我的HTML页面说我在页面上使用的对象不存在

发布于 2025-02-10 09:44:23 字数 6003 浏览 1 评论 0原文

我试图将用户名作为我链接中的参数。通过jQuery做到这一点，唯一的问题是我遇到此错误，请注意，在跨度标签上，由于某种原因，对象调用有效。我一直在研究教程，但是当尝试通过$（＃emailTarget）.ATTR（“ id”）获得跨度标签值时，无济于事;并将上述ID放在跨度标签上，它使我具有未定义而不是用户名的价值。

错误堆叠

org.thymeleaf.templateparser.markup.InlinedOutputExpressionMarkupHandler.handleText(InlinedOutputExpressionMarkupHandler.java:80)
    at org.attoparser.HtmlMarkupHandler.handleText(HtmlMarkupHandler.java:208)
    at org.attoparser.AbstractChainedMarkupHandler.handleText(AbstractChainedMarkupHandler.java:203)
    at org.attoparser.MarkupParser.parseBuffer(MarkupParser.java:557)
    at org.attoparser.MarkupParser.parseDocument(MarkupParser.java:301)
    ... 98 more
Caused by: org.thymeleaf.exceptions.TemplateProcessingException: Exception evaluating SpringEL expression: "principal.username" (template: "index" - line 49, col 25)
    at org.thymeleaf.spring5.expression.SPELVariableExpressionEvaluator.evaluate(SPELVariableExpressionEvaluator.java:292)
    at org.thymeleaf.standard.expression.VariableExpression.executeVariableExpression(VariableExpression.java:166)
    at org.thymeleaf.standard.expression.SimpleExpression.executeSimple(SimpleExpression.java:66)
    at org.thymeleaf.standard.expression.Expression.execute(Expression.java:109)
    at org.thymeleaf.standard.expression.Expression.execute(Expression.java:138)
    at org.thymeleaf.standard.processor.AbstractStandardExpressionAttributeTagProcessor.doProcess(AbstractStandardExpressionAttributeTagProcessor.java:144)
    at org.thymeleaf.processor.element.AbstractAttributeTagProcessor.doProcess(AbstractAttributeTagProcessor.java:74)
    at org.thymeleaf.processor.element.AbstractElementTagProcessor.process(AbstractElementTagProcessor.java:95)
    at org.thymeleaf.util.ProcessorConfigurationUtils$ElementTagProcessorWrapper.process(ProcessorConfigurationUtils.java:633)
    at org.thymeleaf.engine.ProcessorTemplateHandler.handleOpenElement(ProcessorTemplateHandler.java:1314)
    at org.thymeleaf.engine.OpenElementTag.beHandled(OpenElementTag.java:205)
    at org.thymeleaf.engine.TemplateModel.process(TemplateModel.java:136)
    at org.thymeleaf.engine.TemplateManager.process(TemplateManager.java:519)
    at org.thymeleaf.util.LazyProcessingCharSequence.writeUnresolved(LazyProcessingCharSequence.java:85)
    at org.thymeleaf.util.AbstractLazyCharSequence.write(AbstractLazyCharSequence.java:103)
    at org.thymeleaf.engine.AbstractTextualTemplateEvent.writeContent(AbstractTextualTemplateEvent.java:224)
    at org.thymeleaf.engine.Text.write(Text.java:78)
    at org.thymeleaf.engine.OutputTemplateHandler.handleText(OutputTemplateHandler.java:71)
    ... 107 more
Caused by: org.springframework.expression.spel.SpelEvaluationException: EL1007E: Property or field 'username' cannot be found on null
    at org.springframework.expression.spel.ast.PropertyOrFieldReference.readProperty(PropertyOrFieldReference.java:213)
    at org.springframework.expression.spel.ast.PropertyOrFieldReference.getValueInternal(PropertyOrFieldReference.java:104)
    at org.springframework.expression.spel.ast.PropertyOrFieldReference.access$000(PropertyOrFieldReference.java:51)

