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typeError:form.serialize不是函数-我缺少什么

[英]typeError: form.serialize is not a function - What am I missing

我不确定我缺少什么,但是这段代码抛出一个typeError:form.serialize不是一个函数

$('#paragraphsList').on('change', 'input', function (e) {
    e.preventDefault();
    var form = this.closest("form");
    console.log(form);
    console.log(form.serialize());

表单是动态创建的,但是form变量的console.log输出显示它正在查找正确的表单。

<ul id="paragraphsList">
<--dynamicaly generated content begins here-->
    <li>
        <form class="paragraphForm" name="80" id="80">
            <input id="81" name="activity"  value="a" class="paragraphs">
            <input id="82" name="task"      value="b" class="paragraphs">
            <input id="83" name="pStyle"    value="c" class="paragraphs">
            <input id="84" name="pContent"  value="d" class="paragraphs,style2">
        </form>
    </li>
    <li>
        <form class="paragraphForm" name="85" id="85">
            <input id="86" name="activity"  value="a" class="paragraphs">
            <input id="87" name="task"      value="b" class="paragraphs">
            <input id="88" name="pStyle"    value="c" class="paragraphs">
            <input id="89" name="pContent"  value="d" class="paragraphs,style2">
        </form>
    </li>
    .....

抱歉,更新太晚了。...这是一个完整的页面,演示了该问题。 如果您查看控制台输出,则on-change显然是在正确的位置被调用的,并且具有正确的form对象,但是序列化调用仍然失败。

<!DOCTYPE html>
<html>

<head>
    <title>Test</title>
</head>

<body>
    <p onclick="load()">Load Forms</p>
    <ul id="paragraphsList">

    </ul>

</body>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
<script>
function load() {
    $('#paragraphsList').empty();
    $('#paragraphsList').append(newForm("A", "step1", "task1", "myStyle1", "myContent1"));
    $('#paragraphsList').append(newForm("b", "step2", "task2", "myStyle2", "myContent2"));
    $('#paragraphsList').append(newForm("c", "step3", "task3", "myStyle3", "myContent3"));
    $('#paragraphsList').append(newForm("d", "step4", "task4", "myStyle4", "myContent4"));
}

function newForm(id, activity, task, pStyle, pContent) {
    var li = $('<li></li>');
    var form = $("<form></form>");
    form.attr("class", "paragraphForm");
    form.attr("name", id);
    form.attr("id", id);
    form.append(newField(id, "activity",    activity,   "paragraphs", "data" ));
    form.append(newField(id, "task",        task,       "paragraphs", "data" ));
    form.append(newField(id, "pStyle",      pStyle,     "paragraphs", "data" ));
    form.append(newField(id, "pContent",    pContent,   "paragraphs," + pStyle, "data"));
    form.change(function () {
        console.log(this);
        console.log(this.serialize());
    });
    li.append(form);
    return li;
}

function newField(id, name, value, style) {
    var input = $("<input>");
    input.attr("id", id + "." + name);
    input.attr("name", name);
    input.attr("value", value);
    input.attr("class", style);
    return input;
}

</script>
</html>

您正在使用的ID选择paragraphsList ,这是你的表格上失踪。 -啊,如果您证明它是摘要中的父项,那就太好了。

我认为您需要选择输入字段,然后在其上调用“单击”。 这样,“ this”将引用输入字段,而不是表单的容器。

$('#paragraphsList > form > input') 

可以解决此问题,如jquery serialize文档中所述:

$( ".paragraphForm" ).on( "change", function( event ) {
  event.preventDefault();
  console.log( $( this ).serialize() );
});

https://api.jquery.com/serialize/

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>serialize demo</title>
  <style>
  body, select {
    font-size: 12px;
  }
  form {
    margin: 5px;
  }
  p {
    color: red;
    margin: 5px;
    font-size: 14px;
  }
  b {
    color: blue;
  }
  </style>
  <script src="https://code.jquery.com/jquery-1.10.2.js"></script>
</head>
<body>

<form>
  <select name="single">
    <option>Single</option>
    <option>Single2</option>
  </select>

  <br>
  <select name="multiple" multiple="multiple">
    <option selected="selected">Multiple</option>
    <option>Multiple2</option>
    <option selected="selected">Multiple3</option>
  </select>

  <br>
  <input type="checkbox" name="check" value="check1" id="ch1">
  <label for="ch1">check1</label>
  <input type="checkbox" name="check" value="check2" checked="checked" id="ch2">
  <label for="ch2">check2</label>

  <br>
  <input type="radio" name="radio" value="radio1" checked="checked" id="r1">
  <label for="r1">radio1</label>
  <input type="radio" name="radio" value="radio2" id="r2">
  <label for="r2">radio2</label>
</form>

<p><tt id="results"></tt></p>

<script>
  function showValues() {
    var str = $( "form" ).serialize();
    $( "#results" ).text( str );
  }
  $( "input[type='checkbox'], input[type='radio']" ).on( "click", showValues );
  $( "select" ).on( "change", showValues );
  showValues();
</script>

</body>
</html>

上面的变量“ form”是“常规”对象,而不是DOM对象。 此代码有效

console.log($(form).serialize());

当我希望它是一个DOM对象时,显然this.closest('form')返回一个常规对象。 对于this$(this)之间的区别以及为什么this.closest(“ form”)的响应不是DOM对象,我仍然感到困惑。 对此主题的任何澄清表示赞赏。

准备好聆听动态内容

<ul id="paragraphsList">

</ul>


$(document).ready(function () {
    var form = $('<li><form class="paragraphForm" id="form1" name="80" id="80"><input id="81" name="activity"  value="a" class="paragraphs"><input id="82" name="task"      value="b" class="paragraphs"><input id="83" name="pStyle"    value="c" class="paragraphs"><input id="84" name="pContent"  value="d" class="paragraphs,style2"></form></li>');
    $('#paragraphsList').append(form);
    $("input").click(function () {
        alert('you clicked me');
        console.log($('form').serialize());
    });
});

这是动态创建的内容并正在监听click事件。

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