blocks|key|987470|text|document.form.p_id.length+...不是count()。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|987471|你真的应该给你的表单一个id|987472|<form+id="myform">|code-block|syntax|javascript|987473|然后使用以下命令引用它：|987474|var+theForm+=+document.getElementById("myform");|987475|然后引用这些元素，如：|987476|for(var+i+=+0;+i+<+theForm.p_id.length;+i%2B%2B){|987477|entityMap^0|0|P|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Z|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|10|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|11|8|@]|D|@]|E|$]]|$1|O|3|P|5|J|7|12|8|@]|D|@]|E|$K|L]]|$1|Q|3|R|5|6|7|13|8|@]|D|@]|E|$]]|$1|S|3|T|5|J|7|14|8|@]|D|@]|E|$K|L]]|$1|U|3|-4|5|6|7|15|8|@]|D|@]|E|$]]]|V|$]]

<p><code>document.form.p_id.length</code> ... not count().</p>

<p>You really should give your form an id</p>

<pre><code>&lt;form id="myform"&gt;
</code></pre>

<p>Then refer to it using:</p>

<pre><code>var theForm = document.getElementById("myform");
</code></pre>

<p>Then refer to the elements like:</p>

<pre><code>for(var i = 0; i &lt; theForm.p_id.length; i++){
</code></pre>


blocks|key|987526|text|试着这样做：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|987527|var+p_ids+=+document.forms[0].elements["p_id[]"];
alert(p_ids.length);
for+(var+i+=+0,+len+=+p_ids.length;+i+<+len;+i%2B%2B)+{
++alert(p_ids[i].value);
}|code-block|syntax|javascript|987528|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

<p>Try this something like this:</p>

<pre><code>var p_ids = document.forms[0].elements["p_id[]"];
alert(p_ids.length);
for (var i = 0, len = p_ids.length; i &lt; len; i++) {
  alert(p_ids[i].value);
}
</code></pre>


blocks|key|987587|text|下面是一些PHP和JavaScript演示代码，展示了一种在表单上创建索引字段(同名字段)，然后在JavaScript和PHP中处理它们的简单方法。字段必须同时具有"ID“名称和"NAME”名称。Javascript使用ID，PHP使用名称。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|987588|<?php
//+How+to+use+same+field+name+multiple+times+on+form
//+Process+these+fields+in+Javascript+and+PHP
//+Must+use+"ID"+in+Javascript+and+"NAME"+in+PHP+
echo+"<HTML>";
echo+"<HEAD>";
?>
<script+type="text/javascript">
function+TestForm(form)+{
//+Loop+through+the+HTML+form+field+(TheId)+that+is+returned+as+an+array.+
//+The+form+field+has+multiple+(n)+occurrences+on+the+form,+each+which+has+the+same+name.
//+This+results+in+the+return+of+an+array+of+elements+indexed+from+0+to+n-1.
//+Use+ID++in+Javascript
var+i+=+0;
document.write("<P>Javascript+responding+to+your+button+click:</P>");
for+(i=0;+i+<+form.TheId.length;+i%2B%2B)+{
++document.write(form.TheId[i].value);
++document.write("<br>");
}++
}
</script>
<?php
echo+"</HEAD>";
echo+"<BODY>";
$DQ+=+'"';++#+Constant+for+building+string+with+double+quotes+in+it.

if+(isset($_POST["MyButton"]))+{
++$TheNameArray+=+$_POST["TheName"];++#+Use+NAME+in+PHP
++echo+"<P>Here+are+the+names+you+submitted+to+server:</P>";
++for+($i+=+0;+$i+<3;+$i%2B%2B)+{+++
++++echo+$TheNameArray[$i]+.+"<BR>";
++}+
}
echo+"<P>Enter+names+and+submit+to+server+or+Javascript</P>";
echo+"<FORM+NAME=TstForm+METHOD=POST+ACTION="+;
echo+$DQ+.+"TestArrayFormToJavascript2.php"+.+$DQ+.+"OnReset="+.+$DQ+.+"return+allowreset(this)"+.+$DQ+.+">";
echo+"<FORM>";
echo+"<INPUT+ID+=+TheId+NAME="+.+$DQ+.+"TheName[]"+.+$DQ+.+"+VALUE="+.+$DQ+.+""+.+$DQ+.+">";
echo+"<INPUT+ID+=+TheId+NAME="+.+$DQ+.+"TheName[]"+.+$DQ+.+"+VALUE="+.+$DQ+.+""+.+$DQ+.+">";
echo+"<INPUT+ID+=+TheId+NAME="+.+$DQ+.+"TheName[]"+.+$DQ+.+"+VALUE="+.+$DQ+.+""+.+$DQ+.+">";
echo+"<P><INPUT+TYPE=submit+NAME=MyButton+VALUE="+.+$DQ+.+"Submit+to+server"++++.+$DQ+.+"></P>";
echo+"<P><BUTTON+onclick="+.+$DQ+.+"TestForm(this.form)"+.+$DQ+.+">Submit+to+Javascript</BUTTON></P>";+
echo+"</FORM>";
echo+"</BODY>";
echo+"</HTML>";|code-block|syntax|javascript|987589|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

