如果选择了选项，则使用 Jquery 禁用提交按钮

Question

我有一个包含四个选择字段的简单表单。如果在任何表单字段上选择了“是”，则需要禁用提交按钮，并且应该会出现一个隐藏的 div。这是我的标记示例：

<form>
I have read the information on the product(s)<select name="field4"> <option value="Yes">Yes</option> <option value="No">No</option> </select>

Do you have any allergies to any ingredients in product(s)?
 <select name="field5"><option value="Yes">Yes</option> <option value="No">No</option> </select>

Are you pregnant?
 <select name="field6"> <option value="Yes">Yes</option> <option value="No">No</option> </select>

Have you ever used this type of product and had undesirable results?
 <select name="field7"> <option value="Yes">Yes</option> <option value="No">No</option> </select>

<input name="cmdSubmit" type="submit" value="Submit" />
</form>


<div style="display:none;">Hidden div only to appear if any of the four dropdowns are marked YES.</div>

感谢您对此的帮助。我是一个 jquery 新手，正在努力学习。

Answer 1

我不完全了解您构建表单的方式和您的要求的业务逻辑，但是...根据您在此处所说的内容进行操作。

1. 编写函数来检查所有选项，更改禁用/启用提交，显示/隐藏 div
2. 加载时调用函数
3. 每次选项值更改时调用函数检查所有选项

.

checkOptions();
$("select").change(checkOptions);

function checkOptions() {
  var yesFound = false;
  $("select").each(function(index, element) {
    if ( $(element).val() == "Yes" ) {
      yesFound = true;
    }
  });

  if (yesFound) {
    $("#hidden-div").show();
    $("input[type=Submit]").attr("disabled","disabled");
  } else {
    $("#hidden-div").hide();
    $("input[type=Submit]").removeAttr("disabled");
  };
}

略加修改的 HTML：

<form>
  <select name="field4"> 
    <option value="Yes">Yes</option>
    <option value="No">No</option>
  </select> I have read the information on the product(s)<br/>
  <select name="field5">
    <option value="Yes">Yes</option>
    <option value="No">No</option>
  </select> Do you have any allergies to any ingredients in product(s)?<br/>
  <select name="field6">
    <option value="Yes">Yes</option>
    <option value="No">No</option>
  </select> Are you pregnant?<br/>
  <select name="field7">
    <option value="Yes">Yes</option>
    <option value="No">No</option>
  </select> Have you ever used this type of product and had undesirable results?<br/>
  <br/>
  <input name="cmdSubmit" type="submit" value="Submit" />
</form>
<div id="hidden-div" style="display:none;">Hidden div only to appear if any of the four dropdowns are marked YES.</div>

示例网页：

http://mikegrace.s3.amazonaws.com/forums/stack-overflow/example-disable-submit-dynamically.html

加载中：

所有选项“否”，只有一个：

所有选项“是”：

Answer 2

给你所有的选择（下拉菜单）一个类“foo”。给“是”选项一个“是”类。 $("select.foo option.yes:selected").empty() 表示“没有选择标记为“是”的下拉选项”

所以

$("select.foo").change(function() {
   if(!$("select.foo option.yes:selected").empty()) {
      /* Do something here, maybe use BlockUI JS library */
   }
});

Answer 3

var selects = $('select').change(function(){ //on change of any select
    var hasYes = false;
    selects.each(function(){ // check all selects
        if($(this).val() == 'Yes') //for 'Yes'
            hasYes = true;
    });
    if(hasYes){ // show div disable submit
       $('input:submit').attr('disabled','disabled');
       $('div.hidden').show();
    }
    else{
        $('input:submit').removeAttr('disabled');
       $('div.hidden').hide(); // add class hidden to the div
    }
});

Answer 4

您可以将两个选择的类属性设置为类似“选择”的内容，如下所示：

<select name="field5" class="choices"...

<select name="field6" class="choices"...

然后做这样的事情：

$(function() {
  $(".choices").change(function() {
    var anyYeses = false;
    $(".choices").each(function() {
      if($(this).val() == "Yes") {
        anyYeses = true;
      }
    });
    if(anyYeses) {
      $("input[name=cmdSubmit]").attr('disabled', 'disabled'); //disables
    }
    else {
      $("input[name=cmdSubmit]").removeAttr('disabled'); //enables
    }
  });
});