本文介绍了将默认值放入 <input type=file....>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.现在您实际上可以在 2017 年使用 JavaScript 动态/编程地设置文件输入元素的值.
有关详细信息以及演示，请参阅此问题中的答案:如何以编程方式设置文件输入值(即:拖放文件时)?
我想更新一个表.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.但我无法加载 <input type=file....>.
代码如下:
<?phpsession_start();if(!isset($_SESSION['user'])){header("位置:index.php");出口();}包括(./include/dbc.php")；$a=$_REQUEST['apt'];$qry="select * from flats where app_name = '$a'";$result=mysql_query($qry) 或死(mysql_error());而($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 过渡//EN" "www.w3/TR/xhtml1/DTD/xhtml1-transitional.dtd"><form id="form1" action="details1.php?ar=<?php echo $a;?>&api=<?php echo $ai;?>"方法="post" enctype="multipart/form-data"><html xmlns="www.w3/1999/xhtml"><头><meta http-equiv="Content-Type" content="text/html; charset=utf-8"/><title>欢迎来到 Prime Properties</title><link rel="stylesheet" href="style.css" type="text/css"/></头><身体><div 类="容器"><div 类="标题"><div class="banner"><img src="../images/top.jpg" width="995" height="169"/></div><!--菜单开始--><?php include('include/menu.php');?></div><!--菜单结束--></div><div 类="主"><!--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 在这里--><div 类="对"><p> 输入您的凭据......</p><fieldset><p class="first"><label for="a_name" >公寓名称:</label><input type="text" name="a_name" id="a_name" value="<?php echo $an;?>"><br/></input></p><p><label for="b_name">生成器名称:</label><input type="text" name="b_name" id="b_name" value="<?php echo $bn;?>"><br/></input></p><p><label for="loc">位置:</label><选择名称="本地"><?php $qry1="从 loc_id='$lc' 的位置选择位置";$result1=mysql_query($qry1) 或死(mysql_error());而($res = mysql_fetch_array($result1)){$op=$res[0];}?><option value="<?php echo $lc?>"><?php echo $op;?></option><option value="1">Maligaon</option></select><br/></p><p><标签为=状态">状态:</label><选择名称="状态"><?php $qry1="select status from status where st_id='$st'";$result1=mysql_query($qry1) 或死(mysql_error());而($res = mysql_fetch_array($result1)){$sts=$res[0];}?><option value="<?php echo $st?>"><?php echo $sts;?></option><option value="1">进行中</option><option value="2">未来</option><option value="3">完成</option></select><br/></p><p><label for="no_flats">单位数量:</label><input type="text" name="no_flats" id="no_flats" value="<?php echo $nf;?>"><br/></input></p><p><label for="c_time">完成时间:</label><?php $ct1=explode(" ", $ct);?><选择名称="月"><option><?php echo $ct1[0];?></option><option>一月</option><option>二月</option><option>三月</option></选择><选择名称="年份"><option><?php echo $ct1[1];?></option><选项>2012</选项><选项>2013</选项><选项>2014</选项></选择></p><p><label for="m_pic">主图:</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">位置图:</label><td><img src="loc_images/<?php echo $lm?>"width="100" height="70"/></td><input type="file" name="photo"><br/></input></p><p 类="提交"><输入类型=隐藏"名称=检查"值=1"/><button type="submit" name="submit" >更新</button></p></fieldset></div><!--正文内容到此结束--></div></身体></html></表格>我该怎么办?
解决方案出于安全原因， 元素的值只能由用户更改.无法通过 JavaScript 或 HTML 更改值.
Note:
The answers & comments below reflect the state of legacy browsers in 2009. Now you can actually set the value of the file input element dynamically/programatically using JavaScript in 2017.
See the answer in this question for details as well as a demo:How to set file input value programatically (i.e.: when drag-dropping files)?
I want to update a table. Hence when user wants to update it the insert form appears where the default values appear in the input boxes. But i can't load in the <input type=file....>.
Here is the code:
<?php session_start(); if(!isset($_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" "www.w3/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="www.w3/1999/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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将默认值放入 <input type=file....>
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