首页 \ 问答 \ 为什么调用DOMDocument会失败？(Why does this call to DOMDocument fail?)

为什么调用DOMDocument会失败？(Why does this call to DOMDocument fail?)

 在这个PHP脚本中，我从XML文件中获取信息以在HTML页面上创建元素。 如果我用SimpleXMLElement读取XML文件，那么我就能获得信息。 我想切换到使用xpath，以便更容易从嵌套节点获取信息。 但奇怪的是，创建DOMDocument的调用失败了。 这个$dom = new DOMDocument(); 退出PHP脚本而不返回任何错误，告诉我为什么会发生这种情况。  
 php脚本是通过页面中javascript的ajax调用的。  
 这是PHP脚本。  
<?php

function get_nodes() {
// load SimpleXML
/* $nodes = new SimpleXMLElement('communities.xml', null, true); */

$dom = new DOMDocument();  // The script fails here
$dom->load('communities.xml');

$dom->formatOutput = true; 
$dom->preserveWhiteSpace = true;

// get document element  

$xpath = new DOMXPath($dom);

$nodes = $xpath->query("//COMMUNITY"); 

$nnodes = sizeof($nodes);
echo "<script type='text/javascript'> alert('Got ".$nnodes." nodes'); </script>";

foreach($nodes as $node) // loop through 
{

        echo "<div id = '".$node['ID']."' class= 'comdiv ui-widget-content' style = 'top: ".$node->TOP."px; left: ".$node->LEFT."px; 

width: ".$node->WIDTH."px; height: ".$node->HEIGHT."px;'> \n";

        /* echo "<script> alert ('<div id = \'".$node['ID']."\' class= \'comdiv ui-widget-content\' style = \'top: ".$node->TOP."; left: 

".$node->LEFT."; width: ".$node->WIDTH."; height: ".$node->HEIGHT.";\'>') </script>";*/

        echo "   <p class = 'comhdr editableText ui-widget-header'>".$node->NAME."</p>\n";

        echo "   <a href='#' onClick=\"delete_div('".$node['ID']."');\">Delete</a>&nbsp;&nbsp;\n";
        echo "   <a href='#' onClick=\"add_url('".$node['ID']."');\">Add URL</a>&nbsp;&nbsp;\n";

        echo "</div> \n";

        echo "<script type='text/javascript'>\n";
        echo "  $('#".$node['ID']."').resizable();\n";
        echo "  $('#".$node['ID']."').draggable();\n";
        echo "  $('#".$node['ID']."').draggable('option', 'handle', '.comhdr');\n";
        echo "</script>\n";


        $nodeid = $node['ID'];

        /* $xurls = $xpath->query("//COMMUNITY[@ID='$nodeid']/URLS/URL");

        foreach($xurls as $xurl) {

           echo "a url";

        }*/

}
        echo "<script type='text/javascript'>\n";
        echo "  $('.editableText').editableText();\n";
        echo "</script>\n";

   return;
}

echo get_nodes();

?>
 
 这是调用脚本的页面上的位置。  
<body>

<div id="editdiv" class="comdiv ui-widget-content" style="position: absolute; top: 150px; left: 850px; width:350px; height:250px; border:1px solid grey;">
    <p id="heading" class="comhdr editableText ui-widget-header">Editable</p>
</div>

<script type="text/javascript">

 $(document).ready(function() {
               //define php info and make ajax call to recreate divs from XML data
               $.ajax({
                   url: "get_nodes.php",
                   type: "POST",
                   data: { },
                   cache: false,
                   success: function (response) {

                       if (response != '') 
                       {
                          $(document.body).append(response);

                       }
                   }
               });
 });

</script>

</body>
 
 还有其他的ajax调用，我可以用DOMDocument加载xml文件。 唯一的区别是这个ajax调用来自页面正文。 

In this PHP script I get information from an XML file to create elements on an HTML page. If I read the XML file with SimpleXMLElement then I am able to get the information. I want to switch to use xpath to make it easier to get information from nested nodes. But strangely enough the call to create a DOMDocument fails. This $dom = new DOMDocument(); exits out of the PHP script without returning any errors to tell me why this happens. 
The php script is called through ajax from javascript within the page. 
Here is the PHP script. 
<?php

function get_nodes() {
// load SimpleXML
/* $nodes = new SimpleXMLElement('communities.xml', null, true); */