我的主页

<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org"
      xmlns:sec="http://www.thymeleaf.org/thymeleaf-extras-springsecurity3">
    <head>
        <meta charset="ISO-8859-1">
        <title>Registration and Login App</title>

        <link rel="stylesheet"
              href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css"
              integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u"
              crossorigin="anonymous">

    </head>
    <body>
        <!-- create navigation bar ( header) -->
        <nav class="navbar navbar-inverse navbar-fixed-top">
            <div class="container">
                <div class="navbar-header">
                    <button type="button" class="navbar-toggle collapsed"
                            data-toggle="collapse" data-target="#navbar" aria-expanded="false"
                            aria-controls="navbar">
                        <span class="sr-only">Toggle navigation</span> <span
                            class="icon-bar"></span> <span class="icon-bar"></span> <span
                            class="icon-bar"></span>
                    </button>
                    <a class="navbar-brand" href="#" th:href="@{/}">Registration and
                        Login Module</a>
                </div>
                <div id="navbar" class="collapse navbar-collapse">
                    <ul class="nav navbar-nav">
                        <li sec:authorize="isAuthenticated()"><a th:href="@{/logout}">Logout</a></li>
                    </ul>
                </div>
            </div>
        </nav>

        <br>
        <br>

        <div class="container">
            <h1>Registration and Login with Spring Boot, Spring Security,
                Thymeleaf, Hibernate and MySQL</h1>
            Welcome <span sec:authentication="principal.username"> User</span>
        </div>
        <a th:href="login" id="changeMe" class="btn btn-danger">Delete</a>
        <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>

        <script  type="text/javascript" th:inline="javascript">
            let email=[[${principal.username}]];
            $('#changeMe').prop("href", "/delete?email="+email)
        </script>
    </body>
</html>

我的存储库URL： https://github.com/jonathanick.com/jonathanickovich/realaltyking.git.git.git

原文

im trying to put in the username as a parameter in my link. doing this through jquery the only problem is i get this error,note the object call works for some reason on the span tag. I've been looking at tutorials but to no avail when trying to get the span tags value via $(#emailTarget).attr("id"); and putting said id onto the span tag it gives me the value of undefined rather than the username.

error stack

org.thymeleaf.templateparser.markup.InlinedOutputExpressionMarkupHandler.handleText(InlinedOutputExpressionMarkupHandler.java:80)
    at org.attoparser.HtmlMarkupHandler.handleText(HtmlMarkupHandler.java:208)
    at org.attoparser.AbstractChainedMarkupHandler.handleText(AbstractChainedMarkupHandler.java:203)
    at org.attoparser.MarkupParser.parseBuffer(MarkupParser.java:557)
    at org.attoparser.MarkupParser.parseDocument(MarkupParser.java:301)
    ... 98 more
Caused by: org.thymeleaf.exceptions.TemplateProcessingException: Exception evaluating SpringEL expression: "principal.username" (template: "index" - line 49, col 25)
    at org.thymeleaf.spring5.expression.SPELVariableExpressionEvaluator.evaluate(SPELVariableExpressionEvaluator.java:292)
    at org.thymeleaf.standard.expression.VariableExpression.executeVariableExpression(VariableExpression.java:166)
    at org.thymeleaf.standard.expression.SimpleExpression.executeSimple(SimpleExpression.java:66)
    at org.thymeleaf.standard.expression.Expression.execute(Expression.java:109)
    at org.thymeleaf.standard.expression.Expression.execute(Expression.java:138)
    at org.thymeleaf.standard.processor.AbstractStandardExpressionAttributeTagProcessor.doProcess(AbstractStandardExpressionAttributeTagProcessor.java:144)
    at org.thymeleaf.processor.element.AbstractAttributeTagProcessor.doProcess(AbstractAttributeTagProcessor.java:74)
    at org.thymeleaf.processor.element.AbstractElementTagProcessor.process(AbstractElementTagProcessor.java:95)
    at org.thymeleaf.util.ProcessorConfigurationUtils$ElementTagProcessorWrapper.process(ProcessorConfigurationUtils.java:633)
    at org.thymeleaf.engine.ProcessorTemplateHandler.handleOpenElement(ProcessorTemplateHandler.java:1314)
    at org.thymeleaf.engine.OpenElementTag.beHandled(OpenElementTag.java:205)
    at org.thymeleaf.engine.TemplateModel.process(TemplateModel.java:136)
    at org.thymeleaf.engine.TemplateManager.process(TemplateManager.java:519)
    at org.thymeleaf.util.LazyProcessingCharSequence.writeUnresolved(LazyProcessingCharSequence.java:85)
    at org.thymeleaf.util.AbstractLazyCharSequence.write(AbstractLazyCharSequence.java:103)
    at org.thymeleaf.engine.AbstractTextualTemplateEvent.writeContent(AbstractTextualTemplateEvent.java:224)
    at org.thymeleaf.engine.Text.write(Text.java:78)
    at org.thymeleaf.engine.OutputTemplateHandler.handleText(OutputTemplateHandler.java:71)
    ... 107 more
Caused by: org.springframework.expression.spel.SpelEvaluationException: EL1007E: Property or field 'username' cannot be found on null
    at org.springframework.expression.spel.ast.PropertyOrFieldReference.readProperty(PropertyOrFieldReference.java:213)
    at org.springframework.expression.spel.ast.PropertyOrFieldReference.getValueInternal(PropertyOrFieldReference.java:104)
    at org.springframework.expression.spel.ast.PropertyOrFieldReference.access$000(PropertyOrFieldReference.java:51)

