IF语句不适用于jquery

  • Z时代
  • 2024-01-10
  • 分类：问答

你好，我需要帮助，这是我的代码，它总是去其他条件 如果值和文本匹配，我想要comapre下拉文本然后我想隐藏一些div：IF语句不适用于jquery

jQuery("#myid").on('change', function() { 
    if(jQuery('#myid').val() == 'Well, this is a dummy text') { 
     alert(" hello"); 
    } else { 
     alert("World"); 
    } 
}); 
<select name="testtype" id="myid" class="validate[required]" style="font-size:12px; font-family:arial"> 
       <option selected="selected" value="">-- Make your selection --</option> 
       <option id="first" value="Health, Safety and Environment Test for Operatives ">Health, Safety and Environment Test for Operatives </option> 
       <option value="Supervisory-English only">Supervisory-English only</option> 
       <option value="Health, Safety and Environment Test for Managers and Professionals -English only">Health, Safety and Environment Test for Managers and Professionals -English only</option> 
       <option value="Demolition-English only">Demolition-English only</option> 
       <option value="Highway Works-English only">Highway Works-English only</option> 
       <option value="Specialist Work at Hight-English only">Specialist Work at Hight-English only</option> 
       <option value="Lifts and Escalators-English only">Lifts and Escalators-English only</option> 
       <option value="Tunnelling-English only">Tunnelling-English only</option> 
       <option value="Heating, Ventilation Air Conditioning and Refrigeration (HAVCR)-English only">Heating, Ventilation Air Conditioning and Refrigeration (HAVCR)-English only</option> 
       <option value="Plumbing (JIB)-English only">Plumbing (JIB)-English only</option> 
      </select>

回答：

我想comapre从下拉列表中选择文本

它看起来像你想选择的选项不是值的文本匹配，那么就应该用.text()获取文本，而不是.val()那将回退RN值，选择应该是这样的：

jQuery('#myid option:selected').text()

代码：

jQuery("#myid").on('change', function() {  
    //if (jQuery('#myid option:selected').text() == ...){  
    //Or  
    if (jQuery(this).val() == 'Health, Safety and Environment Test for Operatives ') {  
    alert(" hello");  
    } else {  
    alert("World");  
    }  
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>  
<select name="testtype" id="myid" class="validate[required]" style="font-size:12px; font-family:arial">  
    <option selected="selected" value="">-- Make your selection --</option>  
    <option id="first" value="Health, Safety and Environment Test for Operatives ">Health, Safety and Environment Test for Operatives </option>  
    <option value="Supervisory-English only">Supervisory-English only</option>  
    <option value="Health, Safety and Environment Test for Managers and Professionals -English only">Health, Safety and Environment Test for Managers and Professionals -English only</option>  
    <option value="Demolition-English only">Demolition-English only</option>  
    <option value="Highway Works-English only">Highway Works-English only</option>  
    <option value="Specialist Work at Hight-English only">Specialist Work at Hight-English only</option>  
    <option value="Lifts and Escalators-English only">Lifts and Escalators-English only</option>  
    <option value="Tunnelling-English only">Tunnelling-English only</option>  
    <option value="Heating, Ventilation Air Conditioning and Refrigeration (HAVCR)-English only">Heating, Ventilation Air Conditioning and Refrigeration (HAVCR)-English only</option>  
    <option value="Plumbing (JIB)-English only">Plumbing (JIB)-English only</option>  
</select>

回答：

的错误是已分配的期权价值数点&你用它进行比对，它会在if声明中返回false。但

如果你.text()比较它从每一个选项 这是所有文本if语句

$("#myid").change(function(){  
    if($(this).val()=='Well,this is a dummy text') {  
    alert('hello');  
    }  
    else  
    alert("wolrd");  
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>  
<select id="myid">  
<option value="1">wolrd</option>  
<option value="2">hello</option>  
<option value="Well,this is a dummy text">Well,this is a dummy text</option>  
</select>

以上是 IF语句不适用于jquery 的全部内容， 来源链接： utcz.com/qa/263370.html

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