【发布时间】:2020-06-20 02:04:57
【问题描述】:
我正在制作一个与 MediaWiki 相关的 JavaScript 解决方案,但它的用途并不是真正需要的信息,所以我将它留在那里。我有以下功能:
wgAjaxLicensePreview=true;
function getLicensePreview(num) {
console.log('glp num', num);
window.licenseSelectorCheck = function () {
var selector = document.getElementById("license" + num);
var selection = selector.options[selector.selectedIndex].value;
if (selector.selectedIndex > 0) {
if (selection == "") {
// Option disabled, but browser is broken and doesn't respect this
selector.selectedIndex = 0;
}
}
// We might show a preview
wgUploadLicenseObj.fetchPreview(selection);
};
var wpLicense = document.getElementById('license' + num);
console.log('glp wpLicense', wpLicense);
if (mw.config.get('wgAjaxLicensePreview') && wpLicense) {
// License selector check
wpLicense.onchange = licenseSelectorCheck;
// License selector table row
var wpLicenseRow = wpLicense.parentNode.parentNode;
var wpLicenseTbody = wpLicenseRow.parentNode;
var row = document.createElement('tr');
var td = document.createElement('td');
row.appendChild(td);
td = document.createElement('td');
td.id = 'mw-license-preview' + num;
row.appendChild(td);
wpLicenseTbody.insertBefore(row, wpLicenseRow.nextSibling);
console.log('glp row', row);
}
window.wgUploadLicenseObj = {
'responseCache': {
'': ''
},
'fetchPreview': function (license) {
if (!mw.config.get('wgAjaxLicensePreview'))
return;
for (cached in this.responseCache) {
console.log('glp fp responseCache', this.responseCache);
if (cached == license) {
this.showPreview(this.responseCache[license]);
return;
}
}
$('#license' + num).injectSpinner('license' + num);
var title = document.getElementById('imagename' + num).value;
if (!title)
title = 'File:Sample.jpg';
var url = mw.util.wikiScript('api')
+ '?action=parse&text={{' + encodeURIComponent(license) + '}}'
+ '&title=' + encodeURIComponent(title)
+ '&prop=text&pst&format=json';
var req = sajax_init_object();
req.onreadystatechange = function () {
if (req.readyState == 4 && req.status == 200) {
console.log('glp fp response', req.responseText);
wgUploadLicenseObj.processResult(eval('(' + req.responseText + ')'), license);
}
};
req.open('GET', url, true);
req.send('');
},
'processResult': function (result, license) {
$.removeSpinner('license' + num);
this.responseCache[license] = result['parse']['text']['*'];
console.log('glp pr result license', result, license);
this.showPreview(this.responseCache[license]);
},
'showPreview': function (preview) {
var previewPanel = document.getElementById('mw-license-preview' + num);
console.log('glp sp', previewPanel, preview, previewPanel.innerHTML == preview);
if (previewPanel.innerHTML != preview)
previewPanel.innerHTML = preview;
}
};
}
问题在于我的循环
var limit = this.max < this.fileCount ? this.max : this.fileCount;
console.log('glp', this.max, this.fileCount);
for (i = 1; i <= limit; i++) {
console.log('glp i', i);
getLicensePreview(i);
}
没有正确迭代其中的一部分,我已将问题缩小到wpLicense.onchange = licenseSelectorCheck;,它正在重写事件处理程序以仅检查最后一个 num。
【问题讨论】:
-
与问题无关:
selector.options[selector.selectedIndex].value;可以简化为selector.value -
您将函数分配给
window.licenseSelectorCheck有什么原因吗?每次调用该函数时,您都会重新分配该全局变量。 -
我仍在阅读并试图理解代码......
-
这些窗口变量无法工作...您每次都在循环中覆盖它们
-
大声笑,我什至不确定我是对的。随意发布您实际编码的内容。
标签: javascript jquery loops for-loop mediawiki