Ajax 请求 returns "mysqli_stmt_execute(): Property access is not allowed"

Question

我有一个输入表单，当输入某个公司的名称 (onkeyup) 时，颜色值取自 SQL 数据库。

HTML:

<form id="changeForm" action="includes/tri-inc.php" method="post" style="width: 205px;">
<input id="hiddenId" type="hidden" name="verseid" value="23">
<input id="hiddenArea" type="hidden" name="hiddenArea" value="detail">
<input name="kategorie" type="text" placeholder="Kategorie" value="GA/MSRL"><br>
<input name="firma" onkeyup="showColor(this.value)" type="text" placeholder="Firmenname" value=""><br>
<input id="color" name="color" type="color" value="#FF22FF"><br>
<input name="person" type="text" placeholder="Kontaktperson" value=""><br>
<input name="adresse" type="text" placeholder="Adresse" value=""><br>
<input name="email" type="text" placeholder="Email-Adresse" value=""><br>
<input name="telefon" type="text" placeholder="Telefonnummer" value=""><br>
<input type="submit" name="submit">
</form>

javascript:

    function showColor(str) {
    if (str.length == 0) {
        document.getElementById('color').value = "#808080";
        return;
    } else {
        const xmlhttp = new XMLHttpRequest();
        xmlhttp.onload = function() {
            document.getElementById("color").value = this.responseText;
        }
    xmlhttp.open("GET", "includes/getColor.php?c=" + encodeURIComponent(str));
    xmlhttp.send();
    }
}

PHP:

<?php
    $c =$_REQUEST["c"];
    require 'database.php';

    if ($c !== "") {
        $sql = "SELECT color FROM dreiecke WHERE firma = '" .urldecode($c). "'";
        $stmt = mysqli_stmt_init($conn);
        mysqli_stmt_execute($stmt);
        $result = mysqli_stmt_get_result($stmt);
        $result = $result[0];
        echo $result === null ? "#ff22ff" : $result;
    } else {
        echo "#ff22ff";
    }
?>

该命令未正确触发，returns 颜色输入字段的默认值 #000000。

控制台显示：“mysqli_stmt_execute(): 属性不允许访问”

我哪里错了？

Answer 1

感谢 Dharman 的评论，我设法弄明白了：

<?php
    $c =$_REQUEST["c"];
    require 'database.php';
    $defaultColor = "@808080";

    if ($c !== "") {
        $c = urldecode($c);
        $stmt = $conn->prepare("SELECT color FROM dreiecke WHERE firma=?");

        $stmt->bind_param("s", $c);

        $stmt->execute();

        $stmt->bind_result($result);
        $stmt->fetch();

        $result = substr($result, 0, 7);
        if ($result != null) {
            echo $result == null ? "#ffffff" : $result;
        } 
        return;
    } 
    echo $defaultColor;
?>

Ajax 请求 returns "mysqli_stmt_execute(): Property access is not allowed"

Ajax request returns "mysqli_stmt_execute(): Property access is not allowed"

php

mysql

forms

ajax

mysqli