my home page

<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org"
      xmlns:sec="http://www.thymeleaf.org/thymeleaf-extras-springsecurity3">
    <head>
        <meta charset="ISO-8859-1">
        <title>Registration and Login App</title>

        <link rel="stylesheet"
              href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css"
              integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u"
              crossorigin="anonymous">

    </head>
    <body>
        <!-- create navigation bar ( header) -->
        <nav class="navbar navbar-inverse navbar-fixed-top">
            <div class="container">
                <div class="navbar-header">
                    <button type="button" class="navbar-toggle collapsed"
                            data-toggle="collapse" data-target="#navbar" aria-expanded="false"
                            aria-controls="navbar">
                        <span class="sr-only">Toggle navigation</span> <span
                            class="icon-bar"></span> <span class="icon-bar"></span> <span
                            class="icon-bar"></span>
                    </button>
                    <a class="navbar-brand" href="#" th:href="@{/}">Registration and
                        Login Module</a>
                </div>
                <div id="navbar" class="collapse navbar-collapse">
                    <ul class="nav navbar-nav">
                        <li sec:authorize="isAuthenticated()"><a th:href="@{/logout}">Logout</a></li>
                    </ul>
                </div>
            </div>
        </nav>

        <br>
        <br>

        <div class="container">
            <h1>Registration and Login with Spring Boot, Spring Security,
                Thymeleaf, Hibernate and MySQL</h1>
            Welcome <span sec:authentication="principal.username"> User</span>
        </div>
        <a th:href="login" id="changeMe" class="btn btn-danger">Delete</a>
        <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>

        <script  type="text/javascript" th:inline="javascript">
            let email=[[${principal.username}]];
            $('#changeMe').prop("href", "/delete?email="+email)
        </script>
    </body>
</html>

my repository url: https://github.com/jonathanIckovich/realtyKing.git

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你丑哭了我 2025-02-17 09:44:24

如果要在链接中放置一个参数，请使用以下内容：＆lt; a th：href =“@{/delete（email = $ {＃authentication.principal.username}）}”＆gt; ...＆lt ;/a＆gt;。 This will result in a uri like this: /[email protected]。
如果要替换一个路径变量 - @{/delete/{email}（email = $ {＃authentication.principal.username}）}。

但是，您面临的问题似乎更像是一个内部问题，它连接到principt为null（因此，错误消息） - 这可能会发生，因为您已登录了。您可能应该检查是否有一个原理（例如＃authentication.isauthenticationed（））围绕您要构建的链接。