JavaScript - 将内容写入网页中的任何 DIV

Question

I'm trying to build this site dynamically using AJAX.我正在尝试使用 AJAX 动态构建此站点。 I load the contents for the "content" div from a SQL query, depending on the previouly pressed button.我从 SQL 查询加载“内容”div 的内容，具体取决于先前按下的按钮。 When I press the "Administrar" button, I want to add some buttons to this "adminButtonContainer", but the following error is displayed:当我按下“Administrar”按钮时，我想向这个“adminButtonContainer”添加一些按钮，但显示以下错误：

'Cannot read property 'innerHTML' of nullat XMLHttpRequest.ajaxResponse' '无法读取 nullat XMLHttpRequest.ajaxResponse 的属性'innerHTML''

In fact, I can only add new content to the "content" DIV.实际上，我只能在“内容”DIV 中添加新内容。 I've been reading something related to calling the JavaScript functions once every DIV has been loaded, but I can't get to understand it.我一直在阅读与在每个 DIV 加载后调用 JavaScript 函数相关的内容，但我无法理解它。 Also, I would like to accomplish it in an "elegant" way, if possible: not having to add tags in the and things like that.另外，如果可能的话，我想以“优雅”的方式完成它：不必在中添加标签之类的东西。

This is my index.html file, which I would like to keep simple:这是我的index.html文件，我想保持简单：

<!DOCTYPE HTML PUBLIC “-//W3C//DTD HTML 4.01 Transitional//EN” “http://www.w3.org/TR/html4/loose.dtd”>
<html>
<head>
    <title></title>
    <meta http-equiv="content-type" content="text/html; charset=utf-8" />
    <script type="text/javascript" src="funciones.js"></script>
    <link rel="stylesheet" type="text/css" href="styles.css">
</head>

<body onload="doAjaxQuery(1,1);">

    <!-- LEFT MENU -->
    <div class="leftMenu">

        <!-- GENERAL BUTTONS -->
        <div class="buttonContainer">
            <button id="inicio" onclick="buttonPressed(1,0);">Inicio</button>
            <button id="artistas" onclick="buttonPressed(2,0);">Artistas</button>
            <button id="albumes" onclick="buttonPressed(3,0);">Álbumes</button>
            <button id="temas" onclick="buttonPressed(4,0);">Temas</button>
            <button id="generos"  onclick="buttonPressed(5,0);">Géneros</button>
            <button id="plataformas" onclick="buttonPressed(6,0);">Plataformas</button>
        </div>

        <!-- ONLY-ADMIN BUTTONS -->
        <div class="adminButtonContainer">
            <button onclick="doAjaxQuery(101,1)">Administrar</button>
        </div>
    </div>

    <div id="content" class="content"></div>

</body>
</html>

And here is the JavaScript function that writes correctly into the "content" DIV, but throws an error in any other DIV:这是正确写入“内容”DIV 的 JavaScript 函数，但在任何其他 DIV 中抛出错误：

function ajaxResponse() {

    if (ajaxObject.readyState == 4) {

        if (ajaxObject.status == 200) {

            // JSON Decodification
            var jsonResponse = JSON.parse(ajaxObject.responseText);
            var contentDiv = document.getElementById("content");
            var leftMenuDiv = document.getElementById("leftMenu");
            var buttonsDiv = document.getElementById("buttonContainer");
            var adminButtonsDiv = document.getElementById("adminButtonContainer");

            // innerHTML works with contentDiv
            setNewTitle(jsonResponse.Title);
            contentDiv.innerHTML = "";
            contentDiv.innerHTML += jsonResponse.H1;
            contentDiv.innerHTML += jsonResponse.Body;


            // innerHTML won't work with adminButtonsDiv (or any other but contentDiv):
            // ERROR: 'Cannot read property 'innerHTML' of nullat XMLHttpRequest.ajaxResponse'
            for (let boton of jsonResponse.BotonesAdmin) {
                var bSeccion = boton[1];
                var bBoton  = boton[2];
                adminButtonsDiv.innerHTML += bBoton;
            }

        } else {
            document.write('There was an error. HTTP error code ' + ajaxObject.status.toString() + '.');
            return;
        }
    }
}

Answer 1

Solution 1解决方案1

ID is missing in this element <div class="adminButtonContainer">此元素中缺少ID <div class="adminButtonContainer">

to到

<div class="adminButtonContainer" id="adminButtonContainer">

Solution 2:解决方案2：

If you can't add ID then change this JS line to use getElementsByClassName如果您无法添加ID更改此 JS 行以使用getElementsByClassName

var adminButtonsDiv = document.getElementById("adminButtonContainer");

to到

var adminButtonsDiv = document.getElementsByClassName("adminButtonContainer")[0];

JavaScript - 将内容写入网页中的任何 DIV

问题描述

1 个解决方案

解决方案1
1 已采纳 2017-08-11 08:58:23

JavaScript - 将内容写入网页中的任何 DIV

问题描述

1 个解决方案

解决方案1 1 已采纳 2017-08-11 08:58:23

解决方案1
1 已采纳 2017-08-11 08:58:23