将默认值放在< input type = file ....>中 [英] Putting default value in <input type=file....>
本文介绍了将默认值放在< input type = file ....>中的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
注意：
答案&下面的评论反映了2009年旧版浏览器的状态。现在，您可以在2017年使用JavaScript动态/编程地设置文件输入元素的值。
查看答案此问题的详细信息以及演示：
如何以编程方式设置文件输入值（即：何时拖放文件）？
我想更新表格。因此，当用户想要更新它时，插入表单会出现在默认值出现在输入框中的位置。但我无法载入< input type = file ....> 。
这里是代码：
<？php
session_start（）;
if（！isset（$ _ SESSION ['user']））
{
header（Location：index.php）;
exit（）;
}
include（./ include / dbc.php）;
$ a = $ _ REQUEST ['apt'];
$ qry =select * from flats where app_name ='$ a';
$ result = mysql_query（$ qry）或die（mysql_error（））;
while（$ res = mysql_fetch_array（$ result））
{
$ ai = $ res [0];
$ an = $ res [1];
$ bn = $ res [2];
$ lc = $ res [3];
$ st = $ res [4];
$ nf = $ res [5];
$ ct = $ res [6];
$ mp = $ res [7];
$ lm = $ res [8];
}
？>
<！DOCTYPE html PUBLIC - // W3C // DTD XHTML 1.0 Transitional // ENhttp://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd\">
< form id =form1action =details1.php？ar =<？php echo $ a;？>& api =<？php echo $ ai;？> method =postenctype =multipart / form-data>
< html xmlns =http://www.w3.org/1999/xhtml>
< head>
< meta http-equiv =Content-Typecontent =text / html; charset = utf-8/>
< title> Welcome To Prime Properties< / title>
< link rel =stylesheethref =style.csstype =text / css/>
< / head>
< body>
< div class =container>
< div class =heading>
< div class =banner>< img src =../ images / top.jpgwidth =995height =169/>< / div>
<！ - 菜单开始 - >
< div>
<？php include（'include / menu.php'）;？>
< / div>
<！ - 菜单结束 - >
< / div>
< div class =main>
<！ - 左侧菜单开始 - >
< div class =left_menu>
<？php include（'include / lm.php'）;？>
< / div>
<！ - 左侧菜单结束 - >
< div class =divider>< / div>
<！ - body contant去这里 - >
< div class =right>
< p>
& nbsp;& nbsp;& nbsp;& nbsp;& nbsp;& nbsp; Enter Your Credentials ......< / p>
< fieldset>< p class =first>
< label for =a_name>公寓名称：< / label>
< input type =textname =a_nameid =a_namevalue =<？php echo $ an;？>>< br />< / input> < / p为H.
< p>
< label for =b_name>生成器名称：< / label>
< input type =textname =b_nameid =b_namevalue =<？php echo $ bn;？>>< br />< / input> < / p为H.
< p>
< label for =loc>位置：< / label>
< select name =loc>
<？php $ qry1 =从loc_id ='$ lc'的位置选择位置;
$ result1 = mysql_query（$ qry1）或死（mysql_error（））;
while（$ res = mysql_fetch_array（$ result1））{
$ op = $ res [0];
}？>
< option value =<？php echo $ lc？>><？php echo $ op;？>< / option>
< option value =1> Maligaon< / option>
< / select>< br />< / p>
< p>
< label for =status>状态：其中/标签>
< select name =status>
<？php $ qry1 =从状态中选择状态，其中st_id ='$ st';
$ result1 = mysql_query（$ qry1）或死（mysql_error（））;
while（$ res = mysql_fetch_array（$ result1））{
$ sts = $ res [0];
}？>
< option value =<？php echo $ st？>><？php echo $ sts;？>< / option>
< option value =1>正在进行< / option>
< option value =2>未来< / option>
< option value =3>已完成< / option>
< / select>< br />< / p>
< p>< label for =no_flats>单位数量：< / label>
< input type =textname =no_flatsid =no_flatsvalue =<？php echo $ nf;？>>< br />< / input> < / p为H.
< p>< label for =c_time>完成时间：< / label>
<？php $ ct1 = explode（，$ ct）;
？>
< select name =month>
< option><？php echo $ ct1 [0];？>< / option>
< option> January< / option>
< option> February< / option>
< option> March< / option>
< / select>
< select name =year>
< option><？php echo $ ct1 [1];？>< / option>
< option> 2012< / option>
< option> 2013< / option>
< option> 2014< / option>
< / select>
< / p>
< p>< label for =m_pic>主要图片：< / label>
< td>< img src =images /<？php echo $ mp？> width =100height =70/>< / td>
< input type =filename =photo>< br />< / input>< / p>
< p>< label for =l_map>位置地图：< / label>
< td>< img src =loc_images /<？php echo $ lm？> width =100height =70/>< / td>
< input type =filename =photo>< br />< / input>< / p>
< p class =submit>
< input type =hiddenname =checkvalue =1/>
< button type =submitname =submit> UPDATE< / button>< / p>
< / fieldset>< / div>
<！ - body contant在此结束 - >
< / div>
< / body>
< / html>
< / form>
我该怎么办？
解决方案
出于安全原因，< input type = file> 元素的值只能由用户更改。无法通过JavaScript或HTML更改值。
Note:
The answers & comments below reflect the state of legacy browsers in 2009. Now you can actually set the value of the file input element dynamically/programatically using JavaScript in 2017.
