PHP在html中操作select？

问题描述：

I am trying to manipulate my html select function through PHP. and I can't concatenate my PHP with html

What I am doing: When I select a drop down function it load the option of the selected field.

Problem: When I load the field the option that I chose get unselected.

what I am doing: So what I am doing is pass a If statement to check it is true or not.

This is my code:

$result.='    
<div class="form-group">
  <label class="col-sm-2 control-label">Expenses Type:</label>

    <div class="col-sm-4" >
      <select name="expenses" style="width:285px;" class="form-control" onchange="submit(this.value)"  >
        <option value="0" selected="selected">Select Type</option>
        <option value="3" '.if($expenses==3) {.' selected="selected" '.}.'>Other Expenses</option> /*this is the line of error*/
        <option value="4" >Salary</option>
      </select>
    </div>
</div>';

Someone tell me to use ternary expression but I don't know how.

我试图通过PHP操纵我的html选择功能。我不能用PHP连接我的PHP p>

我在做什么： strong>当我选择一个下拉功能时，它会加载所选字段的选项。

问题： strong>当我加载字段时，我选择的选项将被取消选中。 p>

我在做什么： strong>所以我正在做的是传递一个If语句 code>来检查它是否为真。 p>

这是我的代码： strong> p>

  $ result。='
＆lt; div class =“form  -group“＆gt; 
＆lt; label class =”col-sm-2 control-label“＆gt;费用类型：＆lt; / label＆gt; 
 
＆lt; div class =”col-sm-4“＆gt;  
＆lt; select name =“expenses”style =“width：285px;”  class =“form-control”onchange =“submit（this.value）”＆gt; 
＆lt; option value =“0”selected =“selected”＆gt;选择类型＆lt; / option＆gt; 
＆lt; option value =“  3“'。if（$ expenses == 3）{。'  selected =“selected”'。}。'＆gt;其他费用＆lt; / option＆gt;  / *这是错误行* / 
＆lt; option value =“4”＆gt; Salary＆lt; / option＆gt; 
＆lt; / select＆gt; 
＆lt; / div＆gt; 
＆lt; / div＆gt;'; \  n  code>  pre> 
 
 有人告诉我使用三元表达但我不知道如何。 p> 
  div>

答

Just try with:

$result .= ' ....

    <option value="3" ' . ($expenses==3 ? ' selected="selected" ' : '') . '>Other Expenses</option>

    ... ';

答

youshould change it to:

 <div class="form-group">
     <label class="col-sm-2 control-label">Expenses Type:</label>
     <div class="col-sm-4" >
      <select name="expenses" style="width:285px;" class="form-control" onchange="submit(this.value)"  >
        <option value="0" > Select Type</option>
        <option value="3" <?php if($expenses==3) echo 'selected="selected"' ?> >Other Expenses</option>  
        <option value="4" <?php if($expenses==4) echo 'selected="selected"' ?> >Salary</option>
      </select>
    </div>
 </div>

By default the first value is selected you dont have to use a check there because if none of the other is selected the first should be selected

Post as less as possible php in your html. i changed it to html instead of php and only on the places i want the actual check i use the php.

PHP在html中操作select？

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