Javascript 如何突出显示UIWebView中字符串的第一次出现?
我使用下面的javascript代码查找UIWebView中出现的所有字符串: UIWebViewSearch.js:Javascript 如何突出显示UIWebView中字符串的第一次出现?,javascript,ios,iphone,swift,uiwebview,Javascript,Ios,Iphone,Swift,Uiwebview,我使用下面的javascript代码查找UIWebView中出现的所有字符串: UIWebViewSearch.js: var uiWebview_SearchResultCount = 0; /*! @method uiWebview_HighlightAllOccurencesOfStringForElement @abstract // helper function, recursively searches in elements and their child no
var uiWebview_SearchResultCount = 0;
/*!
@method uiWebview_HighlightAllOccurencesOfStringForElement
@abstract // helper function, recursively searches in elements and their child nodes
@discussion // helper function, recursively searches in elements and their child nodes
element - HTML elements
keyword - string to search
*/
function uiWebview_HighlightAllOccurencesOfStringForElement(element,keyword) {
if (element) {
if (element.nodeType == 3) { // Text node
var count = 0;
var elementTmp = element;
while (true) {
var value = elementTmp.nodeValue; // Search for keyword in text node
var idx = value.toLowerCase().indexOf(keyword);
if (idx < 0) break;
count++;
elementTmp = document.createTextNode(value.substr(idx+keyword.length));
}
uiWebview_SearchResultCount += count;
var index = uiWebview_SearchResultCount;
while (true) {
var value = element.nodeValue; // Search for keyword in text node
var idx = value.toLowerCase().indexOf(keyword);
if (idx < 0) break; // not found, abort
//we create a SPAN element for every parts of matched keywords
var span = document.createElement("span");
var text = document.createTextNode(value.substr(idx,keyword.length));
span.appendChild(text);
span.setAttribute("class","uiWebviewHighlight");
span.style.backgroundColor="yellow";
span.style.color="black";
index--;
span.setAttribute("id", "SEARCH WORD"+(index));
//span.setAttribute("id", "SEARCH WORD"+uiWebview_SearchResultCount);
//element.parentNode.setAttribute("id", "SEARCH WORD"+uiWebview_SearchResultCount);
//uiWebview_SearchResultCount++; // update the counter
text = document.createTextNode(value.substr(idx+keyword.length));
element.deleteData(idx, value.length - idx);
var next = element.nextSibling;
//alert(element.parentNode);
element.parentNode.insertBefore(span, next);
element.parentNode.insertBefore(text, next);
element = text;
}
} else if (element.nodeType == 1) { // Element node
if (element.style.display != "none" && element.nodeName.toLowerCase() != 'select') {
for (var i=element.childNodes.length-1; i>=0; i--) {
uiWebview_HighlightAllOccurencesOfStringForElement(element.childNodes[i],keyword);
}
}
}
}
}
// the main entry point to start the search
function uiWebview_HighlightAllOccurencesOfString(keyword) {
uiWebview_RemoveAllHighlights();
uiWebview_HighlightAllOccurencesOfStringForElement(document.body, keyword.toLowerCase());
}
// helper function, recursively removes the highlights in elements and their childs
function uiWebview_RemoveAllHighlightsForElement(element) {
if (element) {
if (element.nodeType == 1) {
if (element.getAttribute("class") == "uiWebviewHighlight") {
var text = element.removeChild(element.firstChild);
element.parentNode.insertBefore(text,element);
element.parentNode.removeChild(element);
return true;
} else {
var normalize = false;
for (var i=element.childNodes.length-1; i>=0; i--) {
if (uiWebview_RemoveAllHighlightsForElement(element.childNodes[i])) {
normalize = true;
}
}
if (normalize) {
element.normalize();
}
}
}
}
return false;
}
// the main entry point to remove the highlights
function uiWebview_RemoveAllHighlights() {
uiWebview_SearchResultCount = 0;
uiWebview_RemoveAllHighlightsForElement(document.body);
}
function uiWebview_ScrollTo(idx) {
var scrollTo = document.getElementById("SEARCH WORD" + idx);
if (scrollTo) scrollTo.scrollIntoView();
}
这将查找并高亮显示webview中所有出现的字符串,但我只希望高亮显示第一个出现的字符串。
例如,当我调用以下代码时:
highlightAllOccurencesOfString(str:"Hello")
“Hello”的所有实例都会在webview中突出显示:
Hello
Frank,Hello
Noah
但我想要这个结果:
你好
弗兰克,你好,诺亚
如何修改javascript代码以仅突出显示搜索字符串的第一次出现
更新:我尝试了下面JonLuca的答案,但没有突出显示任何内容
如果有任何帮助,我们将不胜感激。该函数的运行方式类似于一棵树,它会检查元素是否为文本节点,如果不是,它会在每个子元素上调用自己 您必须让调用者知道您找到了要突出显示的单个元素,然后离开
同样,通过它搜索的方式并不能保证你所考虑的是单词的“第一”出现将是文档体正文中的第一次出现。
在代码中,如果找到要突出显示的单词,则返回true,否则返回false。这将阻止它继续搜索。修改js,如下所示:function uiWebview_HighlightAllOccurencesOfStringForElement(element, keyword) {
if (element) {
if (element.nodeType == 3) { // Text node
var count = 0;
var elementTmp = element;
var value = elementTmp.nodeValue; // Search for keyword in text node
var idx = value.toLowerCase().indexOf(keyword);
if (idx < 0) {
return false;
}
count++;
elementTmp = document.createTextNode(value.substr(idx + keyword.length));
uiWebview_SearchResultCount += count;
var index = uiWebview_SearchResultCount;
var value = element.nodeValue; // Search for keyword in text node
