當用戶選擇一個選項時打開另一個輸入文本

Question

我是一個新手，我有這個項目，如果列出的選項不在下拉列表中，用戶應該可以選擇自定義輸入。

HTML

<div class="form-group">
            <label  class="col-sm-2 col-form-label">Select Page Size</label>
            <select name = 'pageSelector' class="col-sm-3">   
                <option value ="">Select Page Size</option> 
                <option value ="84.1|118.9">A0</option> 
                <option value = "59.4|84.1">A1</option> 
                <option value = "7.4|10.5">A7</option> 
                <option value = "custom">Select Custom</option> 
            </select> 
        </div> 

PHP

if(isset($_POST["pageSelector"]))
{
    $result = $_POST['pageSelector'];
    if($result == "")
    {
        echo "<script>alert('Please select the Page')</script>";   
    }
    
    $result_explode = explode('|', $result);
    $width_page = $result_explode[0];
    $height_page = $result_explode[1];
    

    // Converting the string variables to integer
    $width_plate=(double)$width_plate;
    $height_plate=(double)$height_plate;
    $width_page=(double)$width_page;
    $height_page=(double)$height_page;


    // To calculate the number of pages that can be print with one selected plate
    $calculated_width = $width_plate/$width_page;
    $calculated_height = $height_plate/$height_page;
    $print_include = (int)$calculated_height*(int)$calculated_width;

    echo "<div class='h1'>Number of Prints in one plate ".$print_include." prints</div> ";

}

我想如果用戶選擇自定義選項，那么輸入文本應該出現在屏幕上。

Answer 1

如果用戶選擇了自定義選項，那么您可以給他一個輸入。

 let selectEl = document.getElementById('select-list'); selectEl.addEventListener('change', (e) => { if (e.target.value == 'custom') { document.getElementById('txt-custom').style.display = 'block'; } else { document.getElementById('txt-custom').style.display = 'none'; } });

 #txt-custom { display: none; }

 <select id="select-list"> <option value="">Select an option</option> <option value="1">Option 1</option> <option value="2">Option 2</option> <option value="custom">Custom</option> </select> <input type="text" id="txt-custom" name="custom-value" />

Answer 2

 var pageSelector = document.getElementById('pageSelector'); var customInput = document.getElementById('customInput'); pageSelector.addEventListener('change', function(){ if(this.value == "custom") { customInput.classList.remove('hide'); } else { customInput.classList.add('hide'); } })

 .hide { width: 0; height: 0; opacity: 0; }

 <div class="form-group"> <label class="col-sm-2 col-form-label">Select Page Size</label> <select name = 'pageSelector' class="col-sm-3 page" id="pageSelector"> <option value ="">Select Page Size</option> <option value ="84.1|118.9">A0</option> <option value = "59.4|84.1">A1</option> <option value = "7.4|10.5">A7</option> <option value = "custom">Select Custom</option> </select> <input type="text" class="hide" placeholder="Custom Selector" name="custom" id="customInput"> </div>

Answer 3

演示代碼：

首先，您應該輸入style="display:none"和 jQuery

 jQuery(document).ready(function() { jQuery("#selectId").change(function() { if (jQuery(this).val() === 'custom'){ jQuery('input[name=other_input]').show(); } else { jQuery('input[name=other_input]').hide(); } }); });

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script> <select name = 'pageSelector' class="col-sm-3" id="selectId" > <option value ="">Select Page Size</option> <option value ="84.1|118.9">A0</option> <option value = "59.4|84.1">A1</option> <option value = "7.4|10.5">A7</option> <option value = "custom">Select Custom</option> </select> <br><br><br> <input type="text" name="other_input" style="display:none" />

Answer 4

Angular Version

Angular CLI：13.0.3 節點：16.15.0 Package 管理器：npm 8.5.5

在.html文件中

   **<div class="col-md-6">
                  <label class="form-label">Attendence Type</label>
                  <select (change)="type($event)" class="form-select" aria-label="Default select example" >
                    <option selected value="P">Present</option>
                    <option value="A">Absent</option>
                    <option value="PL">Paid Leave</option>
                    <option value="UL">Unpaid Leave</option>
                  </select>
                </div>**

I want to Show this input after select paid leave

**<div *ngIf="plFlag" class="col-md-6">
              <label class="form-label">Leave Type</label>
              <select class="form-select" aria-label="Default select example">
                <option selected disabled>Leave Type</option>
                <option value="CL">Causel Leave</option>
                <option value="SL">Seek Leave</option>
              </select>
            </div>**

and in .ts File

 **type(event: any) {
    console.log(event.target.value);
    if (event.target.value == "PL") {
      this.plFlag = true;
    }
    else {
      this.plFlag = false;
    }
  }**