PHP's default selection methods for some radio selections and check boxes (example)-PHP Tutorial-php.cn

PHP's default selection methods for some radio selections and check boxes (example)

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Release： 2023-03-07 09:48:01

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1. Implementation code for default selection of radio, checkbox and php select

1. Implementation of default selection of radio radio button

Code example:

<input type="radio" name="dishu" value="3" <?php if($myrow[dishu]==3) echo("checked");?>>空白
<input type="radio" name="dishu" value="1" <?php if($myrow[dishu]==1) echo("checked");?>>出让
<input type="radio" name="dishu" value="2" <?php if($myrow[dishu]==2) echo("checked");?>>划拨
<input type="radio" name="dishu" value="4" <?php if($myrow[dishu]==4) echo("checked");?>>集体

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2. The default selection of the checkbox checkbox is implemented

Code example:

<input name="fujia_jiaju" type="checkbox" value="jiaju" <?php if($myrow[fujia_jiaju]) echo("checked");?>>
</font></strong>家　具</td>
<td width="108" height="1"><strong><font color="#008080" face="楷体_GB2312">
<input
name="fujia_chuju" type="checkbox" value="chuju" <?php if($myrow[fujia_chuju]) echo("checked");?>>
</font></strong>厨　具</td>
<td width="96" height="1"><strong><font color="#008080" face="楷体_GB2312">
<input
name="fujia_woju" type="checkbox" value="woju" <?php if($myrow[fujia_woju]) echo("checked");?>>
</font></strong>卧　具</td>
<td width="99" height="1"><strong><font color="#008080" face="楷体_GB2312"><input
name="fujia_TV" type="checkbox" value="TV" <?php if($myrow[fujia_TV]) echo("checked");?>>
</font></strong>电视机

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The combined use of these form fields is suitable Modify some database records and keep the original records as they were when added!

3. Select default selected item

Code example:

<form name="FORM" method="post" action="" enctype="multipart/form-data">
<select name=&#39;aaa&#39; id=&#39;bbb&#39;>
<option value=&#39;&#39;>省份分类---</option><option value=&#39;内蒙古&#39;>内蒙古</option>
<option value=&#39;新疆&#39;>新疆</option><option value=&#39;云南&#39;>云南</option>
<option value=&#39;西藏&#39;>西藏</option><option value=&#39;甘肃&#39;>甘肃</option>
<option value=&#39;宁夏&#39;>宁夏</option><option value=&#39;青海&#39;>青海</option>
<option value=&#39;四川&#39;>四川</option><option value=&#39;广西&#39;>广西</option>
<option value=&#39;贵州&#39;>贵州</option><option value=&#39;海南&#39;>海南</option>
<option value=&#39;广东&#39;>广东</option><option value=&#39;湖南&#39;>湖南</option>
<option value=&#39;湖北&#39;>湖北</option><option value=&#39;福建&#39;>福建</option>
<option value=&#39;江西&#39;>江西</option><option value=&#39;浙江&#39;>浙江</option>
<option value=&#39;安徽&#39;>安徽</option><option value=&#39;江苏&#39;>江苏</option>
<option value=&#39;河南&#39;>河南</option><option value=&#39;陕西&#39;>陕西</option>
<option value=&#39;山东&#39;>山东</option><option value=&#39;河北&#39;>河北</option>
<option value=&#39;山西&#39;>山西</option><option value=&#39;黑龙江&#39;>黑龙江</option>
<option value=&#39;吉林&#39;>吉林</option><option value=&#39;辽宁&#39;>辽宁</option>
</select>
</form>
<script type="text/java script">
<!--
document.FORM.bbb.value = "山东";//FORM是表单名，atc_province是select标签ID，
山东是select默认选中项
//-->
</script>

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4. How to implement the default selection of php select

Code example:

<select name="wuyeleixing" size="1">
<option <?php if($myrow[wuyeleixing]==1) echo("selected");?> value="1">住宅</option>
<option <?php if($myrow[wuyeleixing]==2) echo("selected");?> value="2">办公室</option>
<option <?php if($myrow[wuyeleixing]==3) echo("selected");?> value="3">营业房</option>
<option <?php if($myrow[wuyeleixing]==4) echo("selected");?> value="4">厂房</option>
<option <?php if($myrow[wuyeleixing]==5) echo("selected");?> value="5">仓库</option>
<option <?php if($myrow[wuyeleixing]==6) echo("selected");?> value="6">地块</option>
<option <?php if($myrow[wuyeleixing]==7) echo("selected");?> value="7">综合楼</option>
<option <?php if($myrow[wuyeleixing]==8) echo("selected");?> value="8">农牧场</option>
<option <?php if($myrow[wuyeleixing]==9) echo("selected");?> value="9">商住楼</option>
<option <?php if($myrow[wuyeleixing]==10) echo("selected");?> value="10">宾馆酒楼</option>
<option <?php if($myrow[wuyeleixing]==11) echo("selected");?> value="11">校舍</option>
</select>

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2. How to set default selections for select tags, radio buttons, and check boxes

When modifying background information, the original information needs to be displayed, but if it is displayed in and , It's a bit cumbersome to show which one is selected!

If you do the following:

<input type="radio" name="status" value="0" checked="${advert.status==0?&#39;checked&#39;:&#39;&#39; }"/> />

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Because there will be checked in each radio, there will be a problem with the display!
At this time, you can use in jstl to make a judgment, and then display the rows. The disadvantage of this is that the amount of code is relatively large. If there are multiple such tags, it will be very cumbersome.

So, choose another method:

<input type="radio" name="status" value="0" <c:out value="${advert.status==0?&#39;checked&#39;:&#39;&#39; }"/> />

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This is both convenient and eliminates tedious judgments.

Summary:
1. As long as checked or selected appears in and , it will is selected, regardless of whether it is in the form of checked="checked".
2. Both the EL expression ${} and jstl can be displayed directly on the web page, but in some cases ${} cannot be recognized, so if you use to display, both When used interactively and combined, the effect is better.

3. js implements the default selection of radio and select

1. Radio default The selected js code, where <%=order.getType()%> is the background data.

Code example:

<script>
//radio默认选中
 function init(){
  var v = &#39;<%=order.getType()%>&#39;;
  var type = document.getElementsByName("orderType");
  for(var i = 0; i < type.length; i = i + 1){
  if(type[i].value == v){
  type[i].checked = "checked";
  return ;
  }
  }
 }
</script>

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2. Select the js code selected by default, where <%=order.getType()%> is the background data.

Code example:

<script>
//select默认选中
//by www.
function init(){
  var v = &#39;<%=c.getLevel()%>&#39;;
  var type = document.getElementById("level");
  for(i = 0;i<=type.options.length;i++){
if(type.options[i].value == v){
type.options[i].selected = &#39;selected&#39;;
}
}
 }
</script>

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3. Call example

<body onload="init();">

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