var idx = value.toLowerCase().indexOf(keyword);
if (idx < 0) {
return false;
} // not found, abort
//we create a SPAN element for every parts of matched keywords
var span = document.createElement("span");
var text = document.createTextNode(value.substr(idx, keyword.length));
span.appendChild(text);
span.setAttribute("class", "uiWebviewHighlight");
span.style.backgroundColor = "yellow";
span.style.color = "black";
index--;
span.setAttribute("id", "SEARCH WORD" + (index));
//span.setAttribute("id", "SEARCH WORD"+uiWebview_SearchResultCount);
//element.parentNode.setAttribute("id", "SEARCH WORD"+uiWebview_SearchResultCount);
//uiWebview_SearchResultCount++; // update the counter
text = document.createTextNode(value.substr(idx + keyword.length));
element.deleteData(idx, value.length - idx);
var next = element.nextSibling;
//alert(element.parentNode);
element.parentNode.insertBefore(span, next);
element.parentNode.insertBefore(text, next);
element = text;
return true;
} else if (element.nodeType == 1) { // Element node
if (element.style.display != "none" && element.nodeName.toLowerCase() != 'select') {
for (var i = element.childNodes.length - 1; i >= 0; i--) {
if (uiWebview_HighlightAllOccurencesOfStringForElement(element.childNodes[i], keyword)) {
return true;
}
}
}
}
}
}
函数uiWebview\u HighlightAlloccurrencesofStringForElement(元素,关键字){
if(元素){
如果(element.nodeType==3){//Text节点
var计数=0;
var elementTmp=元素;
var value=elementTmp.nodeValue;//在文本节点中搜索关键字
var idx=value.toLowerCase().indexOf(关键字);
if(idx<0){
返回false;
}
计数++;
elementTmp=document.createTextNode(value.substr(idx+关键字.length));
uiWebview\u SearchResultCount+=计数;
var index=uiWebview\u搜索结果帐户;
var value=element.nodeValue;//在文本节点中搜索关键字
var idx=value.toLowerCase().indexOf(关键字);
if(idx<0){
返回false;
}//找不到,中止
//我们为匹配关键字的每个部分创建一个SPAN元素
var span=document.createElement(“span”);
var text=document.createTextNode(value.substr(idx,keyword.length));
span.appendChild(文本);
setAttribute(“类”、“uiWebviewHighlight”);
span.style.backgroundColor=“黄色”;
span.style.color=“黑色”;
索引--;
setAttribute(“id”,“搜索词”+(索引));
//span.setAttribute(“id”、“搜索词”+uiWebview\u SearchResultCount);
//元素.parentNode.setAttribute(“id”,“搜索词”+uiWebview\u SearchResultCount);
//uiWebview_SearchResultCount++;//更新计数器
text=document.createTextNode(value.substr(idx+关键字.length));
element.deleteData(idx,value.length-idx);
var next=element.nextSibling;
//警报(element.parentNode);
element.parentNode.insertBefore(span,next);
element.parentNode.insertBefore(文本,下一步);
元素=文本;
返回true;
}如果(element.nodeType==1){//element节点
if(element.style.display!=“无”&&element.nodeName.toLowerCase()!=“选择”){
对于(var i=element.childNodes.length-1;i>=0;i--){
if(uiWebview_HighlightAlloccurrencesoFStringForElement(element.childNodes[i],关键字)){
返回true;
}
}
}
}
}
}
这不能保证是正确的,也不能保证它涵盖了您的所有用例。然而,在第一次找到突出显示的单词时,我让它返回true。它应该停止执行,并且不突出显示任何其他单词
让我知道这是否有效-我现在没有能力测试它。谢谢,但不幸的是,您的代码不起作用。没有突出显示:(你现在可以测试吗?@JonLuca,我也在寻找解决方案。我尝试了你的代码,但没有效果。你能建议其他解决方案吗?
function uiWebview_HighlightAllOccurencesOfStringForElement(element, keyword) {
if (element) {
if (element.nodeType == 3) { // Text node
var count = 0;
var elementTmp = element;
var value = elementTmp.nodeValue; // Search for keyword in text node
var idx = value.toLowerCase().indexOf(keyword);
if (idx < 0) {
return false;
}
count++;
elementTmp = document.createTextNode(value.substr(idx + keyword.length));
uiWebview_SearchResultCount += count;
var index = uiWebview_SearchResultCount;
var value = element.nodeValue; // Search for keyword in text node
var idx = value.toLowerCase().indexOf(keyword);
if (idx < 0) {
return false;
} // not found, abort
//we create a SPAN element for every parts of matched keywords
var span = document.createElement("span");
var text = document.createTextNode(value.substr(idx, keyword.length));
span.appendChild(text);
span.setAttribute("class", "uiWebviewHighlight");
span.style.backgroundColor = "yellow";
span.style.color = "black";
index--;
span.setAttribute("id", "SEARCH WORD" + (index));
//span.setAttribute("id", "SEARCH WORD"+uiWebview_SearchResultCount);
//element.parentNode.setAttribute("id", "SEARCH WORD"+uiWebview_SearchResultCount);
//uiWebview_SearchResultCount++; // update the counter
text = document.createTextNode(value.substr(idx + keyword.length));
element.deleteData(idx, value.length - idx);
var next = element.nextSibling;
//alert(element.parentNode);
element.parentNode.insertBefore(span, next);
element.parentNode.insertBefore(text, next);
element = text;
return true;
} else if (element.nodeType == 1) { // Element node
if (element.style.display != "none" && element.nodeName.toLowerCase() != 'select') {
for (var i = element.childNodes.length - 1; i >= 0; i--) {
if (uiWebview_HighlightAllOccurencesOfStringForElement(element.childNodes[i], keyword)) {
return true;
}
}
}
}
}
}