$dom = new DOMDocument();  // The script fails here
$dom->load('communities.xml');

$dom->formatOutput = true; 
$dom->preserveWhiteSpace = true;

// get document element  

$xpath = new DOMXPath($dom);

$nodes = $xpath->query("//COMMUNITY"); 

$nnodes = sizeof($nodes);
echo "<script type='text/javascript'> alert('Got ".$nnodes." nodes'); </script>";

foreach($nodes as $node) // loop through 
{

        echo "<div id = '".$node['ID']."' class= 'comdiv ui-widget-content' style = 'top: ".$node->TOP."px; left: ".$node->LEFT."px; 

width: ".$node->WIDTH."px; height: ".$node->HEIGHT."px;'> \n";

        /* echo "<script> alert ('<div id = \'".$node['ID']."\' class= \'comdiv ui-widget-content\' style = \'top: ".$node->TOP."; left: 

".$node->LEFT."; width: ".$node->WIDTH."; height: ".$node->HEIGHT.";\'>') </script>";*/

        echo "   <p class = 'comhdr editableText ui-widget-header'>".$node->NAME."</p>\n";

        echo "   <a href='#' onClick=\"delete_div('".$node['ID']."');\">Delete</a>&nbsp;&nbsp;\n";
        echo "   <a href='#' onClick=\"add_url('".$node['ID']."');\">Add URL</a>&nbsp;&nbsp;\n";

        echo "</div> \n";

        echo "<script type='text/javascript'>\n";
        echo "  $('#".$node['ID']."').resizable();\n";
        echo "  $('#".$node['ID']."').draggable();\n";
        echo "  $('#".$node['ID']."').draggable('option', 'handle', '.comhdr');\n";
        echo "</script>\n";


        $nodeid = $node['ID'];

        /* $xurls = $xpath->query("//COMMUNITY[@ID='$nodeid']/URLS/URL");

        foreach($xurls as $xurl) {

           echo "a url";

        }*/

}
        echo "<script type='text/javascript'>\n";
        echo "  $('.editableText').editableText();\n";
        echo "</script>\n";

   return;
}

echo get_nodes();

?>
 
Here is the place on the page where the script is called. 
<body>

<div id="editdiv" class="comdiv ui-widget-content" style="position: absolute; top: 150px; left: 850px; width:350px; height:250px; border:1px solid grey;">
    <p id="heading" class="comhdr editableText ui-widget-header">Editable</p>
</div>

<script type="text/javascript">

 $(document).ready(function() {
               //define php info and make ajax call to recreate divs from XML data
               $.ajax({
                   url: "get_nodes.php",
                   type: "POST",
                   data: { },
                   cache: false,
                   success: function (response) {

                       if (response != '') 
                       {
                          $(document.body).append(response);

                       }
                   }
               });
 });

</script>

</body>
 
There are other ajax calls where I am able to load the xml file with DOMDocument. The only difference is that this ajax call is from the body of the page.

原文：https://stackoverflow.com/questions/7164907

更新时间：2023-08-26 06:08

最满意答案

 尝试这个：  
List<EquipmentRequest_Result> output = db
      .EquipmentRequest()
      .Select(x=> new EquipmentRequest_Result { EquipmentName = x.EquipmentName })
      .ToList()
 
 
 编辑：专门为这个问题的情况  
var model = new ViewModels()
            {
                ModelEquipmentRequestResult = db
                    .EquipmentRequest()
                    .Select(x=> new EquipmentRequest_Result { EquipmentName = x.EquipmentName })
                    .ToList(),
                ModeleEquipmentSpViewModel = new EquipmentSpViewModel()
            };
return View(model);

Try this: 
List<EquipmentRequest_Result> output = db
      .EquipmentRequest()
      .Select(x=> new EquipmentRequest_Result { EquipmentName = x.EquipmentName })
      .ToList()
 
 
EDIT: Specifically for this question's scenario 
var model = new ViewModels()
            {
                ModelEquipmentRequestResult = db
                    .EquipmentRequest()
                    .Select(x=> new EquipmentRequest_Result { EquipmentName = x.EquipmentName })
                    .ToList(),
                ModeleEquipmentSpViewModel = new EquipmentSpViewModel()
            };
return View(model);

为什么调用DOMDocument会失败？(Why does this call to DOMDocument fail?)

最满意答案

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