<p>Here’s some PHP and JavaScript demonstration code that shows a simple way to create indexed fields on a form (fields that have the same name) and then process them in both JavaScript and PHP. The fields must have both "ID" names and "NAME" names. Javascript uses the ID and PHP uses the NAME.  </p>

<pre><code>&lt;?php
// How to use same field name multiple times on form
// Process these fields in Javascript and PHP
// Must use "ID" in Javascript and "NAME" in PHP 
echo "&lt;HTML&gt;";
echo "&lt;HEAD&gt;";
?&gt;
&lt;script type="text/javascript"&gt;
function TestForm(form) {
// Loop through the HTML form field (TheId) that is returned as an array. 
// The form field has multiple (n) occurrences on the form, each which has the same name.
// This results in the return of an array of elements indexed from 0 to n-1.
// Use ID  in Javascript
var i = 0;
document.write("&lt;P&gt;Javascript responding to your button click:&lt;/P&gt;");
for (i=0; i &lt; form.TheId.length; i++) {
  document.write(form.TheId[i].value);
  document.write("&lt;br&gt;");
}  
}
&lt;/script&gt;
&lt;?php
echo "&lt;/HEAD&gt;";
echo "&lt;BODY&gt;";
$DQ = '"';  # Constant for building string with double quotes in it.

if (isset($_POST["MyButton"])) {
  $TheNameArray = $_POST["TheName"];  # Use NAME in PHP
  echo "&lt;P&gt;Here are the names you submitted to server:&lt;/P&gt;";
  for ($i = 0; $i &lt;3; $i++) {   
    echo $TheNameArray[$i] . "&lt;BR&gt;";
  } 
}
echo "&lt;P&gt;Enter names and submit to server or Javascript&lt;/P&gt;";
echo "&lt;FORM NAME=TstForm METHOD=POST ACTION=" ;
echo $DQ . "TestArrayFormToJavascript2.php" . $DQ . "OnReset=" . $DQ . "return allowreset(this)" . $DQ . "&gt;";
echo "&lt;FORM&gt;";
echo "&lt;INPUT ID = TheId NAME=" . $DQ . "TheName[]" . $DQ . " VALUE=" . $DQ . "" . $DQ . "&gt;";
echo "&lt;INPUT ID = TheId NAME=" . $DQ . "TheName[]" . $DQ . " VALUE=" . $DQ . "" . $DQ . "&gt;";
echo "&lt;INPUT ID = TheId NAME=" . $DQ . "TheName[]" . $DQ . " VALUE=" . $DQ . "" . $DQ . "&gt;";
echo "&lt;P&gt;&lt;INPUT TYPE=submit NAME=MyButton VALUE=" . $DQ . "Submit to server"    . $DQ . "&gt;&lt;/P&gt;";
echo "&lt;P&gt;&lt;BUTTON onclick=" . $DQ . "TestForm(this.form)" . $DQ . "&gt;Submit to Javascript&lt;/BUTTON&gt;&lt;/P&gt;"; 
echo "&lt;/FORM&gt;";
echo "&lt;/BODY&gt;";
echo "&lt;/HTML&gt;";
</code></pre>


<p>This is a two part question.  Someone answered a similar question the other day (which also contained info about this type of array in PHP), but I cannot find it.</p>

<p>1.) First off, what is the correct terminology for an array created on the end of the name element of an input tag in a form?</p>

<pre><code>&lt;form&gt;

    &lt;input name="p_id[]" value="0"/&gt;
    &lt;input name="p_id[]" value="1"/&gt;
    &lt;input name="p_id[]" value="2"/&gt;

&lt;/form&gt;
</code></pre>

<p>2.) How do I get the information from that array with JavaScript? Specifically, I am right now just wanting to count the elements of the array.  Here is what I did but it isn't working.</p>

<pre><code>function form_check(){
    for(var i = 0; i &lt; count(document.form.p_id[]); i++){  //Error on this line

        if (document.form.p_name[i].value == ''){
            window.alert('Name Message');
            document.form.p_name[i].focus();
            break;
        }

        else{
            if (document.form.p_price[i].value == ''){
                window.alert('Price Message');
                document.form.p_price[i].focus();
                break;
            }

            else{
                update_confirmation();
            }
        }
    }
}
</code></pre>


HTML form input tag name element array with JavaScript

这是一个由两部分组成的问题。前几天有人回答了一个类似的问题(它也包含了PHP中这种类型的数组的信息)，但我找不到它。1.)首先，对于在表单中输入标记的name元素末尾创建的数组，正确的术语是什么？<form>    <input name="p_id[]" value="0"/>    <input name="p_i...

问使用JavaScript的HTML表单输入标记名元素数组
EN

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