cannot set param element value attribute using javascript setAttribute
When appending param elements via createFragment the setAttribute javascript function does not set the "value" attribute. It is necessary to set the nodetext to add the this value attribute to the param element.
Second when using the latter method the generated html sets the "value" to the innerHTML. The resulting HTML when view by "Inspect" looks like this.
<param id="myID">myValue</param>
Note: [the element close text </param> is correctly displayed using Inspect but when using File->SavePageAs the ending text is not saved correctly. I have reported this in another Moz. question in FF Help.]
function setparamAttrs(parmID, parmVal) {
var gData = document.createDocumentFragment();
var newNode = document.createElement("param");
var textStr = document.createTextNode(parmVal);
newNode.appendChild(textStr);
newNode.setAttribute("id", parmID);
//newNode.setAttribute("value", parmVal); // this does not work
//newNode.setAttribute("innerHTML", parmVal); //this does not work
gData.appendChild(newNode); document.body.appendChild(gData);
}
I was, however, able to retrieve the "value" after it was appended using:
var val = document.getElementById("parm0").value);
getAttribute("value") does not work either.
Finally I added the param elements to my HTML as this; <param id="myID">myValue</param>. I then attempted to extract the value using document.getElementById("myID").innerHTML. No text was returned. When I examined the HTML document with Inspect my HTML param element was displayed as <param id="myID">myVal. The closing element text was missing the same as when I use SavePageAs that I previously reported.
被采纳的解决方案
Yes, that is the correct way to code this and it works for me with no problems.
定位到答案原位置 👍 0所有回复 (3)
You need to set the value attribute and not the innerHTML of a param if you want to inspect the value.
var val = document.getElementById("parm0").getAttribute("value");
function setparamAttrs(parmID, parmVal) {
var gData = document.createDocumentFragment();
var newNode = document.createElement("param");
newNode.setAttribute("id", parmID);
newNode.setAttribute("value", parmVal);
gData.appendChild(newNode);
document.body.appendChild(gData);
}
setparamAttrs("param0", "test")
alert(document.getElementById("parm0").getAttribute("value"));
The reason I was getting the innerHTML was due to the textNode being added. Whatever text is in the textNode becomes innerHTML. Once this was removed the dynamically added param element was displayed correctly and when I performed a SavePageAs the resulting HTML output was correct. Below is the working code. Please post after you confirm then I will mark as the chosen solution.
<html>
<body>
<h3>Param Fragment Demo</h3>
<param id='testParm' value='testValue'>
<script language="javascript">
// begin main
alert(document.getElementById("testParm").value);
var gData = document.createDocumentFragment();
var newNode = document.createElement("param");
//var textStr = document.createTextNode(".");
//newNode.appendChild(textStr);
newNode.setAttribute("value", "fragValue");
newNode.setAttribute("id", "fragParm");
gData.appendChild(newNode);
document.body.appendChild(gData);
alert(document.getElementById("fragParm").value);
// end main
</script>
</body>
</html>
由cor-el于修改
选择的解决方案
Yes, that is the correct way to code this and it works for me with no problems.