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[英]Disable option values in one select dropdown depending on value selected in another
[英]Select option in one dropdown disable option in another?
我正在运行一个 Rails 应用程序,并希望根据上一个下拉列表中选择的内容禁用下拉列表中的选项
$(function() {
var segments = document.getElementById("add-segments").getElementsByClassName("item active");
var defaults = document.getElementById("segment-defaults").getElementsByTagName("option");
for (var i = 0; i < segments.length; i++){
(segments[i].val() == defaults[i].val()) ? defaults[i].disabled = true : defaults[i].disabled = false
}
});
<div id="segment-defaults-checkbox">
<p id="add-segments">
<%= label_tag :segments, 'Add Segments' %>
<%= select_tag :segments,
options_from_collection_for_select(@default_segments, 'id', 'name', @segments),
{ prompt: 'Select all that apply', multiple: true, class: 'selectize-no-add'} %>
</p>
<p id="segment-default">
<%= f.label :default_segment, 'Choose A Default Segment' %>
<%= f.select :default_segment,
options_from_collection_for_select(@default_segments, 'id', 'name'),
{ prompt: 'Select One' } %>
</p>
</div>
我不知道它的 rails 模板是如何工作的,但如果我没记错的话,也许下面的这段代码将帮助您解决问题。
您没有得到一些结果,这是因为您将 id 放在p
标签中,而不是select
标签中,是的,您可以将以下代码用于您的导轨:
<div id="segment-defaults-checkbox">
<p id="add-segments">
<%= label_tag :segments, 'Add Segments' %>
<%= select_tag :segments,
options_from_collection_for_select(@default_segments, 'id', 'name', @segments),
{ prompt: 'Select all that apply', multiple: true, class: 'selectize-no-add', id: 'select-tag'} %>
</p>
<p id="segment-default">
<%= f.label :default_segment, 'Choose A Default Segment' %>
<%= f.select :default_segment,
options_from_collection_for_select(@default_segments, 'id', 'name'),
{ prompt: 'Select One' }, id: 'select-default-segment' %>
</p>
</div>
之后,您可以使用这个普通的 javascript 代码来获得预期的结果:
const selectTagElement= document.getElementById('select-tag');
const selectDefaultSegmentElement= document.getElementById('select-default-segment');
selectTagElement.onchange = function() {
console.log('select tag value: ', this.value);
for(let i = 0; i < selectDefaultSegmentElement.children.length; i++) {
console.log('is disabled ', this.value === selectDefaultSegmentElement.children.item(i).value)
if (this.value === selectDefaultSegmentElement.children.item(i).value) {
selectDefaultSegmentElement.children.item(i).setAttribute('disabled', true);
} else {
selectDefaultSegmentElement.children.item(i).removeAttribute('disabled');
}
}
}
对于纯 html 和 vanilla javascript 中的示例,您可以查看以下代码并尝试一下:
const segmentationDefaultElement = document.getElementById('segment-defaults'); const addSegments = document.getElementById('add-segments'); addSegments.onchange = function() { for(let i = 0; i < segmentationDefaultElement.children.length; i++) { if (+event.target.value === i+1) { segmentationDefaultElement.children.item(i).setAttribute('disabled', true); } else { segmentationDefaultElement.children.item(i).removeAttribute('disabled'); } } }
<,DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width. initial-scale=1.0"> <title>Document</title> </head> <body> <select name="add-segments" id="add-segments"> <option value="1">1</option> <option value="2">2</option> <option value="3">3</option> <option value="4">4</option> <option value="5">5</option> </select> <select name="segment-defaults" id="segment-defaults"> <option value="1">One</option> <option value="2">Two</option> <option value="3">Three</option> <option value="4">Four</option> <option value="5">Five</option> </select> </body> </html>
我在下面为您分享了一个示例代码。
HTML
<select id="disability">
<option value="false">Set Enable</option>
<option value="true">Set Disable</option>
</select>
<select id="option">
<option value="option-1">Option 1</option>
<option value="option-2">Option 2</option>
</select>
JS
var disabilitySelect = document.getElementById('disability');
var optionSelect = document.getElementById('option');
disabilitySelect.onchange = function() {
if(this.value === 'true') {
optionSelect.setAttribute('disabled', true);
} else {
optionSelect.removeAttribute('disabled');
}
}
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