See the answer in this question for details as well as a demo:
How to set file input value programatically (i.e.: when drag-dropping files)?
I want to update a table. Hence when user wants to update it the insert form appears where the default values appear in the input boxes. But i can't load in the <input type=file....>.
Here is the code:
<?php
session_start();
if(!isset($_SESSION['user']))
{
header("Location:index.php");
exit();
}
include("./include/dbc.php");
$a=$_REQUEST['apt'];
$qry="select * from flats where app_name = '$a'";
$result=mysql_query($qry) or die(mysql_error());
while($res = mysql_fetch_array($result))
{
$ai=$res[0];
$an=$res[1];
$bn=$res[2];
$lc=$res[3];
$st=$res[4];
$nf=$res[5];
$ct=$res[6];
$mp=$res[7];
$lm=$res[8];
}
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<form id="form1" action="details1.php?ar=<?php echo $a;?>&api=<?php echo $ai;?>" method="post" enctype="multipart/form-data">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Welcome To Prime Properties</title>
<link rel="stylesheet" href="style.css" type="text/css"/>
</head>
<body>
<div class="container">
<div class="heading">
<div class="banner"><img src="../images/top.jpg" width="995" height="169" /></div>
<!--menu start-->
<div>
<?php include('include/menu.php');?>
</div>
<!--menu end-->
</div>
<div class="main">
<!--left menu start-->
<div class="left_menu">
<?php include('include/lm.php');?>
</div>
<!--left menu end-->
<div class="divider"></div>
<!--body contant goes here-->
<div class="right">
<p>
Enter Your Credentials......</p>
<fieldset><p class="first">
<label for="a_name" >Appartment Name:</label>
<input type="text" name="a_name" id="a_name" value="<?php echo $an;?>"><br/></input></p>
<p>
<label for="b_name">Builder Name:</label>
<input type="text" name="b_name" id="b_name" value="<?php echo $bn;?>"><br/></input></p>
<p>
<label for="loc">Location:</label>
<select name="loc">
<?php $qry1="select location from location where loc_id='$lc'";
$result1=mysql_query($qry1) or die(mysql_error());
while($res = mysql_fetch_array($result1)){
$op=$res[0];
}?>
<option value="<?php echo $lc?>"><?php echo $op;?></option>
<option value="1">Maligaon</option>
</select><br/></p>
<p>
<label for="status"> Status:</label>
<select name="status">
<?php $qry1="select status from status where st_id='$st'";
$result1=mysql_query($qry1) or die(mysql_error());
while($res = mysql_fetch_array($result1)){
$sts=$res[0];
}?>
<option value="<?php echo $st?>"><?php echo $sts;?></option>
<option value="1">Ongoing</option>
<option value="2">Future</option>
<option value="3">Completed</option>
</select><br/></p>
<p><label for="no_flats">No of Flats:</label>
<input type="text" name="no_flats" id="no_flats" value="<?php echo $nf;?>"><br/></input></p>
<p><label for="c_time">Completion Time:</label>
<?php $ct1=explode(" ", $ct);
?>
<select name="month">
<option><?php echo $ct1[0];?></option>
<option>January</option>
<option>February</option>
<option>March</option>
</select>
<select name="year">
<option><?php echo $ct1[1];?></option>
<option>2012</option>
<option>2013</option>
<option>2014</option>
</select>
</p>
<p><label for="m_pic">Main Picture:</label>
<td><img src="images/<?php echo $mp?>" width="100" height="70" /></td>
<input type="file" name="photo"><br/></input></p>
<p><label for="l_map">Location Map:</label>
<td><img src="loc_images/<?php echo $lm?>" width="100" height="70" /></td>
<input type="file" name="photo"><br/></input></p>
<p class="submit">
<input type="hidden" name="check" value="1"/>
<button type="submit" name="submit" >UPDATE</button></p>
</fieldset></div>
<!--body contant end here -->
</div>
</body>
</html>
</form>
What i should do?
解决方案
For security reasons, the value of a <input type=file> element can only be changed by a user. It's not possible to change the value through JavaScript or HTML.
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