformer la page administrateur afin de charger la liste des thèmes 4. Approfondir la compréhension Le code de chaîne JSON généré par le serveur peut être simplifié grâce à l'API associée de FastJSON La méthode $.parseJSON() est utilisée pour analyser la chaîne de format JSON en objet JSON
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