我需要从php调用javascript或jquery - I need to call a javascript or jquery from php

我需要刷新页面，并根据第一个下拉列表中选择的值填充第二个下拉列表。

在PHP中，我选择下拉值。它调用Javascript函数reloadproject（）并用当前值重新加载页面
然后我使用$_get获得项目id的值
重新加载后，我需要使用$_GET获得的项目id调用函数getblock（val），并填充我的第二个下拉列表

function reloadproject(val) {
window.location = 'market?id=' + val;
}
function getblock(val) {
$.ajax({
	type: "POST",
	url: "list_flat_view_dd.php",
	data: 'project_id=' + val,
	success: function(data) {
		$("#block-list").html(data);
	}
});
}
function getflat(val) {
$.ajax({
	type: "POST",
	url: "list_flat_view_dd.php",
	data: 'block_id=' + val,
	success: function(data) {
		$("#flat-list").html(data);
	}
});
}

<div class="col-sm-3">
<select name="project" style="width: 100%;" id="project-list" class="form-control select2" 
onChange="reloadproject(this.value);">
<option value="all">Select</option>
<?php while ( $project=m ysqli_fetch_array ( $results_project ) ) { ?>
<option value="<?php echo $project[" id "]; ?>"<?php if(isset($_GET[ 'id'])){if($project[ "id"]==$ filter_project_id){ ?>selected="selected"
	<?php }} ?>>
	<?php echo $project[ "name"]; ?>
</option>
  <?php } ?>
</select>
<?php if(isset($_GET[ 'id'])){ ?>
<input type="hidden" name="filter_project_id" id="filter_project_id" value="<?php echo $filter_project_id; ?>">
<?php } ?>
</div>
<div class="col-sm-3">
  <select name="block" style="width: 100%;" id="block-list" class="form-control select2" onChange="getflat(this.value);">
<option value="all">Select</option>
  </select>
</div>
<div class="col-sm-3">
  <select name="flat" style="width: 100%;" id="flat-list" class="form-control select2" onChange="">
<option value="all">Select</option>
  </select>
</div>

您是否尝试过使用"document ready"来调用"getblock"函数？：

PHP首先运行：打印文档中的代码，然后使用jQuery$（document）.ready（），您就知道文档已经打印好了，并且已经有了GET['id']值的隐藏输入：

<input type="hidden" name="filter_project_id" id="filter_project_id" value="<?php echo $filter_project_id; ?>">

还有你的脚本：

$(document).ready(function() {
    if ($('#filter_project_id').val().length) {
         getblock($('#filter_project_id').val());
    }
});

首先，dropbox重新加载页面，并使用$_GET启用另一个具有项目id的输入框，这将调用ajax和jquery函数来填充第二个dropbox，而无需重新加载。

        
      function reloadproject(val){
	  window.location='market?id='+val;
      }
	  $(function() {
	    if ($('#filter_project_id').val().length) {
	      var project_id = $("#filter_project_id").val();
	      if (project_id) {
	        $.ajax({
	          type: "POST",
	          url: "list_flat_view_dd.php",
	          data: 'project_id=' + project_id,
	          success: function(data) {
	            $("#block-list").html(data);
	          }
	        });
	      }
	    }
	  });

<div class="col-sm-3">
  <select name="project" style="width: 100%;" id="project-list" class="form-control select2" onChange="reloadproject(this.value);">
    <option value="all">Select</option>
    <?php while ( $project=m ysqli_fetch_array ( $results_project ) ) { ?>
    <option value="<?php echo $project[" id "]; ?>"<?php if(isset($_GET[ 'id'])){if($project[ "id"]==$ filter_project_id){ ?>selected="selected"
      <?php }} ?>>
      <?php echo $project[ "name"]; ?>
    </option>
    <?php } ?>
  </select>
</div>
<?php if(isset($_GET[ 'id'])){ ?>
<input type="hidden" name="filter_project_id" id="filter_project_id" value="<?php echo $filter_project_id; ?>">
<?php } ?>
<div class="col-sm-3">
  <select name="block" style="width: 100%;" id="block-list" class="form-control select2" onChange="getflat(this.value);">
    <option value="all">Select</option>
  </select>
</div>